android开发-指纹识别
在Android 6.0中google终于给Android系统加上了指纹识别的支持,这个功能在iPhone上早就已经实现了,并且在很多厂商的定制的ROM中也都自己内部实现这个功能了,这个功能来的有点晚啊。在google全新发布的nexus设备:nexus 5x和nexus 6p中都携带了一颗指纹识别芯片在设备的背面,如下图(图片来自网络):
指纹识别是在Android 6.0之后新增的功能,因此在使用的时候需要先判断用户手机的系统版本是否支持指纹识别。另外,实际开发场景中,使用指纹的主要场景有两种:
- 纯本地使用。即用户在本地完成指纹识别后,不需要将指纹的相关信息给后台。
- 与后台交互。用户在本地完成指纹识别后,需要将指纹相关的信息传给后台。
由于使用指纹识别功能需要一个加密对象(CryptoObject)该对象一般是由对称加密或者非对称加密获得。上述两种开发场景的实现大同小异,主要区别在于加密过程中密钥的创建和使用,一般来说,纯本地的使用指纹识别功能,只需要对称加密即可;而与后台交互则需要使用非对称加密:将私钥用于本地指纹识别,识别成功后将加密信息传给后台,后台开发人员用公钥解密,以获得用户信息。
下面先简单介绍一下对称加密和非对称加密的相关概念,然后对两种开发方式的实现分别进行讲解。
对称加密、非对称加密和签名
在正式使用指纹识别功能之前,有必要先了解一下对称加密和非对称加密的相关内容。
对称加密:所谓对称,就是采用这种加密方法的双方使用方式用同样的密钥进行加密和解密。密钥是控制加密及解密过程的指令。算法是一组规则,规定如何进行加密和解密。因此加密的安全性不仅取决于加密算法本身,密钥管理的安全性更是重要。因为加密和解密都使用同一个密钥,如何把密钥安全地传递到解密者手上就成了必须要解决的问题。
非对称加密:非对称加密算法需要两个密钥:公开密钥(publickey)和私有密钥(privatekey)。公开密钥与私有密钥是一对,如果用公开密钥对数据进行加密,只有用对应的私有密钥才能解密;如果用私有密钥对数据进行加密,那么只有用对应的公开密钥才能解密。因为加密和解密使用的是两个不同的密钥,所以这种算法叫作非对称加密算法。 非对称加密算法实现机密信息交换的基本过程是:甲方生成一对密钥并将其中的一把作为公用密钥向其它方公开;得到该公用密钥的乙方使用该密钥对机密信息进行加密后再发送给甲方;甲方再用自己保存的另一把专用密钥对加密后的信息进行解密。
签名:在信息的后面再加上一段内容,可以证明信息没有被修改过。一般是对信息做一个hash计算得到一个hash值,注意,这个过程是不可逆的,也就是说无法通过hash值得出原来的信息内容。在把信息发送出去时,把这个hash值加密后做为一个签名和信息一起发出去。
由以上内容可以了解到,对称加密和非对称加密的特点如下:
- 对称加密的优点是速度快,适合于本地数据和本地数据库的加密,安全性不如非对称加密。常见的对称加密算法有DES、3DES、AES、Blowfish、IDEA、RC5、RC6。
- 非对称加密的安全性比较高,适合对需要网络传输的数据进行加密,速度不如对称加密。非对称加密应用于SSH, HTTPS, TLS,电子证书,电子签名,电子身份证等等
指纹识别的对称加密实现
使用指纹识别的对称加密功能的主要流程如下:
- 使用 KeyGenerator 创建一个对称密钥,存放在 KeyStore 里。
- 设置
KeyGenParameterSpec.Builder.setUserAuthenticationRequired()
为true, - 使用创建好的对称密钥初始化一个Cipher对象,并用该对象调用
FingerprintManager.authenticate()
方法启动指纹传感器并开始监听。 - 重写
FingerprintManager.AuthenticationCallback
的几个回调方法,以处理指纹识别成功(onAuthenticationSucceeded()
)、失败(onAuthenticationFailed()
和onAuthenticationError()
)等情况。
创建密钥
创建密钥要涉及到两个类:KeyStore 和 KeyGenerator。
KeyStore 是用于存储、获取密钥(Key)的容器,获取 KeyStore的方法如下:
try {mKeyStore = KeyStore.getInstance("AndroidKeyStore");
} catch (KeyStoreException e) {throw new RuntimeException("Failed to get an instance of KeyStore", e);
}
而生成 Key,如果是对称加密,就需要 KeyGenerator 类。获取一个 KeyGenerator 对象比较简单,方法如下:
// 对称加密, 创建 KeyGenerator 对象
try {mKeyGenerator = KeyGenerator.getInstance(KeyProperties.KEY_ALGORITHM_AES, "AndroidKeyStore");
} catch (NoSuchAlgorithmException | NoSuchProviderException e) {throw new RuntimeException("Failed to get an instance of KeyGenerator", e);
}
获得 KeyGenerator 对象后,就可以生成一个 Key 了:
try {keyStore.load(null);KeyGenParameterSpec.Builder builder = new KeyGenParameterSpec.Builder(defaultKeyName,KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT).setBlockModes(KeyProperties.BLOCK_MODE_CBC).setUserAuthenticationRequired(true).setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_PKCS7);if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {builder.setInvalidatedByBiometricEnrollment(true);}keyGenerator.init(builder.build());keyGenerator.generateKey();
} catch (CertificateException | NoSuchAlgorithmException | IOException | InvalidAlgorithmParameterException e) {e.printStackTrace();
}
关于 KeyStrore 和 KeyGenerator 的相关介绍,推荐阅读:Android KeyStore + FingerprintManager 存储密码
创建并初始化 Cipher 对象
Cipher 对象是一个按照一定的加密规则,将数据进行加密后的一个对象。调用指纹识别功能需要使用到这个对象。创建 Cipher 对象很简单,如同下面代码那样:
Cipher defaultCipher;
try {defaultCipher = Cipher.getInstance(KeyProperties.KEY_ALGORITHM_AES + "/"+ KeyProperties.BLOCK_MODE_CBC + "/" + KeyProperties.ENCRYPTION_PADDING_PKCS7);
} catch (NoSuchAlgorithmException | NoSuchPaddingException e) {throw new RuntimeException("创建Cipher对象失败", e);
}
然后使用刚才创建好的密钥,初始化 Cipher 对象:
try {keyStore.load(null);SecretKey key = (SecretKey) keyStore.getKey(keyName, null);cipher.init(Cipher.ENCRYPT_MODE, key);return true;
} catch (IOException | NoSuchAlgorithmException | CertificateException | UnrecoverableKeyException | KeyStoreException | InvalidKeyException e) {throw new RuntimeException("初始化 cipher 失败", e);
}
使用指纹识别功能
真正到了使用指纹识别功能的时候,你会发现其实很简单,只是调用 FingerprintManager 类的的方法authenticate()而已,然后系统会有相应的回调反馈给我们,该方法如下:
public void authenticate(CryptoObject crypto, CancellationSignal cancel, int flags, AuthenticationCallback callback, Handler handler)
该方法的几个参数解释如下:
- 第一个参数是一个加密对象。还记得之前我们大费周章地创建和初始化的Cipher对象吗?这里的 CryptoObject 对象就是使用 Cipher 对象创建创建出来的:
