The Android Color Picker is a beautifully designed component based on Lars Werkman's color picker: https://github.com/LarsWerkman/HoloColorPicker.
Unlike the original it's shown in a dialog box, allows entering an (A)RGB value and includes a color picker Preference.
The source code can be found here:
More details can be found here: https://github.com/1gravity/Android-ColorPicker
