Espresso - 如何点击随机RecyclerView项目？

Question

还有，告诉你如何与咖啡的RecyclerView单击某个固定项目，像几个帖子：

How to click on an item inside a RecyclerView in Espresso

Using Espresso to click view inside RecyclerView item

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例子：

//Change the 0 with any other number, will be the position of the item clicked. 
onView(withId(R.id.a_main_recycler)) 
       .perform(RecyclerViewActions 
         .actionOnItemAtPosition(0, click())); 

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但是，如果您想单击RecyclerView中的随机项，该怎么办？

Answer 1

使用getActivity()方法ActivityTestRule。

您将能够使用findViewById()（如在任何其他上下文中）和处理 RecyclerView实例。

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例子：

@RunWith(AndroidJUnit4.class) 
public class RandomBehaviorTest { 

    //This rule provides functional testing of a single activity. 
    @Rule 
    public ActivityTestRule<MainActivity> mActivityRule = 
      new ActivityTestRule<>(MainActivity.class); 

    @Test 
    public void clickRandomItem() { 
     //Magic happening 
     int x = getRandomRecyclerPosition(R.id.a_main_recycler); 

     onView(withId(R.id.a_main_recycler)) 
       .perform(RecyclerViewActions 
         .actionOnItemAtPosition(x, click())); 
    } 

    private int getRandomRecyclerPosition(int recyclerId) { 
     Random ran = new Random(); 
     //Get the actual drawn RecyclerView 
     RecyclerView recyclerView = (RecyclerView) mActivityRule 
       .getActivity().findViewById(recyclerId); 

     //If the RecyclerView exists, get the item count from the adapter 
     int n = (recyclerView == null) 
       ? 1 
       : recyclerView.getAdapter().getItemCount(); 

     //Return a random number from 0 (inclusive) to adapter.itemCount() (exclusive) 
     return ran.nextInt(n); 
    } 

}