Fragment Myfragment Not Attached to Activity

Fragment MyFragment not attached to Activity

I've found the very simple answer: isAdded():

Return true if the fragment is currently added to its activity.

@Override
protected void onPostExecute(Void result){
    if(isAdded()){
        getResources().getString(R.string.app_name);
    }
}

To avoid onPostExecute from being called when the Fragment is not attached to the Activity is to cancel the AsyncTask when pausing or stopping the Fragment. Then isAdded() would not be necessary anymore. However, it is advisable to keep this check in place.

java.lang.IllegalStateException: Fragment not attached to Activity

This error happens due to the combined effect of two factors:

• The HTTP request, when complete, invokes either onResponse() or onError() (which work on the main thread) without knowing whether the Activity is still in the foreground or not. If the Activity is gone (the user navigated elsewhere), getActivity() returns null.
• The Volley Response is expressed as an anonymous inner class, which implicitly holds a strong reference to the outer Activity class. This results in a classic memory leak.

To solve this problem, you should always do:

Activity activity = getActivity();
if(activity != null){

    // etc ...

}

and also, use isAdded() in the onError() method as well:

@Override
public void onError(VolleyError error) {

    Activity activity = getActivity(); 
    if(activity != null && isAdded())
        mProgressDialog.setVisibility(View.GONE);
        if (error instanceof NoConnectionError) {
           String errormsg = getResources().getString(R.string.no_internet_error_msg);
           Toast.makeText(activity, errormsg, Toast.LENGTH_LONG).show();
        }
    }
}

Android - Fragment not attached to activity

You have problem with the line

    pd.dismiss();

in onPostExecute of your GetUrlData. Put it inside if (isAdded ()) As per the answer of the question you reffered in your question. Your dialog uses the context of the activity.

EDIT

Add an if block in onPageSelected method that checks if Fragment if attached i.e.

@Override
public void onPageSelected(int position) {
    if(!isAdded ())
         return;

    for (int i = 0; i < dotsCount; i++) {
        dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));
    }
    if (position >= dotsCount) {
        dots[0].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
    } else {
        dots[position].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
    }
}

Fragment not attached to Activity while loading adapter

You are calling observe() with requireActivity() - your Activity's Lifecycle. That means you will continue to receive results until your Activity is stopped - i.e., it isn't tied to your Fragment's lifecycle at all, meaning it will continue to receive results even after your fragment is detached. You should never use requireActivity() with observe() in a Fragment.

Fragments have a special lifecycle specifically tied to when their views are created - getViewLifecycleOwner(). This is what you should be using for your observe:

shopViewModel.getDeptos().observe(getViewLifecycleOwner(), new Observer<Resource<List<Departamento>>>() {

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