android退出应用

来源：互联网发布：Linux dlsym 编辑：程序博客网时间：2024/05/16 18:13

随便写写：

方法1：写一个栈，退出的时候释放掉所有activitys，等的资源，如下:

自定义一个Actiivty 栈，不过利用一个单例模式的Activity栈来管理所有Activity。并提供退出所有Activity的方法。代码如下：

   public class ScreenManager {
private static Stack<Activity> activityStack;
private static ScreenManager instance;
private ScreenManager(){
}
public static ScreenManager getScreenManager(){
  if(instance==null){
   instance=new ScreenManager();
  }
  return instance;
}
//退出栈顶Activity
public void popActivity(Activity activity){
  if(activity!=null){
   activity.finish();
   activityStack.remove(activity);
   activity=null;
  }
}

//获得当前栈顶Activity
public Activity currentActivity(){
Activity activity=activityStack.lastElement();
return activity;
}

//将当前Activity推入栈中
public void pushActivity(Activity activity){
  if(activityStack==null){
   activityStack=new Stack<Activity>();
  }
  activityStack.add(activity);
}
//退出栈中所有Activity
public void popAllActivityExceptOne(Class cls){
  while(true){
   Activity activity=currentActivity();
   if(activity==null){
    break;
   }
   if(activity.getClass().equals(cls) ){
    break;
   }
   popActivity(activity);
  }
}
}

//---------------------------------------------------------------------------------------------------------------------

或者这样：

将下面SysApplication这个类复制到工程里面，然后在每个Acitivity的oncreate方法里面通过SysApplication.getInstance().addActivity(this); 添加当前Acitivity到ancivitylist里面去，最后在想退出的时候调用SysApplication.getInstance().exit();可直接关闭所有的Acitivity并退出应用程序。

附代码：
importjava.util.LinkedList;
importjava.util.List;
importandroid.app.Activity;
importandroid.app.AlertDialog;
importandroid.app.Application;
importandroid.content.DialogInterface;
importandroid.content.Intent;

publicclass SysApplication extends Application{
   private List mList = newLinkedList();
   private static SysApplicationinstance;

   private SysApplication(){
   }
   public synchronized static SysApplicationgetInstance() {
       if (null == instance) {
           instance = new SysApplication();
       }
       return instance;
   }
   // addActivity
   public void addActivity(Activity activity){
       mList.add(activity);
   }

   public void exit() {
       try {
           for (Activity activity : mList){
               if (activity != null)
                   activity.finish();
           }
       } catch (Exception e) {
           e.printStackTrace();
       } finally {
           System.exit(0);
       }
   }
   public void onLowMemory() {
       super.onLowMemory();
       System.gc();
   }
}
在应用程序里面的activity的oncreate里面添加SysApplication.getInstance().addActivity(this)
如：

public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
SysApplication.getInstance().addActivity(this);
}

方法2：

伪退出，不真正删除内存资源等信息，方便用户下次快速使用：

private void showTips() {
 
        AlertDialog alertDialog =new AlertDialog.Builder(this).setTitle("提醒")
                .setMessage("是否退出程序")
                .setPositiveButton("确定",new DialogInterface.OnClickListener() {
 
                    publicvoid onClick(DialogInterface dialog,int which) {
                        Intent intent =new Intent(Intent.ACTION_MAIN); 
                        intent.addCategory(Intent.CATEGORY_HOME); 
                        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); 
                        startActivity(intent); 
                    android.os.Process.killProcess(android.os.Process.myPid());
                    }
 
                }).setNegativeButton("取消",
 
                newDialogInterface.OnClickListener() {
                    publicvoid onClick(DialogInterface dialog,int which) {
                        return;
                    }
                }).create();// 创建对话框
        alertDialog.show();// 显示对话框
    }

0 0