Android基础--Shape渲染的使用



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：

 

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:

 

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…

 

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）：

view source print ?

01. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

02.     xmlns:tools="http://schemas.android.com/tools"

03.     android:layout_width="match_parent"

04.     android:layout_height="match_parent"

05.     android:background="@drawable/background"

06.     android:paddingBottom="@dimen/activity_vertical_margin"

07.     android:paddingLeft="@dimen/activity_horizontal_margin"

08.     android:paddingRight="@dimen/activity_horizontal_margin"

09.     android:paddingTop="@dimen/activity_vertical_margin"

10.     tools:context=".MainActivity" >

11.     <com.xiaoma.shadedemo.TextViewBorder

12.         android:id="@+id/textView1"

13.         android:layout_width="wrap_content"

14.         android:layout_height="wrap_content"

15.         android:layout_alignParentLeft="true"

16.         android:layout_alignParentTop="true"

17.         android:layout_marginLeft="22dp"

18.         android:layout_marginTop="20dp"

19.         android:text=" JAVA实现带四条边框"

20.         android:textColor="@android:color/white"

21.         android:textSize="25sp" />

22.     <com.xiaoma.shadedemo.TextViewBorderLeftRight

23.         android:id="@+id/TextViewBorder01"

24.         android:layout_width="wrap_content"

25.         android:layout_height="wrap_content"

26.         android:textColor="@android:color/white"

27.         android:layout_alignLeft="@+id/textView1"

28.         android:layout_below="@+id/textView1"

29.         android:layout_marginTop="20dp"

30.         android:text="JAVA实现带左右边框"

31.         android:textSize="25sp" />

32.     <com.xiaoma.shadedemo.TextViewBorderUnder

33.         android:id="@+id/TextViewBorder02"

34.         android:layout_width="wrap_content"

35.         android:layout_height="wrap_content"

36.         android:layout_alignLeft="@+id/TextViewBorder01"

37.         android:textColor="@android:color/white"

38.         android:layout_below="@+id/TextViewBorder01"

39.         android:layout_marginTop="33dp"

40.         android:text="JAVA代码实现下边框"

41.         android:textSize="25sp" />

42.     <TextView

43.         android:id="@+id/TextViewBorderUnder01"

44.         android:layout_width="wrap_content"

45.         android:layout_height="wrap_content"

46.         android:layout_alignLeft="@+id/button1"

47.         android:layout_below="@+id/TextViewBorder02"

48.         android:layout_marginTop="20dp"

49.         android:text="Shape XML实现边框"

50.         android:background="@drawable/shape_test"

51.         android:textColor="@android:color/white"

52.         android:textSize="25sp" />

53.     <Button

54.         android:id="@+id/button1"

55.         android:layout_width="wrap_content"

56.         android:layout_height="wrap_content"

57.         android:layout_alignLeft="@+id/TextViewBorder02"

58.         android:layout_below="@+id/TextViewBorderUnder01"

59.         android:layout_marginTop="29dp"

60.         android:background="@drawable/shape_selector"

61.         android:text="Selector与Shape混用按钮"

62.         android:textColor="@android:color/black" />

63. </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)

view source print ?

001. package com.xiaoma.shadedemo;

002. import android.content.Context;

003. import android.graphics.Canvas;

004. import android.graphics.Color;

005. import android.graphics.Paint;

006. import android.util.AttributeSet;

007. import android.widget.TextView;

008. public class TextViewBorder extends TextView

009. {

010.                                                                                                                                                                    

011.     /**

012.      * 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

013.      */

014.                                                                                                                                                                    

015.     // 方式一：

016.     public TextViewBorder(Context context, AttributeSet attrs)

017.     {

018.         super(context, attrs);

019.     }

020.                                                                                                                                                                    

021.     // 方式二：

022.     /*

023.      * public TextViewBorder(Context context) { // TODO Auto-generated constructor stub super(context); }

024.      */

025.                                                                                                                                                                    

026.     /**

027.      * 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，

028.      * Rect.contains(right, bottom)为false 2. drawLine方法 drawLine(float startX, float startY, float stopX, float stopY,

029.      * 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

030.      * 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

031.      */

032.                                                                                                                                                                    

033.     @Override

034.     protected void onDraw(Canvas canvas)

035.     {

036.         super.onDraw(canvas);

037.                                                                                                                                                                        

038.         Paint paint = new Paint();

039.                                                                                                                                                                        

040.         paint.setAntiAlias(true);

041.                                                                                                                                                                        

042.         paint.setColor(Color.GREEN);

043.                                                                                                                                                                        

044.         canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint);// 绘制上边框

045.                                                                                                                                                                        

046.         canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint); // 绘制左边框

047.                                                                                                                                                                        

048.         canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint); // 绘制右边框

049.                                                                                                                                                                        

