【Android】Android自定义属性，attr format取值类型

1. 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"/>

2. 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"/>

3. 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"/>

4. 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"/>

5. 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"/>

6. 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"/>

7. 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"/>

8. 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"
/>

9. 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>

10. 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>        

注意：

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"/>