Android-[转载]shape与selector实现圆角

shape和selector是Android UI设计中经常用到的，比如我们要自定义一个圆角Button，点击Button有些效果的变化，就要用到shape和selector。可以这样说，shape和selector在美化控件中的作用是至关重要的。
1.Shape
简介
作用：XML中定义的几何形状
位置：res/drawable/文件的名称.xml

使用的方法：
Java代码中：R.drawable.文件的名称
XML中：android:background=”@drawable/文件的名称”
属性：
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android:shape=[“rectangle” | “oval” | “line” | “ring”]

其中rectagle矩形，oval椭圆，line水平直线，ring环形

中子节点的常用属性：

渐变

android:startColor 起始颜色

android:endColor 结束颜色

android:angle 渐变角度，0从上到下，90表示从左到右，数值为45的整数倍默认为0；

android:type 渐变的样式 liner线性渐变 radial环形渐变 sweep

填充

android:color 填充的颜色

描边

android:width 描边的宽度

android:color 描边的颜色

android:dashWidth 表示’-‘横线的宽度

android:dashGap 表示’-‘横线之间的距离

圆角

android:radius 圆角的半径 值越大角越圆

android:topRightRadius 右上圆角半径

android:bottomLeftRadius 右下圆角角半径

android:topLeftRadius 左上圆角半径

android:bottomRightRadius 左下圆角半径
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android:shape=[“rectangle” | “oval” | “line” | “ring”]

其中rectagle矩形，oval椭圆，line水平直线，ring环形

中子节点的常用属性：

渐变

android:startColor 起始颜色

android:endColor 结束颜色

android:angle 渐变角度，0从上到下，90表示从左到右，数值为45的整数倍默认为0；

android:type 渐变的样式 liner线性渐变 radial环形渐变 sweep

填充

android:color 填充的颜色

描边

android:width 描边的宽度

android:color 描边的颜色

android:dashWidth 表示’-‘横线的宽度

android:dashGap 表示’-‘横线之间的距离

圆角

android:radius 圆角的半径 值越大角越圆

android:topRightRadius 右上圆角半径

android:bottomLeftRadius 右下圆角角半径

android:topLeftRadius 左上圆角半径

android:bottomRightRadius 左下圆角半径

2.Selector
简介
位置：res/drawable/文件的名称.xml
使用的方法：
Java代码中：R.drawable.文件的名称
XML中：android:background=”@drawable/文件的名称”
selector.xml
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<?xml version=”1.0” encoding=”utf-8”?>

    <item android:state_selected="true">  
        <shape>  
            <gradient android:angle="270" android:endColor="#99BD4C"  
                android:startColor="#A5D245" />  
            <size android:height="60dp" android:width="320dp" />  
            <corners android:radius="8dp" />  
        </shape>  
    </item>  
    <item android:state_pressed="true">  
        <shape>  
            <gradient android:angle="270" android:endColor="#99BD4C"  
                android:startColor="#A5D245"/>  
            <size android:height="60dp" android:width="320dp" />  
            <corners android:radius="8dp" />  
        </shape>  
    </item>  
    <item>  
        <shape>  
            <gradient android:angle="270" android:endColor="#A8C3B0"  
                android:startColor="#C6CFCE"/>  
            <size android:height="60dp" android:width="320dp" />  
            <corners android:radius="8dp" />  
        </shape>  
    </item>  
</selector>

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<?xml version=”1.0” encoding=”utf-8”?>

    <item android:state_selected="true">   
        <shape>   
            <gradient android:angle="270" android:endColor="#99BD4C"   
                android:startColor="#A5D245" />   
            <size android:height="60dp" android:width="320dp" />   
            <corners android:radius="8dp" />   
        </shape>   
    </item>   
    <item android:state_pressed="true">   
        <shape>   
            <gradient android:angle="270" android:endColor="#99BD4C"   
                android:startColor="#A5D245"/>   
            <size android:height="60dp" android:width="320dp" />   
            <corners android:radius="8dp" />   
        </shape>   
    </item>   
    <item>   
        <shape>   
            <gradient android:angle="270" android:endColor="#A8C3B0"   
                android:startColor="#C6CFCE"/>   
            <size android:height="60dp" android:width="320dp" />   
            <corners android:radius="8dp" />   
        </shape>   
    </item>   
</selector>

list_item.xml
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<?xml version=”1.0” encoding=”utf-8”?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android“
android:orientation=”horizontal”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:background=”@drawable/selector” 

   >                      
   <ImageView    
       android:id="@+id/img"     
       android:layout_width="wrap_content"    
       android:layout_height="wrap_content"               
       android:layout_gravity="center_vertical"  
       android:layout_marginLeft="20dp"           
       />                             
       <TextView    
           android:text="data"    
           android:id="@+id/title"  
           android:layout_width="fill_parent"    
           android:layout_height="wrap_content"    
           android:gravity="center_vertical"     
           android:layout_marginLeft="20dp"    
           android:layout_marginTop="20dp"    
           android:textSize="14sp"                            
           android:textStyle="bold"  
           android:textColor="@color/black"                           
           >  
       </TextView>            
</LinearLayout>

