Android Exoplayer 只播放音频不播放视频

Question

我正在访问网络上的 mp4 文件 - 它在浏览器中运行良好，但由于某种原因，我似乎只能让音频部分在我的应用程序中工作。任何帮助，将不胜感激。

相关Gradle：

android {
    compileSdkVersion 28
        minSdkVersion 17
        targetSdkVersion 28

    compileOptions {
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation "com.android.support:support-compat:28.0.0"
    implementation "com.android.support:support-media-compat:28.0.0"
    implementation "com.google.android.exoplayer:exoplayer-core:2.7.2"
    implementation "com.google.android.exoplayer:exoplayer-ui:2.7.2"
}

布局视图：

<com.google.android.exoplayer2.ui.PlayerView
    android:id="@+id/playerView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginTop="0dp"
    android:layout_marginRight="0dp"
    app:layout_constraintRight_toRightOf="parent"
    android:layout_marginBottom="0dp"
    android:layout_marginLeft="0dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toTopOf="@+id/horizontalHalf"
     />

Fragment 中的相关代码：

private SimpleExoPlayer mExoPlayer;
private static MediaSessionCompat mMediaSession;
private PlaybackStateCompat.Builder mStateBuilder;



BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
TrackSelection.Factory videoTrackSelectionFactory =
                new AdaptiveTrackSelection.Factory(bandwidthMeter);
TrackSelector trackSelector =
                new DefaultTrackSelector(videoTrackSelectionFactory);
LoadControl loadControl = new DefaultLoadControl();
DefaultRenderersFactory renderersFactory = new DefaultRenderersFactory(mParentActivity);

mExoPlayer = ExoPlayerFactory.newSimpleInstance(renderersFactory, trackSelector, loadControl);
mPlayerView.setPlayer(mExoPlayer);

mExoPlayer.addListener(this);

DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(mParentActivity, "APP_NAME");
DefaultExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();

MediaSource mediaSource = new ExtractorMediaSource.Factory(dataSourceFactory).setExtractorsFactory(extractorsFactory).createMediaSource(mediaUri);

mExoPlayer.prepare(mediaSource);
mExoPlayer.setPlayWhenReady(true);

Answer 1

哦，天哪，这是一个奇怪的...所以事实证明，问题是设置应用程序的背景主题导致 exoplayer 显示被隐藏...

所以即使只是定义这个就足够了。如果我从这里删除背景，一切都会正常。不过，我仍然不知道如何既显示该视频又设置背景......

> <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
>     <!-- Customize your theme here. -->
>     <item name="android:background">@color/colorPrimary</item> </style>

我希望这里的内容能够帮助其他人将来避免这个问题。