i have a motorola xt615 with android 2.3.7 ---i usualy use the loudspeaker when talking and my problem is that when i want to hang up ..the screen is black and locked so i have to press the unlock button to turn on the screen and then press hang up the call... which is too much for such a simple action

i dont want the screen to go black when talking

a simple fix would be to set the lock screen time so the screen stays on for more time but its not good because of the battery duration and because the time choices are 2 minutes 10 minutes and 30 minutes....and usually i talk more than 2 minutes and less than 10 minutes

the perfect fix would be to be able to turn off the lock screen only while talking...
is there a way to do this ?