How can I connect to Android with ADB over TCP?

     When i attemped to debug an application on an Android device, i met some question connecting to the device via WiFi. It shows error "unable to connect to 192.168. ..." when i use the command "adb connect 192.168. ...". 

      This is a solution to resolve this question:

        open the terminal program and type:

su

setprop service.adb.tcp.port 5555

stop adbd

start adbd

    Then ,type:

         adb connect ......