感觉好久都没有写博文了，感觉自己变懒了，真对不起…-_-…   也有部分原因是因为我想写的东

西网上已经有了，再加上还有很多方面小马我也正在学习，所以….这段时间一直暂停更新我的博客文

章，看到博客的访问量一天天的增加，很开心 。。。O_O。。。这一阵子也看了各种各样的书籍，技

术类的、非技术类的，也找到了自身很多的不足之处，我会用更多的心思来弥补不足，希望大家一起

努力、加油！


       以上是对自己讲的一点废话，现在开始今天的主题，控件渲染Shade（也可以叫着色器，但坏小

马不喜欢这么叫，着色器….怪怪的！）的使用，一直都有在关注这方面的东西，网上也有部分文章写

得不错，但是还是觉得不过瘾，往往都是写一点点自己在工作中使用过的，今天小马就用点心总结下

这方面的东西，希望对这块知识有兴趣的帅果、美驴们有所帮助或提高，果断先看效果再一步步看代

码！希望大家仔细看看我在XML及.java中添加的注释，相信你不会后悔花时间在这文章上的，今天的

DEMO效果图如下：


131346192.gif


好了，效果看完了，下一步开始看代码吧，亲…….静下心….一步步来！！！


PS:模拟器与eclipse效果中预览的以下部分有点不一样，可能是eclipse与模拟器二者之前存在Bug吧…吼吼….



工程目录如下:


133457906.png



首先，先做个小小的铺垫：


Android提供的Shader类主要是渲染图像以及一些几何图形。


Shader有几个直接子类：


BitmapShader    : 主要用来渲染图像


LinearGradient  :用来进行线性渲染


RadialGradient  : 用来进行环形渲染


SweepGradient   : 扫描渐变---围绕一个中心点扫描渐变就像电影里那种雷达扫描，用来梯度渲染。


ComposeShader   : 组合渲染，可以和其他几个子类组合起来使用。




小记：Android控件渲染Shade的实现方式有两种，（一、JAVA代码实现；二、XML配置来实现），

        小马自己比较偏向XML实现，原因很简单:


1.你代码实现写得再经典，不跑起来效果看不到！


2.跑一遍Android模拟器，思路可以断一大节！（我很笨，经常这样 T_T）！


3.JAVA代码的每个函数参数你也得一个个去啃（老板管效率，不管怎么实现，等你啃完参数时，XML已经看到效果了 O_o  ……走起…..）！


4，这是最主要的一点，Eclipse或者I/O大会刚推出的Android Studio，实时显示，我就特别                  喜欢立竿见影 ^_^ ！


5.二者各有利弊，JAVA代码实现可以动态且灵活滴，XML配置的统一但不杂乱 @_@！！




Now……..   Ladies and 乡亲们，看举一种JAVA代码excmple，其余类型的与之类似，亲们自己“度娘 、谷哥 ”：


LinearGradient是线性渐变，用法如下：

Gradient是基于Shader类，所以我们通过Paint的setShader方法来设置这个渐变，代码如下:

Paint p=new Paint();
LinearGradient lg=newLinearGradien(0,0,100,100,Color.RED,Color.BLUE,Shader.TileMode.MIRROR);

Gradient是基于Shader类，所以我们通过Paint的setShader方法来设置这个渐变，代码如下:

p.setShader(lg);
canvas.drawCicle(0,0,200,p); //参数3为画圆的半径，类型为float型。


先不说效果了，PS：看着上面的代码，有没有想哭的冲动啊 ? ? ?感觉乱乱的，不知道是什么，然后单词gradient不懂，一查如下（晕）,看着挺牛，还是只是个渲染！不管了，继续往下看…


125227956.png


再看XML配置代码,如下:


