How can I place a button over other buttons in a linear layout?

edit

You can use the android:layout_gravity attribute and set it to center for the button that you want to place over other buttons. Here is an example code snippet:

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 1"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 2"
        android:layout_gravity="center"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button 3"/>

</LinearLayout>

In the above code, the android:layout_gravity attribute is set to center for the second button, which will place it in the center of the linear layout and on top of the other buttons.