Setting up Android Studio
Download the last version of Android Studio: click here
Then install Android Studio.
Choose Standard:

Select this setting (āI do not have a previous version of Studio or I do not want to import my settingsā):

How to create an APK
- Login in BuzApps.net App Design.
- Click “Manage” on the appropriate app
- While in the Editor, click the “Publication” tab.
- Click “Download” next to the text “Android Version“
And unzip the downloaded file.
Then go back to the main menu of Android Studio:

Click on āImport Projectā. You will see a warning message, donāt worry about that it is the normal process, click on Ok.
Then choose the Android Source folder you have unzipped, and click on āimportā.
When your project is imported, from the left menu, click on your folder āandroid_sourceā and open the tree.
From the main menu click on Build >Generate Signed APK.
Then, click next and you get this screen:

Okay, so you have chosen āCreate newā. Now we suppose that you are someone very organized (if not already, take a look to the article about iOS publication and organize your folders the same way), and thus that you have already create a folder for your app publication on your computer. Before having downloaded the android sources file, you have created a folder on your computer named āMy Awesome Appā, for instance, with two subfolders: one for the graphic items, like screenshots of this app, and one for the certificates which will be named ācertificateā. Thus, on your computer we have a folder named āMy Awesome Appā with the subfolder ācertificateā and the other subfolder āgraphicsā.
Okay now letās go back to Android Studio. You have clicked on āCreate newā, and you get this screen:

Now click on the button to browse in your computer folder and go to the ācertificateā folder, in the main folder āMy Awesome Appā, and below in the āFile nameā field, enter ācertificateā, and click ok:

Enter a password for the Key Store, enter an alias name (the name of the app is OK), and a password the Key Alias, set the validity period to 99 years, and enter the name of the app owner. Then click Ok:

In the summary screen click next :

Then in the next screen, choose āreleaseā for āBuild Typeā and then click on Finish. Your APK is built.
NOTE:
From Android Studio 2.0 you can encounter the error āError:ācom.android.build.gradle.BasePluginā does not implement the Plugin interface.ā. To fix this problem, just go in the menu of Android Studio in File > settings > build execution deployment > build tools > gradle, and then check the option āUse default gradle wrapperā like in the image below:

To fill out the app sheet on Google Play
Store Listing
In the Store Listing page, fill out the two descriptions with the description that are in the App details page in the backend of your Commercial Edition. In the Graphic Asset section, the mandatory elements are a 512Ć512 icon, at least 2 screenshots whatever if it is for tablets or phones (you can use the ones you have generated for the iPhone version (use ones created for iPhone 5 or iPads), and a 1024x500px image that will illustrate the app.
Then, in the Categorization section, choose āApplicationā for Application Type. Then select the appropriate category for this app, and then sleect a content rating for this app.
APK
Click on āUpload your first APK to productionā and upload the APK that has been created.
Go in Pricing & Distribution
Select if itās a paid or free app. It can be a paid only if the developer account has enabled Google Merchant Services. Then select all the countries or just specific one(s). Then scroll down and check āContent guidelinesā and āUS export lawsā. And Save.
Publish
In the upper right corner click on āDraftā and select āPublishā.
Voila! Your app is published.