Feature Request: Provide a way to disable all system popups

We are currently using android emulator to run periodic espresso tests. However, tests can occasionally fail if Android suddenly decides to open popup over our app, which makes all espresso matchers fail since our app is not the focused window anymore.

Example popups:

* System UI (or any preinstalled system app) has stopped / is not responding

* Viewing full screen - To exit swipe down


Maybe this could be an option in developer options or somehow triggered/enabled by espresso or UiAutmator.

The issue names Android emulator runs, Espresso tests, Developer options, and UiAutomator, but no repository file or test entry point. Start by tracing how emulator or test configuration controls system UI, then define a supported mechanism whose completion criterion is preventing system popups from taking focus during periodic tests.

Written by the indexing model from the issue text.