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 public class ActivityCollector {

    public static List<activity deep="9"> activities = new ArrayList<>();

    public  static void addActivity(Activity   activity)

    {

        activities.add(activity);

    }

    public static void removeActivity(Activity   activity)

    {

        activities.remove(activity);

    }

    public static void finishAll()

    {

        for(Activity   activity:activities)

        {

//              活动未结束的就要将其销毁

            if(!activity.isFinishing())

            {

                activity.finish();

            }

        }

        activities.clear();

    }

}</activity><br>