new FingerprintManager.CryptoObject(cipher)
。 - 第二个参数是一个 CancellationSignal 对象,该对象提供了取消操作的能力。创建该对象也很简单,使用
new CancellationSignal()
就可以了。 - 第三个参数是一个标志,默认为0。
- 第四个参数是 AuthenticationCallback 对象,它本身是 FingerprintManager 类里面的一个抽象类。该类提供了指纹识别的几个回调方法,包括指纹识别成功、失败等。需要我们重写。
- 最后一个 Handler,可以用于处理回调事件,可以传null。
完成指纹识别后,还要记得将 AuthenticationCallback 关闭掉:
public void stopListening() {if (cancellationSignal != null) {selfCancelled = true;cancellationSignal.cancel();cancellationSignal = null;}
}
重写回调方法
调用了 authenticate()
方法后,系统就会启动指纹传感器,并开始扫描。这时候根据扫描结果,会通过FingerprintManager.AuthenticationCallback类返回几个回调方法:
// 成功
onAuthenticationSucceeded()
// 失败
onAuthenticationFaile()
// 错误
onAuthenticationError()
一般我们需要重写这几个方法,以实现我们的功能。关于onAuthenticationFaile()
和onAuthenticationError()
的区别,后面会讲到。
指纹识别的非对称加密实现
其实流程和上面的流程差不多:
- 使用 KeyPairGenerator 创建一个非对称密钥。
- 使用创建好的私钥进行签名,使用该签名创建一个加密对象,并将该对象作为
FingerprintManager.authenticate()
方法的一个参数,启动指纹传感器并开始监听。 - 重写
FingerprintManager.AuthenticationCallback
类的几个回调方法,以处理指纹识别成功(onAuthenticationSucceeded()
)、失败(onAuthenticationFailed()
和onAuthenticationError()
)等情况。
可以看见,指纹识别的非对称加密方式和对称加密方式的实现流程是差不多的,它们之间最明显的差别是在于密钥的生成与使用。
创建密钥
这里要使用 KeyPairGenerator 来创建一组非对称密钥,首先是获取 KeyPairGenerator 对象:
// 非对称加密,创建 KeyPairGenerator 对象
try {mKeyPairGenerator = KeyPairGenerator.getInstance(KeyProperties.KEY_ALGORITHM_EC, "AndroidKeyStore");
} catch (NoSuchAlgorithmException | NoSuchProviderException e) {throw new RuntimeException("Failed to get an instance of KeyPairGenerator", e);
}
得到了 KeyPairGenerator 对象后,就可以创建 KeyPair(密钥对)了:
try {// Set the alias of the entry in Android KeyStore where the key will appear// and the constrains (purposes) in the constructor of the BuildermKeyPairGenerator.initialize(new KeyGenParameterSpec.Builder(KEY_NAME,KeyProperties.PURPOSE_SIGN).setDigests(KeyProperties.DIGEST_SHA256).setAlgorithmParameterSpec(new ECGenParameterSpec("secp256r1"))// Require the user to authenticate with a fingerprint to authorize// every use of the private key.setUserAuthenticationRequired(true).build());mKeyPairGenerator.generateKeyPair();
} catch (InvalidAlgorithmParameterException e) {throw new RuntimeException(e);
}
签名
指纹识别的对称加密实现中使用了Cipher对象来创建CryptoObject对象,而在这里,我们将会使用私钥进行签名,用签名对象来创建CryptoObject对象:
// 使用私钥签名
try {mKeyStore.load(null);PrivateKey key = (PrivateKey) mKeyStore.getKey(KEY_NAME, null);mSignature.initSign(key);return true;
} catch (KeyPermanentlyInvalidatedException e) {return false;
} catch (KeyStoreException | CertificateException | UnrecoverableKeyException | IOException| NoSuchAlgorithmException | InvalidKeyException e) {throw new RuntimeException("Failed to init Cipher", e);
}
同样的,调用new FingerprintManager.CryptoObject(mSignature)
方法创建一个CryptoObject对象。
调用指纹识别方法
这里的使用方法和前面“指纹识别的对称加密实现”中的调用方法是一样的,都是调用FingerprintManager.authenticate()
方法。这里就不再叙述。
监听回调
监听回调也和之前的类似,唯一不同的是,我们在识别成功后需要和后台进行交互,也就是onAuthenticationSucceeded()
中处理的逻辑不一样。
实际应用中的注意事项
判断用户是否可以使用指纹识别功能
一般来说,为了增加安全性,要求用户在手机的“设置”中开启了密码锁屏功能。当然,使用指纹解锁的前提是至少录入了一个指纹。
// 如果没有设置密码锁屏,则不能使用指纹识别
if (!keyguardManager.isKeyguardSecure()) {Toast.makeText(this, "请在设置界面开启密码锁屏功能",Toast.LENGTH_LONG).show();
}
// 如果没有录入指纹,则不能使用指纹识别
if (!fingerprintManager.hasEnrolledFingerprints()) {Toast.makeText(this, "您还没有录入指纹, 请在设置界面录入至少一个指纹",Toast.LENGTH_LONG).show();
}
这里用到了两个类:KeyguardManager 和 FingerprintManager,前者是屏幕保护的相关类。后者是指纹识别的核心类。
关于指纹识别回调方法
前面说到AuthenticationCallback类里面的几个回调方法,其中有三个是我们开发中需要用到的:
onAuthenticationError()
onAuthenticationSucceeded()
onAuthenticationFailed()
关于这三个回调方法,有几点需要注意的:
当指纹识别失败后,会调用
onAuthenticationFailed()
方法,这时候指纹传感器并没有关闭,系统给我们提供了5次重试机会,也就是说,连续调用了5次onAuthenticationFailed()
方法后,会调用onAuthenticationError()
方法。当系统调用了
onAuthenticationError()
和onAuthenticationSucceeded()
后,传感器会关闭,只有我们重新授权,再次调用authenticate()
方法后才能继续使用指纹识别功能。当系统回调了
onAuthenticationError()
方法关闭传感器后,这种情况下再次调用authenticate()
会有一段时间的禁用期,也就是说这段时间里是无法再次使用指纹识别的。当然,具体的禁用时间由手机厂商的系统不同而有略微差别,有的是1分钟,有的是30秒等等。而且,由于手机厂商的系统区别,有些系统上调用了onAuthenticationError()
后,在禁用时间内,其他APP里面的指纹识别功能也无法使用,甚至系统的指纹解锁功能也无法使用。而有的系统上,在禁用时间内调用其他APP的指纹解锁功能,或者系统的指纹解锁功能,就能立即重置指纹识别功能。
示例代码
最后, Android Sample 里面关于指纹的示例代码地址如下:
对称加密方式:android-FingerprintDialog。
非对称加密方式:android-AsymmetricFingerprintDialog
以下内容更新于 2017.6.5
获取指纹信息
