Android自定义View中attrs.xml的实例详解
我们在自定义View的时候通常需要先完成attrs.xml文件
在values中定义一个attrs.xml 然后添加相关属性
这一篇先详细介绍一下attrs.xml的属性。
<?xml version="1.0" encoding="utf-8"?>
<resources>
//自定义属性名,定义公共属性
<attr name="titleText" format="string"/>
<attr name="titleTextSize" format="dimension"/>
<attr name="titleTextColor" format="color"/>
<attr name="image" format="reference"/>
<attr name="imageScaleType" >
<enum name="fillXY" value="0"/>
<enum name="center" value="1"/>
</attr>
//自定义控件的主题样式
<declare-styleable name="CustomImageView">
<attr name="titleText" />
<attr name="titleTextSize" />
<attr name="titleTextColor" />
<attr name="image" />
<attr name="imageScaleType" />
</declare-styleable>
</resources>
reference：参考某一资源ID。
定义：
<declare-styleable name = "名称">
<attr name = "background" format = "reference" />
</declare-styleable>
使用：
<ImageView
android:layout_width = "42dip"
android:layout_height = "42dip"
android:background = "@drawable/图片ID"
/>
color：颜色值
定义：
<declare-styleable name = "名称">
<attr name = "textColor" format = "color" />
</declare-styleable>
使用：
<TextView
android:layout_width = "42dip"
android:layout_height = "42dip"
android:textColor = "#00FF00"
/>
boolean：布尔值
定义：
<declare-styleable name = "名称">
<attr name = "focusable" format = "boolean" />
</declare-styleable>
使用：
<Button
android:layout_width = "42dip"
android:layout_height = "42dip"
android:focusable = "true"/>
dimension：尺寸值
定义：
<declare-styleable name = "名称">
<attr name = "layout_width" format = "dimension" />
</declare-styleable>
使用：
<Button
android:layout_width = "42dip"
android:layout_height = "42dip"
/>
float：浮点值
定义：
<declare-styleable name = "AlphaAnimation">
<attr name = "fromAlpha" format = "float" />
<attr name = "toAlpha" format = "float" />
</declare-styleable>
使用：
<alpha
android:fromAlpha = "1.0"
android:toAlpha = "0.7"
/>
integer：整型值
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>
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"
/>
enum：枚举值
定义：
<declare-styleable name="名称">
<attr name="orientation">
<enum name="horizontal" value="0" />
<enum name="vertical" value="1" />
</attr>
</declare-styleable>
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>
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>
lt;/declare-styleable>
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>
属性定义时可以指定多种类型值
定义：
<declare-styleable name = "名称"> <attr name = "background" format = "reference|color" /> </declare-styleable>
使用：
<ImageView
android:layout_width = "42dip"
android:layout_height = "42dip"
android:background = "@drawable/图片ID|#00FF00"
/>
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