ANDROID----如何随时随地退出活动

首先创建一个类:
public class CollectorActivity{
public static List activities=new ArrayList<> ();
public static void addActivity(Activity activity){
activities.add(activity);
}
public static void removeActivity(Activity activity){
activities.remove(activity);
}
public static void clearAll(){
for(Activity activity:activities){
if(!activity.isFinishing()){
activity.finish();
}
}
activites.clear();
}
}