I have an Android test project in which I wish to programatically change the orientation.

My test:

public class MainActivityLandscapeTest extends ActivityInstrumentationTestCase2<MainActivity> {
public MainActivityLandscapeTest() {
    super(MainActivity.class);
}

private MainActivity mActivity;
private Fragment mDetailFragment;
private Fragment mListFragment;
private Solo mSolo;
@Override
protected void setUp() throws Exception {
    super.setUp();
    mSolo = new Solo(getInstrumentation(), getActivity());
    mSolo.setActivityOrientation(Solo.LANDSCAPE);
    mActivity = getActivity();
    mListFragment = (Fragment) mActivity.getSupportFragmentManager()
            .findFragmentById(R.id.listFragment);
    mDetailFragment = (Fragment) mActivity.getSupportFragmentManager()
            .findFragmentById(R.id.detailFragment);     
}

public void testPreConditions() {
    assertTrue(mActivity != null);
    assertTrue(mSolo != null);
    assertTrue(mListFragment != null);
    assertTrue(getActivity().getResources().getConfiguration().orientation == 
            Configuration.ORIENTATION_LANDSCAPE);
}

/**
 * Only show detailFragment in landscape mode
 */
public void testOrientation() {
    assertTrue(mListFragment.isVisible());
    assertTrue(mDetailFragment.isVisible());
}
}

The layouts for the activity is in seperate folders, layout-port and layout-land

• layout-port
  • fragment_main.xml
• layout-land
  • fragment_main.xml

In landscape mode, the layout contains 2 fragments (Detail and list) while in portrait it contains 1(List only).

If the device/emulator is already in landscape mode before testing begins, this test passes. If in portrait, it fails with a NullPointerException on mListFragment and mDetailFragment.

Adding a delay (waitForIdleSync() and/or waitForActivity()) did NOT seem to solve my problem.

How do i force the orientation to landscape in my test, while still being able to find the fragments using findFragmentById()?