在Intent中使用FLAG_ACTIVITY_CLEAR_TOP标志关闭应用程序，然后system.exit();

或者有类似的方法，但是没有system.exit()当你想退出时调用这个方法:

public void exit() {
    startActivity(new Intent(this, HomeActivity.class).
    setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | IntentCompat.FLAG_ACTIVITY_CLEAR_TASK).putExtra(EXIT_FLAG, true));
}

在你的HomeActivity.onCreate()中添加以下代码

protected void onCreate(Bundle savedInstanceState) {
    if (getIntent().getBooleanExtra(EXIT_FLAG, false)) {
        if ((getIntent().getFlags() & Intent.FLAG_ACTIVITY_LAUNCHED_FROM_HISTORY) == 0) {
            finish();
        }
    }
......................

这将在不破坏Android生命周期的情况下工作。

这很简单。只要遵循我要告诉你的这些指示:

比如你有多个活动，从一个活动到另一个活动。你可能会像这样使用intent:

Intent i1 = new Intent(this, AnotherActivity);
startActivity(i1) 

你只需要添加finish();例如，从头到尾在每个活动上启动intent活动后，

Intent i1=new Intent(this, AnotherActivity);
startActivity(i1) 
finish();

所以当你点击退出按钮时使用的是finish()或System.exit(0)必须完全关闭你的应用程序。

我花了更长的时间来阅读这个问答，而不是真正实现一个半正确的Android应用程序生命周期。

这是一个GPS应用程序，轮询积分，并每隔几秒钟通过线程将当前位置发送到web服务…在Ted的情况下，这可能是每5分钟轮询一次更新，然后onStop可以简单地启动Ted所关心的更新活动，如果发现了一个(异步Ted，不要像Windows程序员那样编码，否则您的程序将像Windows程序一样运行……呃，这也没那么难)。

我在onCreate中做了一些初始代码来设置活动生命周期，包括checkUpdate.start();:

...

@Override
public void onStart() {
    super.onStart();
    isRemote = true;
    checkUpdate.resume();

    locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2000, 0, luh);
}

@Override
public void onPause() {
    isRemote = false;
    checkUpdate.suspend();
    locationManager.removeUpdates(luh);
    super.onStop();
}

这段代码可能是完全错误的，但它是有效的。这是我的第一个Android应用程序。

Voilà, an application that doesn't consume CPU when it's in the background, yet is instantly ready to reopen because it is in RAM (although not holding RAM as is the Android lifecycle) ... an app is always ready, it's a phone, guys/gals. If an app was to use up all the RAM and couldn't be shut down by the OS then the thing might stop ringing =P That's why the OS needs to be able to close your app when it's in the background (if your application isn't a resource hog it won't be closed BTW), so let's just write better applications.

我会考虑阅读Addison-Wesley出版的“Android Wireless Application Development”。我刚刚完成它，它是非常彻底的。

看来你对Android平台有一些基本的误解。一开始我也对Android应用程序的生命周期感到有点沮丧，但在更深入地了解后，我开始真正享受这种方法。这本书将回答你所有的问题，甚至更多。这确实是我为Android新开发者找到的最好的资源。

Also, I think you need to let go of a line-for-line port of the existing app. In order to port your application to the Android platform, some of the application design is going to change. The application-lifecycle used is necessary as mobile devices have very limited resources relative to desktop systems and allows Android devices to run several applications in an orderly and resource-aware fashion. Do some more in depth study of the platform, and I think you will realize that what you are wanting to do is entirely feasible. Best of luck.

顺便说一下，我与艾迪生-卫斯理或与这本书有关的任何个人或组织都没有任何关系。重读了我的帖子后，我觉得我有点像个迷弟。我真的非常非常喜欢它，而且发现它非常有帮助。：）

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。

你可以使用Process.killProcess(Process.myPid());杀死你的应用程序，但它可能不安全?我使用这个方法后没有遇到任何问题或崩溃，使用这个方法后，我的应用程序在DDMS列表中的进程消失了。