# 前言

由于源码分析的代码量比较大，大部分博客网站的内容显示页面都比较窄，显示出来的效果都异常丑陋，所以您也可以直接查看《 Thinking in Android 》来阅读这边文章（也可以点击 RSS 订阅查看代码更方便），希望这篇文章能帮你梳理清楚“指纹注册流程”。

# 核心源码

关键类	路径
FingerprintEnrollIntroduction.java	packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollIntroduction.java
BiometricEnrollIntroduction.java	packages/apps/Settings/src/com/android/settings/biometrics/BiometricEnrollIntroduction.java
FingerprintEnrollEnrolling.java	packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollEnrolling.java
BiometricsEnrollEnrolling.java	packages/apps/Settings/src/com/android/settings/biometrics/BiometricsEnrollEnrolling.java
FingerprintEnrollSidecar.java	packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollSidecar.java
BiometricEnrollSidecar.java	packages/apps/Settings/src/com/android/settings/biometrics/BiometricEnrollSidecar.java
FingerprintEnrollFindSensor.java	packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollFindSensor.java
FingerprintManager.java	frameworks/base/core/java/android/hardware/fingerprint/FingerprintManager.java
FingerprintService.java	frameworks/base/services/core/java/com/android/server/biometrics/fingerprint/FingerprintService.java
BiometricServiceBase.java	frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.java
EnrollClient.java	frameworks/base/services/core/java/com/android/server/biometrics/EnrollClient.java

# 相关类

关键类	说明
BiometricEnrollBase	指纹录制的基类。
FingerprintEnrollFindSensor	指纹开始准备录入的 Activity，继承 `BiometricEnrollBase`。
FingerprintEnrollSidecar	注册 `EnrollmentCallback`，监听指纹录入状态，继承 `BiometricEnrollSidecar`。
FingerprintEnrollEnrolling	指纹录入过程的 Activity，继承 `BiometricEnrollBase` 类。
FingerprintEnrollFinish	指纹录制结束后调用的 Activity，继承 `BiometricEnrollBase` 类。
FingerprintRemoveSidecar	管理指纹删除操作。
FingerprintFindSensorAnimation	指纹动画接口。
FingerprintLocationAnimationView	指纹动画，实现了 `FingerprintFindSensorAnimation` 接口。

本篇文章，我们从源码角度探讨指纹录入的过程（测试样机：Pixel），我们先看下 UI 图，这个你应该不陌生了。

一、FingerprintEnrollIntroduction

接下来我们就从指纹引导界面开始源码分析，图 1 的逻辑就在 FingerprintEnrollIntroduction 类，点击 Next 执行下一步，会执行 onNextButtonClick() 方法。

1.1 FingerprintEnrollIntroduction.onNextButtonClick()

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollIntroduction.javapublic class FingerprintEnrollIntroduction extends BiometricEnrollIntroduction {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mFingerprintManager = Utils.getFingerprintManagerOrNull(this);mFooterBarMixin = getLayout().getMixin(FooterBarMixin.class);// Cancel ButtonmFooterBarMixin.setSecondaryButton(new FooterButton.Builder(this).setText(R.string.security_settings_face_enroll_introduction_cancel).setListener(this::onCancelButtonClick).setButtonType(FooterButton.ButtonType.SKIP).setTheme(R.style.SudGlifButton_Secondary).build());// Next ButtonmFooterBarMixin.setPrimaryButton(new FooterButton.Builder(this).setText(R.string.wizard_next).setListener(this::onNextButtonClick)    // 点击 "下一步" 的处理流程.setButtonType(FooterButton.ButtonType.NEXT).setTheme(R.style.SudGlifButton_Primary).build());}}

我们可以发现：FingerprintEnrollIntroduction 继承自 BiometricEnrollIntroduction，onNextButtonClick() 方法在其父类 BiometricEnrollIntroduction 中处理。

