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"

/>

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">
<enumname="horizontal" value="0" />
<enumname="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">
<flagname = "stateUnspecified" value = "0" />
<flagname = "stateUnchanged" value = "1" />
<flagname = "stateHidden" value = "2" />
<flagname ="stateAlwaysHidden" value = "3" />
<flagname = "stateVisible" value = "4" />
<flagname = "stateAlwaysVisible" value = "5" />
<flagname = "adjustUnspecified" value = "0x00" />
<flagname = "adjustResize" value = "0x10" />
<flagname = "adjustPan" value = "0x20" />
<flagname = "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>

特别要注意:

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"

/>


原文链接: http://blog.csdn.net/hopezhangbo/article/details/7400091

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