Android自定义控件中的自定义attrs

android中经常需要用到自定义控件，有时候还需要自己定义attrs，我贴出一点自己的理解。

首先，写一个declare-styleable(如果没有attrs文件，就自己建一个;这里用的是Android v7包中自带的CardView的attrs)：

<span style="font-size:18px;"><resources>    <declare-styleable name="CardView">        <!-- Background color for CardView. -->        <attr name="cardBackgroundColor" format="color" />        <!-- Corner radius for CardView. -->        <attr name="cardCornerRadius" format="dimension" />        <!-- Elevation for CardView. -->        <attr name="cardElevation" format="dimension" />        <!-- Maximum Elevation for CardView. -->        <attr name="cardMaxElevation" format="dimension" />        <!-- Add padding in API v21+ as well to have the same measurements with previous versions. -->        <attr name="cardUseCompatPadding" format="boolean" />        <!-- Add padding to CardView on v20 and before to prevent intersections between the Card content and rounded corners. -->        <attr name="cardPreventCornerOverlap" format="boolean" />        <!-- Inner padding between the edges of the Card and children of the CardView. -->        <attr name="contentPadding" format="dimension" />        <!-- Inner padding between the left edge of the Card and children of the CardView. -->        <attr name="contentPaddingLeft" format="dimension" />        <!-- Inner padding between the right edge of the Card and children of the CardView. -->        <attr name="contentPaddingRight" format="dimension" />        <!-- Inner padding between the top edge of the Card and children of the CardView. -->        <attr name="contentPaddingTop" format="dimension" />        <!-- Inner padding between the bottom edge of the Card and children of the CardView. -->        <attr name="contentPaddingBottom" format="dimension" />    </declare-styleable></resources></span>

其次，在xml中加入，如：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    xmlns:db="http://schemas.android.com/apk/res/com.attrs.demo"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical" >    <android.support.v7.widget.CardView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        <span style="color:#ffff00;">db:cardCornerRadius="8dp"</span> >        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:text="kdddddddddddsl" />    </android.support.v7.widget.CardView></LinearLayout>

其中红色部分( xmlns:db那行)就是在给自己的attrs注册，紫色的db是name，可以自己随便写，后面绿色的(com.attrs.demo)是包名，自己的程序包名。

最后使用时就按黄色部分写出就行。

注：发上去后才发现颜色标注真让人蛋疼,又人工标注了。

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