尝试在Android的媒体播放器中切换SurfaceView以获取流式视频时，我会看到黑屏

Question

我正在使用此代码来测试：https://gist.github.com/ErikHellman/5840101

这适用于存储在设备上的视频。但是对于流视频，我无法在运行时切换视图。

我正在使用的流媒体网址是：rtsp：//wowzaec2demo.streamlock.net/vod/mp4：BigBuckBunny_115k.mov

我能让它工作的唯一方法是重置我的播放器。但是，由于我正在播放视频，重置或释放播放器不适合我。

以下是我的MainActivity代码：

package com.example.testvideo;



import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;

@SuppressWarnings("ConstantConditions")
public class MainActivity extends Activity {

    private static final int PICK_VIDEO_REQUEST = 1001;
    private static final String TAG = "SurfaceSwitch";
    private MediaPlayer mMediaPlayer;
    private SurfaceHolder mFirstSurface;
    private SurfaceHolder mSecondSurface;
    private SurfaceHolder mActiveSurface;
    private Uri mVideoUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        SurfaceView first = (SurfaceView) findViewById(R.id.firstSurface);
        first.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                Log.d(TAG, "First surface created!");
                mFirstSurface = surfaceHolder;
                if (mVideoUri != null) {
                    mMediaPlayer = MediaPlayer.create(getApplicationContext(),
                            mVideoUri, mFirstSurface);
                    mActiveSurface = mFirstSurface;
                    mMediaPlayer.start();
                }
            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
                Log.d(TAG, "First surface destroyed!");
            }
        });
        SurfaceView second = (SurfaceView) findViewById(R.id.secondSurface);
        second.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder surfaceHolder) {
                Log.d(TAG, "Second surface created!");
                mSecondSurface = surfaceHolder;
            }

            @Override
            public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {

            }

            @Override
            public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
                Log.d(TAG, "Second surface destroyed!");
            }
        });
    }

    @Override
    protected void onPause() {
        super.onPause();
        mVideoUri = null;
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (mMediaPlayer != null) {
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == PICK_VIDEO_REQUEST && resultCode == RESULT_OK) {
            Log.d(TAG, "Got video " + data.getData());
            //mVideoUri = data.getData();
            mVideoUri = Uri.parse("rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mov");
        }
    }

    public void doStartStop(View view) {
        if (mMediaPlayer == null) {
            Intent pickVideo = new Intent(Intent.ACTION_PICK);
            pickVideo.setTypeAndNormalize("video/*");
            startActivityForResult(pickVideo, PICK_VIDEO_REQUEST);
        } else {
            mMediaPlayer.stop();
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    public void doSwitchSurface(View view) {
        if (mMediaPlayer != null && mMediaPlayer.isPlaying()) {
            mActiveSurface = mFirstSurface == mActiveSurface ? mSecondSurface : mFirstSurface;
            mMediaPlayer.setDisplay(mActiveSurface);
        }
    }
}