How can start develop an android app that changes all the colors of the device to black and white (after asking for confirmation and provide a way to return to normal mode)
If you are familiar with the Ultra Power Saving mode of some Samsung devices, I want to know how to implement and standard android app to implement that behavior for other devices that don't have this option included.
What special permissions needs the app ? which concepts of android development are usefull to implement this ?
I have searched different android development forums without any luck
I am not interested in restricting execution of apps or wifi or data connection, basically I want to apply a "black and white filter to the whole screen" like this app - Color Screen Filter
