shape和selector的结合使用

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：

<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"

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8" ?>     <selector xmlns:Android="http://schemas.android.com/apk/res/android">   <!-- 默认时的背景图片-->    <item Android:drawable="@drawable/pic1" />      <!-- 没有焦点时的背景图片 -->    <item    Android:state_window_focused="false"         android:drawable="@drawable/pic_blue"    />     <!-- 非触摸模式下获得焦点并单击时的背景图片 -->    <item    Android:state_focused="true"    android:state_pressed="true"      android:drawable= "@drawable/pic_red"    />   <!-- 触摸模式下单击时的背景图片-->    <item    Android:state_focused="false"    Android:state_pressed="true"      Android:drawable="@drawable/pic_pink"    />    <!--选中时的图片背景-->    <item    Android:state_selected="true"    android:drawable="@drawable/pic_orange"    />     <!--获得焦点时的图片背景-->    <item    Android:state_focused="true"    Android:drawable="@drawable/pic_green"    />     </selector></span>

第一个例子：圆角的Button

第二个例子：shape+selector综合使用的例子 漂亮的ListView

<span style="font-size:18px;">selector.xml<?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> </span>

list_item.xml

<span style="font-size:18px;"><?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> </span>

main.xml

<span style="font-size:18px;"><?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<?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.xml</span>

<span style="font-size:18px;">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"        };      /** Called when the activity is first created. */     @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;      }  }</span>