Aseprite is not available for Android but there are some alternatives with similar functionality. The best Android alternative is Pixelesque, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Aseprite and five of them are available for Android so hopefully you can find a suitable replacement. Other interesting Android alternatives to Aseprite are Dotpict (Free), Pixly (Free), PixelCraft (Free, Open Source) and PixelMaker (Paid).
Pixelsque's goal is to be as simple as possible, while still retaining many powerful features. It works like any standard pixel art editor, with a pen, eraser, and shapes. Pinch zoom and two finger drag can be used to move around the image from anywhere.