wallpaper crop function
<p>If I try and use an image from my gallery to be my homescreen wallpaper, I have to first crop the image. The crop screen that appears has two buttons (as well as save + cancel) which allows to choose between only a full screen image or whether or not you would like to be able to scroll the wallpaper (i.e. the width is double the screen size).</p>

<p>I was wondering if it was possible to use this cropping function elsewhere. For example, I am making a live wallpaper and would like the user to be able to choose a custom background image. I would like to use this crop function to get the image the correct size and aspect ratio.</p>
