https://stackoverflow.com/questions/32132434/set-adb-vendor-keys
也就是点击AVD管理器右边的下拉列表，点击清除数据，再重启虚拟机
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finally its helps for me. Open the AVD Manager from Android Studio. Choose the dropdown in the right most of your device row. Then do Wipe Data. Restart your Virtual Device. It Works. |
或者可以重新 启动一个新的虚拟机，不过这一招没试过，原因应该和清除数据同理