Espresso - how to get current activity to test Fragments?

Question

I have been playing around with Espresso tests for couple weeks now and I finally decided to start testing Fragments.

Immediately I ran into a problem, how do I get current activity?

My app uses data from login so I can't launch the activity with test rule. Simply put, is there something similar to getActivity() when doing espresso tests?

score 29 · Accepted Answer · edited Aug 25 '17 at 14:25

29

I usually get it like this, it looks (and probably is) hacky but, hey, it works

import static android.support.test.InstrumentationRegistry.getInstrumentation;

public class MyTest {

    private Activity getActivityInstance(){
        final Activity[] currentActivity = {null};

        getInstrumentation().runOnMainSync(new Runnable(){
            public void run(){
                Collection<Activity> resumedActivity = ActivityLifecycleMonitorRegistry.getInstance().getActivitiesInStage(Stage.RESUMED);
                Iterator<Activity> it = resumedActivity.iterator();
                currentActivity[0] = it.next();
            }
        });

        return currentActivity[0];
    }
}

edited Aug 25 '17 at 14:25

JulianHarty

3,178
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answered Aug 17 '16 at 07:00

lelloman

13,883
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but how use this solve? for example now i used like this : `val activity = mActivityTestRule.getActivity() val idlingResource = ElapsedTimeIdlingResource(activity)` – Morozov Jan 23 '17 at 20:29
I'm afraid I didn't understand your problem – lelloman Jan 23 '17 at 20:34
Sorry for my english) i mean how i can call yours method in another class? – Morozov Jan 23 '17 at 21:49
you just add this method to your class :) – lelloman Jan 23 '17 at 22:17
For example MyTest.getActivityInstance() doesn t work( – Morozov Jan 23 '17 at 22:19

Oliver Metz · Answer 2 · 2019-11-03T22:11:29.253

Here is lelloman's solution with a slight change in Kotlin:

import android.app.Activity
import androidx.test.platform.app.InstrumentationRegistry.getInstrumentation
import androidx.test.runner.lifecycle.ActivityLifecycleMonitorRegistry
import androidx.test.runner.lifecycle.Stage

object EspressoHelper {
    fun getCurrentActivity(): Activity? {
        var currentActivity: Activity? = null
        getInstrumentation().runOnMainSync { run { currentActivity = ActivityLifecycleMonitorRegistry.getInstance().getActivitiesInStage(Stage.RESUMED).elementAtOrNull(0) } }
        return currentActivity
    }
}

Espresso - how to get current activity to test Fragments?

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