越来越多的朋友开始关心指纹识别这一功能模块,并且通过各种渠道向我咨询一些关于指纹识别的需求解决方案。这里就统一说明一下,就不一一回复了。
前面已经说到了,监听指纹识别成功之后会有一个 onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result)
回调方法。该方法会给我们一个 AuthenticationResult
类的对象 result
,该类的源码如下:
public static class AuthenticationResult {private Fingerprint mFingerprint;private CryptoObject mCryptoObject;/*** Authentication result** @param crypto the crypto object* @param fingerprint the recognized fingerprint data, if allowed.* @hide*/public AuthenticationResult(CryptoObject crypto, Fingerprint fingerprint) {mCryptoObject = crypto;mFingerprint = fingerprint;}/*** Obtain the crypto object associated with this transaction* @return crypto object provided to {@link FingerprintManager#authenticate(CryptoObject,* CancellationSignal, int, AuthenticationCallback, Handler)}.*/public CryptoObject getCryptoObject() { return mCryptoObject; }/*** Obtain the Fingerprint associated with this operation. Applications are strongly* discouraged from associating specific fingers with specific applications or operations.** @hide*/public Fingerprint getFingerprint() { return mFingerprint; }
};
这个类里面包含了一个 Fingerprint
对象,如果我们查看 Fingerprint
类的源码,可以得知该类提供了指纹的一些属性,包括指纹的名称、GroupId、FingerId 和 DeviceId 等属性。也就是说,通过 onAuthenticationSucceeded()
回调方法,我们可以得到识别的指纹的一些信息。
那为什么我们之前不使用该返回给我们的 AuthenticationResult
类对象 result
呢?因为我们没办法通过正常途径获取到这些信息。因为 mFingerprint
属性是私有的,getFingerprint()
方法是被 @hide
修饰的,甚至连存储指纹信息的 Fingerprint
类也是被 @hide
修饰的。
在 Android SDK 中,有两种 API 是我们无法直接获取的,一种是位于包 com.android.internal
下面的 API,另一种是被 @hide
修饰的类和方法。
然而,针对第二种被隐藏的 API,我们可以通过反射的方式来调用相关的类和方法。以 onAuthenticationSucceeded()
回调方法为例,看看如何获取识别成功的指纹信息:
@Override
public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {try {Field field = result.getClass().getDeclaredField("mFingerprint");field.setAccessible(true);Object fingerPrint = field.get(result);Class<?> clzz = Class.forName("android.hardware.fingerprint.Fingerprint");Method getName = clzz.getDeclaredMethod("getName");Method getFingerId = clzz.getDeclaredMethod("getFingerId");Method getGroupId = clzz.getDeclaredMethod("getGroupId");Method getDeviceId = clzz.getDeclaredMethod("getDeviceId");CharSequence name = (CharSequence) getName.invoke(fingerPrint);int fingerId = (int) getFingerId.invoke(fingerPrint);int groupId = (int) getGroupId.invoke(fingerPrint);long deviceId = (long) getDeviceId.invoke(fingerPrint);Log.d(TAG, "name: " + name);Log.d(TAG, "fingerId: " + fingerId);Log.d(TAG, "groupId: " + groupId);Log.d(TAG, "deviceId: " + deviceId);} catch (NoSuchFieldException | IllegalAccessException | ClassNotFoundException | NoSuchMethodException | InvocationTargetException e) {e.printStackTrace();}
}
显示的结果如下:
name:
fingerId: 1765296462
groupId: 0
deviceId: 547946660160
其中,返回的 name 为空字符串。
这里要提醒一点,由于每个手机厂商都会对 Android 系统进行或多或少的定制,因此在不同的手机上调用上面的方法得到的结果可能会不一样。比如在我的手机上,fingerId
是一个十位数的整数,在其他手机上面可能就是个一位数的整数。
得到了指纹信息之后,我们就可以做一些额外的功能了,比如监听用户是否使用同一个指纹来解锁,就可以用上面的方法来判断。
除了在 onAuthenticationSucceeded()
回调方法中获取被识别的指纹信息外,还可以利用 FingerprintManager
类的getEnrolledFingerprints()
方法来获取手机中存储的指纹列表:
public void getFingerprintInfo() {try {FingerprintManager fingerprintManager = (FingerprintManager) getSystemService(Context.FINGERPRINT_SERVICE);Method method = FingerprintManager.class.getDeclaredMethod("getEnrolledFingerprints");Object obj = method.invoke(fingerprintManager);if (obj != null) {Class<?> clazz = Class.forName("android.hardware.fingerprint.Fingerprint");Method getFingerId = clazz.getDeclaredMethod("getFingerId");for (int i = 0; i < ((List) obj).size(); i++) {Object item = ((List) obj).get(i);if (null == item) {continue;}Log.d(TAG, "fingerId: " + getFingerId.invoke(item));}}} catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | ClassNotFoundException e) {e.printStackTrace();}
}
在一些场景中,需要对用户手机里面录入的指纹进行监听,当用户手机里面的指纹列表发生了变化(比如用户删除了指纹或者新增了指纹),就需要用户重新输入密码,这时就可以用上面的方法,记录用户手机里面的指纹 ID,并进行前后对比。(当然,这种做法的安全系数并不高,也难以兼容众多设备,这里只是举例说明用途)
下面出一个指纹识别的demo app,并且详细说明怎么开发一个基于google api的指纹识别app。demo的源码在我的github上:
https://github.com/CreateChance/AndroidFingerPrintDemo
Android M中的指纹识别接口
动手开发一个指纹识别app
现在,我们要动手写一个利用上面接口的指纹识别app,这个app界面很简单,就一个activity,这个activity上会激活指纹识别,然后提示用户按下指纹,并且会将认证的结果显示出来。
开始
在开始之前,我们需要知道使用指纹识别硬件的基本步骤:
1.在AndroidManifest.xml中申明如下权限:
