Results 6 issues of Eitan Liu

upgrade gradle to new flutter default version

I have developed a plugin called "[dart_mappable_plugin](https://github.com/eitanliu/dart_mappable_plugin)" , hope its increasing usability!

只要再项目根`build.gradle` 添加 `apply plugin: "therouter-starter"` 自动给Android模块添加 `kapt "cn.therouter:apt:$TheRouterVersion"` 和 `implementation "cn.therouter:router:$TheRouterVersion"`

Add features #383 Support kotlinx-coroutines `suspend` function. Support kotlinx-coroutines `Flow` return type.

When the ThumbDrawableSize is greater than the SeekBarHeight, the position of the thumb does not match the color position of the SeekBar.

更新下SDK和Gradle能跑了