050.         canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, this.getHeight() - 1, paint);// 绘制下边框

051.                                                                                                                                                                        

052.     }

053.                                                                                                                                                                    

054.     /*

055.      * 1. Rect对象

056.      *

057.      * 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,

058.      * bottom)为false

059.      *

060.      * 2.drawLine方法

061.      *

062.      * 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

063.      *

064.      * 验证方法：

065.      *

066.      * Canvas c = canvas; paint.setColor(Color.RED); c.drawLine(x, y, x+c.getWidth()-1, y, paint); c.drawLine(x,

067.      * y+height-1, x+c.getWidth(), y+height-1, paint); paint.setColor(Color.BLUE); c.drawPoint(x+c.getWidth()-1, y,

068.      * paint); 说明drawLine是没有绘制到右边最后一个点的

069.      *

070.      * 3.drawRect(Rect r, Paint paint)

071.      *

072.      * 当绘制空心矩形时，绘制的是一个左闭右闭的区域

073.      *

074.      * 验证方法：

075.      *

076.      * rect.set(x, y, x+width, y+height); paint.setStyle(Style.STROKE); paint.setColor(Color.BLUE); c.drawRect(rect,

077.      * paint); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x, y+height, x+width,

078.      * y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width, y+height, paint);

079.      * 当绘制实心矩形时，绘制的是一个左闭右开的区域

080.      *

081.      * 验证方法：

082.      *

083.      * rect.set(x, y, x+width, y+height); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x,

084.      * y+height, x+width, y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width,

085.      * y+height, paint); paint.setStyle(Style.FILL); paint.setColor(Color.BLUE); c.drawRect(rect, paint);

086.      * 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：

087.      *

088.      * The resulting rectangle will cover an area (width + 1) pixels wide by (height + 1) pixels tall. If either width

089.      * or height is less than zero, nothing is drawn.

090.      *

091.      * 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

092.      *

093.      * 以上就是对Android绘图的具体介绍。

094.      */

095.                                                                                                                                                                    

096. }

097. /**

098.  * 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"

099.  * android:layout_marginLeft="10dip" android:layout_width="100dip" android:layout_height="wrap_content" />

100.  */

2.2：JAVA实现带左右边框(自定义TextView JAVA代码二)

 

 

view source print ?

001. package com.xiaoma.shadedemo;

002. import android.content.Context;

003. import android.graphics.Canvas;

004. import android.graphics.Color;

005. import android.graphics.Paint;

006. import android.util.AttributeSet;

007. import android.widget.TextView;

008. public class TextViewBorderLeftRight extends TextView

009. {

010.                                                                                                                                                                

011.     /**

012.      * 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

013.      */

014.                                                                                                                                                                

015.     // 方式一：

016.     public TextViewBorderLeftRight(Context context, AttributeSet attrs)

017.     {

018.         super(context, attrs);

019.     }

020.                                                                                                                                                                

021.     // 方式二：

022.     /*

023.      * public TextViewBorder(Context context) { // TODO Auto-generated constructor stub super(context); }

024.      */

025.                                                                                                                                                                

026.     /**

027.      * 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，

028.      * Rect.contains(right, bottom)为false 2. drawLine方法 drawLine(float startX, float startY, float stopX, float stopY,

029.      * 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

030.      * 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

031.      */

032.                                                                                                                                                                

033.     @Override

034.     protected void onDraw(Canvas canvas)

035.     {

036.         super.onDraw(canvas);

037.                                                                                                                                                                    

038.         Paint paint = new Paint();

039.                                                                                                                                                                    

040.         paint.setAntiAlias(true);

041.                                                                                                                                                                    

042.         paint.setColor(Color.GREEN);

043.                                                                                                                                                                    

044.         canvas.drawLine(0, 0, 0, getHeight(), paint);

045.                                                                                                                                                                    

046.         // canvas.drawLine(getWidth(), 0, getWidth() - 1, getHeight() - 1, paint);

047.         canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint);

048.                                                                                                                                                                    

049.         // canvas.drawLine(0, 0, 0, this.getHeight() - 1, paint);

050.                                                                                                                                                                    

051.         // canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint);

052.                                                                                                                                                                    

053.         // canvas.drawLine(0, this.getHeight() - 1, this.getWidth() - 1, this.getHeight() - 1, paint);

054.                                                                                                                                                                    

055.     }

056.     /*

057.      * 1. Rect对象

058.      *

059.      * 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,

060.      * bottom)为false

061.      *

062.      * 2.drawLine方法

063.      *

064.      * 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

065.      *

066.      * 验证方法：

067.      *

068.      * Canvas c = canvas; paint.setColor(Color.RED); c.drawLine(x, y, x+c.getWidth()-1, y, paint); c.drawLine(x,

