Android MediaPlayer：啓動方法崩潰

我正在關注的新教程的教程，但是當我的代碼看起來與視頻中的人物看起來一樣時，它不起作用。Android MediaPlayer：啓動方法崩潰

public class Splash extends Activity{ 

MediaPlayer ourSong; 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.splash); 
    MediaPlayer.create(Splash.this, R.raw.splashsound); 
    ourSong.start(); 
    Thread timer = new Thread(){ 
     public void run(){ 
      try{ 
       sleep(5000); 
      } catch (InterruptedException e){ 
       e.printStackTrace(); 
      }finally{ 
       Intent openStartingPoint = new Intent("com.example.tutorial.STARTINGPOINT"); 
       startActivity(openStartingPoint); 
      } 
     } 
    }; 
    timer.start(); 
} 

@Override 
protected void onPause() { 
    // TODO Auto-generated method stub 
    super.onPause(); 
    //ourSong.release(); 
    finish(); 
    } 
}

我試圖把//涉及的MediaPlayer的每行前，然後一個接一個在取消他們，這看起來像程序崩潰，當它到達ourSong.start（）。

我不知道爲什麼會發生這種情況。有人能幫我嗎？

這裏的視頻：https://www.youtube.com/watch?v=-zGS_zrL0rY&index=17&list=PLEFA63803DBD4C83A

logcat的輸出：

04-16 16:40:18.964: I/art(1829): Background partial concurrent mark sweep GC freed 91(16KB) AllocSpace objects, 0(0B) LOS objects, 28% free, 10MB/14MB, paused 12.573ms total 114.113ms 

04-16 16:40:19.067: E/MediaPlayer(1829): Should have subtitle controller already set 

04-16 16:40:19.070: D/AndroidRuntime(1829): Shutting down VM 

04-16 16:40:19.090: E/AndroidRuntime(1829): FATAL EXCEPTION: main 

04-16 16:40:19.090: E/AndroidRuntime(1829): Process: com.example.tutorial, PID: 1829 

04-16 16:40:19.090: E/AndroidRuntime(1829): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tutorial/com.example.tutorial.Splash}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.ActivityThread.access$800(ActivityThread.java:151) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.os.Handler.dispatchMessage(Handler.java:102) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.os.Looper.loop(Looper.java:135) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.ActivityThread.main(ActivityThread.java:5257) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at java.lang.reflect.Method.invoke(Native Method) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at java.lang.reflect.Method.invoke(Method.java:372) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 

04-16 16:40:19.090: E/AndroidRuntime(1829): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.start()' on a null object reference 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at com.example.tutorial.Splash.onCreate(Splash.java:17) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.Activity.performCreate(Activity.java:5990) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 

04-16 16:40:19.090: E/AndroidRuntime(1829):  ... 10 more 

04-16 16:40:28.664: I/Process(1829): Sending signal. PID: 1829 SIG: 9

來源

2015-04-16 TempAcc

Post Logcat輸出。 –

將logcat添加到原始帖子。第一次使用logcat，所以我不確定我是否發佈了正確的東西。 – TempAcc

你的媒體播放器對象未初始化。它是空的！

ourSong = MediaPlayer.create（Splash.this，R.raw.splashsound）; ourSong.start（）;

來源

2015-04-16 16:50:17

該死的，你是對的！我現在覺得很蠢。謝謝！ – TempAcc

它發生在匆忙有時:) –

您尚未初始化您創建的MediaPlayer對象。它應該是

ourSong=MediaPlayer.create(Splash.this, R.raw.splashsound);

當前delared對象ourSong在調用start方法之前未初始化。

來源

2015-04-16 16:52:27 mayooran

Android MediaPlayer：啓動方法崩潰

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