Robolectric: actionBar.hide() returns Null
问题 I'm new to Android unit testing and I'm using Robolectric as a testing framework. I use Robolectric 2.2. I'm trying to test an activity which is like that : public class LoginActivity extends SherlockActivity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); ActionBar abs = getSupportActionBar(); abs.hide(); } and here's my test class : @RunWith(RobolectricTestRunner.class) public class LoginActivityTest