public void setSendNotificationBtn () {
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Intent intent = new Intent(MainActivity.this, notificationActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                PendingIntent.FLAG_CANCEL_CURRENT);

        //NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        Notification notification = new NotificationCompat.Builder(MainActivity.this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setWhen(System.currentTimeMillis())
                //根据给定的资源Id解析成位图
                .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
                .setTicker("Look Look!!")
                .setContentTitle("My Notification")
                .setContentText("Hello Notification")
                .setContentIntent(pendingIntent)
                .build();

        //builder..setSmallIcon(R.mipmap.ic_launcher)
        //builder.setContentIntent(pendingIntent);
        //Notification notification1 = builder.build();

        manager.notify(1, notification);
    }