Screenshot in Android phone without rooting

Question

I want to get screenshot at any instant, suppose if user press menu button so that current screenshot could be taken and saved in SD Card . I searched alot and came with these conslusions

• The apps present on Google Play need your phone to be rooted, the apps that claim they can work without being rooted have 1.0 star rating and worst reviews
• We need to access the frame buffer and there is no API that provides that
• Every phone provides its own way like Press Menu + Vol to get screenshot, invoke such call.(least usefull as there are new technologies coming everyday)

So should I suppose that this is not possible

Answer 1

So should I suppose that this is not possible

Correct. Apps cannot take screenshots of other apps, for obvious privacy and security reasons.