Call activity methods

To run method in parent activity from onPostExecute of AsyncTask, include the activity in the constructor. Solution found in stackoverflow.

public class ConverterClass extends Activity
...
new AsyncNetworkConnection(this);
...
public void doPostAsyncWork() {

public class AsyncNetworkConnection extends AsyncTask
ConverterClass converterActivity;
...
//constructor used by converter
public AsyncNetworkConnection(ConverterClass convAct) {
...
protected void onPostExecute(String result) {
converterActivity.doPostAsyncWork();

To run method in parent activity from a fragment.

((ParentActivityName)getActivity()).methodName();