SimpleTask.java

package com.foo.bar;

import android.os.AsyncTask;
import android.util.Log;

public abstract class SimpleTask extends AsyncTask<Void, Void, Boolean> {

    private final AsyncTask waitTask;

    public SimpleTask(AsyncTask waitTask) {
        this.waitTask = waitTask;
    }

    public SimpleTask() {
        this(null);
    }

    abstract protected Boolean background();
    abstract protected void foreground();

    @Override
    protected Boolean doInBackground(Void... voids) {
        if(waitTask != null) {
            try {
                waitTask.get();
            } catch (Exception e) {
                Log.d("telephone_game", e.toString());
            }
        }

        return background();
    }

    @Override
    protected void onPostExecute(Boolean success) {
        if(success)
            foreground();
    }
}