java - Is there something wrong with my activity_main.xml? -

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i have noticed activity_main different others have seen on youtube.
there wrong mine?

mine blue while others have more realistic , different layout.

image

image

the videos in youtube had blank activity (as far have seen).the newer version of android studio (2.2.2 case) has empty , basic activity. in empty activity. hence beautiful blue ui instead of old look.like this


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