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.
So,
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.