How to get found view from onView result(ViewInteration

for example here is my code:

@Test
public void manga_list2() throws Exception {
    onView(withId(R.id.manga_list));
}

I try onView(withId(R.id.manga_list)) result is ViewInteration, I hope get finded View and I try onView(withId(R.id.manga_list)).viewFinder.getView() in android studio > watches tool, and i get error:

Executing a query on the view hierarchy outside of the main thread (on: Instr: android.support.test.runner.AndroidJUnitRunner)

how to get the view?

update

if it cannot, please recommend me other ui testing that can get view directly, the espresso is too black-box