如何以编程方式退出android应用程序

喜欢ヅ旅行 2022-11-29 12:06 185阅读 0赞

本文翻译自：[How to quit android application programmatically][]

*I Found some codes for quit an Android application programatically.* **我找到了一些以编程方式退出Android应用程序的代码。** *By calling any one of the following code in onDestroy() will it quit application entirely?* **通过在onDestroy（）中调用以下任何一个代码，它会完全退出应用程序吗？**

1.  `System.runFinalizersOnExit(true)`  
    *(OR)* **（要么）**
2.  `android.os.Process.killProcess(android.os.Process.myPid());`

*I dont want to run my application in background after clicking quit button.* **我不想在单击退出按钮后在后台运行我的应用程序。** *Pls suggest me can i use any one of these code to quit my app?* **请问我可以使用这些代码中的任何一个来退出我的应用程序吗？** *If so which code can i use?* **如果可以，我可以使用哪些代码？** *Is it good way to quit the app in Android?* **这是退出Android应用程序的好方法吗？**

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### \#1楼 ###

参考：[https://stackoom.com/question/qyM0/如何以编程方式退出android应用程序][https_stackoom.com_question_qyM0_android]

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### \#2楼 ###

*I think that application should be kill in some case.* **我认为在某些情况下应用程序应该是kill。** *For example, there is an app can be used only after login.* **例如，有一个应用程序只能在登录后使用。** *The login activity has two buttons, 'login' and 'cancel'.* **登录活动有两个按钮，“登录”和“取消”。** *When you click 'cancel' button, it definitely means 'Terminate the app'.* **当您单击“取消”按钮时，它肯定意味着“终止应用程序”。** *Nobody wants the app alive in the background.* **没有人希望应用程序在后台运行。** *So I agree that some cases need to shut down the app.* **所以我同意某些情况需要关闭应用程序。**

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### \#3楼 ###

***There is no application quitting in android** , SampleActivity.this.finish();* **Android中没有应用程序退出 ，SampleActivity.this.finish（）;** *will finish the current activity.* **将完成当前的活动。**

*When you switch from one activity to another keep finish the previous one* **当您从一个活动切换到另一个活动时，请完成前一个活动**

Intent homeintent = new Intent(SampleActivity.this,SecondActivity.class);
    startActivity(homeintent);
    SampleActivity.this.finish();

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### \#4楼 ###

*[Is quitting an application frowned upon?][Is quitting an application frowned upon]* **[退出申请不赞成？][Is quitting an application frowned upon]** *.* **。** *Go through this link.* **浏览此链接。** *It answers your question.* **它回答了你的问题。** *The system does the job of killing an application.* **系统完成了杀死应用程序的工作。**

*Suppose you have two activities A an B. You navigate from A to B. When you click back button your activity B is popped form the backstack and destroyed.* **假设您有两个活动A和B.您从A导航到B.当您单击后退按钮时，您的活动B将从后台堆叠中弹出并销毁。** *Previous activity in back stack activity A takes focus.* **后堆栈活动A中的先前活动需要关注。**

*You should leave it to the system to decide when to kill the application.* **您应该将其留给系统来决定何时终止该应用程序。**

*public void `finish()`* **public void `finish()`**

*Call this when your activity is done and should be closed.* **在您的活动完成后调用此选项并应关闭。**

*Suppose you have many activities.* **假设你有很多活动。** *you can use Action bar.* **你可以使用动作栏。** *On click of home icon naviagate to MainActivity of your application.* **点击主页图标naviagate到你的应用程序的MainActivity。** *In MainActivity click back button to quit from the application.* **在MainActivity中单击后退按钮以退出应用程序。**

