Through adb, I'm trying to determine if there is a way to get a hierarchy dump for a user specified display. currently the following can be done through adb
uiautomator dump
which produces an xml dump of the default screen. I'm assuming screen 0. But I don't see any parameters for uiautomator for specifying the display id. For example, the screencap app allows the "-d" parameter to specify the screen other then the default 0.
screencap -d 1
So, how would I get a hierarchy dump for display id 1?
Considering that uiautomator dumps the UI of the active window (see source code), one possible workaround might be to programmatically start some app on the specific display in order to set the focus and dump the UI hierarchy:
adb shell am start com.google.android.calendar --display 0
adb shell uiautomator dump /sdcard/window_dump0.xml
adb pull /sdcard/window_dump0.xml
and repeating the same steps against the secondary display you will get the corresponding UI hierarchy:
adb shell am start com.google.android.calendar --display 1
adb shell uiautomator dump /sdcard/window_dump1.xml
adb pull /sdcard/window_dump1.xml