云音乐-精选视频 | 二十I邊界

昨天没事又扫了一下，发现NeteaseCloudMusicApi有更新接口，还是视频的

精选视频添加起来还是很不错的，惊喜一，因为都是使用Kotlin已经不再使用Rxjava2了，在寻找定时触发替代品时发现了ticker，惊喜二，有钱就是了不起，播放在线不卡。。。我自己搭过阿里视频服务器4M宽带，播放时卡成狗

预览

netease_mlog
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实现设计

框架

精选视频的的实现是通过ViewPager2+SimpleExoPlayer实现的

将ViewPager2修改为纵向滑动

<androidx.viewpager2.widget.ViewPager2
    android:id="@+id/view_pager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" />

播放视频

private fun prepareVideoPlayer() {
  simplePlayer = SimpleExoPlayer.Builder(requireContext()).build()
  binding.playerView.player = simplePlayer

  val upstreamFactory = DefaultDataSourceFactory(requireContext(), HttpHeaders.USER_AGENT)
  cacheDataSourceFactory = CacheDataSource.Factory().apply {
    setCache(NeteaseApplication.simpleCache)
    setUpstreamDataSourceFactory(upstreamFactory)
    setFlags(
      CacheDataSource.FLAG_BLOCK_ON_CACHE or
        CacheDataSource.FLAG_IGNORE_CACHE_ON_ERROR
    )
  }
}

private fun prepareMedia(linkUrl: String) {
  val uri = Uri.parse(linkUrl)

  val mediaSource = ProgressiveMediaSource.Factory(cacheDataSourceFactory).createMediaSource(
    MediaItem.Builder().setUri(uri).setMimeType(MimeTypes.VIDEO_MP4).build()
  )

  simplePlayer.setMediaSource(mediaSource, true)
  simplePlayer.repeatMode = Player.REPEAT_MODE_ONE
  simplePlayer.playWhenReady = true
  simplePlayer.prepare()
  simplePlayer.addListener(playerCallback)

}

Slider

进度条更新采用ticker实现，很不错的方式，个人比较喜欢

初始化

  @ObsoleteCoroutinesApi
  private val tickerChannel = ticker(delayMillis = 300, initialDelayMillis = 0)

//  @ObsoleteCoroutinesApi
//  private fun tickCancel() {
//    tickerChannel.cancel()
//  }

调用

lifecycleScope.launch {
  for (event in tickerChannel) {
    if (simplePlayer.playWhenReady) {
      val position = simplePlayer.currentPosition * 1f
      if (progress.valueTo > position)
        progress.value = position
    }
  }

}

参考

https://stackoverflow.com/questions/54827455/how-to-implement-timer-with-kotlin-coroutines/54828055
https://codelabs.developers.google.com/codelabs/exoplayer-intro