应用恢复时片段中的getActivity null

Question

So if the user is on my app and they click home and go to several other apps and then come back, then the activity will be recreated and getActivity will be null when I call on it in my fragment.

A solution I found was to create a static variable and store getActivity in the onCreateView .

I feel like this isn't a good solution. Is there any other way that I can go about this?

I tried using a non static variable and storing it in OncreateView and onAttach, but getActivity will be null.

Here is the error I will get when I use getActivity if I don't save it as a static variable. I use it in my AsyncTask for ProcessDialog in my Fragment.

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources$Theme android.content.Context.getTheme()' on a null object reference

Thanks.

Answer 1

If you are sure that onAttach(Activity activity) also has null, then I suspect you have multiple instance of same fragment at the same time. Print the fragment instance in onResume and check the instances.

Answer 2

Are you implementing the method onActivityCreated ? You should use getActivity inside this method.

Another workaround would be use onAttach to keep your Activity.

@Override
public void onAttach(Activity activity) {
 super.onAttach(activity);
 mActivity = activity;
}