How to call a method on a custom view in an Espresso test?

Issue

I have a custom view on which I need to call a specific method to open an activity. What is the right way to do this in an Espresso test? Do I just need to inflate this view or do I need to write a custom ViewAction?

Solution

you can create a custom ViewAction like this

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
    }

}

and use it as you normally would, like

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

Answered By - lelloman