1.handler详解super.onLooperPrepared(); // 初始化下载组件 } } privateHandlerThread mHandlerThread; private Handler downloadHandler = newHandler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); String url = (String) msg.obj; // 使用下载组件开始下载 } }; public void initHandlerhttps://www.jianshu.com/p/db5dfa471b36

2.Android的Handler使用规范androidhandler的机制和原理super.handleMessage(msg); Log.d(TAG,Thread.currentThread().getName() + " " + msg.what); } }; Log.d(TAG,Thread.currentThread().getName() + "loop 开始 会执行吗? "); // 手动开启循环 Looper.loop(); Log.d(TAG,Thread.currentThread().getName() + "loop 结束 会执行吗? "); https://blog.51cto.com/u_12204/7109698

3.Handler和Messagehandlerhandlemessage1.1一部分是创建Handler实例,重载handleMessage方法,来处理消息 1.mProgressHandler = new Handler() 2. { 3. public void handleMessage(Message msg) 4. { 5. super.handleMessage(msg); 6. } 7. }; 1.2当然,也可继承自Handler,同样要实现handleMessage(Message msg) https://blog.csdn.net/xxdw1992/article/details/78838859

4.鸿蒙随笔private Handler mHandler = new Handler(){ { @Override public void handleMessage(@NonNull Message msg) { super.handleMessage(msg); if(msg.what == 1){ } } }; 消息逻辑处理在handleMessage方法中进行。如果Handler的创建是在主线程中创建的,这样写是没有问题的,但是如果Handler的创建是在子线程https://developer.huawei.com/consumer/cn/blog/topic/03850750540700094