Set two buttons to same width regardless of screen size?

Use android:layout_weight="1" on both Buttons. Set android:layout_width="0dp" on both. Since both buttons now have equal weighting, they will now each have half the parent's width.

You can find out more here: http://developer.android.com/guide/topics/ui/layout/linear.html

If what you're looking to do is to make all the buttons the width of the widest button, setting weights isn't going to do that. Rather, you can put all the buttons in a TableLayout:

   <TableLayout 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <Button
                android:id="@+id/button1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/short_text" />
        </TableRow>

        <TableRow
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" >

            <Button
                android:id="@+id/button2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/enter_manually" />
        </TableRow>
    </TableLayout>

This layout will show 2 buttons, one on top of the other, the same width.