I am developing inteligent study application and I have any problem with restoring my Activity. Activity takes some data from database for the list and there are any other Views.
Now my problem – if I close (hide) this application in this situation (with Home button), run any other application (for example sending sms) and then when I go back to my running application there is big error. I don’t know where is the problem (debug not help). Please help.
Here is the error from Log:
11-04 16:03:58.270: ERROR/kernel(130): [115047.678649] init: untracked pid 1183 exited
11-04 16:04:12.660: ERROR/jdwp(1276): Failed sending reply to debugger: Broken pipe
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): FATAL EXCEPTION: main
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): java.lang.NullPointerException
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at cz.android.zkouseni.VyberLekce$AdapterVyberLekce.getView(VyberLekce.java:262)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.AbsListView.obtainView(AbsListView.java:1519)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.ListView.makeAndAddView(ListView.java:1749)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.ListView.fillDown(ListView.java:674)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.ListView.fillFromTop(ListView.java:731)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.ListView.layoutChildren(ListView.java:1602)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.AbsListView.onLayout(AbsListView.java:1349)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.view.View.layout(View.java:7320)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:912)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.view.View.layout(View.java:7320)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.FrameLayout.onLayout(FrameLayout.java:342)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.view.View.layout(View.java:7320)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.widget.FrameLayout.onLayout(FrameLayout.java:342)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.view.View.layout(View.java:7320)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.view.ViewRoot.performTraversals(ViewRoot.java:1162)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.view.ViewRoot.handleMessage(ViewRoot.java:1882)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.os.Handler.dispatchMessage(Handler.java:99)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.os.Looper.loop(Looper.java:130)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at android.app.ActivityThread.main(ActivityThread.java:3701)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at java.lang.reflect.Method.invokeNative(Native Method)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at java.lang.reflect.Method.invoke(Method.java:507)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
11-04 16:04:12.961: ERROR/AndroidRuntime(1276): at dalvik.system.NativeStart.main(Native Method)
11-04 16:06:51.880: ERROR/ServiceLocator(1412): ServiceLocator$VoipServiceConnection.onServiceConnected ext: android.os.BinderProxy@2b01c718
11-04 16:08:10.580: ERROR/ActivityThread(1506): Failed to find provider info for com.maxmpz.audioplayer
you are getting a NullPointerException in VyberLekce.java line 262, which maybe caused because you are not saving application state, and when app resumes it doesn’t find some variable
if that’s the case this Saving Android Activity state using Save Instance State might be helpful