Question

我正在使用TextureView在ListView中播放视频。 TextureView本身运行正常，但是，如果我按下主页按钮并重新输入应用程序几次，TextureView会变黑（尽管音频继续播放）。如果我退出并重新进入，TextureView将变为白色（或者可能是透明的，因为白色是我背景的颜色）。

这是我的代码：

holder.instagramTextureView
    .setSurfaceTextureListener(new SurfaceTextureListener() {

        @Override
        public void onSurfaceTextureUpdated(
                SurfaceTexture surface) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onSurfaceTextureSizeChanged(
                SurfaceTexture surface, int width, int height) {
            // TODO Auto-generated method stub

        }

        @Override
        public boolean onSurfaceTextureDestroyed(
                SurfaceTexture surface) {
            // TODO Auto-generated method stub
            return false;
        }

        @Override
        public void onSurfaceTextureAvailable(
                SurfaceTexture surface, int width, int height) {
            final Surface s = new Surface(surface);

            try {
                holder.mMediaPlayer = new MediaPlayer();
                holder.mMediaPlayer.setDataSource(post
                                .getMedias().get(0)
                                .getMediaUrlVideomp4StandardRes());
                holder.mMediaPlayer.setSurface(s);
                holder.mMediaPlayer.prepare();

                holder.instagramVideoVolume = 0f;
                holder.mMediaPlayer.setVolume(
                        holder.instagramVideoVolume,
                        holder.instagramVideoVolume);
                //holder.mMediaPlayer.setOnBufferingUpdateListener(this);

                holder.mMediaPlayer
                    .setOnCompletionListener(new OnCompletionListener() {
                        @Override
                        public void onCompletion(
                                MediaPlayer mp) {

                            // To play:
                            mp.reset();
                            try {
                                mp.setDataSource(post
                                    .getMedias()
                                    .get(0)
                                    .getMediaUrlVideomp4StandardRes());
                                mp.prepare();

                            } catch (IllegalArgumentException e) {
                                // TODO Auto-generated catch
                                // block
                                e.printStackTrace();
                            } catch (SecurityException e) {
                                // TODO Auto-generated catch
                                // block
                                e.printStackTrace();
                            } catch (IllegalStateException e) {
                                // TODO Auto-generated catch
                                // block
                                e.printStackTrace();
                            } catch (IOException e) {
                                // TODO Auto-generated catch
                                // block
                                e.printStackTrace();
                            }
                            // <--- Here comes a call to
                            // "To Resize" which is shown
                            // right above this code
                            mp.start();
                        }
                });

                // holder.mMediaPlayer.setOnPreparedListener(this);
                //holder.mMediaPlayer.setOnVideoSizeChangedListener(this);

                holder.mMediaPlayer
                    .setAudioStreamType(AudioManager.STREAM_MUSIC);
                holder.mMediaPlayer.start();

                holder.instagramTextureView
                    .setOnClickListener(new OnClickListener() {

                        @Override
                        public void onClick(View v) {
                            if (holder.instagramVideoVolume == 1) {
                                holder.instagramVideoVolume = 0f;
                                holder.mMediaPlayer
                                    .setVolume(
                                        holder.instagramVideoVolume,
                                        holder.instagramVideoVolume);
                            } else {
                                holder.instagramVideoVolume = 1f;
                                holder.mMediaPlayer
                                    .setVolume(
                                        holder.instagramVideoVolume,
                                        holder.instagramVideoVolume);
                                    }
                            }
                });

            } catch (IllegalArgumentException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (SecurityException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IllegalStateException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
});

Answer 1

每次表面可用时，问题就是制作新的媒体播放器。不太确定这是如何工作的，但这就是问题所在。相反，我在这个听众之外创建了媒体播放器。

Answer 2

根据我的研究，const int a; // preferred int const a; // same, not preferred const volatile int b; // preferred volatile const int b; // same, not preferred volatile int const b; // same, not preferred const int *p; // preferred int const *p; // same, not preferred返回null textureView.getSurfaceTexture()。我所做的是在onResume()重新附加一个听众。

onResume()

然后，在TextureView textureView; /*.... Usual stuff */ public void onPause(){ super.onPause(); //... destroy or disable image producer } public void onResume(){ super.onResume(); textureView.setSurfaceTextureListener(/*another listener*/); }

上执行常规操作

Answer 3

当我没有释放MediaPlayer对象时，黑屏和音频播放就发生了。

播放视频的TextureView在onPause后变为黑色

3 个答案: