Android ADB emulator-5554 unauthorized

In such a case, you can do all of the following in order to be assured that your emulator starts working again :

Go to cmd and type “adb kill-server”
Go to task manager and find “adb” in processes. If you find one, right click on it and click on end process tree.
In eclipse, go to Window>Android Virtual Device Manager, click on the AVD you want to launch, click on start and uncheck “Launch From Snapshot” and then click on launch.

That’s it! It will take a while and it should resolve your problem.

如果上面还解决不了问题，那么，请看下面

Simply “Wipe data” to fix this issue.
If it doesn’t work, go to emulated device and enable developer options > enable usb debugging

https://stackoverflow.com/questions/3152681/android-emulator-5554-offline

如果还不行，最后解决方案在这里，PS:不过要符合这个错误提示

C:\Users\***>adb shellerror: device unauthorized.This adb server's $ADB_VENDOR_KEYS is not setTry 'adb kill-server' if that seems wrong.Otherwise check for a confirmation dialog on your device.

Android adb设备未经授权

删除.android/adbkey|adbkey.pub这两个文件（为保险起见，可以将两文件暂时移动出.android目录。.android目录默认在C盘下的当前用户目录下，如果配置了 ANDROID_SDK_HOME环境变量，那就是在这个变量值的目录下）；
在AVD Manager中删除所有的avd，重新创建；
执行下命令adb devices，看看虚拟机的状态吧；

C:\Users\Administrator>adb devicesList of devices attachedemulator-5556   deviceemulator-5554   device

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