二、BiometricEnrollIntroduction

2.1 BiometricEnrollIntroduction.onNextButtonClick()

// packages/apps/Settings/src/com/android/settings/biometrics/BiometricEnrollIntroduction.javapublic abstract class BiometricEnrollIntroduction extends BiometricEnrollBaseimplements LinkSpan.OnClickListener {@Overrideprotected void onNextButtonClick(View view) {mNextClicked = true;if (checkMaxEnrolled() == 0) {// Lock thingy is already set up, launch directly to the next pagelaunchNextEnrollingActivity(mToken);    // 接下来就要拉起指纹录入界面} else {setResult(RESULT_FINISHED);finish();}}}

2.2 BiometricEnrollIntroduction.launchNextEnrollingActivity()

// packages/apps/Settings/src/com/android/settings/biometrics/BiometricEnrollIntroduction.javapublic abstract class BiometricEnrollIntroduction extends BiometricEnrollBaseimplements LinkSpan.OnClickListener {private void launchNextEnrollingActivity(byte[] token) {Intent intent = getEnrollingIntent();    // 获取 FingerprintEnrollFindSensorif (token != null) {intent.putExtra(ChooseLockSettingsHelper.EXTRA_KEY_CHALLENGE_TOKEN, token);}if (mUserId != UserHandle.USER_NULL) {intent.putExtra(Intent.EXTRA_USER_ID, mUserId);}intent.putExtra(EXTRA_FROM_SETTINGS_SUMMARY, mFromSettingsSummary);startActivityForResult(intent, BIOMETRIC_FIND_SENSOR_REQUEST);    // 跳转 FingerprintEnrollFindSensor}}

我们看下 getEnrollingIntent() 方法：

// packages/apps/Settings/src/com/android/settings/biometrics/BiometricEnrollIntroduction.javapublic abstract class BiometricEnrollIntroduction extends BiometricEnrollBaseimplements LinkSpan.OnClickListener {protected abstract Intent getEnrollingIntent();    // 抽象方法，由子类 FingerprintEnrollIntroduction 实现}

所以我们跳转到 FingerprintEnrollIntroduction：

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollIntroduction.javapublic class FingerprintEnrollIntroduction extends BiometricEnrollIntroduction {@Overrideprotected Intent getEnrollingIntent() {return new Intent(this, FingerprintEnrollFindSensor.class);    // 获取 FingerprintEnrollFindSensor}}

三、FingerprintEnrollFindSensor

我们把上面的图再拿过来，此时就进入了图 2 界面的逻辑，我们接着往下看。

3.1 FingerprintEnrollFindSensor.onCreate()

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollFindSensor.javapublic class FingerprintEnrollFindSensor extends BiometricEnrollBase {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(getContentView());mFooterBarMixin = getLayout().getMixin(FooterBarMixin.class);// Skip buttonmFooterBarMixin.setSecondaryButton(new FooterButton.Builder(this).setText(R.string.skip_label).setListener(this::onSkipButtonClick).setButtonType(FooterButton.ButtonType.SKIP).setTheme(R.style.SudGlifButton_Secondary).build());// Touch the sensorsetHeaderText(R.string.security_settings_fingerprint_enroll_find_sensor_title);// 执行 startLookingForFingerprint() 方法startLookingForFingerprint(); // already confirmed, so start looking for fingerprint// 演示动画View animationView = findViewById(R.id.fingerprint_sensor_location_animation);if (animationView instanceof FingerprintFindSensorAnimation) {mAnimation = (FingerprintFindSensorAnimation) animationView;} else {mAnimation = null;}}}

