Android schedule Notification – Fire Notification Every Day at the Specific time

1. Create a Method on your Activity and Call it on Oncreate

private void fireNotification(){

        AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        Intent alarmIntent = new Intent(this, MyReceiver.class);

        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, alarmIntent,PendingIntent.FLAG_UPDATE_CURRENT);
        alarmIntent.setData((Uri.parse("custom://"+System.currentTimeMillis())));
        alarmManager.cancel(pendingIntent);

        Calendar alarmStartTime = Calendar.getInstance();
        Calendar now = Calendar.getInstance();
        alarmStartTime.set(Calendar.HOUR_OF_DAY, 7);
        alarmStartTime.set(Calendar.MINUTE, 30);
        alarmStartTime.set(Calendar.SECOND, 0);
        if (now.after(alarmStartTime)) {
            Log.d("Hey","Added a day");
            alarmStartTime.add(Calendar.DATE, 1);
        }

        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, alarmStartTime.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);
        Log.d("Alarm","Alarms set for everyday 7.30 am.");


    }

2. Create a BroadcastReceiver class

package com.arifhasnat.booksapp.services;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;


public class MyReceiver extends BroadcastReceiver {

    public MyReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Intent intent1 = new Intent(context, MyNewIntentService.class);
        context.startService(intent1);
    }
}

3. Create a IntentService class

package com.arifhasnat.booksapp.services;

import android.app.IntentService;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.media.AudioAttributes;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;

import androidx.core.app.NotificationCompat;

import com.arifhasnat.booksapp.activities.HomeActivity;

import devsbrain.tafsiribnkathir.R;

public class MyNewIntentService extends IntentService {
    private static final int NOTIFICATION_ID = 3;

    public MyNewIntentService() {
        super("MyNewIntentService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        String message = getString(R.string.notification_message);
        String title = getString(R.string.notification_head);

        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel("channel_1",
                    "Channel_1",
                    NotificationManager.IMPORTANCE_DEFAULT);
            channel.setDescription(message);
            mNotificationManager.createNotificationChannel(channel);

        }
        NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext(), "channel_1")
                //.setSound(customSoundUri)
                .setSmallIcon(R.drawable.ic_icon) // notification icon
                .setContentTitle(title) // title for notification
                //.setContentText(message)// message for notification
                .setStyle(new NotificationCompat.BigTextStyle()
                        .bigText(message))
                .setAutoCancel(true); // clear notification after click

        intent = new Intent(getApplicationContext(), HomeActivity.class);
        PendingIntent pi = PendingIntent.getActivity(getApplicationContext(), 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        mBuilder.setContentIntent(pi);

        //Notification sound
        try {
            //Uri notification = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" + getPackageName() + "/" + R.raw.islamic);
            Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
            r.play();
        } catch (Exception e) {
            e.printStackTrace();
        }

        mNotificationManager.notify(0, mBuilder.build());


    }


}

4. Finally Add receiver and service on Menifest

<receiver android:name="com.arifhasnat.booksapp.services.MyReceiver"  android:enabled="true"
            android:exported="false"></receiver>
        <service
            android:name="com.arifhasnat.booksapp.services.MyNewIntentService"
            android:exported="false" >
        </service>