ProgressBars 和 Espresso

当我在运行一些浓缩咖啡测试时显示的布局中有一个进度条时 - 然后我遇到：

Caused by: android.support.test.espresso.AppNotIdleException: Looped for 1670 iterations over 60 SECONDS. The following Idle Conditions failed .

解决这个问题的好方法是什么？发现了一些黑客的东西，但正在寻找一个好的方法

If the ProgressBar测试开始时不可见，Drawable可以用自定义替换ViewAction:

// Replace the drawable with a static color
onView(isAssignableFrom(ProgressBar.class)).perform(replaceProgressBarDrawable());

// Click a button (that will make the ProgressBar visible)
onView(withText("Show ProgressBar").perform(click());

习俗ViewAction:

public static ViewAction replaceProgressBarDrawable() {
    return actionWithAssertions(new ViewAction() {
        @Override
        public Matcher<View> getConstraints() {
            return isAssignableFrom(ProgressBar.class);
        }

        @Override
        public String getDescription() {
            return "replace the ProgressBar drawable";
        }

        @Override
        public void perform(final UiController uiController, final View view) {
            // Replace the indeterminate drawable with a static red ColorDrawable
            ProgressBar progressBar = (ProgressBar) view;
            progressBar.setIndeterminateDrawable(new ColorDrawable(0xffff0000));
            uiController.loopMainThreadUntilIdle();
        }
    });
}