Android: When I try to install my signed app, it says “App not installed”

Question

When I try to install a signed apk file, the application installer says \"App not installed\".
It happens to every app that I have made. Even if I create a brand new k

Answer 1

Check if in guests account(if you are emulating in android 5.0+) the app is installed or not, if yes then remove it and re-install from IDE.

Answer 2

Since you already have enabled installation from 'unknown sources'

Taking from 'App not Installed' Error on Android

This error also occurs when trying to install an apt on a phone with a previous version of the same apt and both asks aren't signed with the same certificate, so you might wanna check if you used it previously that you used the same certificate. One way to ensure this is to uninstall all previous versions and install the new signed apk