ActivityLifeCycleManager通用

public class ActivityLifeCycleManager extends Application{
    private List<Activity> activityList=null;
   
    
    private static ActivityLifeCycleManager instance;
    
    
    //private IPodManager mIPodManager=null;
    
    private ActivityLifeCycleManager(){
        activityList=new LinkedList<Activity>();
       
        //mIPodManager = (IPodManager)getSystemService("ipod");
    }
    
    public static ActivityLifeCycleManager getInstance(){
        if(null==instance){
            instance=new ActivityLifeCycleManager();
        }
        return instance;
    }
    
    public void addActivity(Activity activity){
        if(activityList!=null && activityList.size()>0){
            if(!activityList.contains(activity)){
                activityList.add(activity);
            }
        }else{
            activityList.add(activity);
        }
    }
    
    public void exit(){
      
        //mIPodManager.stop();
        if(activityList!=null && activityList.size()>0){
            for(Activity activity:activityList){
                activity.finish();
            }
        }
        System.exit(0);
    }
    

}