当屏幕方向改变并重新创建活动时，媒体播放器无法加载。

Question

当屏幕方向改变并重新创建活动时，媒体播放器无法加载。

androidandroid-activityandroid-mediaplayerandroid-orientationandroid-framelayout

4

我是新手，想使用SurfaceView播放视频，现在我想在屏幕方向改变时保存媒体播放器的实例状态，当视图重新加载或重新创建时，旧的媒体播放器状态将从旧位置开始，而不是从原始位置开始加载（即从零位置开始）。我在清单文件中设置了屏幕方向，但此时onCreate方法未被调用。我希望在屏幕方向改变时也调用onCreate方法，也就是说，我希望在屏幕方向改变时重新加载一个新的活动，并保存媒体播放器的状态。请确认，我卡在那个时候，我不知道哪里出错了。

 SurfaceView videoSurface;
         MediaPlayer player;
        VideoControllerView controller;
        private boolean mFullScreen = true;

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



                videoSurface = (SurfaceView) findViewById(R.id.videoSurface);
                SurfaceHolder videoHolder = videoSurface.getHolder();
                videoHolder.addCallback(this);

                player = new MediaPlayer();
                controller = new VideoControllerView(this);

                try {
                    player.setAudioStreamType(AudioManager.STREAM_MUSIC);
                    player.setDataSource(this, Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
                    player.setOnPreparedListener(this);
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (IllegalStateException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override
            public boolean onTouchEvent(MotionEvent event) {
                controller.show();
                return false;
            }

            // Implement SurfaceHolder.Callback
            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }

            @Override
            public void surfaceCreated(SurfaceHolder holder) {
              player.setDisplay(holder);
              player.prepareAsync();
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {

            }
            // End SurfaceHolder.Callback

            // Implement MediaPlayer.OnPreparedListener
            @Override
            public void onPrepared(MediaPlayer mp) {
                controller.setMediaPlayer(this);
                controller.setAnchorView((FrameLayout) findViewById(R.id.videoSurfaceContainer));
                player.start();
            }
            // End MediaPlayer.OnPreparedListener

            // Implement VideoMediaController.MediaPlayerControl
            @Override
            public boolean canPause() {
                return true;
            }

            @Override
            public boolean canSeekBackward() {
                return true;
            }

            @Override
            public boolean canSeekForward() {
                return true;
            }

            @Override
            public int getBufferPercentage() {
                return 0;
            }

            @Override
            public int getCurrentPosition() {
                return player.getCurrentPosition();
            }

            @Override
            public int getDuration() {
                return player.getDuration();
            }

            @Override
            public boolean isPlaying() {
                return player.isPlaying();
            }

            @Override
            public void pause() {
                player.pause();
            }

            @Override
            public void seekTo(int i) {
                player.seekTo(i);
            }

            @Override
            public void start() {
                player.start();
            }



            @Override
        public boolean isFullScreen() {
            if(mFullScreen){
                Log.w("FullScreen", "--set icon full screen--");
                Log.w("curr",player.getCurrentPosition()+"");
            /*    ImageButton mFullscreenButton=(ImageButton)controller.findViewById(R.id.fullscreen);
                mFullscreenButton.setImageResource(R.drawable.ic_media_fullscreen_stretch);
               */ return false;
            }else{
                Log.w("FullScreen", "--set icon small full screen--");
                return true;
            }
        }

        @Override
        public void toggleFullScreen() {
            Log.w("FullScreen", "-----------------click toggleFullScreen-----------");
            setFullScreen(isFullScreen());

        }
        // End VideoMediaController.MediaPlayerControl

        public void setFullScreen(boolean fullScreen){
            fullScreen = false;

            if (mFullScreen)

            {
                Log.w("FullScreen", "-----------Set full screen SCREEN_ORIENTATION_LANDSCAPE------------");

                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                DisplayMetrics displaymetrics = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
                int height = displaymetrics.heightPixels;
                int width = displaymetrics.widthPixels;
                android.widget.FrameLayout.LayoutParams params = (android.widget.FrameLayout.LayoutParams) videoSurface.getLayoutParams();
                params.width = width;
                params.height=height;
                params.setMargins(0, 0, 0, 0);
                //set icon is full screen
                mFullScreen = fullScreen;
            }
            else{
                Log.w("FullScreen", "-----------Set small screen SCREEN_ORIENTATION_PORTRAIT------------");
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                DisplayMetrics displaymetrics = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
                final FrameLayout mFrame = (FrameLayout) findViewById(R.id.videoSurfaceContainer);
                // int height = displaymetrics.heightPixels;
                int height =225;//get height Frame Container video//mFrame.getHeight()
                int width =displaymetrics.widthPixels;
                android.widget.FrameLayout.LayoutParams params = (android.widget.FrameLayout.LayoutParams) videoSurface.getLayoutParams();
                params.width = width;
                params.height= height;
                params.setMargins(0, 0, 0, 0);
                //set icon is small screen
                mFullScreen = !fullScreen;
            }
        }
       @Override
       protected void onSaveInstanceState(Bundle estadoguardado){

           super.onSaveInstanceState(estadoguardado);
           if(player!=null){

               int pos=player.getCurrentPosition();
               estadoguardado.putInt("posicion", pos);
           }

