Answer by haffax for Android - espresso - clicking on a listview entry based on custom objects

The matcher given to onData() must match the desired value returned by Adapter.getItem(int) of the desired ListView.

So in your example, the matcher should be something like this:

public static Matcher<Object> withContent(final String content) {    return new BoundedMatcher<Object, MyObjectWithItemAndSize>(MyObjectWithItemAndSize.class) {        @Override        public boolean matchesSafely(MyObjectWithItemAndSize myObj) {            return myObj.content.equals(content);        }        @Override        public void describeTo(Description description) {            description.appendText("with content '"+ content +"'");        }    };}