到这里都只是涉及到 UI 界面的相关逻辑，接下来的代码逻辑就稍微复杂一点了，我们仔细深挖研究。

3.2 FingerprintEnrollFindSensor.startLookingForFingerprint()

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollFindSensor.javapublic class FingerprintEnrollFindSensor extends BiometricEnrollBase {private FingerprintEnrollSidecar mSidecar;private boolean mNextClicked;private void startLookingForFingerprint() {// FingerprintEnrollSidecar 这个 fragment 的生命周期正式开启mSidecar = (FingerprintEnrollSidecar) getSupportFragmentManager().findFragmentByTag(FingerprintEnrollEnrolling.TAG_SIDECAR);if (mSidecar == null) {mSidecar = new FingerprintEnrollSidecar();// 添加 FingerprintEnrollEnrollinggetSupportFragmentManager().beginTransaction().add(mSidecar, FingerprintEnrollEnrolling.TAG_SIDECAR).commitAllowingStateLoss();}// FingerprintEnrollEnrolling 实现了 BiometricEnrollSidecar.Listener 接口mSidecar.setListener(new Listener() {    // 匿名内部类的方式实现接口方法@Overridepublic void onEnrollmentProgressChange(int steps, int remaining) {mNextClicked = true;proceedToEnrolling(true /* cancelEnrollment */);}@Overridepublic void onEnrollmentHelp(int helpMsgId, CharSequence helpString) {}@Overridepublic void onEnrollmentError(int errMsgId, CharSequence errString) {if (mNextClicked && errMsgId == FingerprintManager.FINGERPRINT_ERROR_CANCELED) {mNextClicked = false;proceedToEnrolling(false /* cancelEnrollment */);}}});}}

这里面有个重点方法：onEnrollmentProgressChange()，如果我们此时用手指贴在指纹传感器上，会产生反馈信息的回调，此时 onEnrollmentProgressChange() 方法被执行，进入执行 proceedToEnrolling() 方法，我们看下这个方法：

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollFindSensor.javapublic class FingerprintEnrollFindSensor extends BiometricEnrollBase {private void proceedToEnrolling(boolean cancelEnrollment) {if (mSidecar != null) {if (cancelEnrollment) {if (mSidecar.cancelEnrollment()) {// Enrollment cancel requested. When the cancellation is successful,// onEnrollmentError will be called with FINGERPRINT_ERROR_CANCELED, calling// this again.return;}}getSupportFragmentManager().beginTransaction().remove(mSidecar).commitAllowingStateLoss();mSidecar = null;// getFingerprintEnrollingIntent() 方法会返回一个包含 FingerprintEnrollEnrolling 的 IntentstartActivityForResult(getFingerprintEnrollingIntent(), ENROLL_REQUEST);}}}

正常流程会走到 startActivityForResult() 方法，跳转到 FingerprintEnrollEnrolling 界面。

四、FingerprintEnrollEnrolling

我们把上面的图再拿过来，此时就进入了图 3 界面的逻辑，我们接着往下看。

4.1 FingerprintEnrollEnrolling.onStart()

我们重点关注 onStart() 方法：

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollEnrolling.java/*** Activity which handles the actual enrolling for fingerprint.*/
public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {@Overrideprotected void onStart() {super.onStart();    // 调用父类 BiometricEnrollSidecar 的 onStart() 方法updateProgress(false /* animate */);    // 更新录入进度updateDescription();if (mRestoring) {startIconAnimation();}}}

FingerprintEnrollEnrolling 类继承自 BiometricsEnrollEnrolling 类，而 BiometricsEnrollEnrolling 类实现了 BiometricEnrollSidecar.Listener 接口，所以 FingerprintEnrollEnrolling 也实现了 BiometricEnrollSidecar.Listener 接口。

