getActionBar() returns null in PreferenceActivity (AppCompat-v7 21)

Question

I have implemented DoneBar (two buttons in actionbar) in PreferenceActivity as provided in v20 sdk samples, but after updating SDK and AppCompat to version 21 m

Answer 1

getActionBar() returns null in API 5.0 when i use Activity or FragmentActivity.

I solved this extendig to ActionBarActivity

public class MainActivity extends ActionBarActivity {

You must use getSupportActionBar() when you are using ActionBarActivity (appcompat-v7).