媒體播放器拋出異常

我正在開發一個Android媒體播放器流媒體應用程序。我得到以下異常：媒體播放器拋出異常

12-11 11:12:06.298: INFO/StagefrightPlayer(34): setDataSource('10.0.2.2\a.mp3') 
12-11 11:12:06.308: DEBUG/mp(618): starting 
12-11 11:12:06.308: ERROR/MediaPlayer(618): start called in state 4 
12-11 11:12:06.308: ERROR/MediaPlayer(618): error (-38, 0) 
12-11 11:12:06.328: ERROR/MediaPlayer(618): error (1, -2147483648) 
12-11 11:12:06.328: ERROR/MediaPlayer(618): Error (-38,0) 
12-11 11:12:06.409: ERROR/MediaPlayer(618): Error (1,-2147483648)

 String url = "10.0.2.2\\a.mp3"; // your URL here 
     MediaPlayer mediaPlayer = new MediaPlayer(); 
     mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC); 
     try { 
      mediaPlayer.setDataSource(url); 
     } catch (IllegalArgumentException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IllegalStateException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     try { 
      mediaPlayer.prepareAsync(); 
     } catch (IllegalStateException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     Log.d("mp","starting"); 
     mediaPlayer.start();

當使用mediaPlayer.prepare我收到以下錯誤信息：

12-11 12:08:42.367: ERROR/MediaPlayer(980): error (1, -2147483648) 
12-11 12:08:42.367: WARN/System.err(980): java.io.IOException: Prepare failed.: status=0x1 
12-11 12:08:42.378: WARN/System.err(980):  at android.media.MediaPlayer.prepare(Native Method) 
12-11 12:08:42.378: WARN/System.err(980):  at mobiledo.pjct.Voicesms.onCreate(Voicesms.java:52) 
12-11 12:08:42.387: WARN/System.err(980):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
12-11 12:08:42.387: WARN/System.err(980):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
12-11 12:08:42.387: WARN/System.err(980):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
12-11 12:08:42.387: WARN/System.err(980):  at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
12-11 12:08:42.387: WARN/System.err(980):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
12-11 12:08:42.387: WARN/System.err(980): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-11 12:08:42.418: WARN/System.err(980):  at android.os.Looper.loop(Looper.java:123) 
12-11 12:08:42.418: WARN/System.err(980):  at android.app.ActivityThread.main(ActivityThread.java:3683) 
12-11 12:08:42.418: WARN/System.err(980):  at java.lang.reflect.Method.invokeNative(Native Method) 
12-11 12:08:42.418: WARN/System.err(980):  at java.lang.reflect.Method.invoke(Method.java:507) 
12-11 12:08:42.418: WARN/System.err(980):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
12-11 12:08:42.418: WARN/System.err(980):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
12-11 12:08:42.418: WARN/System.err(980):  at dalvik.system.NativeStart.main(Native Method)

來源

2011-12-11 sajith

您異步準備MediaPlayer的實例，但之後打電話start因爲MediaPlayer還沒有準備好，所以這會導致異常。你應該註冊一個OnPreparedListener（你叫prepareAsync前），並在這個監聽通話start()：

mediaPlayer.setOnPreparedListener(new OnPreparedListener(){ 
    public void onPrepared(MediaPlayer mp) { 
     mp.start(); 
    } 
}); 
mediaPlayer.prepareAsync();

來源

2011-12-11 06:08:49 MByD

不工作表示錯誤 – sajith

十二月12日至11日：05：33.027：INFO/StagefrightPlayer（34）：的setDataSource（'10 .0.2.2 \ a.mp3 '） 12-11 12：05：33.047：錯誤/ MediaPlayer（867）：錯誤（1，-2147483648） 12-11 12：05：33.127：錯誤/ MediaPlayer（867）：錯誤（1，-2147483648） – sajith

@sajith - 請發佈完整的錯誤。另外，你是否刪除了對'mediaPlayer.start（）'的調用？ – MByD

調用.prepareAsync()移動玩家準備狀態，沒有準備的狀態。因此，無論打電話.prepare代替，或實現並註冊OnPreparedListener然後調用start()

來源

2011-12-11 06:10:36 vertti

媒體播放器拋出異常

回答

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