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Apps android development is free?

Hi. I'm wondering.... if I want to built and sell an android app in google play, do I need to purchase any software? I don't have much money at this moment, so I'd like to use free tools in order to built my app, but of course, I'd like to sell it, I want tu built commercial apps. Is it posible? Should I purchase a software before?

I know that I must to pay $25 to google
 
All the development tools are free. (Wouldn't surprise me if there are commercial tools as well, but they aren't necessary).

I do wonder if you also need a registered domain name to use for your java namespace, but I've never found an answer to that.
 
yeah they're free. and no, you don't need a registered domain, many people don't even use .com as the namespace. Obviously you shouldnt use someone elses domain either.
 
On which stage this can cause a problem? Clashing with existing app package while publishing to Google Play?

the full package name wont be accepted, but if you did something like com.androidforums.newapp, then it might get uploaded. But of course you will get tossed off the play store quickly, and just have a general bad reputation as a rip off. So I don;t see the point, and have neevr really heard of anyone else doing that.

do you mean google development kit is free but I must to pay if i want a better development tool?

Eclipse and android studio are free( and the best), and you don't need anything more than that, and they are both pretty well optimized for android.

even the popular game engines I can think of are free.
 
You don't need a domain, but you need to state the home page of your app, when you register a new app on Google Play, along with your own Privacy Policy URL.
 
do you mean google development kit is free but I must to pay if i want a better development tool?
What is "google development kit"? I believe you mean Android SDK?

the full package name wont be accepted, but if you did something like com.androidforums.newapp, then it might get uploaded.
I'm talking about not the name of the app itself, but 'package' specified in the '<manifest>'. I believe Google checks if the package is unique before allowing to upload the apk.
 
The package is checked even before you upload your APK, it is checked when you create your app.
 
Check out the free Anroid class that just ended on Coursera. It was useful in helping me get my first app out to the app atore.
 
Google puts out lots of information to help aspiring developers learn android. Search up "android developer", and you'll most likely find the official site posted by android that contains tutorials and guides to help you learn.
 
I started downloading the SDK from the developer.android.com site. You may not spend any money while developing. I think that most people spend more when the time comes to promote the application.
 
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