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Android开发之旅：组件生命周期（二）

2010-05-06 23:59 by 吴秦, 10216 阅读, 2 评论, 收藏, 编辑引言应用程序组件有一个生命周期——一开始Android实例化他们响应意图，直到结束实例被销毁。在这期间，他们有时候处于激活状态，有时候处于非激活状态；对于活动，对用户有时候可见，有时候不可见。组件生命周期...

Android开发之旅：组件生命周期（三）

Android系统试图尽可能长地保持一个应用程序进程，但是当内存低时它最终还是需要移除旧的进程。为了决定保持哪个进程及杀死哪个进程，Android将每个进程放入一个基于运行于其中的组件的重要性等级和这些组件的状态。重要性最低的进程首先被杀死，然后是次低，以此类推。总共有5个层次等级。下列清单按重要性...

Android开发之旅：组件生命周期（一）

引言应用程序组件有一个生命周期——一开始Android实例化他们响应意图，直到结束实例被销毁。在这期间，他们有时候处于激活状态，有时候处于非激活状态；对于活动，对用户有时候可见，有时候不可见。组件生命周期将讨论活动、服务、广播接收者的生命周期——包括在生命周期中他们可能的状态、通知状态改变的方法、...

Android开发之旅：组件生命周期（二）

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