Could i sell an Android App?
If i have an App, which is developed with Qt framework, could i sell this at google play store or i need a special license ?
AFAIK, yes, but you have to be compliant with the corresponding licenses depending on which version of Qt you are using. See the download page for more information.
thanx, and if my App is not good and i earn less money as i have to pay for the license ? what can i do?
How can i change the package name of the app, because now it is the org.qtproject.example ?
What you earn with your application and its quality as nothing to do with licensing.
Look here for the deployment part
@xmaze Would you request same arrangement if you were developing apps using Visual Studio, Android Studio or XCode? ;)