I want to create an Android ImageButton in the xml file with a background image, and a smaller icon on top of that, right in the center. For some reason, it's not obvious how to do it, and documentation is no help.
<ImageButton android:id="@+id/sound_button" android:layout_x="430px" android:layout_y="219px" android:layout_width="48px" android:layout_height="48px" android:scaleType="center" android:src="@android:drawable/volumeicon" android:background="@drawable/clearbuttonup" />
However, no matter what I try (putting "wrap _ content" instead of absolute numbers on layout _ height and layout _ width, the icon remains in the top left corner of the button. If, however, I have no background image (i.e. a system default white button), the icon does go into the center. The button also goes into the top left corner when I use a color instead of an image for the background.
Why does this happen, and how would I actually get the behavior I want– that is, a background image with the icon in the center?