Android Visualizer
https://github.com/felixpalmer/android-visualizer
A View subclass that Takes the input from the Android MediaPlayer and displays visualizations, like in iTunes or WinAmp
The Visualizer is designed to be modular, so it is very easy to combine visualizations to create more complex effects.
It's easy to create your own custom visualizations or combine/edit existing ones. Below are a few examples:
A pair of frequency distributions.
This is an example which uses the FFT data rather than the raw audio waveform
Line visualization
Draws the audio waveform on screen, pulsing on prominent beats
Circle visualization
Draws the audio waveform in a circle, with the radius changing over time
Combined visualization
A combination of all the above