different application signatures BUT same keystore

Question

when I updated my android app i got the following error message:

• Re-installation failed due to different application signatures.
• You must perform a full uninstall of the application. WARNING: This will remove the application data!
• Please execute 'adb **' in a shell.
• Launch canceled!

I personally got no problems with that but my question now is ... if I export the apk with the same keystore I used for previous updates. Is the app update a simple download for my users ? Or will they have any problems with it ?

Btw: I didnt format my computer or changed anything about my eclipse folder or my folder where I save my keystore etc.

Thanks in advance!

Greets

Answer 1

Is the app update a simple download for my users ?

Only if it was signed by the same production signing key as you used originally, which would not appear to be the case here.

I didnt format my computer or changed anything about my eclipse folder or my folder where I save my keystore etc.

Despite that, you attempted to update an APK with one signed by a different signing key (e.g., debug vs. production). Use jarsigner -verify -verbose -certs ..., where ... is the path to your APK, to dump signing information, so you can compare your old APK to your new one.