滑动直到元素在 Android Espresso 中可见

Question

I have a long vertical screen with data entry form. I need swipeUp (scroll down) this screen until one of form's field is displayed on screen. I try use swipeUp() and scrollTo() ViewActions on the elements located higher on the screen, but it didn't help me, that these elements hiding from screen after swiping.

Answer 1

The idiomatic approach today would be to use RepeatActionUntilViewState . For example, the following would swipe up on an element with ID largeElementId up to 10 times until a view with text "Target text" is visible to the user:

onView(withId(R.id.largeElementId)).perform(repeatedlyUntil(swipeUp(), 
        hasDescendant(withText("Target text")), 
        10));

Answer 2

It should be something like this:

boolean found = false;
int i = 0;
while (!found && i < MAX_SWIPES) {
    onView(withId(R.id.largeElementId)).perform(swipeUp());
    SystemClock.sleep(500);

    try {
        uiElementToSearch.check(matches(isCompletelyDisplayed()));
        found = true;
    } catch (Exception e) {
        // The search continues
    }
    i++;
}

if (!found) {
    Assert.fail("The element has not been found.");
}