Failed to install ***.apk on device ': Unable to open sync connection!解决方法
Failed to install ***.apk on device '019417a3': Unable to open sync connection!java.io.IOException: Unable to open sync connection!
Launch canceled!
或者
Uploading ****.apk onto device '1000b1eda2c2'
Failed to install ****.apk on device '1000b1eda2c2': adb rejected install command with: device offline com.android.ddmlib.AdbCommandRejectedException: device offline
Launch canceled!
解决方法：
第一种：重启电脑，之后把手机查到电脑上，启动eclipse 第二种：手机-设置-应用程序-开发-usb调试打开再关闭一次
第三种：安装豌豆夹或者360手机精灵在电脑上，用他们连接手机，安装驱动。
第四种：在cmd下Try "adb kill-server" and then "adb start-server"
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