如何在exoplayer中停止在后台播放音频

Question

**

需要使用exoplayer在片段中实现视频流。流式传输工作正常但是当从片段活动移动到其他活动或者如果屏幕旋转时，相同音频的多个副本在后台持续播放，直到应用程序被杀死。如果处理这个，请帮忙。提前谢谢。

**

    public class VideoFragment extends Fragment {
    private SimpleExoPlayerView simpleExoPlayerView;
    public SimpleExoPlayer player;
    Uri mp4VideoUri;
    String TAG ="LOGG";
    SharedPrefs sharedPrefs;
    TextView notavailable;
    String url;
    Connection connection;
    long media_length;

    public VideoFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.video_fragment,container,false);
        sharedPrefs = new SharedPrefs(getContext());
        connection = new Connection(getContext());
        notavailable= (TextView) rootView.findViewById(R.id.videonotavailable);
        BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
        TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
        TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
        LoadControl loadControl = new DefaultLoadControl();
        player = ExoPlayerFactory.newSimpleInstance(getContext(), trackSelector, loadControl);
        simpleExoPlayerView = new SimpleExoPlayerView(getContext());
        simpleExoPlayerView = (SimpleExoPlayerView) rootView.findViewById(R.id.player_view);
        simpleExoPlayerView.setUseController(true);
        simpleExoPlayerView.requestFocus();
        simpleExoPlayerView.setPlayer(player);
        DefaultBandwidthMeter bandwidthMeterA = new DefaultBandwidthMeter();
        DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(getContext(), Util.getUserAgent(getContext(), "exoplayer2example"), bandwidthMeterA);
        ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();
        url=sharedPrefs.getvideoUrl();
        if (url==null || url.equals("")){
            simpleExoPlayerView.setVisibility(View.GONE);
            notavailable.setVisibility(View.VISIBLE);
        }else if (connection.isInternet()){
            mp4VideoUri=Uri.parse(sharedPrefs.getvideoUrl());
            MediaSource videoSource = new ExtractorMediaSource(mp4VideoUri,dataSourceFactory,extractorsFactory,null,null);
            final LoopingMediaSource loopingSource = new LoopingMediaSource(videoSource);

            player.prepare(loopingSource);

            player.addListener(new ExoPlayer.EventListener() {
                @Override
                public void onLoadingChanged(boolean isLoading) {
                    Log.v(TAG,"Listener-onLoadingChanged...");
                }

                @Override
                public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
                    Log.v(TAG,"Listener-onPlayerStateChanged...");
                }

                @Override
                public void onTimelineChanged(Timeline timeline, Object manifest) {
                    Log.v(TAG,"Listener-onTimelineChanged...");

                }

                @Override
                public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {

                }

                @Override
                public void onPlayerError(ExoPlaybackException error) {
                    Log.v(TAG,"Listener-onPlayerError...");
                    player.stop();
                }

                @Override
                public void onPositionDiscontinuity() {
                    Log.v("LOG","Listener-onPositionDiscontinuity...");

                }

                @Override
                public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {

                }
            });
            player.setPlayWhenReady(true);
        }else {
            simpleExoPlayerView.setVisibility(View.GONE);
            notavailable.setVisibility(View.VISIBLE);
            notavailable.setText(getString(R.string.nointernet));
        }
        return rootView;
    }

    @Override
    public void onPause() {
        super.onPause();
        if(player != null) {
            player.stop();
            player.release();
            media_length = player.getCurrentPosition();
        }
    }

    @Override
    public void onResume() {
        super.onResume();
        if(player != null) {
            player.seekTo(media_length);
            player.setPlayWhenReady(true);
        }
    }
}

Answer 1

在片段保持活动中，您需要使用@Override protected void onPause() { super.onPause(); mPlayerFragment.pause(); } 方法处理这种情况：

setPlayWhenReady()

您可以在片段中定义一个方法，通过将false传递给public void pausePlayback() { mExoPlayer.setPlayWhenReady(false); //pauses the playback if it's playing } 来暂停播放。

<?php
    $link = mysqli_connect("ip_address", "username", "password", "mysql")
    if (!$link) {
        echo "Error: Unable to connect to MySql" . PHP_EOL;    
        exit;
    }
    echo "Success: Connected to MySQL" . PHP_EOL;
    echo "Host Information: " . mysqli_get_host_info($link) . PHP_EOL;

    mysqli_close($link);
?>

Answer 2

在现有代码中实施以下代码后，我面临同样的问题并解决了问题

首先，您需要创建全局变量

 boolean isActivityRunning = false;

在onCreate()和活动的onResume（）中将此值设置为 true 。

如果值isActivityRunning为 true

，则需要设置Player

此后，您需要释放播放器并在isActivityRunning = false，onPause()和onStop()中设置onDestroy()，

 @Override
    public void onPause() {
        super.onPause();
        isActivityRunning = false;
        releasePlayer();
    }

    @Override
    public void onStop() {
        super.onStop();
        isActivityRunning = false;
        releasePlayer();
    }

 @Override
    public void onBackPressed() {
        super.onBackPressed();
        releasePlayer();
    }

  @Override
    protected void onDestroy(){
        super.onDestroy();
        releasePlayer();
    }

和releasePlayer()实现看起来像是

 SimpleExoPlayer player;
 PlayerView playerUI;

     private void releasePlayer(){
            if(player!=null){
                player.release();
                player.clearVideoSurface();
                playerUI.getPlayer().release();;
    
    
                player = null;
                playerUI =null;
            }
        }

其中播放器和播放器UI是需要设置 null

的全局变量

此解决方案对我来说很好。