Android - 切换 wifi 后，Exoplayer 无法离线下载答案

【问题标题】：Android - Exoplayer not playing offline download after toggling wifiAndroid - 切换 wifi 后，Exoplayer 无法离线下载
【发布时间】：2020-08-14 14:40:53
【问题描述】：

如果我在关闭 wifi 的情况下启动我的应用，离线下载的视频可以正常播放。

但在切换 wifi（打开，然后关闭）后，我现在在观看同一视频时会出现黑屏。只有错误信息：

E/ExoPlayerImplInternal: Source error.

有没有人遇到过类似的情况？

我如何获取 MediaSource 的代码：

SimpleCache sc = ...
DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(app, "exoplayer-test");
DefaultExtractorsFactory extractorsFactory = new DefaultExtractorsFactory().setConstantBitrateSeekingEnabled(true);
CacheDataSourceFactory cacheDataSourceFactory = new CacheDataSourceFactory(sc, dataSourceFactory, CacheDataSource.FLAG_BLOCK_ON_CACHE);
MediaSource mediaSource = new HlsMediaSource.Factory(cacheDataSourceFactory).createMediaSource(uri);

【问题讨论】：

标签： android http-live-streaming exoplayer exoplayer2.x

【解决方案1】：

当我设置 PlaylistParserFactory 时似乎已修复

mediaSource = new HlsMediaSource.Factory(cacheDataSourceFactory)
    .setPlaylistParserFactory(
        new FilteringHlsPlaylistParserFactory(
            new DefaultHlsPlaylistParserFactory(),
            Collections.singletonList(new StreamKey(HlsMasterPlaylist.GROUP_INDEX_VARIANT, 0))))
    .createMediaSource(uri);

我按照https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/source/hls/offline/HlsDownloader.html这里的说明下载了原视频

【讨论】：