如何在 Espresso 测试中调用自定义视图上的方法？

Question

我有一个自定义视图，我需要在该视图上调用特定方法来打开活动。 在 Espresso 测试中执行此操作的正确方法是什么？ 我只需要膨胀这个视图还是需要编写一个自定义的ViewAction ？

Answer 1

你可以像这样创建一个自定义的 ViewAction

public class MyCustomViewAction implements ViewAction{

    @Override
    public Matcher<View> getConstraints(){
        return isAssignableFrom(YourCustomView.class);
    }


    @Override
    public String getDescription(){
        return "whatever";
    }

    @Override
    public void perform(UiController uiController, View view){
        YourCustomView yourCustomView = (YourCustomView) view;
        yourCustomView.yourCustomMethod();
        // tadaaa
    }

}

并像往常一样使用它，例如

onView(withId(whatever)).perform(new MyCustomViewAction());

Answer 2

为了在断言中使用自定义方法的结果，我想出了以下对 lellomans 答案的修改：

public class MyCustomViewAction implements ViewAction{
    MyReturnObject returnValue = null;

    @Override
    public Matcher<View> getConstraints(){
        return isAssignableFrom(YourCustomView.class);
    }


    @Override
    public String getDescription(){
        return "whatever";
    }

    @Override
    public void perform(UiController uiController, View view){
        YourCustomView yourCustomView = (YourCustomView) view;
        // store the returnValue   
        returnValue = yourCustomView.yourCustomMethod();
    }   
}

我没有创建新的 MyCustomViewAction()，而是创建了一个 myAction 对象以供以后重用。

MyCustomViewAction myAction = new MyCustomViewAction();
onView(withId(whatever)).perform(myAction);
MyReturnObject returnValueForSpecialAssertions = myAction.returnValue;
// assert something with returnValueForSpecialAssertions