一：主布局文件代码如下（为了方便，布局是直接拖的，大家不用太关注）：

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< RelativeLayout  xmlns:android = "http://schemas.android.com/apk/res/android"
     xmlns:tools = "http://schemas.android.com/tools"
     android:layout_width = "match_parent"
     android:layout_height = "match_parent"
     android:background = "@drawable/background"
     android:paddingBottom = "@dimen/activity_vertical_margin"
     android:paddingLeft = "@dimen/activity_horizontal_margin"
     android:paddingRight = "@dimen/activity_horizontal_margin"
     android:paddingTop = "@dimen/activity_vertical_margin"
     tools:context = ".MainActivity"  >
     < com.xiaoma.shadedemo.TextViewBorder
         android:id = "@+id/textView1"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:layout_alignParentLeft = "true"
         android:layout_alignParentTop = "true"
         android:layout_marginLeft = "22dp"
         android:layout_marginTop = "20dp"
         android:text = " JAVA实现带四条边框"
         android:textColor = "@android:color/white"
         android:textSize = "25sp"  />
     < com.xiaoma.shadedemo.TextViewBorderLeftRight
         android:id = "@+id/TextViewBorder01"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:textColor = "@android:color/white"
         android:layout_alignLeft = "@+id/textView1"
         android:layout_below = "@+id/textView1"
         android:layout_marginTop = "20dp"
         android:text = "JAVA实现带左右边框"
         android:textSize = "25sp"  />
     < com.xiaoma.shadedemo.TextViewBorderUnder
         android:id = "@+id/TextViewBorder02"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:layout_alignLeft = "@+id/TextViewBorder01"
         android:textColor = "@android:color/white"
         android:layout_below = "@+id/TextViewBorder01"
         android:layout_marginTop = "33dp"
         android:text = "JAVA代码实现下边框"
         android:textSize = "25sp"  />
     < TextView
         android:id = "@+id/TextViewBorderUnder01"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:layout_alignLeft = "@+id/button1"
         android:layout_below = "@+id/TextViewBorder02"
         android:layout_marginTop = "20dp"
         android:text = "Shape XML实现边框"
         android:background = "@drawable/shape_test"
         android:textColor = "@android:color/white"
         android:textSize = "25sp"  />
     < Button
         android:id = "@+id/button1"
         android:layout_width = "wrap_content"
         android:layout_height = "wrap_content"
         android:layout_alignLeft = "@+id/TextViewBorder02"
         android:layout_below = "@+id/TextViewBorderUnder01"
         android:layout_marginTop = "29dp"
         android:background = "@drawable/shape_selector"
         android:text = "Selector与Shape混用按钮"
         android:textColor = "@android:color/black"  />
</ RelativeLayout >



二：上面布局中使用的自定义控件代码及Shape渲染代码分别如下：


   2.1：JAVA实现带四条边框(自定义TextView JAVA代码一)

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package  com.xiaoma.shadedemo;
import  android.content.Context;
import  android.graphics.Canvas;
import  android.graphics.Color;
import  android.graphics.Paint;
import  android.util.AttributeSet;
import  android.widget.TextView;
public  class  TextViewBorder  extends  TextView
{
                                                                                                                                                                  
     /**
      * 下面两个方法在构造时需注意: 一:如果是XML文件加载的方式使用自定义控件到布局中是用以下方式, 二:如果是用纯代码的方式加载自定义的控制到而已中时用第二种方式
      */
                                                                                                                                                                  
     // 方式一：
     public  TextViewBorder(Context context, AttributeSet attrs)
     {
         super (context, attrs);
     }
                                                                                                                                                                  
     // 方式二：
     /*
      * public TextViewBorder(Context context) { // TODO Auto-generated constructor stub super(context); }
      */
                                                                                                                                                                  
     /**
      * 1. Rect对象 一个区域对象Rect(left, top, right, bottom) ， 是一个左闭右开的区域， 即是说使用 Rect.contains(left, top)为true，
      * Rect.contains(right, bottom)为false 2. drawLine方法 drawLine(float startX, float startY, float stopX, float stopY,
      * Paint paint) 也是一个左闭右开的区间，只会绘制到stopX-1,stopY-1 3. drawRect(Rect r, Paint paint) 当绘制空心矩形时，绘制的是一个左闭右闭的区域
      * 验证方法：下面就是可以验证左闭右开的区间方法，现在知道为什么要-1 了
      */
                                                                                                                                                                  
