title: read an image I just wrote in android
body: <p>So, largely for debugging purposes, I want to be able to write an image at arbitrary points in my code, and look at it later. I figured this would be easiest if I just wrote a my bitmap to a file and read it back later, but I cannot seem to figure out where to find the file after I write it, or how to open an image that is not in res/drawable with a corresponding handle in R.</p>