Different border width for button

how can I set different width for a button on android? Like top and bottom are 2dp but le开发者_运维技巧ft and right are 4dp? Thank you.

Update:

My apology if my question is unclear. It is not margin or padding. But I would like to customise the width like border-top or border-left in css. Is it possible in android?

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Your question is not clear.Are you looking something like following?

<Button 
android:text="Button"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp" 
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
android:id="@+id/button1" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content">
</Button>