You cannot start a load on a not yet attached View or a Fragment where getActivity() returns null

Question

I am using FragmentStatePagerAdapter to show around 5 fragments in an activity.On each activity I am showing the images which I am fetching from FirebaseListAdapter/Firebase

Answer 1

Your fragment is detached before response coming from firebase, So try to check getActivity() null before using that

public void onDataChange(DataSnapshot dataSnapshot) {
    if (getActivity() == null) {
        return;
    }
    Child child = dataSnapshot.getValue(Child.class);
    uname.setText(child.getUsername());
    Glide.with(getActivity()).load(child.getProfileImage()).into(profileImage);
}

You can do like to check activity is null or not in other place.

private Activity mActivity;

@Override
public void onAttach(Context context) {
    super.onAttach(context);

    mActivity = getActivity();
}

@Override
public void onDetach() {
    super.onDetach();
    mActivity = null;
}

private void doAction() {
    if (mActivity == null) {
        return;
    }

    adapt = new FirebaseListAdapter(mActivity, MyClassStudent.class, R.layout.mychild_grid_template, myRef) {
        @Override
        protected void populateView(final View v, MyClassStudent model, int position) {
            final TextView uname = (TextView) v.findViewById(R.id.mychild_uname);

            final CircleImageView profileImage = (CircleImageView) v.findViewById(R.id.mychild_image);
            studRef.child(model.getUsername()).addListenerForSingleValueEvent(new ValueEventListener() {
                public void onDataChange(DataSnapshot dataSnapshot) {
                    if (mActivity == null) {
                        return;
                    }
                    Child child = dataSnapshot.getValue(Child.class);
                    uname.setText(child.getUsername());
                    Glide.with(mActivity).load(child.getProfileImage()).into(profileImage);
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
        }
    };
}