espresso_waitId

public abstract class ViewActions {
    public static final int DELAY = 100;

    public static ViewAction waitId(final int viewId, final long millis) {

        return new ViewAction() {
            @Override
            public Matcher<View> getConstraints() {
                return isRoot();
            }

            @Override
            public String getDescription() {
                return "wait for a specific view with id <" + viewId + "> during " + millis + " millis.";
            }

            @Override
            public void perform(final UiController uiController, final View view) {
                uiController.loopMainThreadUntilIdle();
                final long startTime = System.currentTimeMillis();
                final long endTime = startTime + millis;
                final Matcher<View> viewMatcher = withId(viewId);

                do {
                    for (View child : TreeIterables.breadthFirstViewTraversal(view)) {
                        if (viewMatcher.matches(child) && child.getVisibility() == View.VISIBLE) {
                            return;
                        }
                    }

                    uiController.loopMainThreadForAtLeast(DELAY);
                }
                while (System.currentTimeMillis() < endTime);

                throw new PerformException.Builder()
                        .withActionDescription(this.getDescription())
                        .withViewDescription(HumanReadables.describe(view))
                        .withCause(new TimeoutException())
                        .build();
            }
        };
    }

}