Hello Expense is a simple, reliable expense tracker for Android
Hello Expense is one mobile app that gets it right. It's an expense tracker that lets you use your Android-powered phone to quickly log the money you spend and then analyze it and see where it all went.
I recently had the chance to use it in a real-life situation - a road trip that took a few days and involved quite a few expenses. Logging each expense took seconds, and at the end of each day I could get a great overview of how much money I spent on each category so far.
Categories and tags are user-configurable; the app also sports its own number pad to make number entry easy, regardless of what keyboard you're using.