WIFI列表

转载地址：http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141

版权声明：本文为博主原创文章，未经博主允许不得转载。

目录(?)[-]

1. 来自CODE的代码片 WIFIlayoutXML
2. 来自CODE的代码片 apdater
3. 来自CODE的代码片 datauptate
4. 来自CODE的代码片 setListener
5. 来自CODE的代码片 ItemListener

部分参考：http://l62s.iteye.com/blog/1675509

一个ListView通常有两个职责。

（1）将数据填充到布局。

（2）处理用户的选择点击等操作。

第一点很好理解，ListView就是实现这个功能的。第二点也不难做到。

一个ListView的创建需要3个元素。

（1）ListView中的每一列的View。

（2）填入View的数据或者图片等。

（3）连接数据与ListView的适配器。

首先了解下什么是适配器：

适配器是AdapterView视图（如ListView - 列表视图控件、Gallery - 缩略图浏览器控件、GridView - 网格控件、Spinner - 下拉列表控件、AutoCompleteTextView - 自动提示文本框、ExpandableListView - 支持展开/收缩功能的列表控件等）与数据之间的桥梁，用来处理数据并将数据绑定到AdapterView上。

android提供多种适配器，开发时可以针对数据源的不同采用最方便的适配器，也可以自定义适配器完成复杂功能。

补充：AdapterView对象有两个主要任务
          1. 在布局中显示数据
         2. 处理用户的选择

也就是说，适配器能有效地实现数据与AdapterView的分离设置，使AdapterView与数据的绑定更加简便，修改更加方便

Android中提供了很多的Adapter，表1列出了常用的几个。

表1 常用适配器

Adapter	含义
ArrayAdapter<T>	用来绑定一个数组，支持泛型操作
SimpleAdapter	用来绑定在xml中定义的控件对应的数据
SimpleCursorAdapter	用来绑定游标得到的数据
BaseAdapter	通用的基础适配器

 下面以自己的一个对ListView控件的简单应用，介绍下使用ListView 的操作步骤。

目的：实现对搜索到的WIFI信号的列表显示，至于WIFi的使用后面讲。

1、定义好布局文件。布局文件中包含一个Button和一个ListView。

<a target=_blank id="L1" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L1" rel="#L1" style="color: rgb(102, 102, 102); text-decoration: none;"> 1</a> <a target=_blank id="L2" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L2" rel="#L2" style="color: rgb(102, 102, 102); text-decoration: none;"> 2</a> <a target=_blank id="L3" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L3" rel="#L3" style="color: rgb(102, 102, 102); text-decoration: none;"> 3</a> <a target=_blank id="L4" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L4" rel="#L4" style="color: rgb(102, 102, 102); text-decoration: none;"> 4</a> <a target=_blank id="L5" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L5" rel="#L5" style="color: rgb(102, 102, 102); text-decoration: none;"> 5</a> <a target=_blank id="L6" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L6" rel="#L6" style="color: rgb(102, 102, 102); text-decoration: none;"> 6</a> <a target=_blank id="L7" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L7" rel="#L7" style="color: rgb(102, 102, 102); text-decoration: none;"> 7</a> <a target=_blank id="L8" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L8" rel="#L8" style="color: rgb(102, 102, 102); text-decoration: none;"> 8</a> <a target=_blank id="L9" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L9" rel="#L9" style="color: rgb(102, 102, 102); text-decoration: none;"> 9</a> <a target=_blank id="L10" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L10" rel="#L10" style="color: rgb(102, 102, 102); text-decoration: none;"> 10</a> <a target=_blank id="L11" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L11" rel="#L11" style="color: rgb(102, 102, 102); text-decoration: none;"> 11</a> <a target=_blank id="L12" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L12" rel="#L12" style="color: rgb(102, 102, 102); text-decoration: none;"> 12</a> <a target=_blank id="L13" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L13" rel="#L13" style="color: rgb(102, 102, 102); text-decoration: none;"> 13</a> <a target=_blank id="L14" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L14" rel="#L14" style="color: rgb(102, 102, 102); text-decoration: none;"> 14</a> <a target=_blank id="L15" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L15" rel="#L15" style="color: rgb(102, 102, 102); text-decoration: none;"> 15</a> <a target=_blank id="L16" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L16" rel="#L16" style="color: rgb(102, 102, 102); text-decoration: none;"> 16</a> <a target=_blank id="L17" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L17" rel="#L17" style="color: rgb(102, 102, 102); text-decoration: none;"> 17</a> <a target=_blank id="L18" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L18" rel="#L18" style="color: rgb(102, 102, 102); text-decoration: none;"> 18</a> <a target=_blank id="L19" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L19" rel="#L19" style="color: rgb(102, 102, 102); text-decoration: none;"> 19</a> <a target=_blank id="L20" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L20" rel="#L20" style="color: rgb(102, 102, 102); text-decoration: none;"> 20</a> <a target=_blank id="L21" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L21" rel="#L21" style="color: rgb(102, 102, 102); text-decoration: none;"> 21</a> <a target=_blank id="L22" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L22" rel="#L22" style="color: rgb(102, 102, 102); text-decoration: none;"> 22</a> <a target=_blank id="L23" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L23" rel="#L23" style="color: rgb(102, 102, 102); text-decoration: none;"> 23</a> <a target=_blank id="L24" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L24" rel="#L24" style="color: rgb(102, 102, 102); text-decoration: none;"> 24</a>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" android:gravity="center_horizontal" android:background="@color/burlywood" tools:context=".ControlPCMainActivity" > <Button android:id="@+id/wifiSearchButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:text="搜索WIFI信号"/> <ListView android:id="@+id/wifiListView" android:layout_width="match_parent" android:layout_height="wrap_content" android:cursorVisible="false" android:singleLine="false"/> </LinearLayout>