     @Override
     protected void onDraw(Canvas canvas)
     {
         super.onDraw(canvas);
                                                                                                                                                                      
         Paint paint = new Paint();
                                                                                                                                                                      
         paint.setAntiAlias(true);
                                                                                                                                                                      
         paint.setColor(Color.GREEN);
                                                                                                                                                                      
         canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint);// 绘制上边框
                                                                                                                                                                      
         canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint); // 绘制左边框
                                                                                                                                                                      
         canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint); // 绘制右边框
                                                                                                                                                                      
         canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, this.getHeight() - 1, paint);// 绘制下边框
                                                                                                                                                                      
     }
                                                                                                                                                                  
     /*
      * 1. Rect对象
      *
      * 一个区域对象Rect(left, top, right, bottom) ， 是一个左闭右开的区域，即是说使用 Rect.contains(left, top)为true， Rect.contains(right,
      * bottom)为false
      *
      * 2.drawLine方法
      *
      * drawLine(float startX, float startY, float stopX, float stopY, Paint paint) 也是一个左闭右开的区间，只会绘制到stopX-1,stopY-1
      *
      * 验证方法：
      *
      * Canvas c = canvas; paint.setColor(Color.RED); c.drawLine(x, y, x+c.getWidth()-1, y, paint); c.drawLine(x,
      * y+height-1, x+c.getWidth(), y+height-1, paint); paint.setColor(Color.BLUE); c.drawPoint(x+c.getWidth()-1, y,
      * paint); 说明drawLine是没有绘制到右边最后一个点的
      *
      * 3.drawRect(Rect r, Paint paint)
      *
      * 当绘制空心矩形时，绘制的是一个左闭右闭的区域
      *
      * 验证方法：
      *
      * rect.set(x, y, x+width, y+height); paint.setStyle(Style.STROKE); paint.setColor(Color.BLUE); c.drawRect(rect,
      * paint); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x, y+height, x+width,
      * y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width, y+height, paint);
      * 当绘制实心矩形时，绘制的是一个左闭右开的区域
      *
      * 验证方法：
      *
      * rect.set(x, y, x+width, y+height); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x,
      * y+height, x+width, y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width,
      * y+height, paint); paint.setStyle(Style.FILL); paint.setColor(Color.BLUE); c.drawRect(rect, paint);
      * 这个规则跟j2me也是一样的，在j2me里，drawRect长宽会多画出1px。SDK的说明是：
      *
      * The resulting rectangle will cover an area (width + 1) pixels wide by (height + 1) pixels tall. If either width
      * or height is less than zero, nothing is drawn.
      *
      * 例如drawRect(10,10,100,1)绘制，结果是一个2px高的矩形,用fillRect(10,10,100,1)，结果是一个1px高的矩形
      *
      * 以上就是对Android绘图的具体介绍。
      */
                                                                                                                                                                  
}
/**
  * 在布局文件中引用 这样引用就行了..吼吼 <com.xiaoma.shadedemo.TextViewBorder android:id="@+id/a02_txtKSSJ" android:textColor="#000000"
  * android:layout_marginLeft="10dip" android:layout_width="100dip" android:layout_height="wrap_content" />
  */



   2.2：JAVA实现带左右边框(自定义TextView JAVA代码二)


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package  com.xiaoma.shadedemo;
import  android.content.Context;
import  android.graphics.Canvas;
import  android.graphics.Color;
import  android.graphics.Paint;
import  android.util.AttributeSet;
import  android.widget.TextView;
public  class  TextViewBorderLeftRight  extends  TextView
{
                                                                                                                                                              
     /**
      * 下面两个方法在构造时需注意: 一:如果是XML文件加载的方式使用自定义控件到布局中是用以下方式, 二:如果是用纯代码的方式加载自定义的控制到而已中时用第二种方式
      */
                                                                                                                                                              
