camera application

Hi all ♥ I need to make a small robot and cheap with high quality camera as well as android system but i can't just use the phone because of it's wight i have 4 old phones but most of their cameras are connected by this type of pins in the pic and it's so hard to weld wires to these pins to...

Why, when i set picture as dekstop background, with the resolution of 1920x1080 on the 1366x768 resolution monitor the desktop wallpaper witch i used, gets a bit pixelated, for example this one http:// When i look at it in the gallery it is good quality even when i view it full screen, when why...