继续学习Android，我读了以下内容:
Question: Does the user have a choice to kill the application
unless we put a menu option in to kill it? If no such option exists,
how does the user terminate the application?
Answer: (Romain Guy): The user doesn't, the system handles this automatically. That's what the activity lifecycle (especially onPause/onStop/onDestroy) is for. No matter what you do, do not put a "quit" or "exit" application button. It is useless with Android's application model. This is also contrary to how core applications work.
呵呵，我在Android世界里每走一步都会遇到一些问题=(
显然，你不能在Android中退出应用程序(但Android系统可以随时完全销毁你的应用程序)。这是怎么回事?我开始认为这是不可能写一个应用程序的功能作为“正常的应用程序”-用户可以退出应用程序时，他/她决定这么做。这不应该依靠操作系统来完成。
我正在尝试创建的应用程序不是Android市场的应用程序。它不是一个被大众“广泛使用”的应用程序，它是一个将在非常狭窄的商业领域使用的商业应用程序。
我其实很期待为Android平台开发，因为它解决了Windows Mobile和。net中存在的许多问题。然而，上周对我来说有点令人失望……我希望我不必放弃Android，但它现在看起来不太好=(
有办法让我真的退出应用程序吗?
博客文章“何时在Android应用程序中包含退出按钮”(提示:永远不要)解释得比我好得多。我希望每个Android开发者都读过这本书。
摘录:
In my experience what [the users] really want is:
An unambiguous way to guarantee that an app will stop consuming resources (battery, CPU cycles, data transfer, etc.).
Many users perceive that an exit button implements this requirement
and ask for it to be added. Developers, looking to please their users,
obligingly add one. Shortly thereafter they both fail.
In most cases the exit button simply calls Activity.finish(). This is exactly equivalent to hitting the back button.
Exactly. Services keep running and polling keeps happening. Users may think they've killed the app but they haven't, and soon
they'll be even more annoyed.
Exit behavior is now ambiguous. Should your exit button just close the Activity, or should it also stop all associated Services, Receivers, and Alarms? What should Back do? What happens if they hit Home instead? What happens if your app has a widget? Should the exit button stop that from updating too?
The solution is to make the back button behave as you'd expect the
exit button to. Better yet, simply stop consuming resources whenever
the app isn't visible.
继续阅读完整的文章。
对于应用程序的第一个(启动)活动，
@Override
public void onBackPressed(){
// Exit
moveTaskToBack(true);
}
为我工作。我想在这里关闭应用程序。从其他活动中回来;我用了意图，例如:
@Override
public void onBackPressed(){
// Going back....
Intent intent = new Intent(ActivityB.this, ActivityA.class);
startActivity(intent);
finish();
}
注意:这段代码适用于开发人员想要从ActivityZ返回ActivityA然后关闭应用程序的场景。
