Android Espresso-如果未选中，请单击复选框 [英] Android Espresso - Click checkbox if not checked

问题描述

我有onView(withId(R.id.check_box)).perform(click())，但是我只想在尚未选中该复选框的情况下执行此操作.如何在浓缩咖啡中做到这一点?

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?

推荐答案

我还想根据其先前状态来切换复选框/开关.一开始，我尝试过此操作以打开一个已关闭的复选框:

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());

...这可以关闭一个已打开的复选框:

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

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

但是，这不起作用，因为Espresso将在执行操作之前先寻找特定的切换状态.有时，您事先不知道它是打开还是关闭.

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.

我的解决方案是使用自定义ViewAction来关闭/打开任何不依赖于先前状态的可检查对象(Switch，Checkbox等).因此，如果它已经打开，它将保持打开状态.如果关闭，它将切换为打开.这是ViewAction:

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);
        }
    };
}

这是您的用法(在此示例中，当您想切换到开"时):

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));

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