使用SurfaceView实现手机息屏状态下的静默拍照保存,上传服务器

注意:本文章只适用于技术交流,请你友好交流净化开发环境

思考

由于谷歌强制在Android应用开发中编写拍照程序是必需要有图像预览的。这对那些恶意程序比如Android中泛滥的Service在后台偷偷记录手机用户的行为与周边信息。这样的门槛还包括手机厂商自带的相机软件在拍照时必须是有声音，这样要避免一些偷拍的情况;据说oppo find系列及vivo Nex系列可以检测出那些流氓软件这么做了。

步骤

创建一个surfaView对象

preview = new SurfaceView(this);holder = preview.getHolder();// deprecated setting, but required on Android versions prior to 3.0holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);holder.addCallback(new SurfaceHolder.Callback() {@Override//The preview must happen at or after this point or takePicture failspublic void surfaceCreated(SurfaceHolder holder) {//创建成功以后打开相机/*** camaraType: Camera.CameraInfo.CAMERA_FACING_FRONT :打开前置摄像头* camaraType: Camera.CameraInfo.CAMERA_FACING_BACK :打开后置摄像头*/try {camera = Camera.open(camaraType);try {camera.setPreviewDisplay(holder);} catch (IOException e) {throw new RuntimeException(e);}camera.startPreview();Log.d(TAG, "Started preview");camera.takePicture(null, null, pictureCallback);} catch (Exception e) {if (camera != null)camera.release();throw new RuntimeException(e);}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}});

使用WindowManager增加一个1*1px的悬浮框

    wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);//设置悬浮框为:1 * 1 :记得用后将其remove否则其他界面得不到交点,并且下拉框会有提示:应用在他应用的上层显示的应用，关于这个设置选项WindowManager.LayoutParams params = new WindowManager.LayoutParams(1, 1, //设置成宽:1px , 高:1pxWindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,0, PixelFormat.UNKNOWN);/*** 根据不同的版本设置:TYPE_APPLICATION_OVERLAY 在低于26版本中报错崩溃* 但是在Android O的系统中，google规定申请android.permission.SYSTEM_ALERT_WINDOW权限的应用需要给悬浮窗口设置如下params.type*/if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;}

将SurfaceView添加到WindowManager中
```
wm.addView(preview, params);
```

拍照结果的回掉保存(注意: 上层的1*1px的拍照布局 : 一定要移除,一定要移除,一定要移除,重要的妖怪打三遍---不然切换点击屏幕其他位置手机是获取不到焦点,没有反应的)

/*** 拍照开始后结果的回调*/
private Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {Log.d(TAG, "onPictureTaken");if(null == data){return;}Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);camera.stopPreview();Matrix matrix = new Matrix();matrix.postRotate((float) 270.0); //旋转拍照结果,可能方向不正确bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),bitmap.getHeight(), matrix, false);Log.d(TAG, "original bitmap width: " + bitmap.getWidth() +" height: " + bitmap.getHeight());Bitmap sizeBitmap = Bitmap.createScaledBitmap(bitmap,bitmap.getWidth()/3, bitmap.getHeight()/3, true);Log.d(TAG,"size bitmap width "+sizeBitmap.getWidth()+" height "+sizeBitmap.getHeight());//裁剪bitmapint leftOffset = (int)(sizeBitmap.getWidth() * 0.25);int topOffset = (int)(sizeBitmap.getHeight() * 0.25);Rect rect = new Rect(leftOffset, topOffset, sizeBitmap.getWidth() - leftOffset,sizeBitmap.getHeight() - topOffset);Bitmap rectBitmap = Bitmap.createBitmap(sizeBitmap,rect.left, rect.top, rect.width(), rect.height());try {//保存图片FileOutputStream outputStream = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/photoResize.jpg");sizeBitmap.compress(Bitmap.CompressFormat.JPEG, 30, outputStream);outputStream.close();FileOutputStream outputStreamOriginal = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/photoOriginal.jpg");bitmap.compress(Bitmap.CompressFormat.JPEG, 20, outputStreamOriginal);outputStreamOriginal.close();FileOutputStream outputStreamCut = new FileOutputStream(Environment.getExternalStorageDirectory().toString()+"/photoCut.jpg");rectBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStreamCut);outputStreamCut.close();//通知系统相册更新sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"+ Environment.getExternalStorageDirectory().toString()+"/photoResize.jpg")));sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://"+ Environment.getExternalStorageDirectory().toString()+"/photoOriginal.jpg")));sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory().toString() + "/photoCut.jpg")));Log.d(TAG,"picture saved!");if (camera != null) {camera.release();//移除上层的1*1px的拍照布局 : 一定要移除,不然点击屏幕其他位置手机没有反应wm.removeView(preview);}Toast.makeText(TakePhotoActy.this , "照片保存成功,可以开启服务上传照片然后注意删除本地相册!" , Toast.LENGTH_SHORT).show();
//                System.exit(0); //如果没有设置removeView()方法,可以通过强制退出实现焦点回归} catch(Exception e) {e.printStackTrace();}}
};

