自定义控件的自定义的属性attrs.xml下的declare-styleable中form

最近在摸索自定义控件，查找到一些自定义属性的一些资料，解决转载记载下来：看了此详解才方便理解！

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。

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"

/>

配合示意图方便理解：（图片看不全请将图片下载保存本地查看）

2. color：颜色值。

<attr name = "textColor" format = "color" />

<TextView

android:layout_width = "42dip"
android:layout_height = "42dip"
android:textColor = "#00FF00"

3. boolean：布尔值。

<attr name = "focusable" format = "boolean" />

<Button

android:layout_width = "42dip"
android:layout_height = "42dip"

android:focusable = "true"

4. dimension：尺寸值。

<attr name = "layout_width" format = "dimension" />

5. float：浮点值。

<declare-styleable name = "AlphaAnimation">

<attr name = "fromAlpha" format = "float" />
<attr name = "toAlpha" format = "float" />

<alpha
android:fromAlpha = "1.0"
android:toAlpha = "0.7"

6. integer：整型值。

<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" />

<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。

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

<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。

<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>

<rotate

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。

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

<LinearLayout

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。

<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>

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

/>

（编辑：李大同）

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