How to set Application Cache size for Android app.

Hi ,

I am using ListView control to show list of images in Xamarin PCL project and using UriImageSource for binding image to make use of caching. I have found some of my images doesn't load in list view even it has only 5 images to show. I have tried clearing cache and noticed that every time cache is 24kb. Any suggestions?
How to increase the size of application cache?

Thanks,
Kanwar