戻るボタンでAndroidのアクティビティを破棄できませんでした。私のアクティビティから（終了ボタンを介して）終了すると、上記のエラーが発生したときに、戻るボタンでAndroidアクティビティを破棄できませんでした。

Question

03-26 16:16:38.623: E/AndroidRuntime(5079): FATAL EXCEPTION: main 
03-26 16:16:38.623: E/AndroidRuntime(5079): java.lang.RuntimeException: Unable to destroy activity {com.crack.Emobi/com.crack.Emobi.Main}: java.lang.NullPointerException 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3081) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3146) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.app.ActivityThread.access$2100(ActivityThread.java:132) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1071) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.os.Handler.dispatchMessage(Handler.java:99) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.os.Looper.loop(Looper.java:150) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.app.ActivityThread.main(ActivityThread.java:4263) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at java.lang.reflect.Method.invokeNative(Native Method) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at java.lang.reflect.Method.invoke(Method.java:507) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at dalvik.system.NativeStart.main(Native Method) 
03-26 16:16:38.623: E/AndroidRuntime(5079): Caused by: java.lang.NullPointerException 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at com.crack.Emobi.Main.onDestroy(Main.java:106) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3063) 
03-26 16:16:38.623: E/AndroidRuntime(5079):  ... 11 more 

何か助けていただければ幸いです。

Answer 1

あなたのonDestroy()方法でNullPointerExceptionを持っている：

03-26 16:16:38.623: E/AndroidRuntime(5079): Caused by: java.lang.NullPointerException 
03-26 16:16:38.623: E/AndroidRuntime(5079): at com.crack.Emobi.Main.onDestroy(Main.java:106)