将 ExoPlayer 从 2.11.8 升级到 2.12.1 并更换过时的组件后，我无法播放任何视频

Question

I've recently upgraded com.google.android.exoplayer:exoplayer-core from version 2.11.8 to version 2.12.1.
Some components are deprecated by version 2.12.1 in the following code snippet.

        cacheEvictor = LeastRecentlyUsedCacheEvictor(CACHE_SIZE_MAX)
        databaseProvider = ExoDatabaseProvider(context)
        cache = SimpleCache(File(context.cacheDir, CACHE_DIR),
                cacheEvictor, databaseProvider)
        upstreamFactory = DefaultDataSourceFactory(context, USER_AGENT)
        // CacheDataSourceFactory class is deprecated
        cacheFactory = CacheDataSourceFactory(cache, upstreamFactory,
                CacheDataSource.FLAG_BLOCK_ON_CACHE or
                        CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR)
        mediaSourceFactory = ProgressiveMediaSource.Factory(cacheFactory)
        [...]
        val url: Uri
        val player: SimpleExoPlayer
        [...]
        // createMediaSource method is deprecated
        val mediaSource = mediaSourceFactory.createMediaSource(uri)
        // prepare method is deprecated
        player.prepare(mediaSource, true, true)

Thus I replaced the deprecated components by the newest ones.

        cacheEvictor = LeastRecentlyUsedCacheEvictor(CACHE_SIZE_MAX)
        databaseProvider = ExoDatabaseProvider(context)
        cache = SimpleCache(File(context.cacheDir, CACHE_DIR),
                cacheEvictor, databaseProvider)
        upstreamFactory = DefaultDataSourceFactory(context, USER_AGENT)
        cacheFactory = CacheDataSource.Factory().apply {
              setCache(this@VideoPlayer.cache)
              setUpstreamDataSourceFactory(upstreamFactory)
              setFlags(CacheDataSource.FLAG_BLOCK_ON_CACHE or                  
                    CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR)
        }
        mediaSourceFactory = ProgressiveMediaSource.Factory(cacheFactory)
        [...]
        val url: Uri
        val player: SimpleExoPlayer
        [...]
        val mediaItem =  MediaItem.fromUri(uri)
        val mediaSource = mediaSourceFactory.createMediaSource(mediaItem)
        player.setMediaSource(mediaSource, true)
        // The following missed
        player.prepare(mediaSource)

After the updates, the player was black and I could not play any video (nothing usefull in Logcat). I've returned to the deprecated components (still with version 2.12.1) and now I can play every video.

I think I messed up something when in replacing the deprecated components.
Can anyone help me, please?

Answer 1

I've just fixed the code in the answer: I had forgotten the last player.prepare() .
Now it works fine.