<code class="hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">uses-permission</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.permission.USE_FINGERPRINT"</span>/></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li></ul>
2.获得FingerprintManager的对象引用
3.在运行是检查设备指纹识别的兼容性,比如是否有指纹识别设备等。下面我们详细说一下上面的步骤:
申明权限
这一步比较简单,只要在AndroidManifest.xml中添加上面说到的权限就可以了。
获得FingerprintManager对象引用
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// Using the Android Support Library v4</span> fingerprintManager = FingerprintManagerCompat.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">from</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>); <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// Using API level 23:</span> fingerprintManager = (FingerprintManager)getSystemService(Context.FINGERPRINT_SERVICE);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
上面给出两种方式,第一种是通过V4支持包获得兼容的对象引用,这是google推行的做法;还有就是直接使用api 23 framework中的接口获得对象引用。
检查运行条件
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">if (!fingerprintManager<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.isHardwareDetected</span>()) { // no fingerprint sensor is detected, show dialog to tell user. AlertDialog<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Builder</span> builder = new AlertDialog<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Builder</span>(this)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setTitle</span>(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.string</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.no</span>_sensor_dialog_title)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setMessage</span>(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.string</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.no</span>_sensor_dialog_message)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setIcon</span>(android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.R</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawable</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.stat</span>_sys_warning)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setCancelable</span>(false)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setNegativeButton</span>(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.string</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.cancel</span>_btn_dialog, new DialogInterface<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.OnClickListener</span>() { @Override public void onClick(DialogInterface dialog, int which) { finish()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> } })<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> // show this dialog. builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.create</span>()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.show</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>
<code class="hljs coffeescript has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">KeyguardManager keyguardManager =(KeyguardManager)getSystemService(Context.KEYGUARD_SERVICE); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (keyguardManager.isKeyguardSecure()) { <span class="hljs-regexp" style="color: rgb(0, 136, 0); box-sizing: border-box;">//</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span> device <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">is</span> secure. }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>
<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">if (!fingerprintManager<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.hasEnrolledFingerprints</span>()) { // no fingerprint image has been enrolled. AlertDialog<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Builder</span> builder = new