[英]Release resources in PagerAdapter
我有一個 PagerAdapter,並在instantiateItem
中初始化一個ExoPlayer
。
我的問題是,如何釋放播放器?
我認為,應該以某種方式涉及 function destroyItem
,但destroyItem
僅將視圖視為 object。 如何釋放特定於PagerAdapter
的這一項目的資源?
這是我的來源,如果有人感興趣:
override fun instantiateItem(container: ViewGroup, position: Int): Any {
[...]
url.contains(mContext.getString(R.string.video_file_indicator)) -> {
val exoPlayer = ExoPlayerFactory.newSimpleInstance(mContext)
videoView.player = exoPlayer
val dataSourceFactory : DataSource.Factory = DefaultDataSourceFactory(mContext, Util.getUserAgent(mContext, mContext.getString(R.string.app_name)))
var videoSource : MediaSource = ProgressiveMediaSource.Factory(dataSourceFactory).createMediaSource(Uri.parse(url))
if (url == Helper.getUserProfile().profileVideoUrl) {
val localFile = File(mContext.getExternalFilesDir(null), Helper.profilePicVideoName)
videoSource = ProgressiveMediaSource.Factory(dataSourceFactory).createMediaSource(localFile.toUri())
}
exoPlayer.prepare(videoSource)
exoPlayer.playWhenReady = true
exoPlayer.repeatMode = Player.REPEAT_MODE_ONE
videoView.resizeMode = AspectRatioFrameLayout.RESIZE_MODE_ZOOM
}
}
container.addView(layout)
return layout
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
container.removeView(`object` as View)
}
您不需要從方法instantiateItem()
返回View
,您還可以返回包含ExoPlayer
和View
的包裝器。
例如
data class Wrapper(val view: View, val player: ExoPlayer)
在您的PagerAdapter
中:
override fun instantiateItem(container: ViewGroup, position: Int): Any {
[...]
return Wrapper(layout, exoPlayer)
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
val wrapper = `object` as Wrapper
container.removeView(wrapper.view)
// Release the player here.
wrapper.player.doSomething()
}
如果您想從instantiateItem()
返回一個視圖,您可以將ExoPlayer
指定為視圖的標簽,以便稍后檢索它。
例如
override fun instantiateItem(container: ViewGroup, position: Int): Any {
[...]
return layout.apply {
setTag(exoPlayer)
}
}
override fun destroyItem(container: ViewGroup, position: Int, `object`: Any) {
val view = `object` as View
container.removeView(view)
// Release the player here.
val exoPlayer = view.getTag() as ExoPlayer
exoPlayer.doSomething()
}
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