Themes folder for my app is missing in android studio

If the "themes" folder is missing in your Android Studio project, you can create it manually.
Here are the steps:

1. Right-click on the "res" folder in your project and select "New" -> "Android resource directory".
2. In the "Resource type" drop-down menu, select "values".
3. In the "Directory name" field, enter "themes" and click "OK".
4. In the "themes" folder, you can create a new "themes.xml" file by right-clicking on the folder and selecting "New" -> "Values resource file".