使用Espresso和Hamcrest,如何计算recyclerView中可用项的数量?
例如:我想检查特定的RecyclerView是否显示了5个项目(必要时滚动)。
使用Espresso和Hamcrest,如何计算recyclerView中可用项的数量?
例如:我想检查特定的RecyclerView是否显示了5个项目(必要时滚动)。
这里是一个检查RecyclerView项目数量的示例ViewAssertion
public class RecyclerViewItemCountAssertion implements ViewAssertion {
private final int expectedCount;
public RecyclerViewItemCountAssertion(int expectedCount) {
this.expectedCount = expectedCount;
}
@Override
public void check(View view, NoMatchingViewException noViewFoundException) {
if (noViewFoundException != null) {
throw noViewFoundException;
}
RecyclerView recyclerView = (RecyclerView) view;
RecyclerView.Adapter adapter = recyclerView.getAdapter();
assertThat(adapter.getItemCount(), is(expectedCount));
}
}
然后使用这个断言
onView(withId(R.id.recyclerView)).check(new RecyclerViewItemCountAssertion(5));
我已经开始编写一个库,旨在通过Espresso和UIAutomator使测试更加简单。这包括用于RecyclerView操作和断言的工具。 https://github.com/nenick/espresso-macchiato 例如,查看具有方法assertItemCountIs(int)的EspRecyclerView。
在@Stephane的回答中添加一些语法糖。
public class RecyclerViewItemCountAssertion implements ViewAssertion {
private final Matcher<Integer> matcher;
public static RecyclerViewItemCountAssertion withItemCount(int expectedCount) {
return withItemCount(is(expectedCount));
}
public static RecyclerViewItemCountAssertion withItemCount(Matcher<Integer> matcher) {
return new RecyclerViewItemCountAssertion(matcher);
}
private RecyclerViewItemCountAssertion(Matcher<Integer> matcher) {
this.matcher = matcher;
}
@Override
public void check(View view, NoMatchingViewException noViewFoundException) {
if (noViewFoundException != null) {
throw noViewFoundException;
}
RecyclerView recyclerView = (RecyclerView) view;
RecyclerView.Adapter adapter = recyclerView.getAdapter();
assertThat(adapter.getItemCount(), matcher);
}
}
使用方法:
import static your.package.RecyclerViewItemCountAssertion.withItemCount;
onView(withId(R.id.recyclerView)).check(withItemCount(5));
onView(withId(R.id.recyclerView)).check(withItemCount(greaterThan(5)));
onView(withId(R.id.recyclerView)).check(withItemCount(lessThan(5)));
// ...
public class RecyclerViewItemCountAssertion implements ViewAssertion {
private final Matcher<Integer> matcher;
public RecyclerViewItemCountAssertion(int expectedCount) {
this.matcher = is(expectedCount);
}
public RecyclerViewItemCountAssertion(Matcher<Integer> matcher) {
this.matcher = matcher;
}
@Override
public void check(View view, NoMatchingViewException noViewFoundException) {
if (noViewFoundException != null) {
throw noViewFoundException;
}
RecyclerView recyclerView = (RecyclerView) view;
RecyclerView.Adapter adapter = recyclerView.getAdapter();
assertThat(adapter.getItemCount(), matcher);
}
}
使用方法:
onView(withId(R.id.recyclerView)).check(new RecyclerViewItemCountAssertion(5));
onView(withId(R.id.recyclerView)).check(new RecyclerViewItemCountAssertion(greaterThan(5));
onView(withId(R.id.recyclerView)).check(new RecyclerViewItemCountAssertion(lessThan(5));
// ...
经过验证的答案可行,但我们可以用一行代码解决这个问题,并且不需要适配器意识:
Validated answer works but we can solve this problem with one line and without adapter awareness :onView(withId(R.id.your_recycler_view_id)).check(matches(hasChildCount(2)))
将your_recycler_view_id
替换为您的id,将2
替换为要断言的数字。
hasChildCount(int)
。 - A. K. M. Tariqul Islamandroidx.test.espresso.matcher.ViewMatchers.hasChildCount
。 - DamienLgetItemCount()
),还是指当前在RecyclerView中回收的视图数量? - Michael OsofskygetItemCount()
。因此,只有在您可以拥有有限数量的项目并且不在所有设备上时,此解决方案才是可行的。 - DamienL基于 @Sivakumar Kamichetty 的回答:
COUNT = 0;
COUNT
转移为一个元素数组。result
是不必要的。虽然不太好看,但能运行:
public static int getCountFromRecyclerView(@IdRes int RecyclerViewId) {
final int[] COUNT = {0};
Matcher matcher = new TypeSafeMatcher<View>() {
@Override
protected boolean matchesSafely(View item) {
COUNT[0] = ((RecyclerView) item).getAdapter().getItemCount();
return true;
}
@Override
public void describeTo(Description description) {}
};
onView(allOf(withId(RecyclerViewId),isDisplayed())).check(matches(matcher));
return COUNT[0];
}
BoundedMatcher
:object RecyclerViewMatchers {
@JvmStatic
fun hasItemCount(itemCount: Int): Matcher<View> {
return object : BoundedMatcher<View, RecyclerView>(
RecyclerView::class.java) {
override fun describeTo(description: Description) {
description.appendText("has $itemCount items")
}
override fun matchesSafely(view: RecyclerView): Boolean {
return view.adapter.itemCount == itemCount
}
}
}
}
然后像这样使用:
onView(withId(R.id.recycler_view)).check(matches((hasItemCount(5))))
public static int getCountFromRecyclerView(@IdRes int RecyclerViewId) {
int COUNT = 0;
Matcher matcher = new TypeSafeMatcher<View>() {
@Override
protected boolean matchesSafely(View item) {
COUNT = ((RecyclerView) item).getAdapter().getItemCount();
return true;
}
@Override
public void describeTo(Description description) {
}
};
onView(allOf(withId(RecyclerViewId),isDisplayed())).check(matches(matcher));
int result = COUNT;
COUNT = 0;
return result;
}
使用方法 -
int itemsCount = getCountFromRecyclerView(R.id.RecyclerViewId);
然后执行断言以检查itemsCount是否符合预期
使用ActivityScenarioRule进行计数
@get: Rule
val activityScenarioRule = ActivityScenarioRule(ShowListActivity::class.java)
@Test
fun testItemCount(){
activityScenarioRule.scenario.onActivity { activityScenarioRule ->
val recyclerView = activityScenarioRule.findViewById<RecyclerView(R.id.movieListRecyclerView)
val itemCount = recyclerView.adapter?.itemCount?:0
....
}
}