Invoke ActionBar's Up button press from code

Question

I am writing an Android app with ActionBar enabled. In my case I use ActionBarSherlock to provide compatibility, but I think it doesn't matter in this case.

I have an Up button displaying at the left of ActionBar in my Activity. It appears after a call to setHomeAsUpEnabled(true); and it leads to the HomeActivity.

I want to write a test case which checks that Up button press leads to that HomeActivity. I am using Robotium to write tests on UI side so I can check the class of the current Activity by following assertion solo.assertCurrentActivity(HomeActivity.class); But I have not found a way to invoke a press on an Up button.

I've tried solo.clickOnView(solo.getView(android.R.id.home)) and getInstrumentation().invokeMenuActionSync(solo.getCurrentActivity(), android.R.id.home, 0); but none of them works.

Any help would be appreciated.

Answer 1

Found a workaround myself, so posting it here in case anybody will need this. This code worked for me:

public static void clickOnUpActionBarButton(Activity activity) {
        ActionMenuItem logoNavItem = new ActionMenuItem(activity, 0, android.R.id.home, 0, 0, "");
        ActionBarSherlockCompat absc = (ActionBarSherlockCompat) UiTestUtils.invokePrivateMethodWithoutParameters(
                SherlockFragmentActivity.class, "getSherlock", activity);
        absc.onMenuItemSelected(Window.FEATURE_OPTIONS_PANEL, logoNavItem);
    }

First you need to obtain ActionBarSherlockCompat object by calling getSherlock() on SherlockFragmentActivity. This method is protected, so I used Reflection API to call it:

public static Object invokePrivateMethodWithoutParameters(Class<?> clazz, String methodName, Object receiver) {
        Method method = null;
        try {
            method = clazz.getDeclaredMethod(methodName, (Class<?>[]) null);
        } catch (NoSuchMethodException e) {
            Log.e(TAG, e.getClass().getName() + ": " + methodName);
        }

        if (method != null) {
            method.setAccessible(true);

            try {
                return method.invoke(receiver, (Object[]) null);
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        }

        return null;
    }

You need to pass solo.getCurrentActivity() to my clickOnUpActionBarButton(Activity activity) method and Up button will be pressed.