     // 方式一：
     public  TextViewBorderLeftRight(Context context, AttributeSet attrs)
     {
         super (context, attrs);
     }
                                                                                                                                                              
     // 方式二：
     /*
      * public TextViewBorder(Context context) { // TODO Auto-generated constructor stub super(context); }
      */
                                                                                                                                                              
     /**
      * 1. Rect对象 一个区域对象Rect(left, top, right, bottom) ， 是一个左闭右开的区域， 即是说使用 Rect.contains(left, top)为true，
      * Rect.contains(right, bottom)为false 2. drawLine方法 drawLine(float startX, float startY, float stopX, float stopY,
      * Paint paint) 也是一个左闭右开的区间，只会绘制到stopX-1,stopY-1 3. drawRect(Rect r, Paint paint) 当绘制空心矩形时，绘制的是一个左闭右闭的区域
      * 验证方法：下面就是可以验证左闭右开的区间方法，现在知道为什么要-1 了
      */
                                                                                                                                                              
     @Override
     protected void onDraw(Canvas canvas)
     {
         super.onDraw(canvas);
                                                                                                                                                                  
         Paint paint = new Paint();
                                                                                                                                                                  
         paint.setAntiAlias(true);
                                                                                                                                                                  
         paint.setColor(Color.GREEN);
                                                                                                                                                                  
         canvas.drawLine(0, 0, 0, getHeight(), paint);
                                                                                                                                                                  
         // canvas.drawLine(getWidth(), 0, getWidth() - 1, getHeight() - 1, paint);
         canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint);
                                                                                                                                                                  
         // canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint);
                                                                                                                                                                  
         // canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint);
                                                                                                                                                                  
         // canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, this.getHeight() - 1, paint);
                                                                                                                                                                  
     }
     /*
      * 1. Rect对象
      *
      * 一个区域对象Rect(left, top, right, bottom) ， 是一个左闭右开的区域，即是说使用 Rect.contains(left, top)为true， Rect.contains(right,
      * bottom)为false
      *
      * 2.drawLine方法
      *
      * drawLine(float startX, float startY, float stopX, float stopY, Paint paint) 也是一个左闭右开的区间，只会绘制到stopX-1,stopY-1
      *
      * 验证方法：
      *
      * Canvas c = canvas; paint.setColor(Color.RED); c.drawLine(x, y, x+c.getWidth()-1, y, paint); c.drawLine(x,
      * y+height-1, x+c.getWidth(), y+height-1, paint); paint.setColor(Color.BLUE); c.drawPoint(x+c.getWidth()-1, y,
      * paint); 说明drawLine是没有绘制到右边最后一个点的
      *
      * 3.drawRect(Rect r, Paint paint)
      *
      * 当绘制空心矩形时，绘制的是一个左闭右闭的区域
      *
      * 验证方法：
      *
      * rect.set(x, y, x+width, y+height); paint.setStyle(Style.STROKE); paint.setColor(Color.BLUE); c.drawRect(rect,
      * paint); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x, y+height, x+width,
      * y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width, y+height, paint);
      * 当绘制实心矩形时，绘制的是一个左闭右开的区域
      *
      * 验证方法：
      *
      * rect.set(x, y, x+width, y+height); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x,
      * y+height, x+width, y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width,
      * y+height, paint); paint.setStyle(Style.FILL); paint.setColor(Color.BLUE); c.drawRect(rect, paint);
      * 这个规则跟j2me也是一样的，在j2me里，drawRect长宽会多画出1px。SDK的说明是：
      *
      * The resulting rectangle will cover an area (width + 1) pixels wide by (height + 1) pixels tall. If either width
      * or height is less than zero, nothing is drawn.
      *
      * 例如drawRect(10,10,100,1)绘制，结果是一个2px高的矩形,用fillRect(10,10,100,1)，结果是一个1px高的矩形
      *
      * 以上就是对Android绘图的具体介绍。
      */
                                                                                                                                                              