AlertDialog<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.Builder</span>(this)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setTitle</span>(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.string</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.no</span>_fingerprint_enrolled_dialog_title)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setMessage</span>(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.string</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.no</span>_fingerprint_enrolled_dialog_message)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setIcon</span>(android<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.R</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.drawable</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.stat</span>_sys_warning)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setCancelable</span>(false)<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.setNegativeButton</span>(R<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.string</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.cancel</span>_btn_dialog, new DialogInterface<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.OnClickListener</span>() { @Override public void onClick(DialogInterface dialog, int which) { finish()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> } })<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> // show this dialog builder<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.create</span>()<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.show</span>()<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span> }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li></ul>
<code class="hljs xml has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.FingerprintSettings"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.FingerprintEnrollOnboard"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.FingerprintEnrollFindSensor"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.FingerprintEnrollEnrolling"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.FingerprintEnrollFinish"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.FingerprintEnrollIntroduction"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span> /></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.SetupFingerprintEnrollOnboard"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.SetupFingerprintEnrollFindSensor"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.SetupFingerprintEnrollEnrolling"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.SetupFingerprintEnrollFinish"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"false"</span>/></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">".fingerprint.SetupFingerprintEnrollIntroduction"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:exported</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"true"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:permission</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.permission.MANAGE_FINGERPRINT"</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:theme</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"@style/SetupWizardDisableAppStartingTheme"</span>></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">intent-filter</span>></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">action</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.settings.FINGERPRINT_SETUP"</span> /></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"><<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">category</span> <span class="hljs-attribute" style="box-sizing: border-box; color: rgb(102, 0, 102);">android:name</span>=<span class="hljs-value" style="box-sizing: border-box; color: rgb(0, 136, 0);">"android.intent.category.DEFAULT"</span> /></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">intent-filter</span>></span> <span class="hljs-tag" style="color: rgb(0, 102, 102); box-sizing: border-box;"></<span class="hljs-title" style="box-sizing: border-box; color: rgb(0, 0, 136);">activity</span>></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li></ul>
一个好的app,应该在运行时都检查一下上面的条件,防止app出现意外的错误。
扫描用户按下的指纹
取消指纹扫描
创建CryptoObject类对象