069.      * y+height-1, x+c.getWidth(), y+height-1, paint); paint.setColor(Color.BLUE); c.drawPoint(x+c.getWidth()-1, y,

070.      * paint); 说明drawLine是没有绘制到右边最后一个点的

071.      *

072.      * 3.drawRect(Rect r, Paint paint)

073.      *

074.      * 当绘制空心矩形时，绘制的是一个左闭右闭的区域

075.      *

076.      * 验证方法：

077.      *

078.      * rect.set(x, y, x+width, y+height); paint.setStyle(Style.STROKE); paint.setColor(Color.BLUE); c.drawRect(rect,

079.      * paint); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x, y+height, x+width,

080.      * y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width, y+height, paint);

081.      * 当绘制实心矩形时，绘制的是一个左闭右开的区域

082.      *

083.      * 验证方法：

084.      *

085.      * rect.set(x, y, x+width, y+height); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x,

086.      * y+height, x+width, y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width,

087.      * y+height, paint); paint.setStyle(Style.FILL); paint.setColor(Color.BLUE); c.drawRect(rect, paint);

088.      * 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：

089.      *

090.      * The resulting rectangle will cover an area (width + 1) pixels wide by (height + 1) pixels tall. If either width

091.      * or height is less than zero, nothing is drawn.

092.      *

093.      * 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

094.      *

095.      * 以上就是对Android绘图的具体介绍。

096.      */

097.                                                                                                                                                                

098. }

099. /**

100.  * 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"

101.  * android:layout_marginLeft="10dip" android:layout_width="100dip" android:layout_height="wrap_content" />

102.  */

2.3：JAVA代码实现下边框(自定义TextView JAVA代码三)

 

view source print ?

001. package com.xiaoma.shadedemo;

002. import android.content.Context;

003. import android.graphics.Canvas;

004. import android.graphics.Color;

005. import android.graphics.Paint;

006. import android.util.AttributeSet;

007. import android.widget.TextView;

008. public class TextViewBorderUnder extends TextView

009. {

010.                                                                                                                                                              

011.     /**

012.      * 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

013.      */

014.                                                                                                                                                              

015.     // 方式一：

016.     public TextViewBorderUnder(Context context, AttributeSet attrs)

017.     {

018.         super(context, attrs);

019.     }

020.                                                                                                                                                              

021.     // 方式二：

022.     /*

023.      * public TextViewBorder(Context context) { // TODO Auto-generated constructor stub super(context); }

024.      */

025.                                                                                                                                                              

026.     /**

027.      * 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，

028.      * Rect.contains(right, bottom)为false 2. drawLine方法 drawLine(float startX, float startY, float stopX, float stopY,

029.      * 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

030.      * 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

031.      */

032.                                                                                                                                                              

033.     @Override

034.     protected void onDraw(Canvas canvas)

035.     {

036.         super.onDraw(canvas);

037.                                                                                                                                                                  

038.         Paint paint = new Paint();

039.                                                                                                                                                                  

040.         paint.setAntiAlias(true);

041.                                                                                                                                                                  

042.         paint.setColor(Color.GREEN);

043.                                                                                                                                                                  

044.         // canvas.drawLine(0, 0, this.getWidth() - 1, 0, paint);

045.                                                                                                                                                                  

046.         // canvas.drawLine(0, getHeight(), getWidth() - 1, getHeight(), paint);

047.                                                                                                                                                                  

048.         // canvas.drawLine(this.getWidth() - 1, 0, this.getWidth() - 1, this.getHeight() - 1, paint);

049.                                                                                                                                                                  

050.         canvas.drawLine(0, getHeight() - 1, getWidth() - 1, getHeight() - 1, paint);

051.                                                                                                                                                                  

052.     }

053.                                                                                                                                                              

054.     /*

055.      * 1. Rect对象

056.      *

057.      * 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,

058.      * bottom)为false

059.      *

060.      * 2.drawLine方法

061.      *

062.      * 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

063.      *

064.      * 验证方法：

065.      *

066.      * Canvas c = canvas; paint.setColor(Color.RED); c.drawLine(x, y, x+c.getWidth()-1, y, paint); c.drawLine(x,

067.      * y+height-1, x+c.getWidth(), y+height-1, paint); paint.setColor(Color.BLUE); c.drawPoint(x+c.getWidth()-1, y,

068.      * paint); 说明drawLine是没有绘制到右边最后一个点的

069.      *

070.      * 3.drawRect(Rect r, Paint paint)

071.      *

072.      * 当绘制空心矩形时，绘制的是一个左闭右闭的区域

073.      *

074.      * 验证方法：

075.      *

076.      * rect.set(x, y, x+width, y+height); paint.setStyle(Style.STROKE); paint.setColor(Color.BLUE); c.drawRect(rect,

077.      * paint); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x, y+height, x+width,

