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NotificationUtil.java

package com.afwsamples.testdpc.common;

import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.content.Context;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.annotation.StringRes;
import android.support.v4.os.BuildCompat;
import android.support.v7.app.NotificationCompat;

import com.afwsamples.testdpc.R;

public class NotificationUtil {
    private static final String TAG = "NotificationUtil";
    private static final String DEFAULT_CHANNEL_ID = "default_testdpc_channel";
    public static final int BUGREPORT_NOTIFICATION_ID = 1;
    public static final int PASSWORD_EXPIRATION_NOTIFICATION_ID = 2;
    public static final int USER_ADDED_NOTIFICATION_ID = 3;
    public static final int USER_REMOVED_NOTIFICATION_ID = 4;

public static void showNotification(
            Context context, @StringRes int titleId, String msg, int notificationId) {
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        Notification notification = getNotificationBuilder(context)
                .setSmallIcon(R.drawable.ic_launcher)
                .setContentTitle(context.getString(titleId))
                .setContentText(msg)
                .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
                .build();
        notificationManager.notify(notificationId, notification);
    }

public static NotificationCompat.Builder getNotificationBuilder(Context context) {
        if (BuildCompat.isAtLeastO()) {
            createDefaultNotificationChannel(context);
        }
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
        builder.setChannelId(DEFAULT_CHANNEL_ID);
        return builder;
    }

@RequiresApi(Build.VERSION_CODES.O)
    private static void createDefaultNotificationChannel(Context context) {
        NotificationManager notificationManager =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        String appName = context.getString(R.string.app_name);
        NotificationChannel channel = new NotificationChannel(DEFAULT_CHANNEL_ID,
                appName, NotificationManager.IMPORTANCE_DEFAULT);
        notificationManager.createNotificationChannel(channel);
    }

}