Recently we were doing some work on an existing RAD Studio Android app for a customer. Their previous developer had let them down so they’d brought it to us to do the next version.
Everything went smoothly until we needed to do an AppStore build. As part of this, you need to specify a keystore file that will be used to sign the APK. Fortunately they had the keystore file and password that the previous Developer had used. Unfortunately, they had two keystore files, and didn’t know which one had been used for the prior version.
This matters a lot, because if we used a different one, the Google Play store would view this as a brand new app, and not an updated version of the old app. That means their current users would not be prompted to download an update, and they would instead have to somehow get them to all uninstall the old one and install the new one. (more…)