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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

user2277241
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1 Answers1

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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.

CommonsWare
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  • so the error message could have occured because I started a debug run on eclipse ? And what can I appart from that option ... because i don't have an old APK and didn't find the option to download my actual APK from the store. – user2277241 Sep 08 '13 at 13:20
  • @user2277241: If your device or emulator has the production APK installed, signed with your production signing key, then yes, trying to install a debug APK signed the debug keystore will give this error. – CommonsWare Sep 08 '13 at 13:21
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    @user2277241: "i don't have an old APK" -- **NEVER EVER EVER EVER EVER SHIP PRODUCTION SOFTWARE WITHOUT MAINTAINING A COPY OF WHAT YOU SHIPPED**. That is all. – CommonsWare Sep 08 '13 at 13:22
  • alright i think i'll never do that again :( so am i right? if the play store doesn't show any errors when i upload a new apk to production that means there will be no problems for my users ? because i tried to upload it (no i didn't press the final "OK" button) ... but until then there was no error message shown by the store – user2277241 Sep 08 '13 at 13:28
  • @user2277241: "if the play store doesn't show any errors when i upload a new apk to production that means there will be no problems for my users ?" -- I'm pretty sure the Play Store will yell at you if there is a mismatched pair of signing keys, so you should be OK. – CommonsWare Sep 08 '13 at 13:30
  • thanks so much @CommonsWare! i really hope i was lucky this time and i'll never ship software without saving a backup :/ – user2277241 Sep 08 '13 at 13:32