How to fix getActionBar method may produce java.lang.NullPointerException

Question

I am using a toolbar as my actionbar in an activity. I am trying to add the method getActionBar().setDisplayHomeAsUpEnabled(true); to the Activity.java file fo

Answer 1

  if(getSupportActionBar() != null){
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
    OR

Replace the MainActivity extends AppCompatActivity to public class MainActivity extends AppCompatActivity