Notification Alert icons are shown bigger in android

Question

My notification icons become large on the notification alert and shows up properly later. Wht is the notification icon size that needs be dispalyed?

check both the icons:

This is shown when I get a new message. The icon is bigger and not good.

This is shown after new message alert is shown. Looks good.

Why can't I get the same size image icon when an new message alert comes up? Is there a size difference?

Below is the code I am using to show notification:

Intent notificationIntent = new Intent(context, Sms.class);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent, Intent.FLAG_ACTIVITY_NEW_TASK));

NotificationManager nm = (NotificationManager)   
context.getSystemService(Context.NOTIFICATION_SERVICE);
Resources res = context.getResources();
Notification.Builder builder = new Notification.Builder(context);
builder.setContentIntent(contentIntent)
.setSmallIcon(R.drawable.newyellowsms)
.setLargeIcon(BitmapFactory.decodeResource(res, R.drawable.smsnotification))
.setTicker(res.getString(R.string.ticker))
.setWhen(System.currentTimeMillis())
.setAutoCancel(true)
.setContentTitle(address)
.setContentText(body);
Notification n = builder.build();
nm.notify(007, n);

The R.string.ticker has the "New Message" string.

Answer 1

Your small icon size will be 24 x 24 set and check Notification.

Answer 2

Notification icons must be 24x24 dp. please refer this doc http://developer.android.com/design/style/iconography.html

Answer 3

Thanks Jay and Sanket Kachela.

I thought 24 dp is 24 px.

ldpi @ 24.00dp = 18.00px

mdpi @ 24.00dp = 24.00px

hdpi @ 24.00dp = 36.00px

xhdpi @ 24.00dp = 48.00px

After changing according to the above PX size notification is showing up properly.

Thanks!