android:background="@drawable/home_tab_bg"
home_tab_bg/xml:
<bitmap xmlns:android="http://schemas.android.com/apk/res/android" android:dither="true" android:src="@drawable/main_tab_bg" android:tileMode="repeat" > </bitmap>
android:background="@drawable/home_tab_bg"
原文：http://www.cnblogs.com/zhujiabin/p/5224966.html