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### \#5楼 ###

*This may be very late and also as per the guidelines you're not supposed to handle the life cycle process by yourself(as the os does that for you).* **这可能是非常晚的，并且根据指导原则，您不应该自己处理生命周期过程（因为操作系统会为您执行此操作）。** *A suggestion would be that you register a broadcast receiver in all your activities with " `finish()` " in their `onReceive()` & whenever you wish to quit you can simple pass an intent indicating that all activities must shut down..... Although make sure that you do "unregister" the receiver in your `onDestroy()` methods.* **建议您在所有活动中注册一个广播接收器，并在其`onReceive()`注册“ `finish()` ”。当您希望退出时，您可以简单地传递一个表明所有活动必须关闭的意图.....确保在`onDestroy()`方法中“取消注册”接收器。**

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### \#6楼 ###

*I'm not sure if this is frowned upon or not, but this is how I do it...* **我不确定这是不是不赞成，但这就是我这样做的方式......**

***Step 1 -** I usually have a class that contains methods and variables that I want to access globally.* **第1步 -我通常有一个包含我想要全局访问的方法和变量的类。** *In this example I'll call it the "App" class.* **在这个例子中，我将其称为“App”类。** *Create a static Activity variable inside the class for each activity that your app has.* **在应用程序具有的每个活动的类中创建一个静态Activity变量。** *Then create a static method called "close" that will run the `finish()` method on each of those Activity variables if they are NOT null .* **然后创建一个名为“close”的静态方法， *如果它们不为null* ，将对每个Activity变量运行`finish()`方法。** *If you have a main/parent activity, close it last:* **如果您有主/父活动，请将其关闭：**

public class App
    {
        
        // INSTANTIATED ACTIVITY VARIABLES
        
    
            public static Activity activity1;
            public static Activity activity2;
            public static Activity activity3;
    
        
        // CLOSE APP METHOD
        
    
            public static void close()
            {
                if (App.activity3 != null) {App.activity3.finish();}
                if (App.activity2 != null) {App.activity2.finish();}
                if (App.activity1 != null) {App.activity1.finish();}
            }
    }

***Step 2 -** in each of your activities, override the `onStart()` and `onDestroy()` methods.* **第2步 -在每个活动中，重写`onStart()`和`onDestroy()`方法。** *In `onStart()` , set the static variable in your App class equal to " `this` ".* **在`onStart()` ，将App类中的静态变量设置为“ `this` ”。** *In `onDestroy()` , set it equal to `null` .* **在`onDestroy()` ，将其设置为`null` 。** *For example, in the "Activity1" class:* **例如，在“Activity1”类中：**

@Override
    public void onStart()
    {
        // RUN SUPER | REGISTER ACTIVITY AS INSTANTIATED IN APP CLASS
    
            super.onStart();
            App.activity1 = this;
    }
    
    @Override
    public void onDestroy()
    {
        // RUN SUPER | REGISTER ACTIVITY AS NULL IN APP CLASS
    
            super.onDestroy();
            App.activity1 = null;
    }

***Step 3 -** When you want to close your app, simply call `App.close()` from anywhere.* **第3步 -当您想关闭应用程序时，只需从任何地方调用`App.close()` 。** *All instantiated activities will close!* **所有实例化的活动都将关闭！** *Since you are only closing activities and not killing the app itself (as in your examples), Android is free to take over from there and do any necessary cleanup.* **由于您只是关闭活动而不是杀死应用程序本身（如您的示例中所示），因此Android可以从那里接管并进行任何必要的清理。**

*Again, I don't know if this would be frowned upon for any reason.* **同样，我不知道这是否会因任何原因而不受欢迎。** *If so, I'd love to read comments on why it is and how it can be improved!* **如果是这样，我很乐意阅读有关它为什么以及如何改进的评论！**

[How to quit android application programmatically]: https://oldbug.net/q/qyM0/How-to-quit-android-application-programmatically
[https_stackoom.com_question_qyM0_android]: https://stackoom.com/question/qyM0/%E5%A6%82%E4%BD%95%E4%BB%A5%E7%BC%96%E7%A8%8B%E6%96%B9%E5%BC%8F%E9%80%80%E5%87%BAandroid%E5%BA%94%E7%94%A8%E7%A8%8B%E5%BA%8F
[Is quitting an application frowned upon]: https://stackoverflow.com/questions/2033914/quitting-an-application-is-that-frowned-upon/2034238#2034238