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">CryptoObjectHelper</span> {</span> <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// This can be key name you want. Should be unique for the app.</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String KEY_NAME = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"com.createchance.android.sample.fingerprint_authentication_key"</span>; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// We always use this keystore on Android.</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String KEYSTORE_NAME = <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"AndroidKeyStore"</span>; <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// Should be no need to change these values.</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String KEY_ALGORITHM = KeyProperties.KEY_ALGORITHM_AES; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String BLOCK_MODE = KeyProperties.BLOCK_MODE_CBC; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String ENCRYPTION_PADDING = KeyProperties.ENCRYPTION_PADDING_PKCS7; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">static</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> String TRANSFORMATION = KEY_ALGORITHM + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"/"</span> + BLOCK_MODE + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"/"</span> + ENCRYPTION_PADDING; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">final</span> KeyStore _keystore; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-title" style="box-sizing: border-box;">CryptoObjectHelper</span>() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { _keystore = KeyStore.getInstance(KEYSTORE_NAME); _keystore.load(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> FingerprintManagerCompat.CryptoObject <span class="hljs-title" style="box-sizing: border-box;">buildCryptoObject</span>() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { Cipher cipher = createCipher(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> FingerprintManagerCompat.CryptoObject(cipher); } Cipher createCipher(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">boolean</span> retry) <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { Key key = GetKey(); Cipher cipher = Cipher.getInstance(TRANSFORMATION); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> { cipher.init(Cipher.ENCRYPT_MODE | Cipher.DECRYPT_MODE, key); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span>(KeyPermanentlyInvalidatedException e) { _keystore.deleteEntry(KEY_NAME); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(retry) { createCipher(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throw</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Exception(<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Could not create the cipher for fingerprint authentication."</span>, e); } } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> cipher; } Key GetKey() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { Key secretKey; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span>(!_keystore.isKeyEntry(KEY_NAME)) { CreateKey(); } secretKey = _keystore.getKey(KEY_NAME, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> secretKey; } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> CreateKey() <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">throws</span> Exception { KeyGenerator keyGen = KeyGenerator.getInstance(KEY_ALGORITHM, KEYSTORE_NAME); KeyGenParameterSpec keyGenSpec = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> KeyGenParameterSpec.Builder(KEY_NAME, KeyProperties.PURPOSE_ENCRYPT | KeyProperties.PURPOSE_DECRYPT) .setBlockModes(BLOCK_MODE) .setEncryptionPaddings(ENCRYPTION_PADDING) .setUserAuthenticationRequired(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>) .build(); keyGen.init(keyGenSpec); keyGen.generateKey(); } }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li><li style="box-sizing: border-box; padding: 0px 5px;">66</li><li style="box-sizing: border-box; padding: 0px 5px;">67</li><li style="box-sizing: border-box; padding: 0px 5px;">68</li><li style="box-sizing: border-box; padding: 0px 5px;">69</li><li style="box-sizing: border-box; padding: 0px 5px;">70</li><li style="box-sizing: border-box; padding: 0px 5px;">71</li><li style="box-sizing: border-box; padding: 0px 5px;">72</li><li style="box-sizing: border-box; padding: 0px 5px;">73</li><li style="box-sizing: border-box; padding: 0px 5px;">74</li><li style="box-sizing: border-box; padding: 0px 5px;">75</li></ul>
怎么使用CryptoObjectHelper呢?
