android自定义控件

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android中自定义控件是很常见的，很多应用都会用到。这里总结一下。

1、首先建一个类继承布局文件(可以是Relativelayout、Linearlayout…)或View。重写构造函数。
2、在values目录下编写attrs.xml属性文件，里面写自定义控件用到的属性。
3、使用方法：在布局文件中xmlns:custom(名字无所谓)=”http://schemas.android.com/apk/res/项目包名”，这样就可以在控件中使用这些属性。

上面是大概步骤，下面具体细节

1、先说说属性：
在attrs.xml中写需要的属性：
declare-styleable name:自定义属性文件的名字，在自定义控件类中调用
attr name：属性名 format：是属性的数据类型
format属性多很多种类下面说明：

1、reference:资源ID

属性定义：<declare-styleable name = "名称">    <attr name = "background" format = "reference" /></declare-styleable>属性使用： <ImageView    android:layout_width = "42dip"    android:layout_height = "42dip"    android:background = "@drawable/图片ID"/>

2、 color：颜色值。

属性定义：<declare-styleable name = "名称">   <attr name = "textColor" format = "color" /> </declare-styleable>属性使用： <TextView    android:layout_width = "42dip"   android:layout_height = "42dip"   android:textColor = "#00FF00"    />

3、boolean：布尔值

属性定义：<declare-styleable name = "名称">    <attr name = "focusable" format = "boolean" /></declare-styleable>属性使用： <Button  android:layout_width = "42dip"  android:layout_height = "42dip"  android:focusable = "true"   />

4、dimension：尺寸

属性定义：<declare-styleable name = "名称">    <attr name = "layout_width" format = "dimension" /></declare-styleable>属性使用： <Button  android:layout_width = "42dip"  android:layout_height = "42dip"  android:focusable = "true"   />

5、float：浮点值

属性定义：<declare-styleable name = "名称">    <attr name = "fromAlpha" format = "float" />    <attr name = "toAlpha" format = "float" /></declare-styleable>属性使用：  <alpha    android:fromAlpha = "1.0"    android:toAlpha = "0.7"    />

6、 integer：整型值

属性定义：<declare-styleable name = "名称">     <attr name = "visible" />     <attr name = "frameDuration" format="integer" />     <attr name = "framesCount" format="integer" />     <attr name = "pivotX" />     <attr name = "pivotY" />     <attr name = "drawable" /></declare-styleable>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

属性定义：<declare-styleable name = "名称">     <attr name = "apiKey" format = "string" /></declare-styleable>属性使用：  <animated-rotate      android:layout_width = "fill_parent"     android:layout_height = "fill_parent"     android:apiKey = "0jOkQ80oD1JL9C6HAja99uGXCRiS2CGjKO_bc_g"  />

8、 fraction：百分数

属性定义：<declare-styleable name = "名称">     <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>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>

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>     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"            />

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