question

Hi all. I'm new to this forum, so please forgive if I'm out of tune with local policies. I've been teaching myself Java over the last few months and after a bit of cursing have now successfully downloaded several apps onto my KindleFire HD. But I've been looking at the quality of the apps in the Store and realise just how far I've got to go before reaching an acceptable commercial standard. In particular, today, I was looking at an app that allowed you to place a picture on the screen, size and orientate it with a "pinch" control, dump it into the wastebin with a "flick" control and, oh, much more besides. I don't think this can be achieved with anything in the standard android View class, so my question is "where do I go to find libraries to achieve these effects?" Best wishes, MartinJ