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollEnrolling.java/*** Activity which handles the actual enrolling for fingerprint.*/
public class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {// 指纹录制时提示（比如太快，移动手指之类）@Overridepublic void onEnrollmentHelp(int helpMsgId, CharSequence helpString) {if (!TextUtils.isEmpty(helpString)) {mErrorText.removeCallbacks(mTouchAgainRunnable);showError(helpString);}}// 提示指纹录制过程中超时，或者未注册@Overridepublic void onEnrollmentError(int errMsgId, CharSequence errString) {int msgId;switch (errMsgId) {case FingerprintManager.FINGERPRINT_ERROR_TIMEOUT:msgId = R.string.security_settings_fingerprint_enroll_error_timeout_dialog_message;break;default:msgId = R.string.security_settings_fingerprint_enroll_error_generic_dialog_message;break;}showErrorDialog(getText(msgId), errMsgId);stopIconAnimation();mErrorText.removeCallbacks(mTouchAgainRunnable);}// 录制过程中进度的变化（手指按压指纹传感区，onEnrollmentProgressChange() 会被触发，执行一系列处理工作）@Overridepublic void onEnrollmentProgressChange(int steps, int remaining) {updateProgress(true /* animate */);    // 更新进度updateDescription();    // 更新描述clearError();animateFlash();    // 更新动画mErrorText.removeCallbacks(mTouchAgainRunnable);mErrorText.postDelayed(mTouchAgainRunnable, HINT_TIMEOUT_DURATION);}}

五、BiometricsEnrollEnrolling

5.1 BiometricsEnrollEnrolling.onStart()

// packages/apps/Settings/src/com/android/settings/biometrics/BiometricsEnrollEnrolling.javapublic abstract class BiometricsEnrollEnrolling extends BiometricEnrollBaseimplements BiometricEnrollSidecar.Listener {@Overrideprotected void onStart() {super.onStart();if (shouldStartAutomatically()) {    // 恒定为 truestartEnrollment();    // 调用 startEnrollment() 方法}}}

5.2 BiometricsEnrollEnrolling.startEnrollment()

// packages/apps/Settings/src/com/android/settings/biometrics/BiometricsEnrollEnrolling.javapublic abstract class BiometricsEnrollEnrolling extends BiometricEnrollBaseimplements BiometricEnrollSidecar.Listener {protected BiometricEnrollSidecar mSidecar;protected abstract BiometricEnrollSidecar getSidecar();    // 抽象方法，由子类实现public void startEnrollment() {// 调用 BiometricEnrollSidecar 的 onStart() 方法mSidecar = (BiometricEnrollSidecar) getSupportFragmentManager().findFragmentByTag(TAG_SIDECAR);if (mSidecar == null) {mSidecar = getSidecar();    // 获取 mSidecargetSupportFragmentManager().beginTransaction().add(mSidecar, TAG_SIDECAR).commitAllowingStateLoss();}mSidecar.setListener(this);}}// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollEnrolling.javapublic class FingerprintEnrollEnrolling extends BiometricsEnrollEnrolling {@Overrideprotected BiometricEnrollSidecar getSidecar() {// 返回了一个继承自 BiometricEnrollSidecar 的 FingerprintEnrollSidecar 对象return new FingerprintEnrollSidecar();}}

六、FingerprintEnrollSidecar

6.1 FingerprintEnrollSidecar.startEnrollment()

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollSidecar.java/*** Sidecar fragment to handle the state around fingerprint enrollment.*/
public class FingerprintEnrollSidecar extends BiometricEnrollSidecar {private FingerprintManager mFingerprintManager;@Overrideprotected void startEnrollment() {super.startEnrollment();if (mUserId != UserHandle.USER_NULL) {mFingerprintManager.setActiveUser(mUserId);}/** 调用 FingeprintManager 的 enroll() 方法开始录入，并且传入了 EnrollmentCallback 对象* EnrollmentCallback 是指纹录入结果的回调，分别调用了 BiometricEnrollSidecar.Listener 接口中的方法，* 这样就能更新指纹录制的进度和录制结果。*/mFingerprintManager.enroll(mToken, mEnrollmentCancel, 0 /* flags */, mUserId, mEnrollmentCallback);}

