基于android的提醒功能，利用了AlarmManager实现定时提醒，同时，利用BroadcastReceiver组件解决了重启之后AlarmManager失效的功能，这中间还借用了SharedPreferences作为数据存储的地方。-Android based reminders, use AlarmManager achieve timing reminder, same time, using BroadcastReceiver component solved after rest