如何让Espresso单击特定的RecyclerView项目? [英] How to let Espresso click a specific RecyclerView item?

问题描述

我正在尝试为使用RecyclerView的Android应用编写 Espresso 的检测测试.这是主要布局:

I am trying to write an instrumentation test with Espresso for my Android app which uses a RecyclerView. Here is the main layout:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/grid"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

</android.support.design.widget.CoordinatorLayout>

...以及项目视图的布局:

... and the item view layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/label"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</RelativeLayout>

这意味着屏幕上有几个TextViews，都具有label id.我正在尝试单击特定的标签.我试图让Espresso测试记录器生成代码:

This means there are a couple of TextViews on the screen which all have the label id. I am trying to click a specific label. I tried to let Espresso test recorder generate the code:

onView(allOf(withId(R.id.grid), isDisplayed()))
    .perform(actionOnItemAtPosition(5, click()));

我想做类似的事情:

// Not working
onView(allOf(withId(R.id.grid), isDisplayed()))
    .perform(actionOnItem(withText("Foobar"), click()));

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阅读

我阅读了很多有关该主题的内容，但仍然无法弄清楚如何根据其内容不是基于其位置索引来测试RecyclerView项目.

---

Readings

I read quite a bit about the topic but still cannot figure out how to test a RecyclerView item based on its content not based on its position index.

• 高级Android浓咖啡-在RecyclerViewActions上滑动(Chiu-Ki陈)
• RecyclerView和espresso，一个复杂的故事(帕特里克·培根，2015年7月18日)
• Espresso –在特定位置测试RecyclerViews (罗曼·皮尔(Romain Piel)，2016年4月15日)

• Advanced Android Espresso - Slide on RecyclerViewActions (Chiu-Ki Chan)
• RecyclerView and espresso, a complicated story (Patrick Bacon, Jul 18, 2015)
• Espresso – Testing RecyclerViews at Specific Positions (Romain Piel, April 15, 2016)

推荐答案

您可以实现自定义的RecyclerView匹配器.假设您有RecyclerView，其中每个元素都有要匹配的主题:

You can implement your custom RecyclerView matcher. Let's assume you have RecyclerView where each element has subject you want to match:

public static Matcher<RecyclerView.ViewHolder> withItemSubject(final String subject) {
    Checks.checkNotNull(subject);
    return new BoundedMatcher<RecyclerView.ViewHolder, MyCustomViewHolder>(
            MyCustomViewHolder.class) {

        @Override
        protected boolean matchesSafely(MyCustomViewHolder viewHolder) {
            TextView subjectTextView = (TextView)viewHolder.itemView.findViewById(R.id.subject_text_view_id);

            return ((subject.equals(subjectTextView.getText().toString())
                    && (subjectTextView.getVisibility() == View.VISIBLE)));
        }

        @Override
        public void describeTo(Description description) {
            description.appendText("item with subject: " + subject);
        }
    };
}

和用法:

onView(withId(R.id.my_recycler_view_id)
    .perform(RecyclerViewActions.actionOnHolderItem(withItemSubject("My subject"), click()));

基本上，您可以匹配任何您想要的东西.在此示例中，我们使用主题TextView，但它可以是RecyclerView项内的任何元素.

Basically you can match anything you want. In this example we used subject TextView but it can be any element inside the RecyclerView item.

要澄清的另一件事是检查可见性(subjectTextView.getVisibility() == View.VISIBLE).我们需要使用它，因为有时RecyclerView中的其他视图可以具有相同的主题，但对于View.GONE而言却是这样.这样，我们就避免了自定义匹配器的多次匹配，并且只定位了实际显示主题的项目.

One more thing to clarify is check for visibility (subjectTextView.getVisibility() == View.VISIBLE). We need to have it because sometimes other views inside RecyclerView can have the same subject but it would be with View.GONE. This way we avoid multiple matches of our custom matcher and target only item that actually displays our subject.

这篇关于如何让Espresso单击特定的RecyclerView项目?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！