       }

        @Override
        protected void onRestoreInstanceState(Bundle estadoguardado)
        {

            super.onRestoreInstanceState(estadoguardado);
            if(estadoguardado!=null && player!=null){
                int pos=estadoguardado.getInt("posicion");
                Log.w("position",pos+"");
                player.seekTo(pos);

            }

        }

        @Override
        public void onResume()
        {


            super.onResume();
            try {
                //reinicia
                Toast.makeText(this, "onResume2", Toast.LENGTH_SHORT).show();
                if (player == null)
                    player.setDataSource(this, Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
                player.seekTo(0);
                player.setLooping(true);
                player.start();
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }
        }
        @Override
        public void onPause()
        {
            super.onPause();
            Toast.makeText(this, "onPause2", Toast.LENGTH_SHORT).show();
            //LIBERA A MEDIA PLAYER
            if (player != null)
            {
                player.release();
                player = null;
            }

还有其他继承自FrameLayout的类

在应用程序运行时会出现一些崩溃问题

java.lang.IllegalStateException
            at android.media.MediaPlayer.prepareAsync(Native Method)
            at whizpool.videoplayerexample.VideoPlayerActivity.surfaceCreated(VideoPlayerActivity.java:70)
            at android.view.SurfaceView.updateWindow(SurfaceView.java:554)
            at android.view.SurfaceView.access$000(SurfaceView.java:81)
            at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:169)
            at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:693)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1762)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4666)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511   
10-12 10:00:48.726    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ Attempt to perform seekTo in wrong state: mPlayer=0x18332b8, mCurrentState=2
10-12 10:00:48.726    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ error (-38, 0)
10-12 10:00:48.727    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ start called in state 0
10-12 10:00:48.727    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ error (-38, 0)
10-12 10:00:48.738    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ Error (-38,0)
10-12 10:00:48.738    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ Error (-38,0)
10-12 10:00:48.885    2268-2268/whizpool.videoplayerexample E/MediaPlayer﹕ prepareAsync called in state 0

- humayoon siddique

我认为如果不是初始化代码的话，你应该在onResume()中添加代码..!! - AndiGeeky

意思是我取消了 onResume() 代码的注释..!! - humayoon siddique

жҳҜзҡ„пјҢиҜ·еҸ–ж¶ҲonResumeд»Јз Ғзҡ„жіЁйҮҠпјҒ - AndiGeeky

@Override public void onResume() {

super.onResume();
try {
    //重新开始
    Toast.makeText(this, "onResume2", Toast.LENGTH_SHORT).show();
    if (player == null)
        player.setDataSource(this, Uri.parse("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4"));
    player.seekTo(0);
    player.setLooping(true);
    player.start();
}
catch(Exception e)
{
    e.printStackTrace();
}

} 当我添加这段代码后，我的应用程序崩溃了，它会给出下一个评论中的错误。 - humayoon siddique

在android.media.MediaPlayer.prepareAsync(Native Method)处在whizpool.videoplayerexample.VideoPlayerActivity.surfaceCreated(VideoPlayerActivity.java:70)处在android.view.SurfaceView.updateWindow(SurfaceView.java:554)处在android.view.SurfaceView.access$000(SurfaceView.java:81)处在android.view.SurfaceView$3.onPreDraw(SurfaceView.java:169)处在android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:693)处在android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1762)处 - humayoon siddique

删除这个注释并将其添加到您编辑的问题中，以便其他人也可以看到..!! - AndiGeeky

2个回答

0

为了在旋转时保存和恢复视频位置，您需要利用onSaveInstanceState和onRestoreInstanceState。您可以使用以下代码从VideoView中保存视频位置。

 @Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    VideoView videoView = (VideoView) findViewById(R.id.videoView);
    videoPosition = videoView.getCurrentPosition();
    if (videoView.canPause()) {
        videoView.pause();
    }

    outState.putInt(VIDEO_POSITION_KEY, videoPosition);
    Log.d(LOG_TAG, "onSaveInstanceState() Current Position Saved is: " + videoPosition);
}

...并使用此代码检索它。

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    videoPosition = savedInstanceState.getInt(VIDEO_POSITION_KEY, 0);
    VideoView videoView = (VideoView) findViewById(R.id.videoView);
    Log.d(LOG_TAG, "onRestoreInstanceState() - Seeking to position:" + Integer.toString(videoPosition));
    videoView.seekTo(videoPosition); // this call should keep the video at the saved position
}

- vguzzi

我正在使用SurfaceView而不是代码中提到的VideoView，并尝试了这段代码但失败了。 - humayoon siddique

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可以查看英文原文，
原文链接

- Usman Nisar · Accepted Answer

几秒钟后，您需要将屏幕方向重置为SCREEN_ORIENTATION_SENSOR，以便传感器重新开始工作。

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

new Handler().postDelayed(new Runnable() {
    @Override
    public void run() {

        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);

    }
}, 2000);