红米4手机（其它小米应该一样）adb 调试（usb ,tcp）

首先，手机解锁后安装su。

小米 开发者模式的进入方法是设置...找到miui版本号后,连续点击多次（不同版本或手机可能不一样）

开启了usb调试后，插入PC端，依然无法adb 连接。

此时需要在拨号界面输入：*#*#717717#*#*

再次adb devices应该可以看到了，如果看不到，先adb kill-server。

至于tcp方式连接adb,一般手机，下载个超级终端，在其上输入： 1） stop adbd 2)setprop service.adb.tcp.port 5555 3)start adbd 就可以了。

但是小米不行~~~~~~

具体方法是：1）先usb方式adb连接  2）adb tcpip 5555  3)adb connect 192.168.1.100（此IP为手机IP，且需要PC可以访问）
此时pc端应该可以使用adb devices看到tcp方式的连接了

参考资料：https://stackoverflow.com/questions/19485467/adb-wireless-device-unauthorized

其中的：

Solution

1 Connect device(over USB) to computer.

2 Authorize adb device, so it can communicate(handshake over USB) with computer

3 Check that the device is connected

$adb devices

List of devices attached

SC8SDQWGKBT4JVS4        device
4 Change to tcpip mode

$adb tcpip 5555

restarting in TCP mode port: 5555
5 Connect device(over WIFI) to computer, make sure both are on the same network

$adb connect 192.168.1.100

connected to 192.168.1.100:5555
6 Authorize adb device, so it can communicate(handshake over WIFI) with computer

7 Check that the device is connected

$adb devices

List of devices attached

SC8SDQWGKBT4JVS4        device

192.168.1.100:5555      unauthorized
Although I authorized the device, adb is seeing things differently.

To get things working correctly, unplug device from USB because there is a connection over WIFI.
8 Kill the adb server

$adb kill-server
9 Connect again over WIFI

$adb connect 192.168.1.100

* daemon not running. starting it now on port 5037 *

* daemon started successfully *

connected to 192.168.1.100:5555
10 Finally, Check that the device is connect

$adb devices

List of devices attached

192.168.1.100:5555      device
Device is now authorized, you can start debugging over WIFI.