Android10以上MediaProjection截屏

起因

在系统升级到Android10以上之后，之前的截屏方式不能用了，而且必须将MediaProjection放在forground service里面跑才行。网上搜了一圈，都是语焉不详或者没有完整的一个代码应用。只能自己写一个，记录下

代码实现

新建一个ScreenRecorder.java


public class ScreenRecorder extends Service {
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    private MediaProjection mMediaProjection;
    private MediaProjectionManager mMediaProjectionManager;
    private int SERVICE_ID = 123;
    private String NOTIFICATION_CHANNEL_ID = "Screen Capture channel";
    public static final String ACTION_START = "RecordService:Start";
    public static final String ACTION_SNAPSHOT = "RecordService:Snapshot";
    public static final String ACTION_STOP = "RecordService:Stop";
    public static final String EXTRA_RESULT_DATA = "RecordService:Extra:ResultData";

    @Override
    public void onCreate() {
        super.onCreate();
        createNotificationChannel();
        startForeground(SERVICE_ID, new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID).build());
        mMediaProjectionManager = (MediaProjectionManager) getApplicationContext().getSystemService(Context.MEDIA_PROJECTION_SERVICE);
    }

    @Override
    public int onStartCommand(final Intent intent, int flags, int startId) {
        if (intent != null) {
            if (intent.getAction() != null) {
                switch (intent.getAction()) {
                    case ACTION_START:
                        Log.d(TAG, "onStartCommand: start recorder");
                        mMediaProjection = mMediaProjectionManager.getMediaProjection(Activity.RESULT_OK,
                                Objects.requireNonNull(intent.getParcelableExtra(EXTRA_RESULT_DATA)));
                        startCapture();
                        return START_STICKY;
                    case ACTION_SNAPSHOT:
//                        stopSelf();
                        snapshot();
                        break;
                    case ACTION_STOP:
                        Log.d(TAG, "onStartCommand: close imagereader");
                        if (mImageReader != null){
                            try{
                                mImageReader.close();
                            }catch (Exception exception){
                                Log.e(TAG, "onStartCommand: "+ exception.getMessage() );
                            }
                        }
                        stopSelf();
                        return START_NOT_STICKY;
                }

            }
        }
        return super.onStartCommand(intent, flags, startId);
    }

    private void createNotificationChannel() {
        NotificationChannel notificationChannel = new NotificationChannel(
                NOTIFICATION_CHANNEL_ID,
                "ScreenRecorder",
                NotificationManager.IMPORTANCE_DEFAULT
        );
        NotificationManager manager = getSystemService(NotificationManager.class);
        manager.createNotificationChannel(notificationChannel);
    }

    private ImageReader mImageReader;
    private void startCapture() {
        DisplayMetrics displayMetrics = new DisplayMetrics();
        WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
        windowManager.getDefaultDisplay().getMetrics(displayMetrics);
        int screenWidth = displayMetrics.widthPixels;
        int screenHeight = displayMetrics.heightPixels;
        mImageReader = ImageReader.newInstance(screenWidth, screenHeight, PixelFormat.RGBA_8888, 2);
        mMediaProjection.createVirtualDisplay("mediaprojection", screenWidth, screenHeight,
                displayMetrics.densityDpi, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR, mImageReader.getSurface(), null, null);

    }

    private void snapshot(){
        if (mImageReader != null){
            Image image = mImageReader.acquireLatestImage();
            int width = image.getWidth();
            int height = image.getHeight();
            final Image.Plane[] planes = image.getPlanes();
            final ByteBuffer buffer = planes[0].getBuffer();
            int pixelStride = planes[0].getPixelStride();
            int rowStride = planes[0].getRowStride();
            int rowPadding = rowStride - pixelStride * width;
            Bitmap bitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height,
                    Bitmap.Config.ARGB_8888);
            bitmap.copyPixelsFromBuffer(buffer);
            bitmap = Bitmap.createBitmap(bitmap, 0, 0, width, height);
            //保存图片到本地
            CommonLib.saveMyBitmap("snapshot", bitmap);
            image.close();
        }

    }
}

AndroidManifest.xml中注册

<!--   申请权限 />-->
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<service android:name=".ScreenRecorder"
            android:exported="true"
            android:foregroundServiceType="mediaProjection"/>

Activity中调用

 public void onCreate(Bundle bundle) {
 	super.onCreate(bundle);
 	requestCapturePermission();
 }
/**
* 申请权限
*/
 public void requestCapturePermission() {
     MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);
     Intent intent = new Intent(mediaProjectionManager.createScreenCaptureIntent());
     startActivityForResult(intent, REQUESTRESULT);
 }
// 回调里面启动服务
@Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      if (resultCode == RESULT_OK) {
          Intent intent = new Intent(this, ScreenRecorder.class);
          intent.setAction(ScreenRecorder.ACTION_START);
          intent.putExtra(ScreenRecorder.EXTRA_RESULT_DATA, data);
          startForegroundService(intent);
          EnableTakePhotos = true;
	}
}

snapshot方法

private void startSnapshot(){
 	Intent intent = new Intent(this, ScreenRecorder.class);
    intent.setAction(ScreenRecorder.ACTION_SNAPSHOT);
    startService(intent);
}