I success to compile and install an application develop using b4a on my cellphone, but some of my colleagues' cellphones failed to install the same application
please tell me what to do in order to success install same application on my my colleagues' cellphones
I don't know how you produced that apk but it is only signed with a V1 signature and will not install on later Android devices. Are you using an old version of B4A? If so you need to update to the latest.
Just received an email from google play update that contains informations about the new target sdk requirements starting August 2021. it also mention this : Apps that target Android 11 (API level ...
I already told you why above in post #4. Your example apk is only signed with a V1 signature. If you have not corrected that it will not install on newer versions of Android.
With B4A 11.80 and the latest SDK I don't know why your example in the first post is not fully signed. Compile a new empty project and post the apk and let's see if that is fully signed - otherwise Erel might have to have a guess at what's wrong.