在 Android 开发中，经常需要传递 Callback 给第三方 SDK，但是并不确定第三方 SDK 回调函数时是否都在主线程中执行，于是需要通过其它方式在每次 Callback 调用时执行一次线程切换操作，非常的繁琐。本项目利用 Java 动态代理的特性封装了回调中的线程切换操作，避免一遍又一遍的编写模板代码。示例：
val callback = object: Callback{
override void onCall(){
// do something in main thread
}
}
sdk.call(callback.mainThreadProxy())MIT License
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