录制surfaceview内容

要录制SurfaceView的内容，可以使用MediaRecorder类。下面是一个简单的例子：

public class MainActivity extends AppCompatActivity {

    private SurfaceView surfaceView;
    private SurfaceHolder surfaceHolder;
    private Camera camera;
    private MediaRecorder mediaRecorder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        surfaceView = findViewById(R.id.surfaceView);
        surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                camera = Camera.open();
                Camera.Parameters params = camera.getParameters();
                camera.setParameters(params);
                camera.setDisplayOrientation(90);
                try {
                    camera.setPreviewDisplay(holder);
                    camera.startPreview();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                camera.stopPreview();
                camera.release();
            }
        });

        // 初始化MediaRecorder
        mediaRecorder = new MediaRecorder();
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.DEFAULT);
        mediaRecorder.setVideoSize(640, 480);
        mediaRecorder.setVideoFrameRate(30);
        mediaRecorder.setOutputFile(Environment.getExternalStorageDirectory().getPath() + "/test.mp4");
    }

    public void startRecording(View view) {
        try {
            mediaRecorder.prepare();
            mediaRecorder.start();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void stopRecording(View view) {
        mediaRecorder.stop();
        mediaRecorder.reset();
    }
}

在这个例子中，我们使用了Android自带的Camera类来获取SurfaceView的预览画面。然后，我们使用MediaRecorder类来录制视频。在startRecording方法中，我们调用mediaRecorder.prepare()和mediaRecorder.start()来开始录制视频。在stopRecording方法中，我们调用mediaRecorder.stop()来停止录制。最后，我们把录制好的视频保存在SD卡的根目录下，文件名为test.mp4。

需要注意的是，在Android 6.0及以上的版本中，需要动态获取录音和存储权限。可以参考官方文档：https://developer.android.com/training/permissions/requesting.html