我们看下 EnrollmentCallback 对象是什么：

// packages/apps/Settings/src/com/android/settings/biometrics/fingerprint/FingerprintEnrollSidecar.javapublic class FingerprintEnrollSidecar extends BiometricEnrollSidecar {private FingerprintManager.EnrollmentCallback mEnrollmentCallback= new FingerprintManager.EnrollmentCallback() {@Overridepublic void onEnrollmentProgress(int remaining) {FingerprintEnrollSidecar.super.onEnrollmentProgress(remaining);}@Overridepublic void onEnrollmentHelp(int helpMsgId, CharSequence helpString) {FingerprintEnrollSidecar.super.onEnrollmentHelp(helpMsgId, helpString);}@Overridepublic void onEnrollmentError(int errMsgId, CharSequence errString) {FingerprintEnrollSidecar.super.onEnrollmentError(errMsgId, errString);}};}

七、FingerprintManager

7.1 FingerprintManager.enroll()

// frameworks/base/core/java/android/hardware/fingerprint/FingerprintManager.javapublic class FingerprintManager implements BiometricAuthenticator, BiometricFingerprintConstants {private IFingerprintService mService;// CancellationSignal 类提供删除信号类，提供终止操作的能力@RequiresPermission(MANAGE_FINGERPRINT)public void enroll(byte [] token, CancellationSignal cancel, int flags,int userId, EnrollmentCallback callback) {if (userId == UserHandle.USER_CURRENT) {userId = getCurrentUserId();}if (callback == null) {throw new IllegalArgumentException("Must supply an enrollment callback");}if (cancel != null) {if (cancel.isCanceled()) {Slog.w(TAG, "enrollment already canceled");return;} else {cancel.setOnCancelListener(new OnEnrollCancelListener());}}if (mService != null) try {mEnrollmentCallback = callback;// 调用 FingerprintServiceWrapper 的 enroll() 方法mService.enroll(mToken, token, userId, mServiceReceiver, flags,mContext.getOpPackageName());} catch (RemoteException e) {Slog.w(TAG, "Remote exception in enroll: ", e);if (callback != null) {// Though this may not be a hardware issue, it will cause apps to give up or try// again later.callback.onEnrollmentError(FINGERPRINT_ERROR_HW_UNAVAILABLE,getErrorString(mContext, FINGERPRINT_ERROR_HW_UNAVAILABLE,0 /* vendorCode */));}}}}

八、FingerprintService

8.1 FingerprintServiceWrapper.enroll()

FingerprintManager 与 FingerprintService 直接通过 aidl 进行通信，在 FingerprintService 中内部类 FingerprintServiceWrapper 实现了 IFingerprintService.Stub，我们调用的 FingerManger 的 enroll() 方法就是调用 FingerprintServiceWrapper 类中的 enroll() 方法。

// frameworks/base/services/core/java/com/android/server/biometrics/fingerprint/FingerprintService.javapublic class FingerprintService extends BiometricServiceBase {/*** Receives the incoming binder calls from FingerprintManager.*/private final class FingerprintServiceWrapper extends IFingerprintService.Stub {@Override // Binder callpublic void enroll(final IBinder token, final byte[] cryptoToken, final int userId,final IFingerprintServiceReceiver receiver, final int flags,final String opPackageName) {checkPermission(MANAGE_FINGERPRINT);final boolean restricted = isRestricted();final int groupId = userId; // default group for fingerprint enrollmentfinal EnrollClientImpl client = new EnrollClientImpl(getContext(), mDaemonWrapper,mHalDeviceId, token, new ServiceListenerImpl(receiver), mCurrentUserId, groupId,cryptoToken, restricted, opPackageName, new int[0] /* disabledFeatures */,ENROLL_TIMEOUT_SEC) {@Overridepublic boolean shouldVibrate() {return true;}@Overrideprotected int statsModality() {return FingerprintService.this.statsModality();}};enrollInternal(client, userId);    // 调用 BiometricServiceBase 的 enrollInternal() 方法}}}

