周考3utile

package bw.com.ak.utils;

import android.app.Activity;

import java.util.ArrayList;
import java.util.List;

        public class ActivityUtil {
            private List<Activity> activityList = new ArrayList<>();
            private static ActivityUtil instance;

            // 单例模式中获取唯一的ExitApplication实例
            public static synchronized ActivityUtil getInstance() {
                if (null == instance) {
                    instance = new ActivityUtil();
                }
                return instance;
            }

            // 添加Activity到容器中
            public void addActivity(Activity activity) {
                if (activityList == null)
                    activityList = new ArrayList<>();
                activityList.add(activity);
            }

            // 移除Activity
            public void removeActivity(Activity activity) {
                if (activityList != null)
                    activityList.remove(activity);
            }

            // 遍历所有Activity并finish
            public void exitSystem() {
                for (Activity activity : activityList) {
                    if (activity != null)
                        activity.finish();
                }
                // 退出进程
                // android.os.Process.killProcess(Process);
                System.exit(0);
            }

        }