Android--ActivityCollector

public class ActivityCollector {
public static List activities=new ArrayList();

//增加活動
public static void addActivity(Activity activity){
    activities.add(activity);
}

//清除活動
public static void removeActivity(Activity activity){
    activities.remove(activity);
}

//清除所有活動
public static void finishAll(){
    for(Activity activity:activities){
        if(!activity.isFinishing()){
            activity.finish();
        }
    }
}

}