问题一：
Could not automatically detect an ADB binary. Some emulator functionality will not work until a custom path to ADB is added.
解决：安卓模拟器左边栏点击1处，在3处找到adb，adb在/Library/Android/sdk/platform-tools/下。
问题二：
Android SDK file not found: adb.
解决：
1、安装 Android SDK Tools (Obsolete)
2、重新下载 sdk/platform-tools 参考：
2.1 cd /Users/Name/Library/Android/sdk 文件夹，删掉platform-tools文件夹；
2.2 Then start AS again and go to File->Invalidate caches/restart.【这步不知道是不是必须的】
2.3 打开sdk manager --> SDK Tools --> 选中 Android SDK platform-tools 点击OK开始下载。
问题三：
Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses
解决：
flutter doctor --android-licenses