078.      * y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width, y+height, paint);

079.      * 当绘制实心矩形时，绘制的是一个左闭右开的区域

080.      *

081.      * 验证方法：

082.      *

083.      * rect.set(x, y, x+width, y+height); paint.setColor(Color.RED); c.drawLine(x, y, x+width, y, paint); c.drawLine(x,

084.      * y+height, x+width, y+height, paint); c.drawLine(x, y, x, y+height, paint); c.drawLine(x+width, y, x+width,

085.      * y+height, paint); paint.setStyle(Style.FILL); paint.setColor(Color.BLUE); c.drawRect(rect, paint);

086.      * 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：

087.      *

088.      * The resulting rectangle will cover an area (width + 1) pixels wide by (height + 1) pixels tall. If either width

089.      * or height is less than zero, nothing is drawn.

090.      *

091.      * 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

092.      *

093.      * 以上就是对Android绘图的具体介绍。

094.      */

095.                                                                                                                                                              

096. }

097. /**

098.  * 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"

099.  * android:layout_marginLeft="10dip" android:layout_width="100dip" android:layout_height="wrap_content" />

100.  */

2.4：Shape XML实现边框(XML代码)

 

view source print ?

01. <?xml version="1.0" encoding="utf-8"?>

02. <shape xmlns:android="http://schemas.android.com/apk/res/android" >

03.     <!-- <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 -->

04.     <stroke

05.         android:width="0.5dp"

06.         android:color="#22ccff" />

07.     <padding  android:left="5dp" android:top="5dp" android:right="5dp" android:bottom="5dp"/>

08.                                                                                                                                                        

09.     <size

10.         android:height="0.5dp"

11.         android:width="5dp" />

12.  <!-- 目前没有什么用，可删除，留在这个地方防止乱猜 -->

13.                                                                                                                                                     

14.     <corners android:radius="10dp" />

15.  <!-- 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 -->

16.                                                                                                                                                     

17. </shape>

 2.5：Selector与Shape混用控件效果实现

 

view source print ?

01. <?xml version="1.0" encoding="utf-8"?>

02. <selector xmlns:android="http://schemas.android.com/apk/res/android">

03.                                                                                                                                                    

04.     <!-- 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！！ -->

05.                                                                                                                                                    

06.                                                                                                                                                    

07.     <item android:state_pressed="true"> <!--按钮按下时的渲染效果 -->

08.             <shape android:shape="oval">

09.                                                                                                                                                            

10.                 <corners android:radius="10dp" /> <!-- 四个角的角度 -->

11.                                                                                                                                                    

12.                 <!--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-->

13.                 <gradient android:endColor="#eebbbb" android:startColor="#9900ee" android:type="linear" />

14.                                                                                                                                                    

15.                 <!-- 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 -->

16.                 <padding android:bottom="5dp" android:left="20dp" android:right="5dp" android:top="5dp" />

17.                                                                                                                                                     

18.                 <!-- 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 -->

19.                 <!-- <solid  android:color="#FFDDFF"/> -->

20.                                                                                                                                                                

21.                 <!-- stroke为需要填充的边框，指定颜色及边框宽度  -->

22.                 <stroke android:width="3dp" android:color="#000000" />

23.             </shape>

24.                                                                                                                                                            

25.         <!-- <clip android:clipOrientation="vertical" android:gravity="right" android:drawable="@drawable/ic_launcher" /> --><!-- 试了下没用 -->

26.         <!-- <color android:color="#223344"/> -->

27.         <!-- <scale android:scaleWidth="15dp" android:scaleHeight=" 5dp" android:scaleGravity="center" /> -->

28.                                                                                                                                                        

29.      </item>

30.                                                                                                                                                    

31.     <item> <!-- 默认 -->

32.             <shape android:shape="rectangle">

33.                                                                                                                                                            

34.                 <corners android:radius="10dp" /> <!-- 四个角的角度 -->

35.                                                                                                                                                    

36.                 <!--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-->

37.                 <!-- 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 -->

38.                 <gradient android:endColor="#acefda" android:startColor="#0099ff" android:type="linear" />

39.                                                                                                                                                    

40.                 <!-- 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 -->

41.                 <padding android:bottom="5dp" android:left="20dp" android:right="5dp" android:top="5dp" />

42.                                                                                                                                                     

43.                 <!-- 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 -->

44.                 <!-- <solid  android:color="#FFDDFF"/> -->

45.                                                                                                                                                                

46.                 <!-- stroke为需要填充的边框，指定颜色及边框宽度  -->

47.                 <stroke android:width="3dp" android:color="#000000" />

48.             </shape>

49.      </item>

50.                                                                                                                                                     

51.                                                                                                                                                    

52. </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

 

2.oval

 

3.line
 

4.ring

 

 

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

 

 

2.sweep效果



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