android中如何使用layer-list

<layer-list xmlns:android="http://schemas.android.com/apk/res/android"><!--<item> <shape android:shape="rectangle"> <solid android:color="#EEE8AA" /> <corners android:radius="10dip"/> android:topLeftRadius="5dip" android:topRightRadius="5dip" android:bottomLeftRadius="5dip" android:bottomRightRadius="5dip" </shape> </item> --><item><!-- android:top="1px" android:bottom="1px" android:left="1px" android:right="1px" --><shape android:shape="rectangle"><gradient android:startColor="#FF000000" android:endColor="#FF696969"android:type="linear" android:angle="90" /><!-- android:centerX="0.5" android:centerY="0.5" --><corners android:radius="5dip" /><padding android:left="10dp" android:top="10dp"android:right="10dp" android:bottom="10dp" /></shape></item></layer-list>