随时随地退出应用（结束之前所有的Activity）

1.新建JAVA类

/**
 * 活动管理器类
 */
public class ActivityCollector {
    public static List<Activity> 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) {
            if (!activity.isFinishing()){
                activity.finish();
            }
        }
    }
}

2.BaseActivity中：

//onCreate中增加Activity到任务管理器
ActivityCollector.addActivity(this);
//销毁activity
@Override
protected void onDestroy() {
    super.onDestroy();
    ActivityCollector.removeActivity(this);
}

3.在Activity中继承BaseActivity并调用该方法：

//结束之前所有的Activity
ActivityCollector.finishall();