首先，我们封装一个Toast

public static boolean waitForToast(String toast, long timeout) {
    return waitForToast(toast, Function::identity, timeout);
}

public static boolean waitForToast(String toast, Runnable r, long timeout) {
    UiAutomation automation = InstrumentationRegistry.getInstrumentation().getUiAutomation();
    try {
        AccessibilityEvent event = automation.executeAndWaitForEvent(
                r,
                e -> isToastShow(e, toast),
                timeout);
        event.recycle();
        return true;
    } catch (TimeoutException e) {
        return false;
    }
}

private static boolean isToastShow(AccessibilityEvent event, String toast) {
    if (event.getEventType() == AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED) {
        Parcelable parcelable = event.getParcelableData();
        if (!(parcelable instanceof Notification)) { // without Notification is Toast
            String toastMessage = "" + event.getText().get(0);
            Log.d(TAG, toastMessage);
            return toastMessage.contains(toast);
        }
    }
    return false;
}

接下来，我们就可以直接调用了

@Test
public void testFileManager_0015_checkFavoritesFunction() throws UiObjectNotFoundException {
    // 查看根目录的收藏功能，验证收藏功能
    FileListPage listPage = mHomePage.openAllPage().openFileListPage();
    String newFolderName = "Android";
    listPage.addToFavorites(newFolderName);
    boolean isAddFavorites = AutomatorHelper.waitForToast("Added to Favorites", 6000);
    Assert.assertTrue("add folder to favorites fail", isAddFavorites);

我使用了POM的写法，FileListPage  这个页面的操作我就不贴出来了，主要看后面的判断如何获取toast.