Android: Center ImageButton in LinearLayout

Question

How can I center ImageButton in the this LinearLayout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/main"
>

ImageButton

              <ImageButton android:id="@+id/btnBut"
                      android:background="@drawable/button"
                      android:layout_width="wrap_content"
                      android:layout_height="wrap_content" />

I don't want to use fixed sizes.

Thanks

Answer 1

Use android:layout_gravity attribute:

 <ImageButton android:id="@+id/btnBut"
    android:background="@drawable/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center" />