Have you created automated tests for the user interface?

Yes, I have created automated tests for the user interface on Android. Typically, tools such as Espresso or UI Automator are used for this.

Here's an example of a simple test using Espresso:

import androidx.test.espresso.Espresso;
import androidx.test.espresso.action.ViewActions;
import androidx.test.espresso.assertion.ViewAssertions;
import androidx.test.espresso.matcher.ViewMatchers;

// Check that clicking the button displays the text
Espresso.onView(ViewMatchers.withId(R.id.my_button))
        .perform(ViewActions.click());

Espresso.onView(ViewMatchers.withId(R.id.my_text_view))
        .check(ViewAssertions.matches(ViewMatchers.withText("Hello, world!")));

Such tests help automatically verify the correctness of the interface after code changes and speed up the regression testing process.