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

当我们使用ADT的时候往往会遇到adb.exe无法正常启动的问题，例如以下： Tag: Theconnection to adb is down, and a severe error has occured. You must restart adb and Eclipse. Please ensure that adb is correctly located at。 如图： 问题分析： 什么

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