I essentially have a custom IdlingResource
that takes a View
a constructor argument. I can't find anywhere that really talks about how to implement it.
I'm trying to use this answer: https://stackoverflow.com/a/32763454/1193321
As you can see, it takes a ViewPager
, but when I'm registering the IdlingResource
in my test class, I'm not sure how I can get my view.
I've tried findViewById()
and I've tried getting the currently running activity and then calling findViewById()
on that, with no luck.
Anyone know what to do in this scenario?
Figured it out. To get the view to pass into an idling resource, all you have to do is take the member variable of your ActivityTestRule
For example:
@Rule
public ActivityTestRule<MainActivity> activityTestRule = new ActivityTestRule<>(
MainActivity.class);
and then just call getActivity().findViewById(R.id.viewId)
So the end result is:
activityTestRule.getActivity().findViewById(R.id.viewId);
The accepted answer works as long as a test is running in the same activity. However, if the test navigates to another activity activityTestRule.getActivity()
will return the wrong activity (the first one). To address this, one can create a helper method returning an actual activity:
public Activity getCurrentActivity() {
final Activity[] currentActivity = new Activity[1];
InstrumentationRegistry.getInstrumentation().runOnMainSync(new Runnable() {
@Override
public void run() {
Collection<Activity> allActivities = ActivityLifecycleMonitorRegistry.getInstance()
.getActivitiesInStage(Stage.RESUMED);
if (!allActivities.isEmpty()) {
currentActivity[0] = allActivities.iterator().next();
}
}
});
return currentActivity[0];
}
And then it could be used as the following:
Activity currentActivity = getCurrentActivity();
if (currentActivity != null) {
currentActivity.findViewById(R.id.viewId);
}
I haven't already used IdilingResources
in Espresso
, but did you saw these articles:
- Espresso: Custom Idling Resource by Chiuki
- Wait for it...a deep dive into Espresso's Idling Resources
Also please check official Android Docs: Idling Resources (reference)
To answer your question,
the best way to do it is passing in an instance of one of the Views into the class's constructor. Check: Calling findViewById() from outside an activity
another way is getting view by context. Check android - How to get view from context?
Here's an exmple taken from a link above:
Starting with a context, the root view of the
associated activity can be had by
View rootView = ((Activity)_context).Window.DecorView.FindViewById(Android.Resource.Id.Content);
In Raw Android it'd look something like:
View rootView = ((Activity)mContext).getWindow().getDecorView().findViewById(android.R.id.content)
Then simply call the findViewById on this
View v = rootView.findViewById(R.id.your_view_id);
This might be also useful: How to call getResources() from a class which has no context?
Hope it help