Here is an example of an app that used XML to design button.
How can i have the same
design with XML
look like it is floating
I think you will need to use a shape drawable with a layered list, here is an example of a button that has a different color on the top and bottom (the drop shadow effect). You will set this as the background attribute of the Button.
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<corners android:radius="2dp" />
<solid android:color="@color/button_border_dark" />
</shape>
</item>
<item android:top="1dp">
<shape android:shape="rectangle" >
<corners android:radius="2dp" />
<solid android:color="@color/button_border_light" />
</shape>
</item>
<item
android:bottom="1dp"
android:top="1dp">
<shape android:shape="rectangle" >
<corners android:radius="2dp" />
<solid android:color="@color/button_general_color" />
</shape>
</item>
</layer-list>