Android Question App Installs but does not upgrade

[Lee Ogley]

I’ve inherited an app. This app has been in circulation for a couple of years, and it needs a small update. This I’ve done successfully but I’ve run into a problem. If I uninstall the old version of the app from the phone and install the new one, it installs and works correctly. If I try to upgrade the old app with the new app the install fails with a rather unhelpful error ‘App not installed’.

Now I need to issue the new application to 90+ engineers, so ideally need to be able to let them do a simple upgrade, as opposed to talking them through an uninstall followed by an install.

I’m using version 6.31 of B4A. Any help would be appreciated.

 

[KMatle]

Did you change one of the following? Check it twice!

- Sign Key (must be the same!)
- Package Name (must be the same!)

I assume you don't update via Google Play (via link or so)

 

[Lee Ogley]

You are right we just email the apk file to our engineers.

Now sure what you mean by Sign Key/Package Name. I was emailed the project file. Just paid/downloaded B4A and loaded the project. Once I got the missing libraries added, not done anything else except modify the code and compile/debug

Thanks

Lee.

 

[Erel]

You must use the previous signing key if you want to upgrade the app. The first step is to find it.

You will also need to change the SignKeyAlias in the ini file.

 

[KMatle]

For EVERY app I use the same key. So Google Play (and of course Android) knows it's the same app (more correct: same source/developer). This prevents that someone just claims an app is from you. Android checks that key! If the key is different, the app will not be updated...

So get the key you used for the previous version (browse your files for it).

 

[An Schi]

You have to ask the guy who mailed you the project for the key.