Detailed explanation of shape usage examples in android development

Use code to generate pictures, and the pictures can be changed at will, which is convenient and saves space. The following is an introduction to how to use shape to generate custom graphics.

Steps:

1. Create a new xml file under res/drawable;

2. Reference this xml file in the code in the same way as the picture.

The syntax for defining shape graphics is as follows:

<?xml version="1.0" encoding="utf-8"?>  
<shape  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape=["rectangle" | "oval" | "line" | "ring"]      //共有4种类型，矩形（默认）/椭圆形/直线形/环形  
    // 以下4个属性只有当类型为环形时才有效  
    android:innerRadius="dimension"     //内环半径  
    android:innerRadiusRatio="float"    //内环半径相对于环的宽度的比例，比如环的宽度为50,比例为2.5,那么内环半径为20  
    android:thickness="dimension"   //环的厚度  
    android:thicknessRatio="float"     //环的厚度相对于环的宽度的比例  
    android:useLevel="boolean">    //如果当做是LevelListDrawable使用时值为true，否则为false.  
  
    <corners    //定义圆角  
        android:radius="dimension"      //全部的圆角半径  
        android:topLeftRadius="dimension"   //左上角的圆角半径  
        android:topRightRadius="dimension"  //右上角的圆角半径  
        android:bottomLeftRadius="dimension"    //左下角的圆角半径  
        android:bottomRightRadius="dimension" />    //右下角的圆角半径  
  
    <gradient   //定义渐变效果  
        android:type=["linear" | "radial" | "sweep"]    //共有3中渐变类型，线性渐变（默认）/放射渐变/扫描式渐变  
        android:angle="integer"     //渐变角度，必须为45的倍数，0为从左到右，90为从上到下  
        android:centerX="float"     //渐变中心X的相当位置，范围为0～1  
        android:centerY="float"     //渐变中心Y的相当位置，范围为0～1  
        android:startColor="color"      //渐变开始点的颜色  
        android:centerColor="color"     //渐变中间点的颜色，在开始与结束点之间  
        android:endColor="color"    //渐变结束点的颜色  
        android:gradientRadius="float"  //渐变的半径，只有当渐变类型为radial时才能使用  
        android:useLevel=["true" | "false"] />  //使用LevelListDrawable时就要设置为true。设为false时才有渐变效果  
  
    <padding    //内部边距  
        android:left="dimension"  
        android:top="dimension"  
        android:right="dimension"  
        android:bottom="dimension" />  
  
    <size   //自定义的图形大小  
        android:width="dimension"  
        android:height="dimension" />  
  
    <solid  //内部填充颜色  
        android:color="color" />  
  
    <stroke     //描边  
        android:width="dimension"   //描边的宽度  
        android:color="color"   //描边的颜色  
        // 以下两个属性设置虚线  
        android:dashWidth="dimension"   //虚线的宽度，值为0时是实线  
        android:dashGap="dimension" />      //虚线的间隔  
</shape>

The following are a few examples:

1. Rounded rectangle, scanning gradient

<?xml version="1.0" encoding="utf-8"?>  
<shape  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="rectangle"  
    android:useLevel="false" >  
  
    <corners  
        android:topLeftRadius="10dp"  
        android:topRightRadius="10dp"  
        android:bottomLeftRadius="10dp"  
        android:bottomRightRadius="10dp" />  
  
    <gradient  
        android:type="sweep"  
        android:endColor="@android:color/holo_blue_bright"  
        android:startColor="@android:color/holo_green_dark"  
        android:centerColor="@android:color/holo_blue_dark"  
        android:useLevel="false" />  
  
    <size android:width="60dp" android:height="60dp" />  
</shape>

Result:

##2 . Circle, linear gradient

<?xml version="1.0" encoding="utf-8"?>  
<shape  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="oval"  
    android:useLevel="false" >  
  
    <gradient  
        android:type="linear"  
        android:angle="45"  
        android:startColor="@android:color/holo_green_dark"  
        android:centerColor="@android:color/holo_blue_dark"  
        android:endColor="@android:color/holo_red_dark"  
        android:useLevel="false" />  
  
    <size android:width="60dp" android:height="60dp" />  
  
    <stroke android:width="1dp"  
        android:color="@android:color/white" />  
  
</shape>

Result:

#3. Dashed line

<?xml version="1.0" encoding="utf-8"?>  
<shape  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="line" >  
  
    <size android:width="60dp"  
        android:height="60dp" />  
  
    <stroke android:width="2dp"  
        android:color="@android:color/holo_purple"  
        android:dashWidth="10dp"  
        android:dashGap="5dp" />  
</shape>

Result:

##4. Ring, Radial gradient

<?xml version="1.0" encoding="utf-8"?>  
<shape  
    xmlns:android="http://schemas.android.com/apk/res/android"  
    android:shape="ring"  
    android:useLevel="false"  
    android:innerRadius="40dp"  
    android:thickness="3dp">  
  
    <gradient android:type="radial"  
        android:gradientRadius="150"  
        android:centerY="0.1"  
        android:centerX="0.2"  
        android:startColor="@android:color/holo_red_dark"  
        android:centerColor="@android:color/holo_green_dark"  
        android:endColor="@android:color/white" />  
  
    <size android:width="90dp"  
        android:height="90dp" />  
  
</shape>

Result:

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