Android 自定义控件之第一讲：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">
"background" format = "reference" />
declare-styleable> - 1
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（2）属性使用：
"42dip"
android:layout_height = "42dip"
android:background = "@drawable/图片ID"/> - 1
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2. color：颜色值。
（1）属性定义：
<declare-styleable name = "名称">
"textColor" format = "color" />
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（2）属性使用：
"42dip"
android:layout_height = "42dip"
android:textColor = "#00FF00"/> - 1
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3. boolean：布尔值。
（1）属性定义：
<declare-styleable name = "名称">
"focusable" format = "boolean" />
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（2）属性使用：
<Button
android:layout_width = "42dip"
android:layout_height = "42dip"
android:focusable = "true"/>- 1
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4. dimension：尺寸值。
（1）属性定义：
<declare-styleable name = "名称">
"layout_width" format = "dimension" />
declare-styleable> - 1
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（2）属性使用：
<Button
android:layout_width = "42dip"
android:layout_height = "42dip"/>- 1
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5. float：浮点值。
（1）属性定义：
name = "AlphaAnimation">
name = "fromAlpha" format = "float" />
name = "toAlpha" format = "float" />
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（2）属性使用：
"1.0"
android:toAlpha = "0.7"/> - 1
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6. integer：整型值。
（1）属性定义：
name = "AnimatedRotateDrawable">
name = "visible" />
name = "frameDuration" format="integer" />
name = "framesCount" format="integer" />
name = "pivotX" />
name = "pivotY" />
name = "drawable" />
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（2）属性使用：
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"/> - 1
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7. string：字符串。
（1）属性定义：
<declare-styleable name = "MapView">
"apiKey" format = "string" />
declare-styleable> - 1
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（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"/>- 1
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8. fraction：百分数。
（1）属性定义：
name="RotateDrawable">
name = "visible" />
name = "fromDegrees" format = "float" />
name = "toDegrees" format = "float" />
name = "pivotX" format = "fraction" />
name = "pivotY" format = "fraction" />
name = "drawable" />
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（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"/>- 1
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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>- 1
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（2）属性使用：
"http://schemas.android.com/apk/res/android"
android:orientation = "vertical"
android:layout_width = "fill_parent"
android:layout_height = "fill_parent">
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10. flag：位或运算。
（1）属性定义：
name="名称">
name="windowSoftInputMode">
name = "stateUnspecified" value = "0" />
name = "stateUnchanged" value = "1" />
name = "stateHidden" value = "2" />
name = "stateAlwaysHidden" value = "3" />
name = "stateVisible" value = "4" />
name = "stateAlwaysVisible" value = "5" />
name = "adjustUnspecified" value = "0x00" />
name = "adjustResize" value = "0x10" />
name = "adjustPan" value = "0x20" />
name = "adjustNothing" value = "0x30" />
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（2）属性使用：
name = ".StyleAndThemeActivity"
android:label = "@string/app_name"
android:windowSoftInputMode = "stateUnspecified | stateUnchanged | stateHidden">
name = "android.intent.action.MAIN" />
name = "android.intent.category.LAUNCHER" />
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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">
"background" format = "reference|color" />
declare-styleable> - 1
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（2）属性使用：
"42dip"
android:layout_height = "42dip"
android:background = "@drawable/图片ID|#00FF00"
/> - 1
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