(转) 自定义控件的自定义的属性 attrs.xml 下的 declare-styleable 中 format 详解 – 热爱改变生活
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(转) 自定义控件的自定义的属性 attrs.xml 下的 declare-styleable 中 format 详解

Android组件 sinvader 2018℃ 0评论

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)

CustomViewPic

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>

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"
/>

原文是真不知道哪个是了,网上太多一样的。。我是从 这里 转的,这个有图片

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