This section does not cover other Android marketplaces, such as Amazon App Store, because each of them has different processes. However, the common idea is that you need to completely build the unsigned version of the .apk, sign it using an existing or new keystore file, and, finally, zipalign to prepare it for upload.
Read more about uploading the application for publishing at https://support.google.com/googleplay/android-developer/answer/113469?hl=en
