Android ArchTaskExecutor快速线程切换

 Jetpack 下 androidx.arch.core.executor 包中有一个线程池实现类 ArchTaskExecutor，

内部实现了切换线程的功能。

使用如下:

    /**
     *Author:XingHai.Zhao
     *Purpose: ArchTaskExecutor实用举例
     */    
    Executor threadExecutor;
    //处在未知线程中,判断当前线程是否是主线程,依此来决定线程要切换到哪个线程          
    if (Thread.currentThread() == Looper.getMainLooper().getThread()){
        //这里的逻辑是:如果当前处于主线程,那么最后切换到主线程
         threadExecutor = ArchTaskExecutor.getMainThreadExecutor();
    }else {
         threadExecutor = ArchTaskExecutor.getIOThreadExecutor();
    }
    thread { 
        //最终决定业务在哪里执行或返回
        threadExecutor.execute(new Runnable() {
            @Override
            public void run() {
               //需要最终切换的业务
            }
        });
    }