When I found Happy Scale I threw out all my other weight tracking apps. It does exactly what I needed which was to track my weight and display/print out reports. The + at the bottom of the screen makes it very easy to enter a new weight. My only complaint is that I have not been able to successfully transfer the data from my old phone using Dropbox. Otherwise this is a great program.
Dwheartland about Happy Scale: Simple Weight Loss Tracker with Daily Moving Average Trend Line, v4.5.1