自定义View的declare-styleable中format详解

自定义View

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本文转载自CSDN博客，并进行了编辑

我们在做项目的时候，由于android自带的属性不能满足需求，android提供了自定义属性的方法，其中的format是做什么用的？以及如何使用它？下面列出一些常用的。

reference：参考某一资源ID。

（1）属性定义：

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

（2）属性使用：

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

color：颜色值。

（1）属性定义：

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

（2）属性使用：

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

boolean：布尔值。

（1）属性定义：

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

（2）属性使用：

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

dimension：尺寸值。

    （1）属性定义：
            <declare-styleable name = "名称">
                   <attr name = "layout_width" format = "dimension" />
            </declare-styleable>

（2）属性使用：

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

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
       android:fromAlpha = "1.0"
       android: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" 
       android:drawable = "@drawable/图片ID" 
       android:pivotX = "50%" 
       android:pivotY = "50%" 
       android:framesCount = "12" 
       android:frameDuration = "100"
       />

string：字符串。

（1）属性定义：

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

（2）属性使用：

<com.google.android.maps.MapView
        android:layout_width = "fill_parent"
        android:layout_height = "fill_parent"
        android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"
        />

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

（2）属性使用：

<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。

（1）属性定义：

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

（2）属性使用：

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