MainActivity.java

package com.test.myapplication;

import android.annotation.SuppressLint;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RemoteViews;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        new MyNotification(this, R.layout.notification_layout);
    }
}

@SuppressLint("ParcelCreator")
class MyNotification extends Notification {

    private Context ctx;

    public Context getCtx() {
        return ctx;
    }

    private NotificationManager mNotificationManager;

    public MyNotification(Context ctx, int layout_id) {
        super();
        this.ctx = ctx;
        String ns = Context.NOTIFICATION_SERVICE;

        mNotificationManager = (NotificationManager) ctx.getSystemService(ns);
        CharSequence tickerText = "Shortcuts";
        long when = System.currentTimeMillis();

        Notification.Builder builder = new Notification.Builder(ctx);
        Notification notification = builder.getNotification();
        notification.when = when;
        notification.tickerText = tickerText;
        notification.icon = R.mipmap.ic_launcher;

        RemoteViews contentView = new RemoteViews(ctx.getPackageName(), layout_id);


        //set button listners
        setListeners(contentView);

        notification.contentView = contentView;
        notification.flags |= Notification.FLAG_ONGOING_EVENT;
        mNotificationManager.notify(1387, notification);

    }

    private void setListeners(RemoteViews contentView) {
        RemoteViews button = new RemoteViews(ctx.getPackageName(), R.layout.image_btn_layout_test);


        Intent actionIntent = new Intent("MyIntent");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(ctx, 0, actionIntent, 0);
        button.setOnClickPendingIntent(R.id.image, pendingIntent);

        contentView.addView(R.id.root, button);
    }
}