Directory structure
About directory structure
Usually one project is created for one Android application. Here we will explain the file structure within that project.
Where should I put my assets?
When I create a new project in Android Studio, there is no assets folder inside the project. Place static images, videos, DB files, etc. in this folder. This assets folder is usually placed directly under the app folder. To create this folder, right-click on the app folder and a menu will appear, so select a 
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Reference materials https://www.geeksforgeeks.org/assets-folder-in-android/
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