Basics

USB Connection

将待调试的手机通过 USB 数据线连接开发计算机
在手机上打开开发者选项 - USB 调试
在开发计算机上 adb 所在目录下运行 adb devices -l ，此时 adb client 启动，并检测是否有 adb server 在运行，若没有则会自动启动，并将 client 连接至 server。
上面的命令会显示包含当前连接的所有模拟器和硬件设备的列表。

Wireless Connection

Here we use connection with an Nreal smart glass device as an example. The smart glass uses Android kernel and has WiFi networking. In our setting, the smart glass and the machine running adb (that is, my laptop) are connected to the same local network.

adb devices command lists all connected devices. Output looks like this:

List of devices attached
8eda6f94        device

8eda6f94 is the device serial id. Now restart adb in tcpip mode for this device. Run:

adb -s 8eda6f94 tcpip 5555

Here -s stands for 'serial' and it's followed by the device id. 5555 is the port. This don't have to be 5555 actually; I guess all odd ports between 5555 and 5585 works. (ref: [2])
- -s and the id can be omitted if the connected device is unique.
Now find the IP address of the android device for setting up wireless connection. adb shell execute shell commands directly on the target android device.(ref: [4]) There are several shell commands that can be used to get device's ip address (ref: [5]), for example ip route. So run:

adb -s 8eda6f94 shell ip route

Here we use -s to name the device, and let shell to execute ip route on the device. Output looks like this:

192.168.1.0/24 dev wlan0  proto kernel  scope link  src [ip address]

The address we want will appear at the [ip address] position.
Finally, use this address to connect to the device wirelessly:

adb connect [ip address]:[port]

Remember to replace the [ip address] with the address we get, and [port] with the port number we choose above (5555).
Now run adb devices , a new device would appear in the list. Notice that its serial id is exactly the [ip address]:[port]. The USB cable can be unplugged now and the first device would just disappear.