Android之shape与selector实现圆角

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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：

[html] view plaincopy
<shape>  android:shape=["rectangle" | "oval" | "line" | "ring"]  
  
其中rectagle矩形，oval椭圆，line水平直线，ring环形  
  
<shape>中子节点的常用属性：  
  
<gradient>  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  
  
<solid >  填充  
  
android:color  填充的颜色  
  
<stroke > 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  
  
<corners > 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"?>   
    <selector xmlns:android="http://schemas.android.com/apk/res/android">   
       
        <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>  

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>  

colors.xml

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<?xml version="1.0" encoding="utf-8"?>   
    <resources>   
        <color name="white">#FFFFFFFF</color>   
        <color name="transparency">#00000000</color>   
        <color name="title_bg">#1C86EE</color>   
        <color name="end_color">#A0cfef83</color>   
        <color name="black">#464646</color>   
    </resources>  

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;    
        }    
    }  

效果图：

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