九、BiometricServiceBase

9.1 BiometricServiceBase.enrollInternal()

// frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.javapublic abstract class BiometricServiceBase extends SystemServiceimplements IHwBinder.DeathRecipient {protected void enrollInternal(EnrollClientImpl client, int userId) {if (hasReachedEnrollmentLimit(userId)) {return;}// Group ID is arbitrarily set to parent profile user ID. It just represents// the default biometrics for the user.if (!isCurrentUserOrProfile(userId)) {return;}mHandler.post(() -> {startClient(client, true /* initiatedByClient */);    // 调用 startClient() 方法});}      }

9.2 BiometricServiceBase.startClient()

// frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.javapublic abstract class BiometricServiceBase extends SystemServiceimplements IHwBinder.DeathRecipient {private void startClient(ClientMonitor newClient, boolean initiatedByClient) {ClientMonitor currentClient = mCurrentClient;if (currentClient != null) {if (DEBUG) Slog.v(getTag(), "request stop current client " +currentClient.getOwnerString());if (currentClient instanceof InternalEnumerateClient|| currentClient instanceof InternalRemovalClient) {if (newClient != null) {Slog.w(getTag(), "Internal cleanup in progress but trying to start client "+ newClient.getClass().getSuperclass().getSimpleName()+ "(" + newClient.getOwnerString() + ")"+ ", initiatedByClient = " + initiatedByClient);}} else {currentClient.stop(initiatedByClient);mHandler.removeCallbacks(mResetClientState);mHandler.postDelayed(mResetClientState, CANCEL_TIMEOUT_LIMIT);}mPendingClient = newClient;} else if (newClient != null) {if (newClient instanceof AuthenticationClient) {AuthenticationClient client = (AuthenticationClient) newClient;if (client.isBiometricPrompt()) {if (DEBUG) Slog.v(getTag(), "Returning cookie: " + client.getCookie());mCurrentClient = newClient;if (mBiometricService == null) {mBiometricService = IBiometricService.Stub.asInterface(ServiceManager.getService(Context.BIOMETRIC_SERVICE));}try {mBiometricService.onReadyForAuthentication(client.getCookie(),client.getRequireConfirmation(), client.getTargetUserId());} catch (RemoteException e) {Slog.e(getTag(), "Remote exception", e);}return;}}// We are not a BiometricPrompt client, start the client immediatelymCurrentClient = newClient;startCurrentClient(mCurrentClient.getCookie());    // 调用 startCurrentClient() 方法}}}

9.3 BiometricServiceBase.startCurrentClient()

// frameworks/base/services/core/java/com/android/server/biometrics/BiometricServiceBase.javapublic abstract class BiometricServiceBase extends SystemServiceimplements IHwBinder.DeathRecipient {private ClientMonitor mCurrentClient;protected void startCurrentClient(int cookie) {if (mCurrentClient == null) {Slog.e(getTag(), "Trying to start null client!");return;}if (DEBUG) Slog.v(getTag(), "starting client "+ mCurrentClient.getClass().getSuperclass().getSimpleName()+ "(" + mCurrentClient.getOwnerString() + ")"+ " targetUserId: " + mCurrentClient.getTargetUserId()+ " currentUserId: " + mCurrentUserId+ " cookie: " + cookie + "/" + mCurrentClient.getCookie());if (cookie != mCurrentClient.getCookie()) {Slog.e(getTag(), "Mismatched cookie");return;}notifyClientActiveCallbacks(true);mCurrentClient.start();    // 调用 EnrollClient 的 start() 方法}}

