当多个处于层次结构中时，Espresso匹配找到的第一个元素

问题描述

我正在尝试编写一个espresso函数以匹配espresso根据我的函数找到的第一个元素，即使找到了多个匹配项也是如此.

I'm trying to write an espresso function to match the first element espresso finds according to my function, even when multiple matching items are found.

例如:我有一个列表视图，其中包含包含项目价格的单元格.我希望能够将货币切换为加拿大元，并确认商品价格为加元.

Ex:I have a list view with cells which contain item price. I want to be able to switch the currency to Canadian dollars and verify item prices are in CAD.

我正在使用此功能:

    onView(anyOf(withId(R.id.product_price), withText(endsWith("CAD"))))
        .check(matches(
                isDisplayed()));

这将引发AmbiguousViewMatcherException.

This throws the AmbiguousViewMatcherException.

在这种情况下，我不在乎有多少个单元格显示CAD，我只想验证它是否显示.一旦遇到符合参数的对象，有没有办法使浓缩咖啡通过此测试?

In this case, I don't care how many or few cells display CAD, I just want to verify it is displayed. Is there way to make espresso pass this test as soon as it encounters an object meeting the parameters?

推荐答案

您应该能够使用以下代码创建仅与第一项匹配的自定义匹配器:

You should be able to create a custom matcher that only matches on the first item with the following code:

private <T> Matcher<T> first(final Matcher<T> matcher) {
    return new BaseMatcher<T>() {
        boolean isFirst = true;

        @Override
        public boolean matches(final Object item) {
            if (isFirst && matcher.matches(item)) {
                isFirst = false;
                return true;
            }

            return false;
        }

        @Override
        public void describeTo(final Description description) {
            description.appendText("should return first matching item");
        }
    };
}

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