Why is NotificationManager not accepting my notification

Question

I am unable to get NotificationManager's Notifiy accept my arguments. The method is supposed to take 3 arguments.

String        tag
int           id
Notification  notification

For constructing the notification, I am using the NotificationCompat class, but I've tried even Notification.Builder.

import android.app.Notification;
import android.support.v4.app.NotificationCompat;

Regarding my build configuration, it is as follows:

compileSdkVersion 23
buildToolsVersion "23.0.2"

minSdkVersion 14
targetSdkVersion 21

EDIT: Code transcript:

import android.app.Notification;
import android.support.v4.app.NotificationCompat;

private void showNotification(Context context, String category, String title, String text, int tag, boolean ongoing)
{
    NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);

    Intent intent = new Intent(DevicePolicyManager.ACTION_SET_NEW_PASSWORD);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, new Random().nextInt(), intent, PendingIntent.FLAG_UPDATE_CURRENT);

    NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
    builder.setContentTitle(title);
    builder.setContentText(text);
    builder.setContentIntent(pendingIntent);
    builder.setOngoing(ongoing);
    builder.setSmallIcon(R.drawable.ic_launcher);

    Notification notification = builder.build();
    notificationManager.showNotification(context, category, title, text, new Random().nextInt(), ongoing);
    notificationManager.notify(null, 0, notification);
}

Answer 1

Use the Compat version NotificationManagerCompat, initialize it notificationManager = NotificationManagerCompat.from(getApplicationContext());. And after that, notify the manager notificationManager.notify(null, 0, notification);

import android.support.v4.app.NotificationCompat;

...

private NotificationManagerCompat notificationManager;

...

// onCreate
notificationManager = NotificationManagerCompat.from(getApplicationContext());

...

// Somewhere in your code
Notification notification = new NotificationCompat.Builder(this)
    .setContentTitle("I'm a title")
    .setContentText("Some text")
    .setSmallIcon(R.drawable.ic_notification)
    .setContentIntent(pendingIntent)
    .build();

notificationManager.notify(null, 0, notification);

Answer 2

notify in Object

this part of the 'error' message hints that your notificationManager is an Object, and that you declared it like this

Object notificationManager =
            getSystemService(Context.NOTIFICATION_SERVICE);

What you should have is this

NotificationManager notificationManager = (NotificationManager)
            getSystemService(Context.NOTIFICATION_SERVICE);