java点击播放按钮，应用程序已停止，再次打开

Question

我正在创建带有hls播放列表和exo player的直播电视流媒体应用程序。 但当我点击播放按钮时，它停止了。请看代码并给我一个建议

下面是logcat上显示的错误，但我无法理解：

<com.google.安卓.exoplayer2.ui.PlayerView
    安卓:id="@+id/player_view"
    安卓:layout_width="match_parent"
    安卓:layout_height="match_parent"/>

二,。Java代码

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); //logcat indicate this line
    setContentView(R.layout.activity_streaming);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

    url = getIntent().getStringExtra("url");
    Uri videoUri = Uri.parse(url);


    BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
    TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
    TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

    // Create a default LoadControl
    LoadControl loadControl = new DefaultLoadControl();
    //Bis. Create a RenderFactory
    RenderersFactory renderersFactory = new DefaultRenderersFactory(this);

    //Create the player
    player = ExoPlayerFactory.newSimpleInstance(renderersFactory, trackSelector, loadControl);
    simpleExoPlayerView = new SimpleExoPlayerView(this);
    simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);


    //Set media controller
    simpleExoPlayerView.setUseController(true);
    simpleExoPlayerView.requestFocus();

    // Bind the player to the view.
    simpleExoPlayerView.setPlayer(player);

    //Measures bandwidth during playback. Can be null if not required.
    DefaultBandwidthMeter bandwidthMeterA = new DefaultBandwidthMeter();

    //Produces DataSource instances through which media data is loaded.
    DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "PiwikVideoApp"), bandwidthMeterA);

    //Produces Extractor instances for parsing the media data.
    ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();

    //FOR LIVE STREAM LINK:
    MediaSource videoSource = new HlsMediaSource(videoUri, dataSourceFactory, 1, null, null);
    final MediaSource mediaSource = videoSource;


    player.prepare(mediaSource);

}

}

Answer 1

若你们想在按下播放按钮时做些什么，你们必须按下按钮。SetOnClickListener方法。像这样：

final Button button = findViewById(R.id.button_id);
         button.setOnClickListener(new View.OnClickListener() {
             public void onClick(View v) {
                 // Code here executes on main thread after user presses button
             }
         });

关于这方面的更多信息，您可以find here.