添加权限(导入三方权限管理) 点击查看: xxpermissions
//android6.0以上系统需要动态申请拍照及存储权限,对于测试可以手动打开权限管理给与对应权限即可 <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-feature android:name="android.hardware.camera" /> <uses-feature android:name="android.hardware.camera.autofocus" />

权限管理

//使用三方控件:https://github.com/getActivity/XXPermissions 简单演示
//build中导入
implementation 'com.hjq:xxpermissions:5.0'
if (Build.VERSION.SDK_INT >= 23) {requestPermission();}
private void requestPermission() {//1. 检查是否已经有该权限XXPermissions.with(this).constantRequest() //可设置被拒绝后继续申请，直到用户授权或者永久拒绝.permission(Permission.WRITE_EXTERNAL_STORAGE , Permission.CAMERA) //不指定权限则自动获取清单中的危险权限.request(new OnPermission() {@Overridepublic void hasPermission(List<String> granted, boolean isAll) {if (isAll) {
//                            Toast.makeText(TakePhotoActy.this, "获取权限成功", Toast.LENGTH_SHORT).show();}else {
//                            Toast.makeText(TakePhotoActy.this, "获取权限成功，部分权限未正常授予", Toast.LENGTH_SHORT).show();}}@Overridepublic void noPermission(List<String> denied, boolean quick) {if(quick) {Toast.makeText(TakePhotoActy.this, "拍照需要你授权,否则不能正常使用", Toast.LENGTH_SHORT).show();//如果是被永久拒绝就跳转到应用权限系统设置页面
//                            XXPermissions.gotoPermissionSettings(TakePhotoActy.this);}else {Toast.makeText(TakePhotoActy.this, "获取权限失败", Toast.LENGTH_SHORT).show();}}});}

全部示例代码(在小米8:8.0系统,魅族6.0上均测试通过)

activity代码:

