getActivity() had returned null when isDetached() had returned false
android, android-activity, fragment
Solution
Not 100% sure on this, but according to the Android docs, isDetached() will only return true if a `Fragment` has been explicitly detached from its `Activity`. There are several other reasons a `Fragment`'s parent Activity could be null, though. It might be best to instead call `isAdded` to check if the `Fragment` is currently attach to its `Activity`
Problem
Once upon a time my debugger hit the breakpoint on Log.d: ``` @Override public void onDataChanged(DataTypeChanged dataType) { if (!isDetached()) { if(getActivity()==null){ Log.d(CommonConstants.DEBUG_TAG, "Yes, it is null."); } List<WeekViewCoreTask> tasks = DataProvider .getWeekViewCoreTasks(getActivity().getApplicationContext()); mWeekView.setTasks(tasks); } } ``` I thought this never could occur. How this could occur: getActivity() had returned null when isDetached() had returned false?