Android 5.0及以上编程实现屏幕截图功能的方法

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public void requestCapturePermission() {
 if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
 //5.0 之后才允许使用屏幕截图
 return;
 }
 MediaProjectionManager mediaProjectionManager = (MediaProjectionManager)
  getSystemService(Context.MEDIA_PROJECTION_SERVICE);
 startActivityForResult(
  mediaProjectionManager.createScreenCaptureIntent(),
  REQUEST_MEDIA_PROJECTION);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);
  switch (requestCode) {
   case REQUEST_MEDIA_PROJECTION:
   if (resultCode == RESULT_OK && data != null) {
    FloatWindowsService.setResultData(data);
    startService(new Intent(getApplicationContext(), FloatWindowsService.class));
   } 
  break;
  }
}

private void createImageReader() {
  mImageReader = ImageReader.newInstance(mScreenWidth, mScreenHeight, PixelFormat.RGBA_8888, 2); 
}

private void startScreenShot() {
  mFloatView.setVisibility(View.GONE);
  Handler handler = new Handler();
  handler.postDelayed(new Runnable() {
  public void run() {
   //获取当前屏幕内容
   startVirtual();
  }
  }, 5);
  handler.postDelayed(new Runnable() {
  public void run() {
   //生成图片保存到本地
   startCapture();
  }
  }, 30);
}

public void startVirtual() {
  if (mMediaProjection != null) {
  virtualDisplay();
  } else {
  setUpMediaProjection();
  virtualDisplay();
  }
}

public void setUpMediaProjection() {
 if (mResultData == null) {
  Intent intent = new Intent(Intent.ACTION_MAIN);
  intent.addCategory(Intent.CATEGORY_LAUNCHER);
  startActivity(intent);
 } else {
  //mResultData是在Activity中用户授权后返回的结果
  mMediaProjection = getMediaProjectionManager().getMediaProjection(Activity.RESULT_OK, mResultData);
 }
}

private void virtualDisplay() {
 mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",
 mScreenWidth, mScreenHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
 mImageReader.getSurface(), null, null);
}

@Override
protected Bitmap doInBackground(Image... params) {
 if (params == null || params.length < 1 || params[0] == null) {
  return null;
 }
 Image image = params[0];
 int width = image.getWidth();
 int height = image.getHeight();
 final Image.Plane[] planes = image.getPlanes();
 final ByteBuffer buffer = planes[0].getBuffer();
 //每个像素的间距
 int pixelStride = planes[0].getPixelStride();
 //总的间距
 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);
 image.close();