idling resource that waits for child count to be greater than 0

gistfile1.txt

    public QuestionOptionIdlingResource(ViewInteraction viewInteraction, long timeout) {
        this.timeout = timeout;
        startTime = System.currentTimeMillis();

        viewInteraction.check(new ViewAssertion() {
            @Override
            public void check(View view, NoMatchingViewException noViewFoundException) {
                questionView = (LinearLayout) view;
            }
        });
    }

    @Override public String getName() {
        return QuestionOptionIdlingResource.class.getSimpleName();
    }

    @Override
    public boolean isIdleNow() {

        long elapsed = System.currentTimeMillis() - startTime;
        boolean isTimedOut = elapsed >= timeout;

        boolean idle = hasChildren() || isTimedOut;
        if (idle) {
            resourceCallback.onTransitionToIdle();
        }

        return idle;
    }

    private boolean hasChildren() {
        return questionView != null && questionView.getChildCount() > 0;
    }

    @Override public void registerIdleTransitionCallback(ResourceCallback resourceCallback) {
        this.resourceCallback = resourceCallback;
    }