Merge pull request tangqi92#16 from troyliu0105/master

replace unavailable link

Author: tangqi92

README.md

@@ -16,7 +16,7 @@
 
 ## 目录
 
-  * [A](#a) 
+  * [A](#a)
   * [B](#b)
   * [C](#c)
   * [D](#d)
@@ -531,7 +531,7 @@
 ### 自定义控件
 
 1. [Android 自定义View及其在布局文件中的使用示例](http://www.cnblogs.com/crashmaker/p/3521310.html)
-2. [自定义控件进阶:declare-styleable重用attr](http://droidyue.com/blog/2014/07/16/better-in-android-include-attrs-in-declare-stylable/)
+2. [自定义控件进阶:declare-styleable重用attr](https://github.com/troyliu0105/Android-Tips/blob/master/Utils/Content/declare-styleable_reuse_attr.md)
 3. [android 自定义控件 使用declare-styleable进行配置属性（源码角度）](http://blog.csdn.net/vipzjyno1/article/details/23696537)
 4. [Android使用AttributeSet自定义控件的方法](http://www.cnblogs.com/zwl12549/archive/2011/04/13/2015366.html)
 5. [从源码中浅析Android中如何利用attrs和styles定义控件](http://michaelye1988.iteye.com/blog/1773997)
@@ -561,7 +561,7 @@
 
 ## Contributors
 
-- [troyliu0105](https://github.com/troyliu0105) 
+- [troyliu0105](https://github.com/troyliu0105)
 - [whiskeyfei](https://github.com/whiskeyfei)
 - [wavever](https://github.com/wavever)
 - [nitta-honoka](https://github.com/nitta-honoka)
@@ -571,9 +571,8 @@
 
 ## Contact Me
 
-Born in 1992, now a student of Southeast University, master of software engineerin. Loving technology, programming, reading and sports. 
+Born in 1992, now a student of Southeast University, master of software engineerin. Loving technology, programming, reading and sports.
 
 I will graduate in June 2017, expect the internship or full-time job in Android or iOS.
 
 If you have any questions or want to make friends with me, please feel free to contact me : [imtangqi#gmail.com](mailto:[email protected] "Welcome to contact me")  
-

Utils/Content/declare-styleable_reuse_attr.md

@@ -0,0 +1,84 @@
+[原文链接](http://droidyue.com/blog/2014/07/16/better-in-android-include-attrs-in-declare-stylable/)(*需要科学上网*)
+
+## 自定义控件进阶:declare-styleable重用attr
+
+最近接触了Android自定义控件,涉及到自定义xml中得属性(attribute),其实也很简单,但是写着写着,发现代码不完美了,就是在attrs.xml这个文件中,发现属性冗余,于是就想有没有类似属性继承或者include之类的方法.本文将就declare-stylable中属性重用记录一下.
+
+---
+
+### 不完美的代码
+
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <declare-styleable name="ExTextView">
+       <attr name="enableOnPad" format="boolean" />
+     <attr name="supportDeviceType" format="reference"/>
+    </declare-styleable>
+
+    <declare-styleable name="ExEditText">
+       <attr name="enableOnPad" format="boolean" />
+     <attr name="supportDeviceType" format="reference"/>  
+    </declare-styleable>
+</resources>
+```
+
+如上面代码,在ExTextView和ExEditText这个stylable中有着重复的属性申明.虽然上面可以工作,但是总感觉写的不专业,于是寻找优化方法.
+
+---
+
+### 还可以这样么
+
+尝试着为declare-stylable指定一个parent,如下代码
+
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <declare-styleable name="ExTextView">
+       <attr name="enableOnPad" format="boolean" />
+     <attr name="supportDeviceType" format="reference"/>
+    </declare-styleable>
+
+    <declare-styleable name="ExEditText" parent="ExTextView">
+
+    </declare-styleable>
+</resources>
+```
+
+attrs.xml没有报告语法错误.但是当我使用R.styleable.ExEditText_supportDeviceType时候,R文件却没有生成,重新清理了工程还是不生效,不知道是否为adt插件的问题.其他人也遇到了这样的问题. 这个方法目前是不行的.
+
+---
+
+### 终极答案
+
+实际上我们可以在declare-stylable之前,申明要多次使用的属性,在declare-stylable节点内部,只需调用即可.具体代码如下.
+
+```xml
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <attr name="enableOnPad" format="boolean" />
+  <attr name="supportDeviceType" format="reference"/>
+
+    <declare-styleable name="ExTextView">
+        <attr name="enableOnPad"/>
+        <attr name="supportDeviceType"/>
+    </declare-styleable>
+
+    <declare-styleable name="ExEditText">
+        <attr name="enableOnPad"/>
+      <attr name="supportDeviceType"/>
+    </declare-styleable>
+</resources>
+```
+
+每次引用attr后,建议清理一下工程,确保R文件重新生成.
+
+#### 延伸阅读
+
++ [http://stackoverflow.com/questions/18827875/how-to-declare-several-stylable-attributes-with-the-same-name-for-different-tags](http://stackoverflow.com/questions/18827875/how-to-declare-several-stylable-attributes-with-the-same-name-for-different-tags)
+
+#### 其他
+
++ [Android系统源代码情景分析](http://www.amazon.cn/gp/product/B009OLU8EE/ref=as_li_tf_tl?ie=UTF8&camp=536&creative=3200&creativeASIN=B009OLU8EE&linkCode=as2&tag=droidyue-23)