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In many applications, I have seen that there is a welcome screen or tutorial that explains how the application works by overlaying explanations on top of the activity. For instance, in Android itself, the welcome screen with "Make yourself home".
I would like to know what techniques can be used for that.
Edit: screenshot of "make yourself home 
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An overlay is an extra layer that sits on top of a View (the "host view") which is drawn after all other content in that view (including children, if the view is a ViewGroup). Interaction with the overlay layer is done by adding and removing drawables.
Open your base image in Photoshop, and add your secondary images to another layer in the same project. Resize, drag, and drop your images into position. Choose a new name and location for the file. Click Export or Save.
There are now 3 alternatives for displaying some tutorial of an activity :
The first one being the best of the 3.
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