October 30th, 2010, 04:36 AM
Join Date: Feb 2010
Device(s): Galaxy S4
Galaxy Note 10.1
Nexus 7 2013 LTE
Carrier: Not Provided
Thanked 729 Times in 616 Posts
a. *a.apk is the file extension used in Android apps.
b. 3 places: system/app (installation location AFAIR) data/ app (you can take the 8.apk file from here if you installed an app) and data/app_private (APKs of apps marked as private in the Market).
c. No idea, you do not need to know either.
No need to do it at all. If you buy something, whatever Android phone you use with your GMail account you bought the app through the app will be visible in the Donloads section of the Market.
When you buy your first app, it will install automatically and in the Downloads section it will show as Installed.
Uninstall the app and go to the Downloads section again and you will see the app there with the status Purchased and you can install it right away, the only condition being you are using the same GMail ID you used when you bought the app.
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