我遇到了你的問題,Skyler。
你是對的。文檔顯示mediaPlayer.reset()沒有無效狀態,但這不是文檔中的第一個不準確的地方。
我注意到VALID狀態列表並沒有說「Any」;它列出除了兩個以外的每個特定狀態:準備和結束。
我嘗試過,但在MediaPlayer希望處於準備狀態(使用prepareAsync())時嘗試調用release()時,不會引發IllegalStateException。我不能保證它不會發生,但我無法做到這一點。我確實看到了該實例是以下日誌消息:
04-11 11:41:54.740: E/MediaPlayer(4930): error (1, -2147483648)
04-11 11:41:54.748: E/MediaPlayer(4930): Error (1,-2147483648)
是,無論錯誤消息,一個右後外 - 一個用小寫的「錯誤」,一個大寫的「錯誤」,但沒有拋出異常。
但是,如果我在呼叫釋放後復位()(),然後我得到的錯誤:
04-11 11:45:05.232: E/AndroidRuntime(5046): FATAL EXCEPTION: main
04-11 11:45:05.232: E/AndroidRuntime(5046): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.helloandroid/com.android.helloandroid.HelloAndroidActivity}: java.lang.RuntimeException: java.lang.IllegalStateException
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1696)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1716)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.ActivityThread.access$1500(ActivityThread.java:124)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:968)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.os.Handler.dispatchMessage(Handler.java:99)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.os.Looper.loop(Looper.java:123)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.ActivityThread.main(ActivityThread.java:3806)
04-11 11:45:05.232: E/AndroidRuntime(5046): at java.lang.reflect.Method.invokeNative(Native Method)
04-11 11:45:05.232: E/AndroidRuntime(5046): at java.lang.reflect.Method.invoke(Method.java:507)
04-11 11:45:05.232: E/AndroidRuntime(5046): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-11 11:45:05.232: E/AndroidRuntime(5046): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-11 11:45:05.232: E/AndroidRuntime(5046): at dalvik.system.NativeStart.main(Native Method)
04-11 11:45:05.232: E/AndroidRuntime(5046): Caused by: java.lang.RuntimeException: java.lang.IllegalStateException
04-11 11:45:05.232: E/AndroidRuntime(5046): at com.android.helloandroid.HelloAndroidActivity.crashMediaPlayer(HelloAndroidActivity.java:423)
04-11 11:45:05.232: E/AndroidRuntime(5046): at com.android.helloandroid.HelloAndroidActivity.onCreate(HelloAndroidActivity.java:87)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1660)
04-11 11:45:05.232: E/AndroidRuntime(5046): ... 11 more
04-11 11:45:05.232: E/AndroidRuntime(5046): Caused by: java.lang.IllegalStateException
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.media.MediaPlayer._reset(Native Method)
04-11 11:45:05.232: E/AndroidRuntime(5046): at android.media.MediaPlayer.reset(MediaPlayer.java:1112)
04-11 11:45:05.232: E/AndroidRuntime(5046): at com.android.helloandroid.HelloAndroidActivity.crashMediaPlayer(HelloAndroidActivity.java:421)
04-11 11:45:05.232: E/AndroidRuntime(5046): ... 14 more
所以現代水墨的猜測是正確的。 MediaPlayer.reset()在End狀態(在調用release()後發生IllegalStateException)。在我的情況下,我發現我在onPause()上調用release(),但沒有在onResume()中再次初始化MediaPlayer。因此,當我調用reset()時它處於End狀態;
每http://developer.android.com/reference/android/media/MediaPlayer.html,
Once the MediaPlayer object is in the End state, it can no longer be used and there is no way to bring it back to any other state.
這意味着你需要從頭再來創建的MediaPlayer,從媒體播放器=新的MediaPlayer()或的mediaPlayer.onCreate()方法中的一種。或者當你調用release()的時候要小心。
嗯,它看起來像我與其他學科混淆'MediaPlayer'。抱歉混淆。 :) – Wroclai