Default [Q] Is it possible to change autofocus to fixed focus

Hello All,

Many a times i get blurred pics with rear camera due to the camera autofocus not complete or focus shifts while pressing the shutter button.
1) Is it possible to start focusing only after i press the shutter button?
2) Is it possible to change focusing method from autofocus to fixed focus? I think there is this option in xperia mobiles.

Thanks in advance.