android spinner值不會阻止播放器

Question

任何人都知道爲什麼此代碼不會阻止播放器播放？

public void onItemSelected(AdapterView<?> parent, 
      View view, int pos, long id) { 

    if(pos == 1) { 

        if (aacPlayer != null) { 
         aacPlayer.stop(); 
         aacPlayer = null; 
        } 



    } 

     } 

我運行應用程序，當我選擇應該停止aacplayer微調的一定值時，我得到這個：

05-29 12:14:59.279: E/AACPlayer(1608): java.lang.NullPointerException 
05-29 12:14:59.279: E/AACPlayer(1608): at com.spoledge.aacplay.AACPlayerActivity.onItemSelected(AACPlayerActivity.java:380) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.widget.AdapterView.fireOnSelected(AdapterView.java:871) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.widget.AdapterView.access$200(AdapterView.java:42) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:837) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.os.Handler.handleCallback(Handler.java:587) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.os.Handler.dispatchMessage(Handler.java:92) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.os.Looper.loop(Looper.java:123) 
05-29 12:14:59.279: E/AACPlayer(1608): at android.app.ActivityThread.main(ActivityThread.java:3683) 
05-29 12:14:59.279: E/AACPlayer(1608): at java.lang.reflect.Method.invokeNative(Native Method) 
05-29 12:14:59.279: E/AACPlayer(1608): at java.lang.reflect.Method.invoke(Method.java:507) 
05-29 12:14:59.279: E/AACPlayer(1608): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
05-29 12:14:59.279: E/AACPlayer(1608): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
05-29 12:14:59.279: E/AACPlayer(1608): at dalvik.system.NativeStart.main(Native Method) 

Answer 1

嗯，我想「POS」變量是永遠1 ？

請嘗試刪除它。