Question

I would to know how to have a border to separate my buttons
in my xml file.
Could someone please help me?

Answer 1

Use a LinearLayout with no children and a height of 1 DP (assuming you are separating them vertically)

<Button android:id="@+id/button1" />

<LinearLayout android:layout_width="fill_parent"
    android:layout_height="1dp"
    android:background="@color/white"/> <!-- Or #FFFFFF -->

<Button android:id="@+id/button2" />

You can play with other options but this should give you a basic idea of what (I think) you’re looking for. Try elaborating and showing some sample code for future question so we can understand your problem and help more!