解决方法：
方法一、查毒杀毒，也许了病毒占用了adb server的端口号，导致adb server启动不了，adb.exe识别不了。也可能是装了豌豆荚的原因，可以尝试卸载豌豆荚。
方法二、方法一不行，尝试此方法：将sdk中的tools和platform-tools完整路径加入到系统环境变量中
方法三、方法二不行，尝试此方法：更新Android SDK Manager更新sdk版本
方法四、重新设置sdk路径（之前sdk是哪个路径，重新设置时也设置那个路径），可能打开eclipse时没有成功refresh各项配置信息，导致没有识别到该路径下的adb.exe程序
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