Question

When I run my app in landscape mode it has no issues nor does it have any issues in portrait mode until i try to add an item to one of my lists while still in portrait mode, where of which my app crashes.

any ideas on how to fix this??

here is the error I am getting as feedback in logcat….

03-08 13:30:50.201: D/AndroidRuntime(554): Shutting down VM
03-08 13:30:50.201: W/dalvikvm(554): threadid=1: thread exiting with uncaught exception (group=0x40014760)
03-08 13:30:50.229: E/AndroidRuntime(554): FATAL EXCEPTION: main
03-08 13:30:50.229: E/AndroidRuntime(554): java.lang.RuntimeException: Unable to start activity  ComponentInfo{com.ATG.C3FactSystemTabbed/com.ATG.EditActivities.AmenitiesEditActivity}: java.lang.NullPointerException
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1748)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1764)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.ActivityThread.access$1500(ActivityThread.java:122)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1002)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.os.Handler.dispatchMessage(Handler.java:99)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.os.Looper.loop(Looper.java:132)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.ActivityThread.main(ActivityThread.java:4025)
03-08 13:30:50.229: E/AndroidRuntime(554):  at java.lang.reflect.Method.invokeNative(Native Method)
03-08 13:30:50.229: E/AndroidRuntime(554):  at java.lang.reflect.Method.invoke(Method.java:491)
03-08 13:30:50.229: E/AndroidRuntime(554):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
03-08 13:30:50.229: E/AndroidRuntime(554):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
03-08 13:30:50.229: E/AndroidRuntime(554):  at dalvik.system.NativeStart.main(Native Method)
03-08 13:30:50.229: E/AndroidRuntime(554): Caused by: java.lang.NullPointerException
03-08 13:30:50.229: E/AndroidRuntime(554):  at com.ATG.EditActivities.AmenitiesEditActivity.registerButtonListenersAndSetDefaultText(AmenitiesEditActivity.java:68)
03-08 13:30:50.229: E/AndroidRuntime(554):  at com.ATG.EditActivities.AmenitiesEditActivity.onCreate(AmenitiesEditActivity.java:61)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
03-08 13:30:50.229: E/AndroidRuntime(554):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1712)
03-08 13:30:50.229: E/AndroidRuntime(554):  ... 11 more

this is the line that throws the exception

btnSave.setOnClickListener(new View.OnClickListener(){      <-------
        @Override
        public void onClick(View v){
         . . . . . 
        }
  });

this is only thrown when I am in portrait mode, it never gets thrown unless i change the orientation before trying to add something to the list. And if i already have the view open to add something no matter how i change the orientation it won’t force close.

okay so i checked the files again i had different names for the buttons i was referencing in different xml files. In other words in landscape i was calling the button btnSave and in the other i was calling it btnAmenitiesSave. Problem solved thanks everyone!!!!!!

Answer 1

btnSave is set to null in portrait.

It means :

• btnSave is not assigned ( no btnSave = findViewById(....) )
• or the id the_id specified in btnSave = findViewById(R.id.the_id) does not exist in the portait layout