[APP][Android Studio] How to make buttons that are rounded on only one side? - Android Q&A, Help & Troubleshooting

Hi XDA community
Currently I'm trying to implement a simple add-subtract button pair into my app, but for it to look how I want it to, I need to round only the left edges for the left button and only the right edges for the right button.
Also, once a certain limit is reached (f.e. you can keep adding 1 until you reach 10 / you can keep subtracting 1 until you reach 0), the corresponding button should gray out.
Here's a sketch of how I want it to look like:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I can handle the logic for the adding, subtracting and graying out, but for the selective edge-rounding I've found nothing so far.
Can you help me?

---

So I just asked a classmate and the answer is pretty elegant.
You first need to create a new layout resource file with a <shape> element as the base.
Then, you use "android:topLeftRadius" and the like to make a shape and pass it to the button like this: 'android:background="@drawable/rounded_button_left"' with "rounded_button_left" being the filename of my layout resource file.
Hope I could help someone