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<?xml version=”1.0” encoding=”utf-8”?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android“
android:orientation=”horizontal”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:background=”@drawable/selector” 

   >                       
   <ImageView     
       android:id="@+id/img"      
       android:layout_width="wrap_content"     
       android:layout_height="wrap_content"                
       android:layout_gravity="center_vertical"   
       android:layout_marginLeft="20dp"            
       />                              
       <TextView     
           android:text="data"     
           android:id="@+id/title"   
           android:layout_width="fill_parent"     
           android:layout_height="wrap_content"     
           android:gravity="center_vertical"      
           android:layout_marginLeft="20dp"     
           android:layout_marginTop="20dp"     
           android:textSize="14sp"                             
           android:textStyle="bold"   
           android:textColor="@color/black"                            
           >   
       </TextView>             
</LinearLayout>

main.xml
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<?xml version=”1.0” encoding=”utf-8”?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android“
android:orientation=”vertical”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:background=”#253853” 

        >                                  
        <ListView    
          android:id="@+id/list"    
          android:layout_width="match_parent"    
          android:layout_height="match_parent"  
          android:cacheColorHint="#00000000"  
          android:divider="#2A4562"  
          android:dividerHeight="3px"  
          android:listSelector="#264365"  
          android:drawSelectorOnTop="false"   
          >  
        </ListView>    
</LinearLayout>

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<?xml version=”1.0” encoding=”utf-8”?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android“
android:orientation=”vertical”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:background=”#253853” 

        >                                   
        <ListView     
          android:id="@+id/list"     
          android:layout_width="match_parent"     
          android:layout_height="match_parent"   
          android:cacheColorHint="#00000000"   
          android:divider="#2A4562"   
          android:dividerHeight="3px"   
          android:listSelector="#264365"   
          android:drawSelectorOnTop="false"    
          >   
        </ListView>     
</LinearLayout>

colors.xml
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<?xml version=”1.0” encoding=”utf-8”?>

#FFFFFFFF
#00000000
#1C86EE
#A0cfef83
#464646

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<?xml version=”1.0” encoding=”utf-8”?>

#FFFFFFFF
#00000000
#1C86EE
#A0cfef83
#464646

MainActivity
[java] view plaincopy
package com.lingdududu.customlist; 

import java.util.ArrayList;   
import java.util.HashMap;   

import xb.customlist.R;   

import android.R.array;   
import android.app.Activity;   
import android.os.Bundle;   
import android.widget.ArrayAdapter;   
import android.widget.ListView;   
import android.widget.SimpleAdapter;   

public class MainActivity extends Activity {   
    ListView list;   

    String data[] = new String[]{   
            "China","UK","USA","Japan","German","Canada","ET","Narotu"     
    };   



    @Override  
    public void onCreate(Bundle savedInstanceState) {   
        super.onCreate(savedInstanceState);   
        setContentView(R.layout.main);   


        list =(ListView) findViewById(R.id.list);           

        SimpleAdapter adapter = new SimpleAdapter(this, getData(), R.layout.list_item,    
                new String[]{"title","img"}, new int[]{R.id.title,R.id.img});   

        list.setAdapter(adapter);           
    }   

    private ArrayList<HashMap<String, Object>> getData() {         
        ArrayList<HashMap<String, Object>> dlist = new ArrayList<HashMap<String,Object>>();   

        for(int i =0;i<data.length;i++){   
            HashMap<String, Object>map = new HashMap<String, Object>();            
            map.put("title", data[i]);   
            map.put("img", R.drawable.item_left2);   
            dlist.add(map);    
        }   
        return dlist;   
    }   
}

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package com.lingdududu.customlist; 

import java.util.ArrayList;    
import java.util.HashMap;    

import xb.customlist.R;    

import android.R.array;    
import android.app.Activity;    
import android.os.Bundle;    
import android.widget.ArrayAdapter;    
import android.widget.ListView;    
import android.widget.SimpleAdapter;    

public class MainActivity extends Activity {    
    ListView list;    

    String data[] = new String[]{    
            "China","UK","USA","Japan","German","Canada","ET","Narotu"      
    };    



    @Override   
    public void onCreate(Bundle savedInstanceState) {    
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.main);    


        list =(ListView) findViewById(R.id.list);            

        SimpleAdapter adapter = new SimpleAdapter(this, getData(), R.layout.list_item,     
                new String[]{"title","img"}, new int[]{R.id.title,R.id.img});    

        list.setAdapter(adapter);            
    }    

    private ArrayList<HashMap<String, Object>> getData() {          
        ArrayList<HashMap<String, Object>> dlist = new ArrayList<HashMap<String,Object>>();    

        for(int i =0;i<data.length;i++){    
            HashMap<String, Object>map = new HashMap<String, Object>();             
            map.put("title", data[i]);    
            map.put("img", R.drawable.item_left2);    
            dlist.add(map);     
        }    
        return dlist;    
    }    
}

原文地址：http://blog.csdn.net/wangwei_cq/article/details/9491967

Android
selector, shape