【发布时间】：2023-07-17 21:24:01
【问题描述】：
我正在使用 ExoPlayer 播放视频。一切正常并且工作直到背压。我正在使用回收站视图。用户正在按下一个项目来输入视频。但是当用户按下并再次打开另一个视频或相同的视频时，播放器生成器会给出以下错误。我从未在网上看到过有关此问题的解决方案。而且我还需要说我在文档上使用了相同的构建器方法。
这是错误：
Process: com.example.exoplayer, PID: 19208
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/google/android/exoplayer2/source/ads/AdsMediaSource$MediaSourceFactory;
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:453)
at java.lang.Class.forName(Class.java:378)
at com.google.android.exoplayer2.source.DefaultMediaSourceFactory.loadDelegates(DefaultMediaSourceFactory.java:321)
at com.google.android.exoplayer2.source.DefaultMediaSourceFactory.<init>(DefaultMediaSourceFactory.java:152)
at com.google.android.exoplayer2.source.DefaultMediaSourceFactory.<init>(DefaultMediaSourceFactory.java:127)
at com.google.android.exoplayer2.SimpleExoPlayer$Builder.<init>(SimpleExoPlayer.java:195)
at com.google.android.exoplayer2.SimpleExoPlayer$Builder.<init>(SimpleExoPlayer.java:153)
at com.example.exoplayer.MainActivity.initializePlayer(MainActivity.kt:193)
at com.example.exoplayer.MainActivity.onStart(MainActivity.kt:70)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1333)
at android.app.Activity.performStart(Activity.java:6992)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2780)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.google.android.exoplayer2.source.ads.AdsMediaSource$MediaSourceFactory" on path: DexPathList[[zip file "/data/app/com.example.exoplayer-V2UiSJoFtK6lpPhAy-YB-g==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.exoplayer-V2UiSJoFtK6lpPhAy-YB-g==/lib/x86, /system/lib, /vendor/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
这是我的初始化和释放方法：
初始化()
private fun initializePlayerXml(currentXmlLink: String) {
if (player == null) {
val trackSelector = DefaultTrackSelector(this)
trackSelector.setParameters(
trackSelector.buildUponParameters().setMaxVideoSizeSd()
)
player = SimpleExoPlayer.Builder(this)
.setTrackSelector(trackSelector)
.build()
}
if (player!!.bufferedPosition == 0L) {
playButton.setImageResource(R.drawable.ic_pause)
}
playButton.setOnClickListener {
if (player!!.isPlaying) {
player!!.pause()
playButton.setImageResource(R.drawable.ic_play)
} else {
player!!.play()
playButton.setImageResource(R.drawable.ic_pause)
}
}
val doubleClickForwardFun = DoubleClick(object : DoubleClickListener {
override fun onSingleClickEvent(view: View?) {
}
override fun onDoubleClickEvent(view: View?) {
val currentPosition = player!!.currentPosition
player!!.seekTo(currentPosition + 10000)
}
})
val doubleClickBackwardFun = DoubleClick(object : DoubleClickListener {
override fun onSingleClickEvent(view: View?) {
}
override fun onDoubleClickEvent(view: View?) {
val currentPosition = player!!.currentPosition
player!!.seekTo(currentPosition - 10000)
}
})
forwardButton.setOnClickListener {
val currentPosition = player!!.currentPosition
player!!.seekTo(currentPosition + 10000)
}
backwardButton.setOnClickListener {
val currentPosition = player!!.currentPosition
player!!.seekTo(currentPosition - 10000)
}
doubleClickBackward.setOnClickListener(doubleClickBackwardFun)
doubleClickForward.setOnClickListener(doubleClickForwardFun)
val mediaItem =
MediaItem.Builder()
.setUri(currentXmlLink)
.setMimeType(MimeTypes.APPLICATION_MPD)
.build()
player!!.addMediaItem(mediaItem)
player!!.addMediaItem(mediaItem)
playerView!!.player = player
player!!.playWhenReady = playWhenReady
player!!.seekTo(currentWindow, playbackPosition)
playbackStateListener.let { player!!.addListener(it) }
player!!.prepare()
}
释放（）
private fun releasePlayer() {
if (player != null) {
player!!.removeListener(playbackStateListener)
player!!.release()
player!!.stop()
player = null
}
}
【问题讨论】：
标签： java android kotlin error-handling exoplayer