 来自CODE的代码片

WIFIlayout.XML

2、在Activity中定义一个ArrayAdapter，然后为LIstView绑定一个Adapter。

<a target=_blank id="L1" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L1" rel="#L1" style="color: rgb(102, 102, 102); text-decoration: none;"> 1</a> <a target=_blank id="L2" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L2" rel="#L2" style="color: rgb(102, 102, 102); text-decoration: none;"> 2</a> <a target=_blank id="L3" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L3" rel="#L3" style="color: rgb(102, 102, 102); text-decoration: none;"> 3</a>

wifiSearchListView = (ListView)findViewById(R.id.wifiListView); arrayWifiAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,wifiListString); wifiSearchListView.setAdapter(arrayWifiAdapter);

 来自CODE的代码片

apdater

重点讲解下new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,wifiListString)；

首先对ArrayAdapter的参数进行说明：

第一个参数：为上下文，此处指定的this为Activity

第二个参数：一个包含TextView,用来填充ListView的每一行的布局资源ID，这个可以自定义一个Layout，但是Layout中必须得包含TextView控件。这个自定义布局文件之前有介绍 http://blog.youkuaiyun.com/liuhui_8989/article/details/22941581，此处使用的是系统提供的Layout布局。

第三个参数：为ListView的内容，此处为private List<String> wifiListString = new ArrayList<String>();存储的是WIFI信号的信息。

ListView是通过绑定一个适配器来实现自身数据的更新的，即代码中的wifiSearchListView.setAdapter(arrayWifiAdapter);

3、数据更新，此处主要是搜索WIFI信号，将搜索出来的WIFi信号进行列表显示。

<a target=_blank id="L1" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L1" rel="#L1" style="color: rgb(102, 102, 102); text-decoration: none;"> 1</a> <a target=_blank id="L2" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L2" rel="#L2" style="color: rgb(102, 102, 102); text-decoration: none;"> 2</a> <a target=_blank id="L3" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L3" rel="#L3" style="color: rgb(102, 102, 102); text-decoration: none;"> 3</a> <a target=_blank id="L4" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L4" rel="#L4" style="color: rgb(102, 102, 102); text-decoration: none;"> 4</a> <a target=_blank id="L5" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L5" rel="#L5" style="color: rgb(102, 102, 102); text-decoration: none;"> 5</a> <a target=_blank id="L6" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L6" rel="#L6" style="color: rgb(102, 102, 102); text-decoration: none;"> 6</a> <a target=_blank id="L7" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L7" rel="#L7" style="color: rgb(102, 102, 102); text-decoration: none;"> 7</a> <a target=_blank id="L8" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L8" rel="#L8" style="color: rgb(102, 102, 102); text-decoration: none;"> 8</a> <a target=_blank id="L9" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L9" rel="#L9" style="color: rgb(102, 102, 102); text-decoration: none;"> 9</a> <a target=_blank id="L10" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L10" rel="#L10" style="color: rgb(102, 102, 102); text-decoration: none;"> 10</a> <a target=_blank id="L11" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L11" rel="#L11" style="color: rgb(102, 102, 102); text-decoration: none;"> 11</a> <a target=_blank id="L12" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L12" rel="#L12" style="color: rgb(102, 102, 102); text-decoration: none;"> 12</a> <a target=_blank id="L13" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L13" rel="#L13" style="color: rgb(102, 102, 102); text-decoration: none;"> 13</a> <a target=_blank id="L14" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L14" rel="#L14" style="color: rgb(102, 102, 102); text-decoration: none;"> 14</a> <a target=_blank id="L15" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L15" rel="#L15" style="color: rgb(102, 102, 102); text-decoration: none;"> 15</a> <a target=_blank id="L16" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L16" rel="#L16" style="color: rgb(102, 102, 102); text-decoration: none;"> 16</a>

