等待查看带有浓缩咖啡的寻呼机动画? [英] Wait for view pager animations with espresso?

问题描述

尝试用 ViewPager 做一些测试.

Trying to do some tests with a ViewPager.

我想在选项卡之间滑动，并且在滑动完成之前我不想继续.但是似乎没有办法关闭视图寻呼机的动画(开发者选项下的所有动画都被禁用).

I want to swipe between tabs, and I don't want to continue until the swipe is complete. But there doesn't appear to be a way to turn off the animation for the view pager (all animations under the developer options are disabled).

所以这总是导致测试失败，因为视图分页器还没有完成它的动画，所以视图还没有完全显示:

So this always results in a test failure, because the view pager hasn't completed it's animation, and so the view is not completely displayed yet:

// swipe left
onView(withId(R.id.viewpager)).check(matches(isDisplayed())).perform(swipeLeft());

// check to ensure that the next tab is completely visible.
onView(withId(R.id.next_tab)).check(matches(isCompletelyDisplayed()));

是否有一种优雅的甚至推荐的方法来做到这一点，或者我是否坚持在那里放置某种定时等待?

Is there an elegant or maybe even recommended way to do this, or am I stuck putting some kind of timed wait in there?

推荐答案

IdlingResource @Simas 建议的实现实际上非常简单:

The IdlingResource @Simas suggests is actually pretty simple to implement:

public class ViewPagerIdlingResource implements IdlingResource {

    private final String mName;

    private boolean mIdle = true; // Default to idle since we can't query the scroll state.

    private ResourceCallback mResourceCallback;

    public ViewPagerIdlingResource(ViewPager viewPager, String name) {
        viewPager.addOnPageChangeListener(new ViewPagerListener());
        mName = name;
    }

    @Override
    public String getName() {
        return mName;
    }

    @Override
    public boolean isIdleNow() {
        return mIdle;
    }

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

    private class ViewPagerListener extends ViewPager.SimpleOnPageChangeListener {

        @Override
        public void onPageScrollStateChanged(int state) {
            mIdle = (state == ViewPager.SCROLL_STATE_IDLE
                    // Treat dragging as idle, or Espresso will block itself when swiping.
                    || state == ViewPager.SCROLL_STATE_DRAGGING);
            if (mIdle && mResourceCallback != null) {
                mResourceCallback.onTransitionToIdle();
            }
        }
    }
}

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