报错：
Starting emulator for AVD 'android8.1.0'
emulator: ERROR: This AVD's configuration is missing a kernel file! Please ensure the file "kernel-qemu" is in the same location as your system image.
emulator: ERROR: ANDROID_SDK_ROOT is undefined
解决过程分析如下：
第一个错误：ERROR: This AVD's configuration is missing a kernel file! Please ensure the file "kernel-qemu" is in the same location as your system image.
这个错误的排查思路：
（1）双击打开 SDK Manager，查看是否安装
Intel X86 Atom System Image 和 Arm EABI v7a System Image
没有安装的话，勾选进行install~~
问题：Android 8.1.0(API 27)里面没有Arm EABI v7a System Image，网上百度了不知道为啥没有这个插件，还没找到原因，就重新安装了Android7.1.0的模拟器了
Android7.1.0模拟器需要安装的插件如下图：
2. 重新双击打开AVD Manager
点击 Start后报错如下：
ERROR: x86 emulation currently requires hardware acceleration!
Please ensure Intel HAXM is properly installed and usable.
CPU acceleration status: HAX kernel module is not installed!
百度上找到这个报错的解决办法：
https://www.cnblogs.com/springxie/p/4742100.html