//ScanResult类型转为String public void scanResultToString(List<ScanResult> listScan,List<String> listStr){ for(int i = 0; i < listScan.size(); i++){ ScanResult strScan = listScan.get(i); String str = strScan.SSID+"--"+strScan.BSSID; boolean bool = listStr.add(str); if(bool){ arrayWifiAdapter.notifyDataSetChanged();//数据更新,只能单个Item更新，不能够整体List更新 } else{ Log.i("scanResultToSting","Addfail"); } Log.i("scanResultToString",listStr.get(i)); } }

 来自CODE的代码片

datauptate

这个函数的功能是实现对搜索到的WIFI信号的处理，listScan存储的是搜索到的WIFI信号信息，包含内容比较多。我在ListView中只显示WIFI的名称SSID和地址BSSID，两项保存在listStr，即实参 wifiListString中。

此处要特别注意之前对数据的更新，是对数据处理完成后对wifiListString整体更新，结果是失败的。最终找到原因是只能够对wifiListString中的单个Item进行更新。

通过绑定的适配器Adapter方法通知数据的更新：arrayWifiAdapter.notifyDataSetChanged();

4、数据更新完成后就是要实现对ListView中Item的点击事件，以及点击后颜色的变化。

首先为ListView设定监听器

<a target=_blank id="L1" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L1" rel="#L1" style="color: rgb(102, 102, 102); text-decoration: none;"> 1</a> <a target=_blank id="L2" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L2" rel="#L2" style="color: rgb(102, 102, 102); text-decoration: none;"> 2</a>

ListOnItemClickListener wifiListListener = new ListOnItemClickListener(); wifiSearchListView.setOnItemClickListener(wifiListListener);

