You can fake it by making a more complex layout, but I’m not sure whether it’s worth it. Here’s something I hacked together:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<Button
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:layout_alignTop="@+id/foreground"
android:layout_alignBottom="@id/foreground"
android:layout_alignRight="@id/foreground"
android:layout_alignLeft="@id/foreground"
android:onClick="clickedMe" />
<RelativeLayout
android:id="@id/foreground"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/button_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="@string/hello" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toLeftOf="@id/button_text"
android:paddingTop="10dip"
android:paddingBottom="10dip"
android:src="https://stackoverflow.com/questions/4817449/@drawable/icon" />
</RelativeLayout>
</RelativeLayout>
There might be a more concise way to do it. I tend to struggle getting RelativeLayout to do what I want sometimes. Note that you need to pay attention to the z-order (Button needs to appear first in the top level RelativeLayout) and you might need to adjust padding to get it to look the way you want.