}
/**
  * 在布局文件中引用 这样引用就行了..吼吼 <com.xiaoma.shadedemo.TextViewBorder android:id="@+id/a02_txtKSSJ" android:textColor="#000000"
  * android:layout_marginLeft="10dip" android:layout_width="100dip" android:layout_height="wrap_content" />
  */


   2.3：JAVA代码实现下边框(自定义TextView JAVA代码三)


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package  com.xiaoma.shadedemo;
import  android.content.Context;
import  android.graphics.Canvas;
import  android.graphics.Color;
import  android.graphics.Paint;
import  android.util.AttributeSet;
import  android.widget.TextView;
public  class  TextViewBorderUnder  extends  TextView
{
                                                                                                                                                            
     /**
      * 下面两个方法在构造时需注意: 一:如果是XML文件加载的方式使用自定义控件到布局中是用以下方式, 二:如果是用纯代码的方式加载自定义的控制到而已中时用第二种方式
      */
                                                                                                                                                            
     // 方式一：
     public  TextViewBorderUnder(Context context, AttributeSet attrs)
     {
         super (context, attrs);
     }
                                                                                                                                                            
     // 方式二：
     /*
      * public TextViewBorder(Context context) { // TODO Auto-generated constructor stub super(context); }
      */
                                                                                                                                                            
     /**
      * 1. Rect对象 一个区域对象Rect(left, top, right, bottom) ， 是一个左闭右开的区域， 即是说使用 Rect.contains(left, top)为true，
      * Rect.contains(right, bottom)为false 2. drawLine方法 drawLine(float startX, float startY, float stopX, float stopY,
      * Paint paint) 也是一个左闭右开的区间，只会绘制到stopX-1,stopY-1 3. drawRect(Rect r, Paint paint) 当绘制空心矩形时，绘制的是一个左闭右闭的区域
      * 验证方法：下面就是可以验证左闭右开的区间方法，现在知道为什么要-1 了
      */
                                                                                                                                                            
     @Override
     protected void onDraw(Canvas canvas)
     {
         super.onDraw(canvas);
                                                                                                                                                                
         Paint paint = new Paint();
                                                                                                                                                                
         paint.setAntiAlias(true);
                                                                                                                                                                
         paint.setColor(Color.GREEN);
                                                                                                                                                                
         // canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint);
                                                                                                                                                                
         // canvas.drawLine(0, getHeight(), getWidth() - 1, getHeight(), paint);
                                                                                                                                                                
         // canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint);
                                                                                                                                                                
         canvas.drawLine(0, getHeight() - 1, getWidth() - 1, getHeight() - 1, paint);
                                                                                                                                                                
     }
                                                                                                                                                            
     /*
      * 1. Rect对象
      *
      * 一个区域对象Rect(left, top, right, bottom) ， 是一个左闭右开的区域，即是说使用 Rect.contains(left, top)为true， Rect.contains(right,
      * bottom)为false
      *
      * 2.drawLine方法
      *
      * drawLine(float startX, float startY, float stopX, float stopY, Paint paint) 也是一个左闭右开的区间，只会绘制到stopX-1,stopY-1
      *
      * 验证方法：
      *
      * Canvas c = canvas; paint.setColor(Color.RED); c.drawLine(x, y, x+c.getWidth()-1, y, paint); c.drawLine(x,
      * y+height-1, x+c.getWidth(), y+height-1, paint); paint.setColor(Color.BLUE); c.drawPoint(x+c.getWidth()-1, y,
      * paint); 说明drawLine是没有绘制到右边最后一个点的
      *
      * 3.drawRect(Rect r, Paint paint)
      *
      * 当绘制空心矩形时，绘制的是一个左闭右闭的区域
      *
      * 验证方法：
      *
      * rect.set(x, y, x+width, y+height); paint.setStyle(Style.STROKE); paint.setColor(Color.BLUE); c.drawRect(rect,
      * paint); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x, y+height, x+width,
      * y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width, y+height, paint);
      * 当绘制实心矩形时，绘制的是一个左闭右开的区域
      *
      * 验证方法：
      *
      * rect.set(x, y, x+width, y+height); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x,
      * y+height, x+width, y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width,
      * y+height, paint); paint.setStyle(Style.FILL); paint.setColor(Color.BLUE); c.drawRect(rect, paint);
      * 这个规则跟j2me也是一样的，在j2me里，drawRect长宽会多画出1px。SDK的说明是：
      *
      * The resulting rectangle will cover an area (width + 1) pixels wide by (height + 1) pixels tall. If either width
      * or height is less than zero, nothing is drawn.
      *
      * 例如drawRect(10,10,100,1)绘制，结果是一个2px高的矩形,用fillRect(10,10,100,1)，结果是一个1px高的矩形
      *
      * 以上就是对Android绘图的具体介绍。
      */
                                                                                                                                                            
