Android在子线程中更新UI的方法汇总(共七种)
1、常规写法：new Handler()的handleMessage()和handler.sendMessage(msg)
2、handler的另一种用法：
3、handler.post(runnable)
4、handler.postDelayed(runnable,milliseconds)
5、activity.runOnUiThread(runnable)
6、view.post(runnable)
7、view.postDelayed(runnable,milliseconds)
