How to edit/reset Alarm Manager?

Question

I\'ve set up a Preference Screen in which i have a list preference which allows user to select time interval to notify them.

They can choose whether to

Answer 1

Follow these steps:

1. Copy the following methods to your Setting.java file:

   private final int NOTIFICATION_TIMER = 11;
   
   public void setAlarm(Context mContext,int requestCode,long time) {
   
       Intent myIntent = new Intent(mContext, AlarmReceiver.class);
       PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, requestCode, myIntent,0);
   
       cancelAlarmIfExists(mContext,requestCode,myIntent);
   
       AlarmManager alarmManager = (AlarmManager)mContext.getSystemService(ALARM_SERVICE);
       alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, (System.currentTimeMillis()+time), time, pendingIntent);
   }
   
   public void cancelAlarmIfExists(Context mContext,int requestCode,Intent intent){
       try {
           PendingIntent pendingIntent = PendingIntent.getBroadcast(mContext, requestCode, intent,0);
           AlarmManager am=(AlarmManager)mContext.getSystemService(Context.ALARM_SERVICE);
           am.cancel(pendingIntent);
       } catch (Exception e) {
           e.printStackTrace();
       }
   }
   

2. Call them from the onPreferenceChange() method. Like so:

   listPreference.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
       @Override
       public boolean onPreferenceChange(Preference preference, Object newValue) {
   
           long time = 34352355253; // calculate millisecons from change value by user.
           setAlarm(Settings.this,NOTIFICATION_TIMER,time);
           return false;
       }
   });
   

Answer 2

FLAG_CANCEL_CURRENT has the same effect as above answer

PendingIntent pi = PendingIntent.getService(this, 0, notifIntent, PendingIntent.FLAG_CANCEL_CURRENT);