Detailed introduction to using XML resource files to define colors, styles, etc.

1. Use XML resource files to define colors. This method has good scalability and is easy to modify and share. For example, create a color.xml in the values ​​directory.

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="mycolor">#ffb52121</color> 
</resources>

defines a color named mycolor. You can get the color value by referencing mycolor elsewhere, such as

textView definition:

Android:textColor="@drawable/mycolor"

2. Use XML resource files to define styles and define a shape in res/drawable. xml file

Example code:

<?xml version="1.0" encoding="utf-8"?>  
<shape xmlns:android="http://schemas.android.com/apk/res/android" >  
  
    <corners android:radius="5dp" />  
  
    <size  
        android:height="30dp"  
        android:width="20dp" />  
  
    <gradient   
        android:startColor="#9933cc"  
        android:endColor="#aa66cc"  
        android:angle="90"  
        />  
      
    <padding android:left="5dp"  
        android:right="5dp"  
        android:top="5dp"  
        android:bottom="5dp"/>  
  
</shape>  
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
 
    <!-- 填充的颜色：这里设置背景透明 -->
    <solid android:color="@android:color/transparent" />
    <!-- 边框的颜色 ：不能和窗口背景色一样-->
    <stroke
        android:width="3dp"
        android:color="#ffffff" />
    <!-- 设置按钮的四个角为弧形 -->
    <!-- android:radius 弧形的半径 -->
    <corners android:radius="5dip" />
 
    <!-- padding：Button里面的文字与Button边界的间隔 -->
    <padding
        android:bottom="10dp"
        android:left="10dp"
        android:right="10dp"
        android:top="10dp" />
</shape>

Define the button

<Button
    android:id="@+id/roundButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/shape"
    android:text=" 圆角按钮 " />

Shape attributes in your Activity’s xml (such as activity_main.xml):

solid

Description: Internal padding

Attribute: android:color Fill color

Size

Description: Size

Attributes:

     android:width 宽
                 android:height 高

gradient

Description: Gradient color

Attributes:

     android:startColor渐变起始颜色
                   android:endColor渐变结束颜色
                   android:centerColor渐变中间颜色
                   android:angle 渐变的角度，angle=0时，渐变色是从左向右，然后逆时针方向转；当angle=90时，渐变色从上往下。angle必然是45的倍数
                   android:type 渐变类型：linear(线性)、radial(放射性，以开始色为中心)、sweep(扫描线式渐变)
                   android:userLevel如果要使用LevelListDrawable对象，就要设置为true。设置true无渐变色，false有渐变色
                   android:grdientRadial渐变半径，只有设置type为radial时，此值才生效
                   android:centerX 渐变中心X点坐标的相对位置
                   android:centerY 渐变中心Y点坐标的相对位置

stroke

Description: Stroke

Attributes:

     android:width 描边宽度
                   android:color 描边颜色
                   android:dashwidth描边样式为虚线时的宽度，值为0时为实线，值大于0时为虚线
                   android:dashGap 描边为虚线时，虚线之间的间隔

corners

Description: Rounded corners

Attributes:

       android:radius 四个角半径值
                   android:topLeftRadius左上角半径值
                   android:topRightRadius右上角半径值
                   android:bottomLeftRadius右下角半径值
                   android:bottomRightRadius左下角半径值

padding

Description: Padding

Attributes:

 android:left 左内边距
                   android:right 右内边距
                   android:top 上内边距
                   android:bottom 下内边距：

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