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[转]Android Shape渲染的使用（经典，学习研究不后悔）

原创作品，允许转载，转载时请务必以超链接形式标明文章原始出处、作者信息和本声明。否则将追究法律责任。http://mzh3344258.blog.51cto.com/1823534/1215749

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）：

<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)

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)

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)

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)

<?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

<?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

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

本文出自 “酷_莫名简单、KNothing” 博客，请务必保留此出处http://mzh3344258.blog.51cto.com/1823534/1215749

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原文地址：https://www.cnblogs.com/xunbu7/p/4999038.html