如何使用exoplayer播放m3u8，屏幕保持黑屏

<uses-permission android:name="android.permission.INTERNET" />

DefaultRenderersFactory renderersFactory = new DefaultRenderersFactory(context);
renderersFactory.setExtensionRendererMode(DefaultRenderersFactory.EXTENSION_RENDERER_MODE_PREFER);
SimpleExoPlayer player = new SimpleExoPlayer.Builder(context, renderersFactory).build();

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

String m3u8Url = "http://example.com/path/to/your/m3u8file.m3u8";
Uri uri = Uri.parse(m3u8Url);
MediaSource mediaSource = new HlsMediaSource.Factory(dataSourceFactory).createMediaSource(uri);
player.prepare(mediaSource);