Android : Send notification at particular time in android

I need to send notification, daily to particular time for example 4.25PM, I am doing this using alarm manager and notification, I have written alarm manager on landing page of application , and for if it triggers alarm , i have written broadcast for it. Following is my alarm code in landingPage.java

 Calendar calendar = Calendar.getInstance();
    calendar.set(Calendar.HOUR_OF_DAY, 16);
            calendar.set(Calendar.MINUTE, 25);
            calendar.set(Calendar.SECOND, 0);
            Intent notificationmassage = new Intent(getApplicationContext(),Notificationmassage.class);

//This is alarm manager

PendingIntent pi = PendingIntent.getService(this, 0 , notificationmassage,PendingIntent.FLAG_UPDATE_CURRENT);
    AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
    am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(),
                                AlarmManager.INTERVAL_DAY, pi);

following is my brodcast reciver package com.techbulls.crosshair.service;

import com.techbulls.crosshair.R;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.Toast;

public class Notificationmassage  extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent arg1) {
        showNotification(context);
    }
    private void showNotification(Context context) {

        Log.i("notification", "visible");

        PendingIntent contentIntent = PendingIntent.getActivity(context, 0,
                new Intent(context, Notificationmassage.class), 0);


        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(context)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle("TrackBulls")
                .setContentText("Turn on Your GPS Location");
        mBuilder.setContentIntent(contentIntent);
        mBuilder.setDefaults(Notification.DEFAULT_SOUND);
        mBuilder.setAutoCancel(true);
        NotificationManager mNotificationManager =
            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(1, mBuilder.build());
    }  
}

what is wrong with this approach.????