Full screen caller for Android

Question

Hi i am new to android. i want this functionality in my project

i want when some one is calling me than i want fullscreen photo of that caller to be appeared in my screen means fullscreen caller id.so how can i place full screen photo at top of the incoming screen.. any example..?

my be i should use broadcast receiver or something like that ??

Any sample code for this functionality ??

thanks jaimin.