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 also wanted to toggle a checkbox/switch depending on it's previous state. At first, I tried this to toggle ON a checkbox that was OFF:

onView(withId(R.id.checkbox)).check(matches(isNotChecked())).perform(scrollTo(), click());

...and this to toggle OFF a checkbox that was ON:

onView(withId(R.id.checkbox)).check(matches(isChecked())).perform(scrollTo(), click());

However, this doesn't work, since Espresso will be looking for a specific toggle state before it performs the action. Sometimes, you don't know whether it's ON or OFF beforehand.

My solution is to use a custom ViewAction to turn OFF/ON any checkable object (Switch, Checkbox, etc.) that isn't dependent on previous state. So, if it's already ON, it'll stay ON. If it's OFF, it'll toggle ON. Here's the ViewAction:

public static ViewAction setChecked(final boolean checked) {
    return new ViewAction() {
        @Override
        public BaseMatcher<View> getConstraints() {
            return new BaseMatcher<View>() {
                @Override
                public boolean matches(Object item) {
                    return isA(Checkable.class).matches(item);
                }

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

                @Override
                public void describeTo(Description description) {}
            };
        }

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

        @Override
        public void perform(UiController uiController, View view) {
            Checkable checkableView = (Checkable) view;
            checkableView.setChecked(checked);
        }
    };
}

And here's how you use it (in this example, when you want to toggle to ON):

onView(withId(R.id.toggle)).perform(scrollTo(), setChecked(true));