<?xml version="1.0" encoding="utf-8"?>
<!--antialias:抗锯齿-->
<!--dither:抖动-->
<!--src:图片的地址-->
<!--tileMode：平铺模式；
可选值：
disable:关闭平铺模式
repeat:水平和垂直方向平铺
mirror:水平和垂直方向平铺的基础上加上倒影
clamp:四周扩散到周围区域-->
<bitmap
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:src="@drawable/wifi"
    android:antialias="true"
    android:dither="true"
    android:gravity="center"
    android:tileMode="repeat"
    > 
</bitmap>

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
       android:shape="rectangle"><!--选择形状-->
       <!--angle:渐变角度，必须为45的倍数-->
       <!--type:渐变类别，可选值：linear:线性渐变;radial:径向渐变；sweep:扫描线渐变-->
    <gradient
        android:angle="45"  
        android:centerX="100"
        android:centerY="100"
        android:startColor="#ff0000"
        android:centerColor="#ffff00"
        android:endColor="#66ffff"
        android:type="linear"/>
    <stroke
        android:width="5dp"
        android:color="#000000"
        android:dashWidth="2dp"
        android:dashGap="3dp"/>
</shape>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android"
          android:constantSize="false"
          android:dither="true"
          android:variablePadding="false">
    <!--按下时的状态-->
    <item
        android:state_pressed="true"
        android:drawable="@drawable/zreo"/>
    <!--获取焦点时的状态-->
    <item
        android:state_focused="true"
        android:drawable="@drawable/one"/>
    <!--普通时刻状态-->
    <item
        android:drawable="@drawable/two"/>
</selector>

<?xml version="1.0" encoding="utf-8"?>
<level-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item
        android:drawable="@drawable/zero"
        android:maxLevel="0"/>
    <item
        android:drawable="@drawable/one"
        android:maxLevel="1"/>
    <item
        android:drawable="@drawable/two"
        android:maxLevel="2"/>
</level-list>

<scale xmlns:android="http://schemas.android.com/apk/res/android"
    android:drawable="@drawable/no"
    android:scaleGravity="center"
    android:scaleWidth="60%"
    android:scaleHeight="60%">
</scale>

View scale = findViewById(R.id.test);
        ScaleDrawable scaleDrawable = (ScaleDrawable) scale.getBackground();
        scaleDrawable.setLevel(5000);

<!--clipOrientation:裁剪方向-->
<clip xmlns:android="http://schemas.android.com/apk/res/android"
      android:drawable="@drawable/not"
      android:clipOrientation="vertical"
      android:gravity="center">
</clip>

 ImageView scale = (ImageView) findViewById(R.id.test);
        ClipDrawable clipDrawable = (ClipDrawable) scale.getDrawable();
        clipDrawable.setLevel(5000);