}
/**
  * 在布局文件中引用 这样引用就行了..吼吼 <com.xiaoma.shadedemo.TextViewBorder android:id="@+id/a02_txtKSSJ" android:textColor="#000000"
  * android:layout_marginLeft="10dip" android:layout_width="100dip" android:layout_height="wrap_content" />
  */

   2.4：Shape XML实现边框(XML代码)


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<? xml  version = "1.0"  encoding = "utf-8" ?>
< shape  xmlns:android = "http://schemas.android.com/apk/res/android"  >
     <!-- <solid  android:color="#cceeff"/>   直接写这个的话，可以给控制添加一个整体的背景哦 -->
     < stroke
         android:width = "0.5dp"
         android:color = "#22ccff"  />
     < padding   android:left = "5dp"  android:top = "5dp"  android:right = "5dp"  android:bottom = "5dp" />
                                                                                                                                                      
     < size
         android:height = "0.5dp"
         android:width = "5dp"  />
  <!-- 目前没有什么用，可删除，留在这个地方防止乱猜 -->
                                                                                                                                                   
     < corners  android:radius = "10dp"  />
  <!-- 这个radius里面的值需要个整型，单位用dp，用其它单位亦无影响 -->
                                                                                                                                                   
</ shape >


   2.5：Selector与Shape混用控件效果实现


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<? xml  version = "1.0"  encoding = "utf-8" ?>
< selector  xmlns:android = "http://schemas.android.com/apk/res/android" >
                                                                                                                                                  
     <!-- 今天主要讲的是shape渲染，shape主要类型分四种，效果如下，我们常用rectangle，也就是矩形渲染，其它的都太丑了！！ -->
                                                                                                                                                  
                                                                                                                                                  
     < item  android:state_pressed = "true" >  <!--按钮按下时的渲染效果 -->
             < shape  android:shape = "oval" >
                                                                                                                                                          
                 < corners  android:radius = "10dp"  />  <!-- 四个角的角度 -->
                                                                                                                                                  
                 <!--gradient就是梯度渲染，简单说就是颜色渐变，type为渐变方式，总共三种 linear sweep  ridial,常用linear-->
                 < gradient  android:endColor = "#eebbbb"  android:startColor = "#9900ee"  android:type = "linear"  />
                                                                                                                                                  
                 <!-- padding属性是指定内容与控件边距，这个地方小马专门将距左边距设置较大，方便观察 -->
                 < padding  android:bottom = "5dp"  android:left = "20dp"  android:right = "5dp"  android:top = "5dp"  />
                                                                                                                                                   
                 <!-- solid填充整个区域，颜色为FFDDFF，如果使用整个区域填充的话，上面的gradient梯度会失效，即：覆盖 -->
                 <!-- <solid  android:color="#FFDDFF"/> -->
                                                                                                                                                              
                 <!-- stroke为需要填充的边框，指定颜色及边框宽度  -->
                 < stroke  android:width = "3dp"  android:color = "#000000"  />
             </ shape >
                                                                                                                                                          