 来自CODE的代码片

setListener

下面为对监听器Click事件的重写

<a target=_blank id="L1" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L1" rel="#L1" style="color: rgb(102, 102, 102); text-decoration: none;"> 1</a> <a target=_blank id="L2" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L2" rel="#L2" style="color: rgb(102, 102, 102); text-decoration: none;"> 2</a> <a target=_blank id="L3" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L3" rel="#L3" style="color: rgb(102, 102, 102); text-decoration: none;"> 3</a> <a target=_blank id="L4" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L4" rel="#L4" style="color: rgb(102, 102, 102); text-decoration: none;"> 4</a> <a target=_blank id="L5" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L5" rel="#L5" style="color: rgb(102, 102, 102); text-decoration: none;"> 5</a> <a target=_blank id="L6" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L6" rel="#L6" style="color: rgb(102, 102, 102); text-decoration: none;"> 6</a> <a target=_blank id="L7" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L7" rel="#L7" style="color: rgb(102, 102, 102); text-decoration: none;"> 7</a> <a target=_blank id="L8" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L8" rel="#L8" style="color: rgb(102, 102, 102); text-decoration: none;"> 8</a> <a target=_blank id="L9" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L9" rel="#L9" style="color: rgb(102, 102, 102); text-decoration: none;"> 9</a> <a target=_blank id="L10" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L10" rel="#L10" style="color: rgb(102, 102, 102); text-decoration: none;"> 10</a> <a target=_blank id="L11" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L11" rel="#L11" style="color: rgb(102, 102, 102); text-decoration: none;"> 11</a> <a target=_blank id="L12" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L12" rel="#L12" style="color: rgb(102, 102, 102); text-decoration: none;"> 12</a> <a target=_blank id="L13" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L13" rel="#L13" style="color: rgb(102, 102, 102); text-decoration: none;"> 13</a> <a target=_blank id="L14" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L14" rel="#L14" style="color: rgb(102, 102, 102); text-decoration: none;"> 14</a> <a target=_blank id="L15" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L15" rel="#L15" style="color: rgb(102, 102, 102); text-decoration: none;"> 15</a> <a target=_blank id="L16" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L16" rel="#L16" style="color: rgb(102, 102, 102); text-decoration: none;"> 16</a> <a target=_blank id="L17" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L17" rel="#L17" style="color: rgb(102, 102, 102); text-decoration: none;"> 17</a> <a target=_blank id="L18" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L18" rel="#L18" style="color: rgb(102, 102, 102); text-decoration: none;"> 18</a> <a target=_blank id="L19" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L19" rel="#L19" style="color: rgb(102, 102, 102); text-decoration: none;"> 19</a> <a target=_blank id="L20" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L20" rel="#L20" style="color: rgb(102, 102, 102); text-decoration: none;"> 20</a> <a target=_blank id="L21" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L21" rel="#L21" style="color: rgb(102, 102, 102); text-decoration: none;"> 21</a> <a target=_blank id="L22" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L22" rel="#L22" style="color: rgb(102, 102, 102); text-decoration: none;"> 22</a> <a target=_blank id="L23" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L23" rel="#L23" style="color: rgb(102, 102, 102); text-decoration: none;"> 23</a> <a target=_blank id="L24" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L24" rel="#L24" style="color: rgb(102, 102, 102); text-decoration: none;"> 24</a> <a target=_blank id="L25" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L25" rel="#L25" style="color: rgb(102, 102, 102); text-decoration: none;"> 25</a> <a target=_blank id="L26" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L26" rel="#L26" style="color: rgb(102, 102, 102); text-decoration: none;"> 26</a> <a target=_blank id="L27" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L27" rel="#L27" style="color: rgb(102, 102, 102); text-decoration: none;"> 27</a> <a target=_blank id="L28" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L28" rel="#L28" style="color: rgb(102, 102, 102); text-decoration: none;"> 28</a> <a target=_blank id="L29" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L29" rel="#L29" style="color: rgb(102, 102, 102); text-decoration: none;"> 29</a> <a target=_blank id="L30" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L30" rel="#L30" style="color: rgb(102, 102, 102); text-decoration: none;"> 30</a> <a target=_blank id="L31" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L31" rel="#L31" style="color: rgb(102, 102, 102); text-decoration: none;"> 31</a> <a target=_blank id="L32" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L32" rel="#L32" style="color: rgb(102, 102, 102); text-decoration: none;"> 32</a> <a target=_blank id="L33" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L33" rel="#L33" style="color: rgb(102, 102, 102); text-decoration: none;"> 33</a> <a target=_blank id="L34" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L34" rel="#L34" style="color: rgb(102, 102, 102); text-decoration: none;"> 34</a> <a target=_blank id="L35" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L35" rel="#L35" style="color: rgb(102, 102, 102); text-decoration: none;"> 35</a> <a target=_blank id="L36" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L36" rel="#L36" style="color: rgb(102, 102, 102); text-decoration: none;"> 36</a> <a target=_blank id="L37" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L37" rel="#L37" style="color: rgb(102, 102, 102); text-decoration: none;"> 37</a> <a target=_blank id="L38" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L38" rel="#L38" style="color: rgb(102, 102, 102); text-decoration: none;"> 38</a> <a target=_blank id="L39" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L39" rel="#L39" style="color: rgb(102, 102, 102); text-decoration: none;"> 39</a> <a target=_blank id="L40" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L40" rel="#L40" style="color: rgb(102, 102, 102); text-decoration: none;"> 40</a> <a target=_blank id="L41" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L41" rel="#L41" style="color: rgb(102, 102, 102); text-decoration: none;"> 41</a> <a target=_blank id="L42" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L42" rel="#L42" style="color: rgb(102, 102, 102); text-decoration: none;"> 42</a> <a target=_blank id="L43" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L43" rel="#L43" style="color: rgb(102, 102, 102); text-decoration: none;"> 43</a> <a target=_blank id="L44" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L44" rel="#L44" style="color: rgb(102, 102, 102); text-decoration: none;"> 44</a> <a target=_blank id="L45" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L45" rel="#L45" style="color: rgb(102, 102, 102); text-decoration: none;"> 45</a> <a target=_blank id="L46" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L46" rel="#L46" style="color: rgb(102, 102, 102); text-decoration: none;"> 46</a> <a target=_blank id="L47" href="http://blog.youkuaiyun.com/liuhui_8989/article/details/22945141#L47" rel="#L47" style="color: rgb(102, 102, 102); text-decoration: none;"> 47</a>

