Publishing an Ionic-3 app to Android Store

[khatauli]

Hi there, I created a release version of my APK, and then followed
https://ionicframework.com/docs/v1/guide/publishing.html to try to publish an app, but I am getting the following error:
You uploaded an APK with an invalid signature (learn more about signing). Error from apksigner: ERROR (Jar signer xxx.RSA): JAR signature META-INF/xxx.RSA uses digest algorithm SHA-256 and signature algorithm RSA which is not supported on API Level(s) 16-17 for which this APK is being verified.

Any help will be appreciated!

[cherry]

It seems you try to sign the Package with an invalid algorithm, instead of using SHA1withRSA use this SHA1with*.

Since you are using a very old version of Android you have to use older methods of signing.

Hope this helps!

[khatauli]

Cherry,
Thanks for the reply, but I sense some confusion. I am not using very old version of Android.
I just developed my Ionic app using Ionic-3 (within last 3 months, and I am new to Android development), so I am not sure how I can be using the very old version of Android.

I just need to know where to go to, to find the latest documentation to publish (if there is any) for publishing a latest Ionic-3 app to latest Android!

[cherry]

Well it seems that you are using an older SDK, what you can do is to upgrade your SDK via the SDK manager.

What I would recommend you to get is this version else if this version gives you also errors try version 27:

After you installed the package make sure you got the Android SDK Built-tools also installed.

Then you can start with the Guide you already posted.

[khatauli]

I read that Google deprecated using RSA algorithm for building keystore.
Here is the link:

How to Migrate Your Android App’s Signing Key

Given this article, I have a feeling that this is the command which is
causing the problem.

keytool -genkey -v -keystore planetcal.keystore -alias PlanetCal -keyalg
RSA -keysize 2048 -validity 10000

For password: I used “Testing123”

Anyway, about my installed versions (I believe they are latest):
I installed Android Studio a few days back, and this is what I see at my
end, which looks fairly latest to me!

Also, the build tools version I am using for is 27.0.3 (For ZipAlign tool).