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:
其中rectagle矩形,oval椭圆,line水平直线,ring环形
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
android:color 填充的颜色
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”
xml version="1.0" encoding="utf-8" ?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="@drawable/pic1" />
<item
android:state_window_focused="false"
android:drawable="@drawable/pic_blue"
/>
<item
android:state_focused="true"
android:state_pressed="true"
android:drawable= "@drawable/pic_red"
/>
<item
android:state_focused="false"
android:state_pressed="true"
android:drawable="@drawable/pic_pink"
/>
<item
android:state_selected="true"
android:drawable="@drawable/pic_orange"
/>
<item
android:state_focused="true"
android:drawable="@drawable/pic_green"
/>
selector>
第一个例子:圆角的Button
http://liangruijun.blog.51cto.com/3061169/630051
第二个例子:shape+selector综合使用的例子 漂亮的ListView
先看看这个例子的结构:
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>
list_item.xml
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
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">#FFFFFFFFcolor>
<color name="transparency">#00000000color>
<color name="title_bg">#1C86EEcolor>
<color name="end_color">#A0cfef83color>
<color name="black">#464646color>
resources>
MainActivity
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> getData() {
ArrayList> dlist = new ArrayList >();
for(int i =0;iHashMap map = new HashMap ();
map.put("title", data[i]);
map.put("img", R.drawable.item_left2);
dlist.add(map);
}
return dlist;
}
}
效果图:
上面的例子中用到很多关于颜色RGB的参数,对RGB不熟悉的,可以参照这篇文章 http://www.linuxidc.com/Linux/2012-01/52652p4.htm
转载:http://www.cnblogs.com/bill-joy/archive/2012/03/27/2419197.html