第三方包属性的定义（这里是以刷新库为例）

下面是以pulltorefresh内部的刷新库为例：
1.在xml布局内,使用方法如下：

<com.handmark.pulltorefresh.library.PullToRefreshScrollView        xmlns:ptr="http://schemas.android.com/apk/res-auto"        android:id="@+id/meet_story_main_scroll"        android:layout_width="match_parent"        android:layout_height="match_parent"        android:scrollbars="none"        android:layout_below="@+id/meet_title_bar"        ptr:ptrHeaderBackground="#00ff00"        ptr:ptrHeaderTextColor="@color/meet_gray_color"        ptr:ptrListViewExtrasEnabled="false"        ptr:ptrScrollingWhileRefreshingEnabled="true" />

2.它的文件在values文件夹下的atts.xml内:如下

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="PullToRefresh">        <!-- A drawable to use as the background of the Refreshable View -->        <attr name="ptrRefreshableViewBackground" format="reference|color" />        <!-- A drawable to use as the background of the Header and Footer Loading Views -->        <attr name="ptrHeaderBackground" format="reference|color" />        <!-- Text Color of the Header and Footer Loading Views -->        <attr name="ptrHeaderTextColor" format="reference|color" />        <!-- Text Color of the Header and Footer Loading Views Sub Header -->        <attr name="ptrHeaderSubTextColor" format="reference|color" />        <!-- Mode of Pull-to-Refresh that should be used -->        <attr name="ptrMode">            <flag name="disabled" value="0x0" />            <flag name="pullFromStart" value="0x1" />            <flag name="pullFromEnd" value="0x2" />            <flag name="both" value="0x3" />            <flag name="manualOnly" value="0x4" />            <!-- These last two are depreacted -->            <flag name="pullDownFromTop" value="0x1" />            <flag name="pullUpFromBottom" value="0x2" />        </attr>        <!-- Whether the Indicator overlay(s) should be used -->        <attr name="ptrShowIndicator" format="reference|boolean" />        <!-- Drawable to use as Loading Indicator. Changes both Header and Footer. -->        <attr name="ptrDrawable" format="reference" />        <!-- Drawable to use as Loading Indicator in the Header View. Overrides value set in ptrDrawable. -->        <attr name="ptrDrawableStart" format="reference" />        <!-- Drawable to use as Loading Indicator in the Footer View. Overrides value set in ptrDrawable. -->        <attr name="ptrDrawableEnd" format="reference" />        <!-- Whether Android's built-in Over Scroll should be utilised for Pull-to-Refresh. -->        <attr name="ptrOverScroll" format="reference|boolean" />        <!-- Base text color, typeface, size, and style for Header and Footer Loading Views -->        <attr name="ptrHeaderTextAppearance" format="reference" />        <!-- Base text color, typeface, size, and style for Header and Footer Loading Views Sub Header -->        <attr name="ptrSubHeaderTextAppearance" format="reference" />        <!-- Style of Animation should be used displayed when pulling. -->        <attr name="ptrAnimationStyle">            <flag name="rotate" value="0x0" />            <flag name="flip" value="0x1" />        </attr>        <!-- Whether the user can scroll while the View is Refreshing -->        <attr name="ptrScrollingWhileRefreshingEnabled" format="reference|boolean" />        <!--            Whether PullToRefreshListView has it's extras enabled. This allows the user to be             able to scroll while refreshing, and behaves better. It acheives this by adding            Header and/or Footer Views to the ListView.        -->        <attr name="ptrListViewExtrasEnabled" format="reference|boolean" />        <!--            Whether the Drawable should be continually rotated as you pull. This only            takes effect when using the 'Rotate' Animation Style.        -->        <attr name="ptrRotateDrawableWhilePulling" format="reference|boolean" />        <!-- BELOW HERE ARE DEPRECEATED. DO NOT USE. -->        <attr name="ptrAdapterViewBackground" format="reference|color" />        <attr name="ptrDrawableTop" format="reference" />        <attr name="ptrDrawableBottom" format="reference" />    </declare-styleable></resources>

在代码中也是可以写的，如下：

if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance)) {            TypedValue styleID = new TypedValue();            attrs.getValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance, styleID);            setTextAppearance(styleID.data);        }

现在很多都是使用这种属性，了解一下操作起来很是方便。