Most color pickers out there (Such as the API demo, CWAC-Colormixer, and other freebies) just let you pick a color and offer few or no supporting features, such as
I could develop these myself, but thought I'd ask first if someone already knows of any existing color picking dialogs with advanced features?
This may not cover every feature mentioned, but definitely hits many I did not: Keith's UberColorPicker is chalk full of features and far more powerful than the API demo or any other open source color picker I've seen.
Demo: https://market.android.com/details?id=com.keithwiley.android.ubercolorpickerdemo
Source: http://keithwiley.com/Downloads/AndroidUberColorPickerDemo.zip
EDIT: Word of warning though, it does not use layouts and can be a bear to adapt.