android之postDelayed是否运行在主线程中解答

知识点
1、postDelayde是否运行在主线程中？答案是肯定的。

代码如下

在绝对的UI线程中打印线程ID：

System.out.println("-=-=-=>>xianchengid00000 = " + Thread.currentThread().getId());

new Handler().postDelayed(new Runnable() {
@Override
public void run() {
System.out.println("-=-=-=>>xianchengid11111 = " + Thread.currentThread().getId());
ImageUtil.deleteImageFromSDCard(imgPath);
}
}, 3000);

07-09 10:47:24.110 17026-17026/com.spd.sinoss I/System.out: -=-=-=>>xianchengid00000 = 107-09 10:47:27.111 17026-17026/com.spd.sinoss I/System.out: -=-=-=>>xianchengid11111 = 1

方法的官方解释是：

The runnable will be run on the thread to which this handler is attached.

自然地依附在主线程中了。