Assert proper number of items in list with espresso

Question

What is the best way to inspect and assert that a listview is the expected size with android espresso?

I wrote this matcher, but don\'t quite know how to integrate i

Answer 1

Figured this out.

class Matchers {
  public static Matcher withListSize (final int size) {
    return new TypeSafeMatcher () {
      @Override public boolean matchesSafely (final View view) {
        return ((ListView) view).getCount () == size;
      }

      @Override public void describeTo (final Description description) {
        description.appendText ("ListView should have " + size + " items");
      }
    };
  }
}

If expecting one item in the list, put this in the actual test script.

onView (withId (android.R.id.list)).check (ViewAssertions.matches (Matchers.withListSize (1)));