带有mediaplayer.setDataSource()的Firebae给出了一个错误

时间:2018-10-07 12:11:26

标签: java android kotlin

我正在尝试从Firebase获取url并将其提供给mediaplayer.setDataSource,但我得到一个错误提示:-`

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    max-width: 20% !important;
}

input native-input sc-ion-input-md {
    max-width: 20% !important;
}

这是我的代码:-

    java.lang.IllegalStateException
                      at android.media.MediaPlayer._setDataSource(Native Method)
                      at android.media.MediaPlayer.setDataSource(MediaPlayer.java:991)
                      at android.media.MediaPlayer.setDataSource(MediaPlayer.java:944)
                      at mks.master.musest.home$onCreateView$16$1$1.onDataChange(home.kt:425)
                      at com.firebase.client.core.ValueEventRegistration.fireEvent(ValueEventRegistration.java:45)
                      at com.firebase.client.core.view.DataEvent.fire(DataEvent.java:45)
                      at com.firebase.client.core.view.EventRaiser$1.run(EventRaiser.java:38)
                      at android.os.Handler.handleCallback(Handler.java:733)
                      at android.os.Handler.dispatchMessage(Handler.java:95)
                      at android.os.Looper.loop(Looper.java:136)
                      at android.app.ActivityThread.main(ActivityThread.java:5019)
                      at java.lang.reflect.Method.invokeNative(Native Method)
                      at java.lang.reflect.Method.invoke(Method.java:515)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
                      at dalvik.system.NativeStart.main(Native Method)
`

主要错误在这部分`var mediaplayer:MediaPlayeria mediaplayer=MediaPlayer() firebase= Firebase(link+"song2song") firebase.addValueEventListener(object:ValueEventListener{ override fun onCancelled(p0: FirebaseError?) { } override fun onDataChange(p0: DataSnapshot) { mediaplayer.setDataSource(p0.getValue(String()::class.java)) mediaplayer.prepareAsync() } })`

1 个答案:

答案 0 :(得分:0)

您应先致电reset(),然后再致电setDataSource()

在Android参考中查看以下state diagram,可以使您清楚地了解MediaPlayer的不同状态

另外This table显示setDataSource()只能从空闲状态执行。