咖啡计数元素 [英] Espresso count elements

问题描述

在Espresso中是否可以对具有特定ID的元素进行计数?

Is there a way to count elements with a certain id in Espresso?

我可以执行onView(withId(R.id.my_id))，但是我被卡住了.

I can do onView(withId(R.id.my_id)) but then I'm stuck.

我有一个LinearLayout，可以在其中注入元素(而不是ListView)，并且我想测试有多少个元素，以检查它们是否符合预期的行为.

I have a LinearLayout where I inject elements (not a ListView), and I want to test how many or those are to check whether they match expected behavior.

推荐答案

这是我想到的匹配器:

public static Matcher<View> withViewCount(final Matcher<View> viewMatcher, final int expectedCount) {
        return new TypeSafeMatcher<View>() {
            int actualCount = -1;

            @Override
            public void describeTo(Description description) {
                if (actualCount >= 0) {
                    description.appendText("With expected number of items: " + expectedCount);
                    description.appendText("\n With matcher: ");
                    viewMatcher.describeTo(description);
                    description.appendText("\n But got: " + actualCount);
                }
            }

            @Override
            protected boolean matchesSafely(View root) {
                actualCount = 0;
                Iterable<View> iterable = TreeIterables.breadthFirstViewTraversal(root);
                actualCount = Iterables.size(Iterables.filter(iterable, withMatcherPredicate(viewMatcher)));
                return actualCount == expectedCount;
            }
        };
    }

    private static Predicate<View> withMatcherPredicate(final Matcher<View> matcher) {
        return new Predicate<View>() {
            @Override
            public boolean apply(@Nullable View view) {
                return matcher.matches(view);
            }
        };
    }

，用法是:

onView(isRoot()).check(matches(withViewCount(withId(R.id.anything), 5)));

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