Hai, I'm a newbie, just learn Android studio recently.
I have a problem with the script/source code that I got from Github.
Here are my troubles when I used Android studio.
1. When I created a new project (happy birthday card), it didn't show hello world in the virtual machine, it showed like when we turn on the phone. (Sometimes it showed, sometimes It's not.)
Note: I follow the tutorial as the developer android says. But unfortunately, I got that problem.
2. When I'm importing the script from GitHub (happy birthday card). It says that this source did not use Gradle. When I closed the app and created the new one, sometimes the script worked, but sometimes it did not.
3. Is there any setting that I missed in the android studio? And what about the Gradle, is there any way to automatically change the script/source code to using Gradle.
I need your help.

This is my first time learning programming and android studio. I just wish I could make apps myself. Even if it is just a happy birthday card app.


( I took a course from JetBrains about android development (kotlin) and took a course from developer android (google). Feels like my brain burst out.