NotificationUtils

package <Package name>

import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.Build;

import androidx.core.app.NotificationCompat;
import androidx.core.content.ContextCompat;


/**
 * @author Abdel-Rahman El-Shikh
 */
public class NotificationUtils {
    private static final String CHANNEL_ID = "message_notification_channel";
    private static final int MESSAGE_NOTIFICATION_ID = 1138;
    private static final int MESSAGE_PENDING_INTENT_ID = 3471;


    public static void notifyUser(Context context, String title, String body) {
        NotificationManager notificationManager = (NotificationManager)
                context.getSystemService(Context.NOTIFICATION_SERVICE);
        /**
         * This if statement block is so important as it creates notification channel for android devices above android Oreo.
         * and we can't send notification to these devices without this channel and any other device (below android Oreo)
         * will ignore the channel parameter.(Abdel-Rahman)
         */
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel mChannel = new NotificationChannel(
                    CHANNEL_ID,
                    context.getString(R.string.main_notification_channel_name),
                    NotificationManager.IMPORTANCE_HIGH);

            assert notificationManager != null;
            notificationManager.createNotificationChannel(mChannel);
        }
        /**
         * Here we are building the notification and setting it's content
         *  PARAM -> (CHANNEL_ID) Will be ignored with devices below Android Oreo
         */

        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, CHANNEL_ID)
                .setColor(ContextCompat.getColor(context, R.color.colorPrimary))
                .setSmallIcon()
                .setContentTitle(title)
                .setContentText(body)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(body))
                .setDefaults(NotificationCompat.DEFAULT_LIGHTS)
                .setContentIntent(contentIntent(context))
                .setAutoCancel(true)
                .setPriority(NotificationCompat.PRIORITY_DEFAULT);

        assert notificationManager != null;
        notificationManager.notify(MESSAGE_NOTIFICATION_ID, notificationBuilder.build());
    }

    private static PendingIntent contentIntent(Context context) {
        Intent intent = new Intent(context, <YourActivity>.class);
        return PendingIntent.getActivity(context, MESSAGE_PENDING_INTENT_ID, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    }


}