Hi Gabriel,
the most easy way to install the img on the pi is to use the Android Things Setup Utility. You read more about this utility here
https://developer.android.com/things/hardware/raspberrypi.html
The steps are:
– connect your Pi with an ethernet cable to you home network. You can take a look in your router to see which ip address your Pi has (you will need to know the ip address for later).
– flash the img on the sd card with the setup utility following “wifi option” path.
– follow the instructions on the screen.
When finished, your pi should be connected to your home network using the wlan adapter.
Regards!