how i change background for all activity android -

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I put an image for all the activity in my app (in style.xml ...). How can I change the background for all my activities dynamically, is it possible to change the properties of a theme dynamically?

Thank you for your help

/ P> 

  getWindow () can change setBackgroundDrawable (...); . GetWindow () setBackgroundDrawableResource (...);

See the docs.


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