Android App Reacts Properly To To Phone's Back Button But Crashes With Nulpointerexception When Clicked On Menu's Back Button

i have an activity (say A2) which gets an id from its parent activity (say A1) and after fetching results from database prepares a list. on clicking a list item it passes the anoth

Solution 1:

okay...so it worked out. i had to set the launchMode=singleTop property inside the manifest file for activity A2(allclasses) like below so that system keeps instance created for A2 activity alive in backstack

 android:launchMode="singleTop"

and then just call navUtils.navigateUpFromSameTask(this) method from activity A3 to call the same instance from the backstack instead of creating a new instance.

@OverridepublicbooleanonOptionsItemSelected(MenuItem menuItem) {
    switch (menuItem.getItemId()) {
    case android.R.id.home:
        NavUtils.navigateUpFromSameTask(this);
        returntrue;
    }
    returnsuper.onOptionsItemSelected(menuItem);
}

hmm...simple solution haa...:D ... Thanks guys for your help... !!

Solution 2:

Try getParentActivityIntent() instead of getParent()