How do I get Activity within an espresso test?

Issue

Im trying to use firebase ScreenShotter which takes the form:

ScreenShotter.takeScreenshot("main_screen_2", this /* activity */);

I'm not exactly sure how I'm supposed to get the Activity from within an Espresso test. At the moment my test class looks something like:

@RunWith(AndroidJUnit4.class)
@LargeTest
public class OtherTests {
    @Rule
    // Replace 'MainActivity' with the value of android:name entry in
    // <activity> in AndroidManifest.xml
    public ActivityScenarioRule <MainActivity> mActivityRule = new ActivityScenarioRule<>(MainActivity.class);




    @Test
    public void getDeviceInfo() {

        try {
            Thread.sleep(7000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }


        TestHelper.tap("APP_HEADER");
        TestHelper.expect("TRUE_HOME_BUTTON",5000);
        ScreenShotter.takeScreenshot("main_screen_2", this /* activity */);
    }


}

Solution

You have to get the scenario and then run your code in the callback passed to onActivity

    @Test
    public void getDeviceInfo() {
        ...
        mActivityRule.getScenario()
             .onActivity(activity -> ScreenShotter.takeScreenshot("main_screen_2", activity));
         
    }

Answered By - yogurtearl