Android录屏流程

1.权限申明

2.请求录屏

    private MediaProjectionManager mMediaProjectionManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mBinding=DataBindingUtil.setContentView(this, R.layout.activity_main);
        mBinding.btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mMediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);
                startActivityForResult(mMediaProjectionManager.createScreenCaptureIntent(),
                        REQUEST_MEDIA_PROJECTION);
            }
        });

    }

3.判断录屏请求结果，然后将返回的数据给新创建的后台录屏服务

    @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) {
                    RecordService.setResultData(data);
                    startService(new Intent(getApplicationContext(), RecordService.class));
                }
                break;
        }
    }

4.在录屏服务里开启一个线程并初始化ImageReader，MediaProjection，VirtualDisplay

    private void initScreenCapture(){
        mScreenDensity = ScreenUtils.getScreenDensityDpi();
        mScreenWidth = ScreenUtils.getScreenWidth();
        mScreenHeight = ScreenUtils.getScreenHeight();
        mImageReader = ImageReader.newInstance(mScreenWidth, mScreenHeight, PixelFormat.RGBA_8888, 2);
        mMediaProjection =((MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE))
                .getMediaProjection(Activity.RESULT_OK, mResultData);
        mVirtualDisplay = mMediaProjection.createVirtualDisplay("screen-mirror",
                mScreenWidth, mScreenHeight, mScreenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
                mImageReader.getSurface(), null, null);
    }

5.从ImageReader中获取最新屏幕图像并处理

    private boolean getScreenCapture() {
        Image image = mImageReader.acquireLatestImage();
        if (image!=null){
            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;
            if (mBitmap==null){
                mBitmap = Bitmap.createBitmap(width + rowPadding / pixelStride, height, Bitmap.Config.ARGB_8888);
            }
            mBitmap.copyPixelsFromBuffer(buffer);
            image.close();
            return true;
        }
        return false;
    }

6.最后记得释放VirtualDisplay，MediaProjection

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mVirtualDisplay == null) {
            return;
        }
        mVirtualDisplay.release();
        mVirtualDisplay = null;

        if (mMediaProjection != null) {
            mMediaProjection.stop();
            mMediaProjection = null;
        }
    }