执行flutter doctor遇到以下错误：[!] license status unknown.

执行flutter doctor遇到以下错误：

[!] Android toolchain - develop for Android devices (Android SDK 28.0.1) ✗ Android license status unknown.

follow these steps:

1. open SDK Manager
2. go to SDK tools
3. Delete the "Android SDK Tools" from SDK Manager
4. first deselect the "Hide Obsolete Packages" and then select "Android SDK Tools (Obsolete)", install it.
5. run flutter doctor --android-licenses and select y for the prompts.

run flutter doctor and everything will be fine!!!!