A particular project can be configured such that a specific device
or emulator ]
is used automatically each time
it is run
from within Android Studio.
This avoids the necessity
to make a selection
from the device chooser each time the application is executed.
To review
and modify the Run/Debug configuration,
click on the button
to the left
of the run button
in the Android Studio toolbar
and select the Edit Configurations… option
from the resulting menu: