视频流截屏

直播项目中，截取当前的视频手机画面分享主播，支持android5.0以上手机。

调用方法，其中mRl是布局父控件，

private String TAG = "TAG";

private MediaProjection mediaProjection;
MediaProjectionManager projectionManager;
private VirtualDisplay virtualDisplay;
private int mResultCode;
private Intent mData;
private ImageReader imageReader;

private int width;
private int height;
private int dpi;
private String imageName;
private Bitmap bitmap;

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
private void capture() {
    DisplayMetrics metric = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(metric);
    width = metric.widthPixels;
    height = metric.heightPixels;
    dpi = metric.densityDpi;
    projectionManager = (MediaProjectionManager) getSystemService(MEDIA_PROJECTION_SERVICE);
    StartScreenShot(mRl);
}/**

 * 调用截屏方法
 *
 * @param view 需要截取的视图
 */
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public void StartScreenShot(View view) {
    startActivityForResult(projectionManager.createScreenCaptureIntent(),
            SCREEN_SHOT);
}

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == SCREEN_SHOT) {
        if (resultCode == RESULT_OK) {
            mResultCode = resultCode;
            mData = data;
            setUpMediaProjection();
            setUpVirtualDisplay();
            startCapture();
        }
    }
}

   @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private void setUpVirtualDisplay() {
        imageReader = ImageReader.newInstance(width, height, PixelFormat.RGBA_8888, 1);
        mediaProjection.createVirtualDisplay("ScreenShout",
                width, height, dpi,
                DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
                imageReader.getSurface(), null, null);
    }

    @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
    private void setUpMediaProjection() {
        mediaProjection = projectionManager.getMediaProjection(mResultCode, mData);
    }

    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
    private void startCapture() {
        SystemClock.sleep(1000);
        imageName = System.currentTimeMillis() + ".png";
        Image image = imageReader.acquireNextImage();
        if (image == null) {
            Log.e(TAG, "image is null.");
            return;
        }
        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.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
        bitmap.copyPixelsFromBuffer(buffer);
        image.close();
        if (bitmap != null) {
           //获得图片资源
        }
    }

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