Android Espresso - Click checkbox if not checked

Question

I have onView(withId(R.id.check_box)).perform(click()), but i only want to do this if the check box is not already checked. How can I do this in espresso?

Answer 1

I had the same problem an wrote an own ViewAction that always unchecks my SwitchCompat

class UncheckViewAction implements ViewAction{

    @Override
    public Matcher getConstraints() {
        return new Matcher() {
            @Override
            public boolean matches(Object item) {
                return isA(SwitchCompat.class).matches(item);
            }

            @Override
            public void describeMismatch(Object item, Description mismatchDescription) {

            }

            @Override
            public void _dont_implement_Matcher___instead_extend_BaseMatcher_() {

            }

            @Override
            public void describeTo(Description description) {

            }
        };
    }

    @Override
    public String getDescription() {
        return null;
    }

    @Override
    public void perform(UiController uiController, View view) {
        SwitchCompat scView = (SwitchCompat) view;
        scView.setChecked(false);
    }
}

and used it like this:

onView(withId(R.id.check_box)).perform(new UncheckViewAction())

now i can be sure that the found switch is always unchecked, no matter if it was checked or unchecked before.