十、EnrollClient

10.1 EnrollClient.start()

// frameworks/base/services/core/java/com/android/server/biometrics/EnrollClient.java// EnrollClient 是为给定的客户端跟踪指纹录制状态
public abstract class EnrollClient extends ClientMonitor {// start 方法会调用 fingerprintd，调用底层的指纹库，底层库返回结果后会调用 onEnrollResult 来反馈结果给 receiver，再往上层反馈。@Overridepublic int start() {mEnrollmentStartTimeMs = System.currentTimeMillis();try {final ArrayList<Integer> disabledFeatures = new ArrayList<>();for (int i = 0; i < mDisabledFeatures.length; i++) {disabledFeatures.add(mDisabledFeatures[i]);}final int result = getDaemonWrapper().enroll(mCryptoToken, getGroupId(), mTimeoutSec,disabledFeatures);if (result != 0) {Slog.w(getLogTag(), "startEnroll failed, result=" + result);mMetricsLogger.histogram(mConstants.tagEnrollStartError(), result);onError(getHalDeviceId(), BiometricConstants.BIOMETRIC_ERROR_HW_UNAVAILABLE,0 /* vendorCode */);return result;}} catch (RemoteException e) {Slog.e(getLogTag(), "startEnroll failed", e);}return 0; // success}}

getDaemonWrapper().enroll() 会调用 fingerprintd，调用底层的指纹库，底层库返回结果后会调用 onEnrollResult 来反馈结果给 receiver，在往上层反馈。这就是指纹的录制流程。

// frameworks/base/core/java/android/hardware/fingerprint/FingerprintManager.javapublic class FingerprintManager implements BiometricAuthenticator, BiometricFingerprintConstants {private Handler mHandler;// mServiceReceiver 对象会通过 handler 发送相关消息去调用 EnrollmentCallback 或者 AuthenticationCallback 中方法private IFingerprintServiceReceiver mServiceReceiver = new IFingerprintServiceReceiver.Stub() {@Override // binder callpublic void onEnrollResult(long deviceId, int fingerId, int groupId, int remaining) {mHandler.obtainMessage(MSG_ENROLL_RESULT, remaining, 0,new Fingerprint(null, groupId, fingerId, deviceId)).sendToTarget();}@Override // binder callpublic void onAcquired(long deviceId, int acquireInfo, int vendorCode) {mHandler.obtainMessage(MSG_ACQUIRED, acquireInfo, vendorCode,deviceId).sendToTarget();}@Override // binder callpublic void onAuthenticationSucceeded(long deviceId, Fingerprint fp, int userId) {mHandler.obtainMessage(MSG_AUTHENTICATION_SUCCEEDED, userId, 0, fp).sendToTarget();}@Override // binder callpublic void onAuthenticationFailed(long deviceId) {mHandler.obtainMessage(MSG_AUTHENTICATION_FAILED).sendToTarget();}@Override // binder callpublic void onError(long deviceId, int error, int vendorCode) {mHandler.obtainMessage(MSG_ERROR, error, vendorCode, deviceId).sendToTarget();}@Override // binder callpublic void onRemoved(long deviceId, int fingerId, int groupId, int remaining) {mHandler.obtainMessage(MSG_REMOVED, remaining, 0,new Fingerprint(null, groupId, fingerId, deviceId)).sendToTarget();}@Override // binder callpublic void onEnumerated(long deviceId, int fingerId, int groupId, int remaining) {// TODO: propagate remainingmHandler.obtainMessage(MSG_ENUMERATED, fingerId, groupId, deviceId).sendToTarget();}};private class MyHandler extends Handler {private MyHandler(Context context) {super(context.getMainLooper());}private MyHandler(Looper looper) {super(looper);}@Overridepublic void handleMessage(android.os.Message msg) {switch (msg.what) {case MSG_ENROLL_RESULT:sendEnrollResult((Fingerprint) msg.obj, msg.arg1 /* remaining */);break;case MSG_ACQUIRED:sendAcquiredResult((Long) msg.obj /* deviceId */, msg.arg1 /* acquire info */,msg.arg2 /* vendorCode */);break;case MSG_AUTHENTICATION_SUCCEEDED:sendAuthenticatedSucceeded((Fingerprint) msg.obj, msg.arg1 /* userId */);break;case MSG_AUTHENTICATION_FAILED:sendAuthenticatedFailed();break;case MSG_ERROR:sendErrorResult((Long) msg.obj /* deviceId */, msg.arg1 /* errMsgId */,msg.arg2 /* vendorCode */);break;case MSG_REMOVED:sendRemovedResult((Fingerprint) msg.obj, msg.arg1 /* remaining */);break;case MSG_ENUMERATED:sendEnumeratedResult((Long) msg.obj /* deviceId */, msg.arg1 /* fingerId */,msg.arg2 /* groupId */);break;}}};
}