/*** created by shi on 2018/9/10/010*/
public class TakePhotoActy extends Activity implements View.OnClickListener {private static final String TAG = "shiq";private SurfaceView preview;private SurfaceHolder holder;private final int MESSAGE_LOGIN = 1;private int camaraType = Camera.CameraInfo.CAMERA_FACING_FRONT;/*** 测试息屏状态10s拍照效果*/private Handler handler = new Handler(new Handler.Callback() {@Overridepublic boolean handleMessage(Message msg) {if (msg.what == MESSAGE_LOGIN) {Log.e(TAG, "我是收到的拍照界面");setTakePhoto();}return true;}});private WindowManager wm;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_take);initView();}private void initView() {Button bt_photo_force = findViewById(R.id.bt_photo_force);bt_photo_force.setOnClickListener(this);Button bt_photo_back = findViewById(R.id.bt_photo_back);bt_photo_back.setOnClickListener(this);if (Build.VERSION.SDK_INT >= 23) {requestPermission();}//验证息屏状态下的拍照:五秒后发送//handler.sendEmptyMessageDelayed(MESSAGE_LOGIN, 10000);}/*** 权限管理请求:需要存储及相机权限,如果上传到服务器后删除,加上请求读取权限*/private void requestPermission() {//1. 检查是否已经有该权限XXPermissions.with(this).constantRequest() //可设置被拒绝后继续申请，直到用户授权或者永久拒绝.permission(Permission.WRITE_EXTERNAL_STORAGE , Permission.CAMERA) //不指定权限则自动获取清单中的危险权限.request(new OnPermission() {@Overridepublic void hasPermission(List<String> granted, boolean isAll) {if (isAll) {
//                            Toast.makeText(TakePhotoActy.this, "获取权限成功", Toast.LENGTH_SHORT).show();}else {
//                            Toast.makeText(TakePhotoActy.this, "获取权限成功，部分权限未正常授予", Toast.LENGTH_SHORT).show();}}@Overridepublic void noPermission(List<String> denied, boolean quick) {if(quick) {Toast.makeText(TakePhotoActy.this, "拍照需要你授权,否则不能正常使用", Toast.LENGTH_SHORT).show();//如果是被永久拒绝就跳转到应用权限系统设置页面
//                            XXPermissions.gotoPermissionSettings(TakePhotoActy.this);}else {Toast.makeText(TakePhotoActy.this, "获取权限失败", Toast.LENGTH_SHORT).show();}}});}private Camera camera = null;@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.bt_photo_force:camaraType = Camera.CameraInfo.CAMERA_FACING_FRONT;break;case R.id.bt_photo_back:camaraType = Camera.CameraInfo.CAMERA_FACING_BACK;break;}setTakePhoto();}private void setTakePhoto() {preview = new SurfaceView(this);holder = preview.getHolder();// deprecated setting, but required on Android versions prior to 3.0holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);holder.addCallback(new SurfaceHolder.Callback() {@Override//The preview must happen at or after this point or takePicture failspublic void surfaceCreated(SurfaceHolder holder) {//创建成功以后打开相机/*** camaraType: Camera.CameraInfo.CAMERA_FACING_FRONT :打开前置摄像头* camaraType: Camera.CameraInfo.CAMERA_FACING_BACK :打开后置摄像头*/try {camera = Camera.open(camaraType);try {camera.setPreviewDisplay(holder);} catch (IOException e) {throw new RuntimeException(e);}camera.startPreview();Log.d(TAG, "Started preview");camera.takePicture(null, null, pictureCallback);} catch (Exception e) {if (camera != null)camera.release();throw new RuntimeException(e);}}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {}});wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);//设置悬浮框为:1 * 1 :记得用后将其remove否则其他界面得不到交点,并且下拉框会有提示:应用在他应用的上层显示的应用，关于这个设置选项WindowManager.LayoutParams params = new WindowManager.LayoutParams(1, 1, //设置成宽:1px , 高:1pxWindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, 0, PixelFormat.UNKNOWN);/*** 根据不同的版本设置:TYPE_APPLICATION_OVERLAY 在低于26版本中报错崩溃* 但是在Android O的系统中，google规定申请android.permission.SYSTEM_ALERT_WINDOW权限的应用需要给悬浮窗口设置如下params.type*/if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {params.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;}wm.addView(preview, params);}/*** 拍照开始后结果的回调*/private Camera.PictureCallback pictureCallback = new Camera.PictureCallback() {@Overridepublic void onPictureTaken(byte[] data, Camera camera) {Log.d(TAG, "onPictureTaken");if (null == data) {return;}Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);camera.stopPreview();Matrix matrix = new Matrix();matrix.postRotate((float) 270.0); //旋转拍照结果,可能方向不正确bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(),bitmap.getHeight(), matrix, false);Log.d(TAG, "original bitmap width: " + bitmap.getWidth() +" height: " + bitmap.getHeight());Bitmap sizeBitmap = Bitmap.createScaledBitmap(bitmap,bitmap.getWidth() / 3, bitmap.getHeight() / 3, true);Log.d(TAG, "size bitmap width " + sizeBitmap.getWidth() + " height " + sizeBitmap.getHeight());//裁剪bitmapint leftOffset = (int) (sizeBitmap.getWidth() * 0.25);int topOffset = (int) (sizeBitmap.getHeight() * 0.25);Rect rect = new Rect(leftOffset, topOffset, sizeBitmap.getWidth() - leftOffset,sizeBitmap.getHeight() - topOffset);Bitmap rectBitmap = Bitmap.createBitmap(sizeBitmap,rect.left, rect.top, rect.width(), rect.height());try {//保存图片FileOutputStream outputStream = new FileOutputStream(Environment.getExternalStorageDirectory().toString() + "/photoResize.jpg");sizeBitmap.compress(Bitmap.CompressFormat.JPEG, 30, outputStream);outputStream.close();FileOutputStream outputStreamOriginal = new FileOutputStream(Environment.getExternalStorageDirectory().toString() + "/photoOriginal.jpg");bitmap.compress(Bitmap.CompressFormat.JPEG, 20, outputStreamOriginal);outputStreamOriginal.close();FileOutputStream outputStreamCut = new FileOutputStream(Environment.getExternalStorageDirectory().toString() + "/photoCut.jpg");rectBitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStreamCut);outputStreamCut.close();//通知系统相册更新sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory().toString() + "/photoResize.jpg")));sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory().toString() + "/photoOriginal.jpg")));sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + Environment.getExternalStorageDirectory().toString() + "/photoCut.jpg")));Log.d(TAG, "picture saved!");if (camera != null) {camera.release();//移除上层的1*1px的拍照布局 : 一定要移除,不然点击屏幕其他位置手机没有反应wm.removeView(preview);}Toast.makeText(TakePhotoActy.this, "照片保存成功,可以开启服务上传照片然后注意删除本地相册!", Toast.LENGTH_SHORT).show();//System.exit(0); //如果没有设置removeView()方法,可以通过强制退出实现焦点回归} catch (Exception e) {e.printStackTrace();}}};
}

布局文件很简单就是普通的两个button测试

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"><Button
    android:id="@+id/bt_photo_force"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="前置拍照"/><Button
    android:id="@+id/bt_photo_back"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="后置拍照" /></LinearLayout

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使用SurfaceView实现手机息屏状态下的静默拍照保存,上传服务器

思考

步骤

全部示例代码(在小米8:8.0系统,魅族6.0上均测试通过)

使用SurfaceView实现手机息屏状态下的静默拍照保存,上传服务器相关推荐

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