declare-styleable中format详解

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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。
在自定义控件中declare-styleable标签下我们经常需要使用一些自定义控件需要的属性：

<attr name = "background" format = "reference" /> android:background = "@drawable/图片ID" <attr name = "textColor" format = "color" /> android:textColor = "#00FF00" <attr name = "focusable" format = "boolean" /> android:focusable = "true" <attr name = "layout_width" format = "dimension" /> android:layout_width = "42dp"<attr name = "fromAlpha" format = "float" />android:fromAlpha = "1.0"<attr name = "frameDuration" format="integer" /> android:frameDuration = "1000"  <attr name = "apiKey" format = "string" />android:apiKey = "defa2312312sdas9uGXCRiS2CGjKO_bc_g"<attr name = "pivotX" format = "fraction" /> android:pivotY = "300%"<attr name="orientation"> <enum name="horizontal" value="0" /> <enum name="vertical" value="1" /></attr>           android:orientation = "vertical"<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>         <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>

特别要注意：属性定义时可以指定多种类型值。
<attr name = "background" format = "reference|color" />
android:background = "@drawableic_launcher|#00FF00"

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