为什么不能再线程的run方法中新建一个handler方法，而必须要将handler作为线程的成员变量，否则回报错
jenkin_du
2016-04-02 20:23
如果在线程的run方法中直接新建一个继承自Handler类的handler对象，程序会报错误，错误：
Can't create handler inside thread that has not called Looper.prepare()
而将handler作为线程的成员变量则不会报错，为什么
4回答
-
- qq_慕神1420022
- 2022-03-31 17:31:35
嗯，我的演示里面把页面另存为utf8格式的了，这一步您做了没呢？
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- yyww
- 2016-07-27 09:41:54
在子线程中new一个Handler的话也可以，但需要在子线程中先调用Looper.prepare()然后是new Handler,最后是Looper.loop()，UI线程中起始自动创建了Looper对象，子线程需要Looper.prepare()来创建；最好看下源码，马上明白。
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- 慕__女神
- 2016-04-28 15:11:59
不能在主线程对UI进行布局，所以要交给Handler
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- 黑灬白
- 2016-04-04 16:38:05
不是很理解你这样的做法，一般的做法是在线程里做耗时操作，然后发送消息给handler去更新UI界面
Android必学-异步加载
50639 学习 · 311 问题