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[转]Android开发教程:shape和selector的结合使用

2012-07-18 21:23 916 查看
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"

<?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>

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

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">#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

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;
}
}

转自:http://www.cnblogs.com/top5/archive/2012/05/10/2494763.html
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