set android alarm at specific time

问题:

i set the alarm at specific time but every time i open the application it will turn on this is the code i used :

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this,0010000,intent,0);

Calendar time = Calendar.getInstance();
time.set(Calendar.HOUR, 5);
time.set(Calendar.MINUTE, 59);
time.set(Calendar.SECOND, 0);

alarmManager.set(AlarmManager.RTC,time.getTimeInMillis(),pendingIntent);

回答1:

Alright, you need to set the alarm to ring the next time it is 5:59:00. You do this by getting the current time, if its before 5:59:00, set the alarm, if its after 5:59:00 then add a day and set the alarm. Do it like so:

import java.util.Calendar;
import java.util.Date;


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    setContentView(new Panel(this));

    Date dat  = new Date();//initializes to now
    Calendar cal_alarm = Calendar.getInstance();
    Calendar cal_now = Calendar.getInstance();
    cal_now.setTime(dat);
    cal_alarm.setTime(dat);
    cal_alarm.set(Calendar.HOUR_OF_DAY,5);//set the alarm time
    cal_alarm.set(Calendar.MINUTE, 59);
    cal_alarm.set(Calendar.SECOND,0);
    if(cal_alarm.before(cal_now)){//if its in the past increment
        cal_alarm.add(Calendar.DATE,1);
    }
    //SET YOUR AlarmManager here

}

I wanted to give you a buildable example, but i don't fully understand alarmmanager yet, so this is what you have. Built on eclipse 3.5.2 with ADK 15

回答2:

Instead of placing this code in onCreate function, place it inside any button event or any other event which will be called only on user interaction. I think, that'll do.

PendingIntent pendingIntent =  PendingIntent.getBroadcast(this,0010000,intent,0);
pendingIntent.cancel();

add this 'cancel' method to your code. this will cancel the previous alarm before setting the new one.