有时开发中有这样的需求,每天几点定时提醒等等,下面就来实现这个功能。
首先新建一个广播接收者
public class AlarmReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
Log.e("--------收到提醒");
//TODO 实现功能
//重新计时第二天七点的
Intent i = new Intent(context, RemindService.class);
context.startService(i);
}
}
然后创建一个服务
public class RemindService extends Service {
int count = 0;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
AlarmManager manager = (AlarmManager) getSystemService(ALARM_SERVICE);
Long secondsNextEarlyMorning = Utils.getSecondsNextEarlyMorning(8);
Intent i = new Intent(this, AlarmReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(this, count++, i, PendingIntent.FLAG_UPDATE_CURRENT);
manager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + secondsNextEarlyMorning, pi);
return super.onStartCommand(intent, flags, startId);
}
}
最后获取当前时间到第二天几点的时间差
public class Utils {
/**
* 获取时间差
*/
public static Long getSecondsNextEarlyMorning(int num) {
Calendar cal = Calendar.getInstance();
if (cal.get(Calendar.HOUR_OF_DAY) - num >= 0) {
//如果当前时间大于等于8点 就计算第二天的8点的
cal.add(Calendar.DAY_OF_YEAR, 1);
} else {
cal.add(Calendar.DAY_OF_YEAR, 0);
}
cal.set(Calendar.HOUR_OF_DAY, num);
cal.set(Calendar.SECOND, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.MILLISECOND, 0);
Long seconds = (cal.getTimeInMillis() - System.currentTimeMillis());
return seconds.longValue();
}
}
这样就可以实现每天几点定时任务了。