Android自定义View中attrs.xml的实例详解

Android自定义View中attrs.xml的实例详解

我们在自定义View的时候通常需要先完成attrs.xml文件

在values中定义一个attrs.xml 然后添加相关属性

这一篇先详细介绍一下attrs.xml的属性。

<?xml version="1.0" encoding="utf-8"?>
<resources>
  //自定义属性名,定义公共属性
  <attr name="titleText" format="string"/>
  <attr name="titleTextSize" format="dimension"/>
  <attr name="titleTextColor" format="color"/>
  <attr name="image" format="reference"/>
  <attr name="imageScaleType" >
    <enum name="fillXY" value="0"/>
    <enum name="center" value="1"/>
  </attr>

  //自定义控件的主题样式
  <declare-styleable name="CustomImageView">
    <attr name="titleText" />
    <attr name="titleTextSize" />
    <attr name="titleTextColor" />
    <attr name="image" />
    <attr name="imageScaleType" />
  </declare-styleable>

</resources>

reference：参考某一资源ID。

定义：

<declare-styleable name = "名称">
          <attr name = "background" format = "reference" />
</declare-styleable>

使用：

<ImageView
           android:layout_width = "42dip"
           android:layout_height = "42dip"
           android:background = "@drawable/图片ID"
           />

color：颜色值

定义：

<declare-styleable name = "名称">
          <attr name = "textColor" format = "color" />
      </declare-styleable>

使用：

<TextView
          android:layout_width = "42dip"
          android:layout_height = "42dip"
          android:textColor = "#00FF00"
          />

boolean：布尔值

定义：

<declare-styleable name = "名称">
        <attr name = "focusable" format = "boolean" />
</declare-styleable>

使用：

<Button
          android:layout_width = "42dip"
          android:layout_height = "42dip"
          android:focusable = "true"/>

dimension：尺寸值

定义：

<declare-styleable name = "名称">
          <attr name = "layout_width" format = "dimension" />
</declare-styleable>

使用：

<Button
          android:layout_width = "42dip"
          android:layout_height = "42dip"
         />

float：浮点值

定义：

<declare-styleable name = "AlphaAnimation">
          <attr name = "fromAlpha" format = "float" />
          <attr name = "toAlpha" format = "float" />
</declare-styleable>

使用：

<alpha
    android:fromAlpha = "1.0"
    android:toAlpha = "0.7"
/>

integer：整型值

定义：

<declare-styleable name="RotateDrawable">
          <attr name = "visible" />
          <attr name = "fromDegrees" format = "float" />
          <attr name = "toDegrees" format = "float" />
          <attr name = "pivotX" format = "fraction" />
          <attr name = "pivotY" format = "fraction" />
          <attr name = "drawable" />
</declare-styleable>

使用：

<rotate
         xmlns:android = "http://schemas.android.com/apk/res/android"
　　       android:interpolator = "@anim/动画ID"
         android:fromDegrees = "0"
　　       android:toDegrees = "360"
         android:pivotX = "200%"
         android:pivotY = "300%"
　　       android:duration = "5000"
         android:repeatMode = "restart"
         android:repeatCount = "infinite"
        />

enum：枚举值

定义：

<declare-styleable name="名称">
          <attr name="orientation">
             <enum name="horizontal" value="0" />
             <enum name="vertical" value="1" />
          </attr>
</declare-styleable>

使用：

<LinearLayout
          xmlns:android = "http://schemas.android.com/apk/res/android"
          android:orientation = "vertical"
          android:layout_width = "fill_parent"
          android:layout_height = "fill_parent"
          >
</LinearLayout>

flag：位或运算

<declare-styleable name="名称">
          <attr name="windowSoftInputMode">
              <flag name = "stateUnspecified" value = "0" />
              <flag name = "stateUnchanged" value = "1" />
              <flag name = "stateHidden" value = "2" />
              <flag name = "stateAlwaysHidden" value = "3" />
              <flag name = "stateVisible" value = "4" />
              <flag name = "stateAlwaysVisible" value = "5" />
              <flag name = "adjustUnspecified" value = "0x00" />
              <flag name = "adjustResize" value = "0x10" />
              <flag name = "adjustPan" value = "0x20" />
              <flag name = "adjustNothing" value = "0x30" />
          </attr>
lt;/declare-styleable>

使用：

<activity
   android:name = ".StyleAndThemeActivity"
   android:label = "@string/app_name"
   android:windowSoftInputMode = "stateUnspecified | stateUnchanged　|　stateHidden">
   <intent-filter>
      <action android:name = "android.intent.action.MAIN" />
      <category android:name = "android.intent.category.LAUNCHER" />
   </intent-filter>
</activity>

属性定义时可以指定多种类型值

定义：

<declare-styleable name = "名称">
   <attr name = "background" format = "reference|color" />
</declare-styleable>

使用：

<ImageView
    android:layout_width = "42dip"
    android:layout_height = "42dip"
    android:background = "@drawable/图片ID|#00FF00"
    />

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