Kevin_Jim:
I want to make something like in the above picture instead of something like this ( http://farm8.staticflickr.com/7149/6457350363_0a26d43780_m.jpg ). To emulate the rows and cols. Because there're just to many of them for the traditional I/O pattern.
That picture shows a 16x16 simple (not Charlieplexed) matrix. Is that what you want to implement?
I you use the Arduino Mega you can do 16x16 analog without any extra hardware: 16 analog input pins and way more than 16 digital output pins.
If you want to use an UNO or smaller you will need some extra hardware. For analog inputs I would use a couple of CD4051 8-way multiplexers. They can share three data pins for addressing and use two analog input pins for i/o. The row addressing can be done with four output pins and a 1-of-16 decoder like the CD4067.