Massive RAM usage!

You're using 70MB storage. RAM is the memory that the phone uses to run your program, it is faster than storage and generally isn't big enough to keep an entire app in it all at once. Even though my phone has 80GB's of storage, it only has 1GB RAM.

70MB might not be a huge concern especially if it is used on devices with external storage. Image files take up space. Keep them smaller by using compressed formats like jpg and png. When the program moves them into RAM it will convert them to a Bitmap which is much bigger since it is uncompressed.

I'm struggling with RAM issues myself, As best as I can tell always use LoadBitmapSample and set the size. I'm also trying to load only what I need to use at the time.