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1.
There are many kinds of Android phone, so the user interfaces maybe different on some
brand phones or different scales of the same brand.
2.
Application permission requirements, allow the necessary permissions when the APP is
installed (allow background running, using Bluetooth, operation on the folder, reading the
application list, etc.) and also set the permissions of the APP after installation: Allow background
running, never shut down when lock screen, allow self-starting (it is used to prevent the system
from forcibly exiting the APP when recording data), etc.
