How to count RecyclerView items with Espresso
Solution 1
Here an example ViewAssertion to check RecyclerView item count
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));
}
}
and then use this assertion
onView(withId(R.id.recyclerView)).check(new RecyclerViewItemCountAssertion(5));
I have started to write an library which should make testing more simple with espresso and uiautomator. This includes tooling for RecyclerView action and assertions. https://github.com/nenick/espresso-macchiato See for example EspRecyclerView with the method assertItemCountIs(int)
Solution 2
Adding a bit of syntax sugar to the @Stephane's answer.
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);
}
}
Usage:
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)));
// ...
Solution 3
To complete nenick answer and provide and little bit more flexible solution to also test if item cout is greaterThan, lessThan ...
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);
}
}
Usage:
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));
// ...
Solution 4
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)))
Replace your_recycler_view_id
with your id and 2
with the number to assert.
Solution 5
Based on @Sivakumar Kamichetty answer:
- Variable 'COUNT' is accessed from within inner class, needs to be declared final.
- Unnecessarily line:
COUNT = 0;
- Transfer
COUNT
variable to one element array. - Variable
result
is unnecessary.
Not nice, but works:
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];
}
Boris S.
Updated on September 07, 2021Comments
-
Boris S. over 2 years
Using Espresso and Hamcrest,
How can I count items number available in a recyclerView?
Exemple: I would like check if 5 items are displaying in a specific RecyclerView (scrolling if necessary).