Android 如果应用程序未关闭（在后台运行），是否会导致应用程序崩溃？

我有一个应用程序在emulator和mobile中运行良好，但如果我们通过单击手机的退出按钮（而不是从应用程序）来关闭应用程序。几个小时后，我们将重新打开应用程序，它将从应用程序的中间（而不是从第一个屏幕）打开。在使用该应用程序若干次后，它会被挂起，并显示消息“不幸的是，应用程序已停止”。这是移动问题还是应用程序问题。

实际上，该特定应用程序未正确关闭。这只是应用程序错误。

我建议阅读文档。 Android操作系统有自己的应用程序生命周期管理。 在调用其onDestroy之前，每个活动都保持“活动”。例如，操作系统可以让一个活动保持活动状态几个小时，然后在没有足够内存执行其他任务时将其杀死

在您的情况下，最有可能的情况是，当您再次打开应用程序时，相同的活动重新运行（在emulator中，该活动可能在之前被终止），并且您处于错误状态，因为可能某些对象已被释放或重新初始化

正确的做法是使用其他一些状态回调，例如onPause/Resume来分配/处置活动使用的资源

您的代码可能如下所示：

public class SomeActivity extends Activity
{
     public void onCreate()
     {
         super.onCreate();
         // Do some object initialization
         // You might assume that this code is called each time the activity runs.
         // THIS CODE WILL RUN ONLY ONCE UNTIL onDestroy is called.
         // The thing is that you don't know when onDestry is called even if you close the.
         // Use this method to initialize layouts, static objects, singletons, etc'.    
     }

     public void onDestroy()
     {
         super.onDestroy();
         // This code will be called when the activity is killed.
         // When will it be killed? you don't really know in most cases so the best thing to do 
         // is to assume you don't know when it be killed.
     }
}

public class SomeActivity extends Activity
{
     public void onCreate()
     {
         super.onCreate();
         // Initialize layouts
         // Initialize static stuff which you want to do only one time  
     }

     public void onDestroy()
     {
         // Release stuff you initialized in the onCreate
     }

     public void onResume()
     {
         // This method is called each time your activity is about to be shown to the user,        
         // either since you moved back from another another activity or since your app was re-
         // opened.
     }

     public void onPause()
     {
         // This method is called each time your activity is about to loss focus.
         // either since you moved to another activity or since the entire app goes to the 
         // background.
     }

}

您的代码应该如下所示：

public class SomeActivity extends Activity
{
     public void onCreate()
     {
         super.onCreate();
         // Do some object initialization
         // You might assume that this code is called each time the activity runs.
         // THIS CODE WILL RUN ONLY ONCE UNTIL onDestroy is called.
         // The thing is that you don't know when onDestry is called even if you close the.
         // Use this method to initialize layouts, static objects, singletons, etc'.    
     }

     public void onDestroy()
     {
         super.onDestroy();
         // This code will be called when the activity is killed.
         // When will it be killed? you don't really know in most cases so the best thing to do 
         // is to assume you don't know when it be killed.
     }
}

public class SomeActivity extends Activity
{
     public void onCreate()
     {
         super.onCreate();
         // Initialize layouts
         // Initialize static stuff which you want to do only one time  
     }

     public void onDestroy()
     {
         // Release stuff you initialized in the onCreate
     }

     public void onResume()
     {
         // This method is called each time your activity is about to be shown to the user,        
         // either since you moved back from another another activity or since your app was re-
         // opened.
     }

     public void onPause()
     {
         // This method is called each time your activity is about to loss focus.
         // either since you moved to another activity or since the entire app goes to the 
         // background.
     }

}

---

底线：始终假设相同的活动可以再次运行。

请在问题中添加代码，至少您应该发布错误日志的cat日志。.是的，但在emulator中工作正常，有时（很少）我在手机上收到这条消息。所以我看不到logcat。你能告诉我如何正确关闭应用程序吗？你必须从退出按钮或后退按钮关闭应用程序。然后，只有应用程序正确关闭。您可以在任务管理器中检查应用程序是否仍在运行。请给我一个关于“正确的做法是使用其他一些状态回调，例如onPause/Resume来分配/处置活动使用的资源”的示例。当然，请查看答案。只是做了一些改变。