RunTimeException in Android espresso when selecting spinner in dialog

Question

I have an activity where some dialog is openend. On this dialog there is a spinner. I want to select a specific value in this spinner, but I get following exception:

Answer 1

Try this:

onData(allOf(is(instanceOf(String.class)), is(value)))
    .inRoot(isPlatformPopup()).perform(click());

Answer 2

I had the same error when I tried to match an item inside a spinner inside a dialog-fragment. This helped:

onView(withText(value)).inRoot(isPlatformPopup()).perform(click());

Answer 3

I had the same error when I tried to match a text inside an alert dialog. This helped:

onView(withText(text)).inRoot(RootMatchers.isDialog()).perform(click());

Answer 4

I have same issue on Pixel 2 XL with Android Pie and I have to add

.inRoot(isPlatformPopup())

when for EditText appears credentials autofill spinner