看下 MSG_ENROLL_RESULT：

// frameworks/base/core/java/android/hardware/fingerprint/FingerprintManager.javapublic class FingerprintManager implements BiometricAuthenticator, BiometricFingerprintConstants {private void sendEnrollResult(Fingerprint fp, int remaining) {if (mEnrollmentCallback != null) {// 调用 EnrollmentCallback 的 onEnrollmentProgress 方法mEnrollmentCallback.onEnrollmentProgress(remaining);}}}

# Enroll 流程图

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# 前言由于源码分析的代码量比较大,大部分博客网站的内容显示页面都比较窄,显示出来的效果都异常丑陋,所以您也可以直接查看 < Thinking in Android > 来阅读这边文章, ...
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【 Android 10 生物识别】系列 -- Fingerprint_指纹录入流程

# 前言

# 核心源码

# 相关类

一、FingerprintEnrollIntroduction

1.1 FingerprintEnrollIntroduction.onNextButtonClick()

二、BiometricEnrollIntroduction

2.1 BiometricEnrollIntroduction.onNextButtonClick()

2.2 BiometricEnrollIntroduction.launchNextEnrollingActivity()

三、FingerprintEnrollFindSensor

3.1 FingerprintEnrollFindSensor.onCreate()

3.2 FingerprintEnrollFindSensor.startLookingForFingerprint()

四、FingerprintEnrollEnrolling

4.1 FingerprintEnrollEnrolling.onStart()

五、BiometricsEnrollEnrolling

5.1 BiometricsEnrollEnrolling.onStart()

5.2 BiometricsEnrollEnrolling.startEnrollment()

六、FingerprintEnrollSidecar

6.1 FingerprintEnrollSidecar.startEnrollment()

七、FingerprintManager

7.1 FingerprintManager.enroll()

八、FingerprintService

8.1 FingerprintServiceWrapper.enroll()

九、BiometricServiceBase

9.1 BiometricServiceBase.enrollInternal()

9.2 BiometricServiceBase.startClient()

9.3 BiometricServiceBase.startCurrentClient()

十、EnrollClient

10.1 EnrollClient.start()

# Enroll 流程图

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【 Android 10 生物识别 】系列 -- Fingerprint_指纹录入流程

# 前言

# 核心源码

# 相关类

一、FingerprintEnrollIntroduction

1.1 FingerprintEnrollIntroduction.onNextButtonClick()

二、BiometricEnrollIntroduction

2.1 BiometricEnrollIntroduction.onNextButtonClick()

2.2 BiometricEnrollIntroduction.launchNextEnrollingActivity()

三、FingerprintEnrollFindSensor

3.1 FingerprintEnrollFindSensor.onCreate()

3.2 FingerprintEnrollFindSensor.startLookingForFingerprint()

四、FingerprintEnrollEnrolling

4.1 FingerprintEnrollEnrolling.onStart()

五、BiometricsEnrollEnrolling

5.1 BiometricsEnrollEnrolling.onStart()

5.2 BiometricsEnrollEnrolling.startEnrollment()

六、FingerprintEnrollSidecar

6.1 FingerprintEnrollSidecar.startEnrollment()

七、FingerprintManager

7.1 FingerprintManager.enroll()

八、FingerprintService

8.1 FingerprintServiceWrapper.enroll()

九、BiometricServiceBase

9.1 BiometricServiceBase.enrollInternal()

9.2 BiometricServiceBase.startClient()

9.3 BiometricServiceBase.startCurrentClient()

十、EnrollClient

10.1 EnrollClient.start()

# Enroll 流程图

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【 Android 10 生物识别】系列 -- Fingerprint_指纹录入流程

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