Android自定义属性：attr format取值类型

自定义Attrs详解

最新推荐文章于 2021-06-10 11:18:54 发布

转载最新推荐文章于 2021-06-10 11:18:54 发布 · 522 阅读

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本文介绍了Android中自定义Attrs的方法，包括reference、color、boolean等多种类型的属性定义与使用示例，帮助开发者更好地理解并运用自定义属性。

自定义attrs是format取值类型

reference：参考某一资源ID。

（1）属性定义：

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

（2）属性使用：

<CustomView
    Android:layout_width = "42dp"
    android:layout_height = "42dp"
    custom:background = "@drawable/图片ID"
 />

color：颜色值

（1）属性定义：

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

（2）属性使用：

<CustomView
     android:layout_width = "42dp"
     android:layout_height = "42dp"
     custom:textColor = "#00FF00"
     />

boolean：布尔值

（1）属性定义：

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

（2）属性使用：

<CustomView
     android:layout_width = "42dp"
     android:layout_height = "42dp"
     custom:focusable = "true"
     />

dimension：尺寸值

（1）属性定义：

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

（2）属性使用：

<CustomView
     custom:layout_width = "42dp"
     android:layout_height = "42dp"
     />

float：浮点值。

（1）属性定义：

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

（2）属性使用：

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

integer：整型值

（1）属性定义：

<declare-styleable name = "AnimatedRotateDrawable">
       <attr name = "visible" />
       <attr name = "frameDuration" format="integer" />
       <attr name = "framesCount" format="integer" />
       <attr name = "pivotX" />
       <attr name = "pivotY" />
       <attr name = "drawable" />
</declare-styleable>

（2）属性使用：

<animated-rotate
       xmlns:android = "http://schemas.android.com/apk/res/android"  
       custom:drawable = "@drawable/图片ID"  
       custom:pivotX = "50%"  
       custom:pivotY = "50%"  
       custom:framesCount = "12"  
       custom:frameDuration = "100"
       />

string：字符串

（1）属性定义：

<declare-styleable name = "CustomView">
       <attr name = "apiKey" format = "string" />
</declare-styleable>

（2）属性使用：

<CustomView
     android:layout_width = "match_parent"
     android:layout_height = "match_parent"
     custom:apiKey = "123"
     />

fraction：百分数

（1）属性定义：

<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>

（2）属性使用：

<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

（1）属性定义：

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

（2）属性使用：

<CustomView
        custom:orientation = "vertical"
        android:layout_width = "match_parent"
        android:layout_height = "match_parent"
        >
</LinearLayout>

flag：位或运算

（1）属性定义：

<declare-styleable name="CustomView">
       <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>         
</declare-styleable>

（2）属性使用：

<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

（1）属性定义：

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

（2）属性使用：

<CustomView
     android:layout_width = "match_parent"
     android:layout_height = "match_parent"
     custom:background = "@drawable/图片ID|#fff"
     />