In Eclipse, when debugging an Android project, the following information appears:

The connection to adb is down, and a severe error has occured.

You must restart adb and Eclipse.

Please ensure that ADB is correctly located at

Open the process manager, there will be *adb.exe process, because I opened the cool dog to listen to music, so kadb.exe process appears, close it, and type adb Start-up server in the command window; With successFuly displayed, you find that you are ready to debug. After restarting Cool dog, the debugging failed, so kadb. Exe was deleted from the installation path of Kugou (cool dog can still listen to music), and the debugging will not be disturbed by cool dog in the future.  

Android in the Studio, in the debug Android project, if the pop-up
adb is not responding. You can wait more, or kill “adb. Exe” process manually and click ‘Restart’
indicates the adb (adb) response to failure, open a command window, Enter netstat -aon|findstr "5037" (adb needs to use this port), you can find the PID(right-most number) that takes up this window, open task manager, select the “process” TAB, click “view – select column” in the TAB bar, tick “PID(process identifier)”, and click ok. You’ll see that each process displays its PID. Find the corresponding process number and close the process. Just restart AS.