XML Drawable

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android把任何可绘制在屏幕上的图形图像都称为drawable.

XML drawable与像素密度无关，将其放入drawable目录即可。

一、shape drawable

<shape xmlns:android="http://schemas.android.com/apk/res/android"    android:shape="rectangle">    <corners android:radius="3dp"/>    <gradient android:angle="270"              android:endColor="#cccccc"              android:startColor="#acacac"/></shape>

二、state list drawable

<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:drawable="@drawable/button_shape_normal"      android:state_pressed="false"/>    <item android:drawable="@drawable/button_shape_pressed"          android:state_pressed="true"/></selector>

<selector xmlns:android="http://schemas.android.com/apk/res/android"><item android:color="#ffffff"      android:state_pressed="false"/>    <item android:color="#556699"          android:state_pressed="true"/></selector>

三、layer list 与 inset drawable

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">    <item>        <shape android:shape="rectangle">            <corners android:radius="5dp"/>            <gradient android:angle="90"                android:centerColor="#303339"                android:centerY="0.05"                android:endColor="#000000"                android:startColor="#000000"/>        </shape>    </item>    <item>        <inset android:drawable="@drawable/button_shape"               android:insetBottom="5dp"/>    </item></layer-list>

效果：出现阴影

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