Cannot resolve constructor ArrayAdapter

Replace this with activityName.this Change

listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);

with

listAdapter = new ArrayAdapter<String>(activityName.this, R.layout.simplerow, planetList);

This solved for me using in asyncTask.

Change

 listAdapter = new ArrayAdapter<String>(this, R.layout.simplerow, planetList);

to

 listAdapter = new ArrayAdapter<String>(getActivity(), R.layout.simplerow, planetList);

You can get Context in Fragment by using getActivity().

Try

import android.widget.ArrayAdapter;

This can as well solve the problem.