It is assumed that you have gone through Android Hello world! and you know how to create a sample App on your device already.
This page shows you how to add resource (image) to your Android App.
(start) Android Studio >> (create) New Project >> (choose) Empty Activity
Resource Manager Tab (Left Side Window) >> Drawable >> ” +” sign (Add Resource to the module).
Choose Import Drawables
Choose Density of Image.
Here, image resource is only imported to your project from external file system. It is yet to be added into your App.
Layout >> Double Click on activity_main
The imported Image Resource is now added to the layout "BUT!!" it is not aligned yet. Image has 4 edges. Pick each edge of image using mouse and drag till end of layout screen. Repeat for each edge. This will make your image dockable anywhere on layout.
Congratulations! Your image resource is now added on your app running on your mobile device.