小编Min*_*ina的帖子

我是新的Android ...当我按下后退按钮它给我下面的错误...12-01 11:10:07.952: E/AndroidRuntime(3171): FATAL EXCEPTION: main 12-01 11:10:07.952: E/AndroidRuntime(3171): java.lang.RuntimeException: Unable to destroy activity {com.example.IranNara/com.example.IranNara.FirstPage}: java.lang.NullPointerException 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3655) 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3673) 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.app.ActivityThread.access$2900(ActivityThread.java:125) 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2066) 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.os.Handler.dispatchMessage(Handler.java:99) 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.os.Looper.loop(Looper.java:123) 12-01 11:10:07.952: E/AndroidRuntime(3171): at android.app.ActivityThread.main(ActivityThread.java:4627) 12-01 11:10:07.952: E/AndroidRuntime(3171): at java.lang.reflect.Method.invokeNative(Native Method) 12-01 11:10:07.952: E/AndroidRuntime(3171): at java.lang.reflect.Method.invoke(Method.java:521) 12-01 11:10:07.952: E/AndroidRuntime(3171): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 12-01 11:10:07.952: E/AndroidRuntime(3171): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 12-01 11:10:07.952: E/AndroidRuntime(3171): at dalvik.system.NativeStart.main(Native Method) …