안드로이드에서 에뮬레이터 회전 후 nullpointerexception

Question

이미지 편집 응용 프로그램을 사용하는 동안 에뮬레이터를 회전 할 때 위와 같은 문제가 발생합니다. nullpointerexception으로 충돌합니다. 다음은 문제와 관련된 코드 부분입니다.

HueseekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { 
      public void onProgressChanged(SeekBar arg0, int progress, 
       boolean fromUser) { 
      try { 
       if (picclass.hasBitmap()) { 
        float hue = (float) (progress - 256); 
        float setHue = (float) hue * 360/256; 
        picclass.setHue(setHue); 

        if (!noUpdate) { 
         picclass.ApplyFilter(); 
         Img.setImageBitmap(picclass.getDisplayedBitmap()); 
         mUndoRedo.SetStateForUndoRedo(); 
        } 
       } 
      } catch (OutOfMemoryError ome) { 
       AlertDialog ad = adb.create(); 
       ad.setMessage("Leider reicht der Speicherplatz nicht aus!"); 
       ad.show(); 

      } 
     } 

logcat에 따르면 문제는 mUndoRedo.SetStateForUndoRedo();입니다. 코드가 제대로 컴파일됩니다. 이 예외가 여기에서 어떻게 트리거되는지 이해할 수 없습니다. 어떤 아이디어?

편집 : 로그 캣

07-25 18:26:07.328: D/dalvikvm(5989): GC_CONCURRENT freed 159K, 3% free 9134K/9351K, paused 4ms+3ms 
07-25 18:26:07.348: D/TextLayoutCache(5989): Using debug level: 0 - Debug Enabled: 0 
07-25 18:26:07.428: D/libEGL(5989): loaded /system/lib/egl/libGLES_android.so 
07-25 18:26:07.428: D/libEGL(5989): loaded /system/lib/egl/libEGL_adreno200.so 
07-25 18:26:07.438: D/libEGL(5989): loaded /system/lib/egl/libGLESv1_CM_adreno200.so 
07-25 18:26:07.438: D/libEGL(5989): loaded /system/lib/egl/libGLESv2_adreno200.so 
07-25 18:26:07.478: D/OpenGLRenderer(5989): Enabling debug mode 0 
07-25 18:26:10.668: D/OpenGLRenderer(5989): Flushing caches (mode 0) 
07-25 18:26:10.688: D/OpenGLRenderer(5989): Flushing caches (mode 0) 
07-25 18:26:12.128: D/OpenGLRenderer(5989): Flushing caches (mode 1) 
07-25 18:26:15.518: I/System.out(5989): Image Path : /mnt/sdcard/tiny_sd/rocknest_858x188.jpg 
07-25 18:26:15.548: D/dalvikvm(5989): GC_FOR_ALLOC freed 102K, 2% free 9314K/9479K, paused 23ms 
07-25 18:26:15.548: I/dalvikvm-heap(5989): Grow heap (frag case) to 9.747MB for 645232-byte allocation 
07-25 18:26:15.598: D/dalvikvm(5989): GC_CONCURRENT freed 103K, 3% free 9841K/10119K, paused 5ms+2ms 
07-25 18:26:15.598: W/CursorWrapperInner(5989): Cursor finalized without prior close() 
07-25 18:26:17.538: D/OpenGLRenderer(5989): Flushing caches (mode 0) 
07-25 18:26:17.808: D/dalvikvm(5989): GC_FOR_ALLOC freed 86K, 3% free 9902K/10119K, paused 37ms 
07-25 18:26:17.808: I/dalvikvm-heap(5989): Grow heap (frag case) to 10.321MB for 645232-byte allocation 
07-25 18:26:17.878: D/dalvikvm(5989): GC_CONCURRENT freed 4K, 3% free 10528K/10759K, paused 2ms+2ms 
07-25 18:26:17.908: D/dalvikvm(5989): GC_FOR_ALLOC freed <1K, 3% free 10528K/10759K, paused 32ms 
07-25 18:26:17.908: I/dalvikvm-heap(5989): Grow heap (frag case) to 10.931MB for 645232-byte allocation 
07-25 18:26:17.978: D/dalvikvm(5989): GC_CONCURRENT freed 0K, 3% free 11158K/11399K, paused 5ms+2ms 
07-25 18:26:20.098: D/AndroidRuntime(5989): Shutting down VM 
07-25 18:26:20.098: W/dalvikvm(5989): threadid=1: thread exiting with uncaught exception (group=0x2b542210) 
07-25 18:26:20.108: E/AndroidRuntime(5989): FATAL EXCEPTION: main 
07-25 18:26:20.108: E/AndroidRuntime(5989): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.propra_fotoapp/com.example.propra_fotoapp.MainActivity}: java.lang.NullPointerException 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3371) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread.access$700(ActivityThread.java:127) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1162) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.os.Handler.dispatchMessage(Handler.java:99) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.os.Looper.loop(Looper.java:137) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread.main(ActivityThread.java:4441) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at dalvik.system.NativeStart.main(Native Method) 
07-25 18:26:20.108: E/AndroidRuntime(5989): Caused by: java.lang.NullPointerException 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at com.example.propra_fotoapp.MainActivity$13.onProgressChanged(MainActivity.java:269) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.widget.SeekBar.onProgressRefresh(SeekBar.java:89) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.widget.ProgressBar.doRefreshProgress(ProgressBar.java:609) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.widget.ProgressBar.refreshProgress(ProgressBar.java:621) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.widget.ProgressBar.setProgress(ProgressBar.java:670) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.widget.ProgressBar.setProgress(ProgressBar.java:651) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.widget.ProgressBar.onRestoreInstanceState(ProgressBar.java:1096) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.view.View.dispatchRestoreInstanceState(View.java:10043) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2425) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:2425) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.view.View.restoreHierarchyState(View.java:10021) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1619) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.Activity.onRestoreInstanceState(Activity.java:906) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.Activity.performRestoreInstanceState(Activity.java:878) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1100) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1945) 
07-25 18:26:20.108: E/AndroidRuntime(5989):  ... 12 more 
07-25 18:26:20.158: D/dalvikvm(5989): GC_CONCURRENT freed 1333K, 13% free 10551K/12039K, paused 2ms+2ms 
07-25 18:31:20.198: I/Process(5989): Sending signal. PID: 5989 SIG: 9 

Answer 1

액티비티가 삭제되기 전에 번들을 저장 한 다음 액티비티를 다시 만들 때 번들의 값을 설정해야합니다.

Answer 2

안드로이드 운영 체제가 유일하다. 화면을 회전 시키면 자동으로 새 활동을 작성하므로 null 참조가 생깁니다. 내 조언은 potrait 또는 landscape 화면을 설정하는 것입니다.