Android自定义控件之自定义属性format详解-创新互联

Android 自定义View 控件己经不是什么新鲜话题，Android Api提供了一大堆基础组件给我们，需要什么特定功能还需要我们继承它们然后定制更加丰富的功能。这里介绍一下自定义属性format

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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">
                         <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>

     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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