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Android学习笔记(38):Handler消息传递处理机制

先说为什么需要Handler： Android的主线程又叫UI线程，用于处理与UI相关的时间。Android只允许在主线程中修改UI组件，当我们在其他线程中需要修改UI界面时，就需要发送消息到主线程，再由主线程来处理UI的修改事件。在UI线程中执行耗时操作或网络操作，否...

【Android开发】线程与消息处理-Handler消息传递机制之Looper

在前面已经介绍了在Android中如何创建、开启、休眠和中断线程。不过，此时并没有在新创建的子线程中对UI界面上的内容进行操作，如果应用前面介绍的方法对UI界面进行操作，将抛出异常。为此，Android中引入了Handler消息传递机制，来实现在新创建的线程中操作UI界面。下面将对Handler消...

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