[Feat]: Enable support for multiscreen

[ovidiubarbu]

Is your feature request related to a problem? Please describe.
I have an Android device with output on 2 displays. Right now, I can see the display 0 ( which seems to be the default), but could not find a way to see display 1 in Appium Inspector, or to access its UI elements. Infotainment systems have multiple displays and would be very helpful to be able to automate UI on more than 1 screen.

Describe the solution you'd like
Support added to be able to point to the display needed, and be able to see it in the Inspector and access it's elements programmatically. ( seems like ADB could be used to take screenshots/xml_dump on a different screen, and Android Studio also has support for it )

Describe alternatives you've considered
Could not find any alternative at the moment.

Additional context
I had a discussion about this here, if it would help while developing:
appium/appium#19639

Thank you for considering this.

[sww0825521xy]

https://developer.android.com/jetpack/androidx/releases/test-uiautomator
Important changes since 2.2.0

Multi-display support: Added support for finding and operating on objects across multiple displays, and UiDevice methods to manage secondary displays

[jayeliu]

https://developer.android.com/jetpack/androidx/releases/test-uiautomator Important changes since 2.2.0

Multi-display support: Added support for finding and operating on objects across multiple displays, and UiDevice methods to manage secondary displays

Any progress?

[jayeliu]

This is UIautomator used to test multi-screen code, hope to help appium.
https://android-review.googlesource.com/c/platform/frameworks/support/+/2611669/13/test/uiautomator/integration-tests/testapp/src/androidTest/java/androidx/test/uiautomator/testapp/MultiDisplayTest.java#144

 // Helper to get all the display IDs in the current testing environment. 
    private static Set<Integer> getDisplayIds() { 
        Context context = ApplicationProvider.getApplicationContext(); 
        DisplayManager displayManager = context.getSystemService(DisplayManager.class); 
        return Arrays.stream(displayManager.getDisplays()).map(Display::getDisplayId).collect( 
                Collectors.toSet()); 
    } 

Manage multiple display screens primarily through DisplayManager