Question about DP in Android

Let's say I prefer using "dp" rather than "fill_parent" or "wrap_content", what would be the appropr开发者_JAVA百科iate number to use in order to fill the screen with a picture?

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This depends of the screen and of its density. Check this article to learn more about that.

(This may lead you to reconsider using fill_parent / wrap_content by the way).

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Why would you "prefer" this? Precise dp values for layout_width/layout_height are one tool alongside match_parent and wrap_content and building a nice UI will usually involve all three. Which one is appropriate for each dimension of any given View is situational and match_parent's entire reason for existence is to match the size of a View's container, in your case the screen.

(* match_parent is the newer name for fill_parent.)