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

1.先把eclipse关闭.

2.在管理器转到你的android SDK 的platform-tools下, 如图:


3.键入adb kill-server ,如果adb关闭了会提示 server not running *

4.再输入 adb start-server  如果不成功会提示 daemon not running. starting it now on port  ***的