java - Exoplayer - 在 fragment 内旋转时保存和恢复状态

Question

我有一个托管 SimpleExoplayer 的 fragment 。我想确保我正确处理屏幕旋转。现在，播放器会在屏幕旋转时重置到开头。我已经在 onStart() 和 onResume() 中实现了方法，所以我很好奇我还需要哪些额外的代码:

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.fragment_recipe_details_three, container,false);

    ............

    mStepDescription.setText(step.getDescription());
    mVideoURL = step.getVideoURL();
    mSimpleExoPlayer = v.findViewById(R.id.exoplayer);
    mExoPlayerPlaceholder = v.findViewById(R.id.exoplayer_placeholder);
    if (mVideoURL == null || mVideoURL.isEmpty()){
        mSimpleExoPlayer.setVisibility(View.GONE);
        mExoPlayerPlaceholder.setVisibility(View.VISIBLE);
    }


    return v;
}

开始时:

    @Override
public void onStart() {
    super.onStart();
    initializePlayer();
}

暂停:

    @Override
public void onPause() {
    super.onPause();
    if (mExoPlayer!=null) {
        mExoPlayer.release();
        mExoPlayer = null;
    }
}

初始化:

private void initializePlayer(){
    // Create a default TrackSelector
    BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
    TrackSelection.Factory videoTrackSelectionFactory =
            new AdaptiveTrackSelection.Factory(bandwidthMeter);
    TrackSelector trackSelector =
            new DefaultTrackSelector(videoTrackSelectionFactory);

    //Initialize the player
    mExoPlayer = ExoPlayerFactory.newSimpleInstance(getContext(), trackSelector);
    mSimpleExoPlayer.setPlayer(mExoPlayer);


    // Produces DataSource instances through which media data is loaded.
    DataSource.Factory dataSourceFactory =
            new DefaultDataSourceFactory(getContext(), Util.getUserAgent(getContext(), "CloudinaryExoplayer"));

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



    // This is the MediaSource representing the media to be played.
    Uri videoUri = Uri.parse(mVideoURL);
    MediaSource videoSource = new ExtractorMediaSource(videoUri,
            dataSourceFactory, extractorsFactory, null, null);

    // Prepare the player with the source.
    mExoPlayer.prepare(videoSource);
}

Answer 1

我使用屏幕方向和 Exoplayer 来正确处理它，而无需破解任何东西或绕过它。据我所知，每次我尝试某件事时都会遇到障碍。

我猜最后一个是 View 需要几毫秒才能再次显示视频，播放器也需要几毫秒才能 catch 播放(有趣的是我的播放器是静态的并且使用应用程序上下文进行初始化)。

最后，我最终添加了 orientation 标记来显示。

现在旋转屏幕时非常流畅