取消另一个pendingintent中的AlarmManager pendingIntent

Question

I want cancel AlarmManager which define a service,in this service might start a new AlarmManger or cancel alarm that defined before.And I know the params pendingintent in alarmManager.cancel(PendingIntent),must be the same.compare with filterEquals(Intent other) but It still not work.cancel failed. here is my code

public class GetRoundStroe {
    private Store[] stores;
    private Context mContext;

    public GetRoundStroe(Context mContext) {
        this.mContext = mContext;
    }

    public Store[] getStores() {
        if (ComCommand.haveInternet(mContext)) {
            start_am_normal();
        } else {
            start_am_silence();
        }
        return stores;
    }

    public Store[] start_am_silence() {


        long firstTime = SystemClock.elapsedRealtime();

        AlarmManager am = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);

        if (AlarmHolder.mAlarmNormal != null) {
            am.cancel(AlarmHolder.mAlarmNormal);

        }

        am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                firstTime, TestSwitch.getInstance().getSilence_time(), AlarmHolder.mAlarmSilence);


        return null;


    }

    public Store[] start_am_normal() {


        long firstTime = SystemClock.elapsedRealtime();

        AlarmManager am = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE);

        if (AlarmHolder.mAlarmSilence != null) {
            MyLog.e(GetRoundStroe.class,"AlarmHolder.mAlarmSilence"+AlarmHolder.mAlarmSilence+"");
            am.cancel(AlarmHolder.mAlarmSilence);
        }
        am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                firstTime, TestSwitch.getInstance().getNormal_time(), AlarmHolder.mAlarmNormal);

        return null;
    }

    private static final class AlarmHolder {
        static final PendingIntent mAlarmSilence = PendingIntent.getService(ApplicationContext.getInstance(),
                0,
                new Intent(ApplicationContext.getInstance(), GetRoundSilenceService.class),
                0);

        static final PendingIntent mAlarmNormal = PendingIntent.getService(ApplicationContext.getInstance(),
                0, new
                Intent(ApplicationContext.getInstance(), GetRoundNormalService.class),
                0);

    }
}

GetRoundSilenceService and GerRoundNormalService invoke start_am_normal() or start_am_silence; Anyone could help me? thanks

Answer 1

   myIntent = new Intent(SetActivity.this, AlarmActivity.class);
   pendingIntent = PendingIntent.getActivity(CellManageAddShowActivity.this,
       id, myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
   pendingIntent.cancel();
   alarmManager.cancel(pendingIntent);

These lines of code surely can help you remove/cancel the pending intent and alarm.

The main thing that you will need is:

1. Create pending intent with the same id and appropriate intent FLAG.
2. Cancel that pending intent.
3. Cancel the alarm using alarm manager.

Answer 2

@MKJParekh answer is correct, however I would like to add more information so that we all know what will work and what will not.

Lets say on activityA you create and set the AlarmManager to open activityC in 30 seconds, then on some other activity which can be any, we want to cancel that AlarmManager. Thus, we would do the following;

in activityA we create and set the AlarmManager;

//activityA
Intent myIntentA = new Intent(actvityA.this, activityB.class)
myIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PendingIntent myPendingIntent = PendingIntent.getActivity(activityA.this, 0, myIntentA, PendingIntent.FLAG_ONE_SHOT);

//Calendar with the time we want to fire the Alarm
Calendar calendar = Calendar.getInstance();   // Get Current Time
calendar.add(Calendar.SECOND,30);      //Fire Alarm in 30 seconds from Now.                  

((AlarmManager)getSystemService(ALARM_SERVICE)).setExact(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), myPendingIntent);

in Another Activity some time later we want to cancel such AlarmManager created in activityA which we have no access to. Lets call this current activity activityZ;

//activityZ
Intent myIntentZ = new Intent(activityZ.this, activityB.class);
PendingIntent pendingIntentZ = PendingIntent.getActivity(activityZ.this, 0, myIntentZ, PendingIntent.FLAG_ONE_SHOT);

((AlarmManager)getSystemService(ALARM_SERVICE)).cancel(pendingIntentZ);

Some important points,

The context we provide in activityA in new Intent(context) and getActivity(context) are the same, however they do not have to match the activity from where we are canceling the AlarmManager , in this case activityZ has another context.

The class we want to open with the AlarmManager has to be the same in both activities new Intent (context, activityB.class) , the requestCode which is an int must be the same, I used 0 for this example. Finally the flag has to be the same in both activities PendingIntent.FLAG_ONE_SHOT .

myIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); was used because PendingIntent.getActivity requires it if we are starting an activity outside of a context of an existing activity.