Hi i have to develop one spinner app.
here how can i remove the default gray color border on android spinner item..please help me.

How can i remove the default border from this image.
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There aren’t a simple form to do that you want with code or other simple method
You must to create your own background for that spinner o use other theme — light, dark, holo … — I think Holo its a good solution.
If your app is developing for Android 3- you can use this https://github.com/ChristopheVersieux/HoloEverywhere to use Holo in every Android version 1-6+
Other solution is take the Android resources for that compoment and edit it with Gimp/photoshop and use the editing image.
I hope this help you