How to install Android applications repeatedly without uninstalling previous versions?

I'm working on an Android project. I have to install it many times to test it on the virtual device. But at the end of yesterday, I couldn't reinstall the application on the virtual device. This morning, I found a solution. I just need to uninstall and reinstall the application. This applies to me, but now I have to uninstall and reinstall it every time if I want to test

So is there any solution to make it work as before? Install the application again and again without uninstalling it

resolvent:

ADB install - R appname.apk – - R option means to replace the existing application. If - R is not used, the version in the list must be increased to install at the top of the previous version