在設備上運行apk時出錯（Android）

Question

我不知道爲什麼應用程序只在進行設備調試時運行。當我嘗試在設備上使用應用程序時，該應用程序無法正常工作。我在下面顯示錯誤。

12-25 11:58:51.829: E/Trace(30281): error opening trace file: No such file or directory (2) 
12-25 11:58:52.354: E/AndroidRuntime(30281): FATAL EXCEPTION: main 
12-25 11:58:52.354: E/AndroidRuntime(30281): java.lang.RuntimeException: Unable to stop activity {com.example.menu/com.example.menu.MainActivity}: java.lang.NullPointerException 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3278) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3332) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3530) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread.access$700(ActivityThread.java:140) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1233) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.os.Looper.loop(Looper.java:137) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread.main(ActivityThread.java:4898) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at java.lang.reflect.Method.invokeNative(Native Method) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at java.lang.reflect.Method.invoke(Method.java:511) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at dalvik.system.NativeStart.main(Native Method) 
12-25 11:58:52.354: E/AndroidRuntime(30281): Caused by: java.lang.NullPointerException 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ContextImpl.stopService(ContextImpl.java:1319) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.content.ContextWrapper.stopService(ContextWrapper.java:395) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at com.example.menu.MainActivity.onStop(MainActivity.java:125) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1208) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.Activity.performStop(Activity.java:5322) 
12-25 11:58:52.354: E/AndroidRuntime(30281): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3273) 
12-25 11:58:52.354: E/AndroidRuntime(30281): ... 12 more 

的代碼是：

public class MainActivity extends Activity implements OnTouchListener, Runnable, OnSeekBarChangeListener { 

    private Intent svc; 
    private MediaPlayer mp; 
    private SeekBar sb; 
    private AudioManager am; 

    int Volume=0; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 

     setContentView(R.layout.splash); 

     mp = MediaPlayer.create(getBaseContext(), R.raw.spalshduck); 
     mp.start(); 

     Handler handler = new Handler(); 
     handler.postDelayed(this, 3000); 




    } 
    public void addListenerOnButton() { 

     ImageButton soundButton = (ImageButton) findViewById(R.id.sound); 
     soundButton.setOnTouchListener(this); 

    } 
    public boolean onTouch(View v, MotionEvent event) 
    { 

     switch (v.getId()) { 
     case R.id.sound: 
     { 
      setContentView(R.layout.soundview); 
      ImageButton soundButtonback = (ImageButton) findViewById(R.id.soundback); 

      sb =(SeekBar) findViewById(R.id.seekBar1); 

      am = (AudioManager) getSystemService(Context.AUDIO_SERVICE); 

      mp.start(); 

      int maxVolume = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC); 
      int curVolume = am.getStreamVolume(AudioManager.STREAM_MUSIC); 

      sb.setMax(maxVolume); 
      sb.setProgress(curVolume); 

      sb.setOnSeekBarChangeListener(this); 

      soundButtonback.setOnTouchListener(this); 


      break; 
     } 

     case R.id.soundback: 
     { 
      setContentView(R.layout.activity_main); 
      ImageButton soundButton = (ImageButton) findViewById(R.id.sound); 
      soundButton.setOnTouchListener(this); 
      break; 
     } 
     } 

     return true; 

    } 


    public void onProgressChanged(SeekBar seekb, int progress, boolean arg2) { 
     am.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0); 
     Volume = progress;  
    } 

    public void onStartTrackingTouch(SeekBar arg0) { 
     // TODO Auto-generated method stub 

    } 

    public void onStopTrackingTouch(SeekBar arg0) { 
     // TODO Auto-generated method stub 
     //Toast.makeText(getApplicationContext(), "Volume: " + Integer.toString(Volume), Toast.LENGTH_SHORT).show(); 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 

     return true; 
    } 

    public void finish() { 
     stopService(svc); 
     super.finish(); 
    } 

    public void onStop() { 
     stopService(svc); 
     super.onStop(); 



    } 

    @Override 
    public void run() { 


    setContentView(R.layout.activity_main); 


    svc=new Intent(this, MusicService.class); 
    startService(svc); 


    addListenerOnButton(); 
     // TODO Auto-generated method stub 

    } 
    @Override 
    public void onConfigurationChanged(Configuration newConfig) { 
     super.onConfigurationChanged(newConfig); 
     setContentView(R.layout.activity_main); 
    } 

} 

沒有IDEIA來解決這個問題:-(

Answer 1

的問題時，該活動已停止，因爲svc領域仍然null發生在你的代碼在run方法中應該可能進入onCreate方法。