I would suppose you received down votes as this is not really a question for stackoverflow. As commonsware stated, it is best practice to reach out to the developers and see if they are willing to divulge any info on what they used to develop their apps. As well there are multiple resources out there for starting game development in android. One that comes to my mind is XDA, but even just using google to dig around.
Here is a link to a game development thread on XDA
http://forum.xda-developers.com/showthread.php?t=1753131
And here is a link to the development thead mentioned in XDA
http://www.kilobolt.com
Stackoverflow is more designed and targeted to specific code problems/questions. It is not meant for individuals to ask for “how do i make this” questions.
For reference, please see the link below on what should be asked here on Stackoverflow
https://stackoverflow.com/help/on-topic
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solved What technology uses this tree games app? [closed]