下面我们看一下怎么使用CryptoObjectHelper这个类,我们直接看代码就知道了:
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">CryptoObjectHelper cryptoObjectHelper = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> CryptoObjectHelper(); fingerprintManager.authenticate(cryptoObjectHelper.buildCryptoObject(), <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, cancellationSignal, myAuthCallback, <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>);</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li></ul>
使用是比较简单的,首先new一个CryptoObjectHelper对象,然后调用buildCryptoObject方法就能得到CryptoObject对象了。
处理用户的指纹认证结果
<code class="hljs java has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">package</span> com.createchance.fingerprintdemo; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.os.Handler; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> android.support.v4.hardware.fingerprint.FingerprintManagerCompat; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> javax.crypto.BadPaddingException; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">import</span> javax.crypto.IllegalBlockSizeException; <span class="hljs-javadoc" style="color: rgb(136, 0, 0); box-sizing: border-box;">/** * Created by baniel on 7/21/16. */</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">class</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">MyAuthCallback</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">extends</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">FingerprintManagerCompat</span>.<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">AuthenticationCallback</span> {</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> Handler handler = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-title" style="box-sizing: border-box;">MyAuthCallback</span>(Handler handler) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>(); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">this</span>.handler = handler; } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onAuthenticationError</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> errMsgId, CharSequence errString) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onAuthenticationError(errMsgId, errString); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (handler != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) { handler.obtainMessage(MainActivity.MSG_AUTH_ERROR, errMsgId, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>).sendToTarget(); } } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onAuthenticationHelp</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> helpMsgId, CharSequence helpString) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onAuthenticationHelp(helpMsgId, helpString); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (handler != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) { handler.obtainMessage(MainActivity.MSG_AUTH_HELP, helpMsgId, <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>).sendToTarget(); } } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onAuthenticationSucceeded</span>(FingerprintManagerCompat.AuthenticationResult result) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onAuthenticationSucceeded(result); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">try</span> { result.getCryptoObject().getCipher().doFinal(); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (handler != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) { handler.obtainMessage(MainActivity.MSG_AUTH_SUCCESS).sendToTarget(); } } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (IllegalBlockSizeException e) { e.printStackTrace(); } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">catch</span> (BadPaddingException e) { e.printStackTrace(); } } <span class="hljs-annotation" style="color: rgb(155, 133, 157); box-sizing: border-box;">@Override</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">onAuthenticationFailed</span>() { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span>.onAuthenticationFailed(); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (handler != <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>) { handler.obtainMessage(MainActivity.MSG_AUTH_FAILED).sendToTarget(); } } }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li><li style="box-sizing: border-box; padding: 0px 5px;">57</li><li style="box-sizing: border-box; padding: 0px 5px;">58</li><li style="box-sizing: border-box; padding: 0px 5px;">59</li><li style="box-sizing: border-box; padding: 0px 5px;">60</li><li style="box-sizing: border-box; padding: 0px 5px;">61</li><li style="box-sizing: border-box; padding: 0px 5px;">62</li><li style="box-sizing: border-box; padding: 0px 5px;">63</li><li style="box-sizing: border-box; padding: 0px 5px;">64</li><li style="box-sizing: border-box; padding: 0px 5px;">65</li></ul>
这个子类实现很简单,主要的实现方式就是将消息抛给主界面的Handler来处理:
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;">handler = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">new</span> Handler() { @Override <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">public</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">handleMessage</span>(Message msg) { super.handleMessage(msg); Log.d(TAG, <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"msg: "</span> + msg.what + <span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">" ,arg1: "</span> + msg.arg1); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span> (msg.what) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> MSG_AUTH_SUCCESS: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.fingerprint_success); mCancelBtn.setEnabled(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>); mStartBtn.setEnabled(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>); cancellationSignal = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> MSG_AUTH_FAILED: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.fingerprint_not_recognized); mCancelBtn.setEnabled(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">false</span>); mStartBtn.setEnabled(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">true</span>); cancellationSignal = <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">null</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> MSG_AUTH_ERROR: handleErrorCode(msg.arg1); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> MSG_AUTH_HELP: handleHelpCode(msg.arg1); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; } } };</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li></ul>
这里分别处理四中回调,并且针对错误码调用handleErrorCode方法处理:
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">handleErrorCode</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> code) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span> (code) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ERROR_CANCELED: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.ErrorCanceled_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ERROR_HW_UNAVAILABLE: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.ErrorHwUnavailable_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ERROR_LOCKOUT: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.ErrorLockout_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ERROR_NO_SPACE: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.ErrorNoSpace_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ERROR_TIMEOUT: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.ErrorTimeout_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ERROR_UNABLE_TO_PROCESS: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.ErrorUnableToProcess_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; } }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul>
很简单,就是针对不同的错误码,设置界面上不同的显示文字,以提示用户。这里大家可以很据自己的需要修改逻辑。
针对帮助码调用handleHelpCode方法处理:
<code class="hljs cs has-numbering" style="display: block; padding: 0px; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-radius: 0px; word-wrap: normal; background: transparent;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">private</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span> <span class="hljs-title" style="box-sizing: border-box;">handleHelpCode</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> code) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">switch</span> (code) { <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ACQUIRED_GOOD: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.AcquiredGood_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ACQUIRED_IMAGER_DIRTY: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.AcquiredImageDirty_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ACQUIRED_INSUFFICIENT: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.AcquiredInsufficient_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ACQUIRED_PARTIAL: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.AcquiredPartial_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ACQUIRED_TOO_FAST: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.AcquiredTooFast_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">case</span> FingerprintManager.FINGERPRINT_ACQUIRED_TOO_SLOW: setResultInfo(R.<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">string</span>.AcquiredToSlow_warning); <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">break</span>; } }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right; background-color: rgb(238, 238, 238);"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li></ul>
总结
demo运行效果截图(运行于nexus 5x)
初始状态
扫描状态
扫描失败(出现可以恢复的错误,这里是手指移动太快)
认证失败
认证成功
android开发-指纹识别相关推荐
- Android开发 指纹识别
1.添加指纹识别权限: <uses-permission android:name="android.permission.USE_FINGERPRINT"/> 2.获 ...
- 中控指纹采集器开发指纹识别项目(说明)
历史指纹识别相关开发版本: 指纹识别开发1.0,开发时间:2018-01-04 指纹识别开发2.0,开发时间:2018-01-04 指纹识别开发3.0,开发时间:2020-01-06 可以从时间上看的 ...
- Android O指纹识别解析
版权声明:本文为梦想全栈程序猿原创文章,转载请附上原文出处链接和本声明 前面一片文章--Android Fingerprint完全解析(三) :Fingerprint Hal层分析 Android O ...
- android华为指纹识别开发,华为正在研发“全屏指纹识别+屏下摄像头”共存机型...
原标题:华为正在研发"全屏指纹识别+屏下摄像头"共存机型 信息显示9月1日中兴将全球首发屏幕下摄像头机型A20 5G,此前业内传言这项技术是华为首发.从现在看来是不可能了,一来中兴 ...
- Android中指纹识别的使用
/ 今日科技快讯 / 近日,微软斥资75亿美元收购了游戏发行商ZeniMax Media,后者旗下的游戏工作室曾推出<毁灭战士>以及<辐射>等知名游戏.这使得微软旗下的 ...
- Android 实现指纹识别demo
demo链接:https://download.csdn.net/download/meixi_android/10796468 1.指纹工具类: /*** 作者:created by meixi* ...
- 用android开发一个识别人形的app,一键切换背景
前言:我是小松,今年大四,在android开发中持续耕耘,快来一起学习把 不知道大家有没有这种烦恼,手上有白底的证件照,但是学校偏偏要交红底的,万般无奈只能去照相馆再照,虽说可以进行PS,但是总归麻烦 ...
- 简单实现 Android M 指纹识别(附源码)
众所周知, Android阵营里的指纹兼容真可谓是一团糟, 每个厂家几乎都有一套自己的API, 直到Android M的出现, 才慢慢地走上正途. 那么今天我们就一起来探讨一下, Android M里 ...
- Android随笔-指纹识别
Android指纹识别在Android 6.0以下是不支持的,Android 6.0使用FingerprintManager进行指纹识别,Android 9.0建议使用BiometricPrompt进 ...
最新文章
- 记一次 调节有音量界面 上移的bug
- Java Web整合开发(85)
- android位运算简单讲解
- SQL Server中各个系统表的作用
- 【合并区间】排序 + 双指针
- 什么是VGA光纤收发器?
- Nordic nRF52832程序下载问题分析
- 路由表,路由,路由规则_路由和路由表简介
- oracle的awr日志,oracle 导出awr信息
- Err:ClassNotFoundException: org.apache.tomcat.util.log.SystemLogHandler
- Java 完美判断中文字符的方法
- ORA-01438错误的解决方法
- 笔记本电脑黑屏但还在运作怎么办
- C++中方法的(值参数、ref、out、params)详解
- git提交提示workspace.xml出现conflicted
- 直接裁7000!任正非:我不要你觉得
- 学C语言和C++它有毛关系吗?
- 基于JavaEE的大学生公寓管理系统
- python在日常的一些用处
- 博学谷java百度网盘_博学谷javaee在线就业班2020网盘