Android designing should be done with specific ratio so that it vary with different devices and adjust its size according to that. Try to use weight property, wrap content or match parent. Donít use numeric value, its static so it is only for your device and in other devices it changes
I strongly suggest you to visit this page to know basics of android app designing.. developer.android.com/training/multiscreen/index.html
[Note : if you know basics already, take a closer look into the page. Its still inspiring]
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