getActionBar().setDisplayHomeAsUpEnabled(true) throws NullPointerException

Question

This question is asked several times in stackoverflow and I have tried all of them. But unfortunately neither is working for me.

I am trying to implement the naviga

Answer 1

import v7:

 import android.support.v7.app.ActionBar;

then in the onCreate method:

ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);