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kapil joshi138 Points
using tools namespace in xml
why we use tools namespace in xml doc instead of android namespace?
We use the tools namespace when we want to see how something would look on our preview, but we don't want the app to look that way when we actually run it.
It's useful for example text that you don't want to be the default text, or visibility of a view when it closely matches the background, that type of thing.
I hope that helps!