Will I need glue when reassembling an iPhone 4S?

I have to change the display assembly in my iPhone 4s, because someone stepped on it and the glass is completely shattered (the screen and touch work perfectly though), so I read the tutorial to see if it the repair was too hard for me.

Apparently it isn't, but I noticed that during the disassembly of the phone, almost everything with adhesive gets separated from it's base (Vibrator, Battery, etc.), it seems as if the glue stays in it's place, but I don't know if it's dry and needs reapplying.

Will I need to use adhesive to place these parts back in?.

If so, What adhesive would you recommend?