Question: I want some clarity on image size of BigPictureStyle bitmap in notification. 

I have gone through some tutorials but could not find the size specifications about this bitmap.

Some told to have 2:1 aspect ratio. 

I want some clarity like what is recommended size of bitmap/image in 

```
 NotificationCompat.BigPictureStyle s = new NotificationCompat.BigPictureStyle().bigPicture(bitmap_image);
        s.setSummaryText("Summary text appears on expanding the notification");
         notificationBuilder.setStyle(s);

```

please guide me through this.

Answer: 
You can find a Google I/O slideshow presentation [here](http://commondatastorage.googleapis.com/io2012/presentations/live%20to%20website/105.pdf) that mentions this (presentation by Chet Haase, Romain Guy & Dan Sandler).

Specifically on slide 52 it states about BigPictureStyle:

> 
> **Protips**
> 
> 
> Images should be ≤ 450dp wide, ~2:1 aspect
> Bitmaps outside these bounds will just be wasting
> RAM (and possibly exceeding Binder IPC limits)
> 
> 
> 

Note that this presentation is a couple years old, but there is no reason to deviate from its suggestions.

Related: <https://code.google.com/p/android/issues/detail?id=36744>
it should be an .png image with transparent background .\* 710\*90\* its an image size i am using and its working well . :)