         <!-- <clip android:clipOrientation="vertical" android:gravity="right" android:drawable="@drawable/ic_launcher" /> --> <!-- 试了下没用 -->
         <!-- <color android:color="#223344"/> -->
         <!-- <scale android:scaleWidth="15dp" android:scaleHeight=" 5dp" android:scaleGravity="center" /> -->
                                                                                                                                                      
      </ item >
                                                                                                                                                  
     < item >  <!-- 默认 -->
             < shape  android:shape = "rectangle" >
                                                                                                                                                          
                 < corners  android:radius = "10dp"  />  <!-- 四个角的角度 -->
                                                                                                                                                  
                 <!--gradient就是梯度渲染，简单说就是颜色渐变，type为渐变方式，总共三种 linear sweep  ridial,常用linear-->
                 <!-- 这个地方一定注意，在使用gradient标签中使用android:type的前提是必须android:gradientRadius="20dp"已经设置，否则会报错 -->
                 < gradient  android:endColor = "#acefda"  android:startColor = "#0099ff"  android:type = "linear"  />
                                                                                                                                                  
                 <!-- padding属性是指定内容与控件边距，这个地方小马专门将距左边距设置较大，方便观察 -->
                 < padding  android:bottom = "5dp"  android:left = "20dp"  android:right = "5dp"  android:top = "5dp"  />
                                                                                                                                                   
                 <!-- solid填充整个区域，颜色为FFDDFF，如果使用整个区域填充的话，上面的gradient梯度会失效，即：覆盖 -->
                 <!-- <solid  android:color="#FFDDFF"/> -->
                                                                                                                                                              
                 <!-- stroke为需要填充的边框，指定颜色及边框宽度  -->
                 < stroke  android:width = "3dp"  android:color = "#000000"  />
             </ shape >
      </ item >
                                                                                                                                                   
                                                                                                                                                  
</ selector >


怎么样？看着JAVA自定义TextView代码是不是觉得特别的繁琐？今天的主题就是来解决这个问题的....…^_^.........下面着重来讲一下Selector与Shape混用控件效果Selector实现的细节，（请仔细看下XML里面的注释 O_O）


每个Item过是由Shape来进行渲染生成最终的效果，首先来看根Shape节点的常用属性<shape android:shape="rectangle">：

这个shape属性总共分三种 rectangle(矩形)、oval(椭圆) 、line(删除线)、ring(铃，这个存在不知道有什么意义),其效果分别如下：

1.rectangle
125809565.png


2.oval
125834174.png


3.line

125848178.png

4.ring

125902784.png



其中，gradient标签中的type为渐变方式，总共三种 linear sweep  ridial,常用linear,其效果分别为（注意：ridial试了无任何效果 T_T）


1.linear效果
125927997.png



2.sweep效果
125943212.png


      好了，代码及整体效果已经分解完毕了，如果认真从头到尾的看一边的话，肯定有所收获的，对了，以上的Shape渲染写好了，可以在任意控件上使用…不限于TextView，上面的例子只是拿TextView来开刀用的…大家别误会，呵呵….^_^…. ，最后，小马希望在文章中有什么不清楚或不明白或有错误的地方，请大家直接指出…有错必改的….这个源码小马已经上传到附件中，有兴趣或有用的朋友可以直接下载来跑跑改改看，有批评才有进步，希望有什么不好的，直接指出….在此先谢谢大家啦….


官网参考链接如下（只是没效果图，所以大家也懒得去看这个东西）

http://developer.android.com/guide/topics/resources/drawable-resource.html



这段时间也有在关注各种各样的东西，老听人说学这学那的人越来越多什么的，也希望大家不要随便听人家讲，我敢说….安卓虽然在很多人眼里看来简单、烂，但我觉得如果要深入的话，水还是很深的，如果用心，一定可以做的越来越好的，一步一步来，大家一起努力！做安卓的人越来越多，越有竞争！越有动力！！！这样才会进步！哈哈….加油加油加油！ O_O