Develop Reference

Testing app update in amazon store, got Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]

when we try to update our compiled app over the old app(installed from amazon store) on Kindle, we get this error:
Failure [INSTALL_FAILED_UPDATE_INCOMPATIBLE]
We have verified versionCode that increased, the package name is the same. We think we signed with the same key.
Could please anyone help me? I am new to Android though.

I saw this same error message when attempting to test the upgrade process of our application on Kindle devices accessing the Amazon App Store. I was locally building and signing the app and deploying via $ adb. I ensured that the build configuration was the same (i.e. -release) and that the version number had been incremented properly, but I was still receiving the error upon installation until the application was completely uninstalled. Forcing our users to uninstall for the upgrade was not an acceptable delivery mechanism.
Strangely, the issue did not occur when testing the same process on Samsung devices accessing the Google Play store. The source of the issue for me turned out to be the fact that Amazon removes your developer signing from uploaded .apk files and re-signs your built application with a different key store. Once our update got accepted for publishing, we were able to confirm that the upgrade worked as expected without having to uninstall the app.

Installation failed with message INSTALL_FAILED_UPDATE_INCOMPATIBLE: Package signatures do not match the previously installed version

I want to run my application in phone but I get following message:
Installation failed with message:
INSTALL_FAILED_UPDATE_INCOMPATIBLE: Package signatures do not match
the previously installed version; ignoring!.
It is possible that this issue is resolved by uninstalling an existing version of the apk if it is present, and then re-installing.
WARNING: Uninstalling will remove the application data!
Do you want to uninstall the existing application?
In my phone I have installed previous version of app from google play. I know that uninstalling old version of app from my phone can fix the problem but I don't want to do this because then I might lose all app specific data.
What I tried:
generating signed version of app using the same keystore.jks like previously
changing versionCode and versionName in build.grandle file and then generating new version of app
And still I have the same problem. What should I do to update my app without losing data?

There are two possibilities I can think of
You use Google Play App Signing. If you use Google Play App Signing then the signature in apps coming from Google Play will always be different to the app coming from your IDE. The only way you can get the update to work is to update the app from Google Play. The best way to do this during development is to use an "Internal test track". Google launched these at Google I/O this year and they let you update your app in seconds from Google Play. So when you have an update, don't install from your IDE, upload to Google Play internal test track, republish, and then update from Google Play. It is really quick.
You don't use Google Play App Signing, but you are trying to install your debug build instead of your release/production build. Make sure you are building the production release APK, so it is signed with the same key as the one uploaded to Google Play.

If I'm understanding correctly you want to re install the "same" apk in your phone but with some changes in the code (updates) but Android Studio can't install the new apk.
I can only think in one thing, this is the explanation:
Please remember that android has different "Build Variants" there could be many but you will always have "debug" and "production" build variants, as I can read, you have installed the one in Play Store this means that you have a "production" build variant already installed in your phone, so you need a new "production" variant version of your app with the same build data (code and name version) and the updates in the code.
Build a signed apk with the same data as the previous version (code and name version) (Just like the one you used to upload to Play Store).
Find the signed apk.
Use adb to check your connected devices, expect a list
adb devices
Use adb to install this new apk.
adb -s <device_identifier> install <apk_name_include_apk>
Following those steps should let you install what you need.

Go in your React Native > Android >app
in the app folder,
you can see a build just delete this folder and Clear React Native project by npm cache clean cmd/Terminal Command.
Now try to run I hope it will Run for some of you.
It's working for me.

Android shows signature conflict error while installing app

I want to provide an updated version to my app,
It is downloaded from my site not from google play service.
When I download the updated version its not replacing the old version, instead it shows error"An existing package by the same name with conflicting signature".
Is there any solution to replace the app without manually un-installing the older version from the device.

Every android application file – apk has two main things:
package name – (unique id of app like com.example.application)
signature
More information about the second. Every apk file should be signed with developer keystore. If this is the debug version it could be debug-keystore.
In this keystore there are some information about developer and other information.
When you install application android system at first checks package name – whether or not this application have been installed already. And if so system checks signatures. The signature of installed app and app to be installed must be the same. Otherwise you will get error, you describe in your question.
So, the answer is: not, you can't install another application with the same package name if the signatures of installed and to be installed apps are different.
You must uninstall previous version and install new version, if you need new version.

If That is Developed By You or a Developer.
Once Check weather the Entire Code and Package Names are Same or not, in the Manifest file..
If Its Not that app is not from you or your known developer means.
You need to Uninstall Previous Version and Install New One,
That Error You are Getting Is that App is Not Signed, means When we are Using UnSigned App It cannot Replace at the part of Signed app. first of all make your app as Signed.
Check more at Here
How to Make a App as self-Signed at here

Yes, the error message already describes your issue. Your issue is that your app is not signed with the same signature as the previous version.
So to prevent this error message you must sign the app with the same signature as the previous version.
More details about application signing can be found in the Android Developers documents.

to protect the identity of the application each revision(update) requires the same signed key(SHA1) which was used for the earlier release.
Eclipse by default uses debug-key to sign in all the packages.
Use the same method by which you first installed your app and everything should just work.

Installing Debug version of app while Production version is installed

I have created an app through Eclipse and have uploaded it in the app store. I have the app installed in my phone.
Now I am working on an update. I am having trouble installing the app because it tells me the signature is different.
I know that this is due to using different keystores to sign each. But I dont want to uninstall the app 'cause I want to make sure that the app is able to go to the normal app update process.
Is there a way to go around this?

There are a few possible solutions to this for you:
Change the package name to some thing different like com.example.myapp.debug and remove that from the package name before publishing (this would have to be in the manifest)
Yes you could uninstall the app, do debug work, then uninstall the debug and reinstall from app store, push the update and wait for Google Play to register that version.
Do as Kai said, sign the new version and install it as an update, but then you won't get the updates as triggered by Google Play unless you uninstall and reinstall

Sign your new version, then you can install it as an update as opposed to uninstalling the Google Play version. This is probably the only way.

How to install newer test version of my installed android app without uninstalling it?

I have my application in Google Play, I've downloaded and installed it on my phone.
I'm also currently working on update of this application, and whenever I want to install my .apk file on my phone it shows me, that I can't do it, because the app is already here.
Where in Eclipse can I set some settings, which will allow me to install my updated app without installing original one?
EDIT
I want to have two versions on my device at the same time.

One simple solution is to change the package name, since that's how the OS identifies the .apk. Indeed, the package is unique to the Market: how does an android phone(or market) recognize an app

You can not install and run the app from eclipse because the app installed on the device (the one from play store) is signed with a different key.
When you export your app you sign the apk with a specific key and when u run it from eclipse you sign it with a different key - the debugkey.
If you HAVE to install another version on the device without uninstalling the old one from the device (the one you got from the play store) you should:
1.export your app and sign it with the same key you signed the app you uploaded to the play store.
2.upload the exported apk to the device.
3.install it.
EDIT:
If you want to versions on the same device you should change the app package name.