如何使用espresso滚动到RecycerView-Item的子级

Question

onView(withId(R.id.recycler_view)).perform(scrollTo<MyViewHolder>(hasDescendant(withId(R.id.target_button))))

Action will not be performed because the target view does not match one or more of the following constraints:
at least 90 percent of the view's area is displayed to the user.

onView(withId(R.id.recycler_view)).perform(actionOnItemAtPosition<MyViewHolder>(0, EspressoUtils.clickChildViewWithId(R.id.target_button)))

Answer 1

当单击比我的屏幕大一倍的RecycerView项内的视图时，以下解决方案适用于我。注意：我点击的视图实际上是在屏幕外的，但由于它在视图层次结构中，所以可以点击它。

创建自定义ViewAction：

private fun clickChildViewWithId(id: Int) = object : ViewAction {

    override fun getConstraints() = null

    override fun getDescription() = "click child view with id $id"

    override fun perform(uiController: UiController, view: View) {
        val v = view.findViewById<View>(id)
        v.performClick()
    }
}

用法：

onView(withId(R.id.recycler_view))
            .perform(actionOnItemAtPosition<MyViewHolder>(0, clickChildViewWithId(R.id.target_button)))