class ListOnItemClickListener implements OnItemClickListener{ String wifiItemSSID = null; private View selectedItem; @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub selectedItem = arg1; arg1.setBackgroundResource(R.color.gray);//点击的Item项背景设置 String wifiItem = arrayWifiAdapter.getItem(arg2);//获得选中的设备 String []ItemValue = wifiItem.split("--"); wifiItemSSID = ItemValue[0]; int wifiItemId = localWifiUtils.IsConfiguration("\""+wifiItemSSID+"\""); if(wifiItemId != -1){ if(localWifiUtils.ConnectWifi(wifiItemId)){//连接指定WIFI arg1.setBackgroundResource(R.color.green); } } else{//没有配置好信息，配置 WifiPswDialog pswDialog = new WifiPswDialog(ControlPCMainActivity.this,new OnCustomDialogListener() { @Override public void back(String str) { // TODO Auto-generated method stub wifiPassword = str; if(wifiPassword != null){ int netId = localWifiUtils.AddWifiConfig(wifiResultList,wifiItemSSID, wifiPassword); Log.i("WifiPswDialog",String.valueOf(netId)); if(netId != -1){ localWifiUtils.getConfiguration();//添加了配置信息，要重新得到配置信息 if(localWifiUtils.ConnectWifi(netId)){ selectedItem.setBackgroundResource(R.color.green); } } else{ Toast.makeText(ControlPCMainActivity.this, "网络连接错误", Toast.LENGTH_SHORT).show(); selectedItem.setBackgroundResource(R.color.burlywood); } } else{ selectedItem.setBackgroundResource(R.color.burlywood); } } }); pswDialog.show(); } } }

 来自CODE的代码片

ItemListener

这段代码中设计到WIFI的一些操作，参考下以后的WIFI的操作文章吧。另外dialog的实现也会将实现过程写出来。

通过代码中可以看出来Item的点击事件主要是通过继承OnItemClickListener接口实现对点击事件的处理。   

首先说明下onItemClick里面的四个参数，参考： http://blog.youkuaiyun.com/catherine880619/article/details/6796561

arg0参数：指的当前的适配器，可以通过它获得适配器里面的所有内容

arg1参数：当前选中的Item的View。ListView里面是由各个View构成的，一些View就构成了ListView。

arg2参数：Item在适配器中的位置

arg3参数：当前Item在ListView中的相对位置，第几行

设定选中Item颜色：arg1.setBackgroundResource(R.color.gray);

另外还有另外一种方法是：

clientBltList.requestFocusFromTouch();//clientBltList为ListView的实例
clientBltList.getSelectedView().setBackgroundColor(R.color.green);

得到选中Item的内容：arrayWifiAdapter.getItem(arg2);

在颜色变化的实现中遇到的问题：本身要实现效果是是点击后Item变为灰色，WIFI连接成功后变为绿色。但是实现过程中发现当上下滑动WIFI列表时候会出现多个WIFI信号变为绿色。而且绿色的位置也会发生变化。一直未解决。

效果图                                                          滑动前                                              滑动后

原因分析：主要是因为ListView 的显示采用了一种优化方法，当调用LIstView显示里面内容时候是通过重写getView()方法实现的。getView ()方法中的参数convertView作为一个缓存，当有条目不可见时，它缓存了它的数据，当上下滑动显示出来该条目数据时候只需要更新数据就可以，这样就重复利用了绘制的View，大大节省了系统开销。这样的重复利用导致了每个Item的位置ID发生滑动时候发生了变化。所以颜色变化的条目就发生了变化。例如全屏显示6个条目，当Item1显示为绿色，滑动时候Item1不可见，测出的View就被下面显示Item重用更新数据，导致下面数据的ID和Item1的ID一样，所以颜色同样变为了绿色。这只是本人的理解。。。。

原因分析参考网址： http://www.cnblogs.com/noTice520/archive/2011/12/05/2276379.html

                                                        http://mobile.51cto.com/android-265197_all.htm

参考的内容为下面

相关project源码：http://download.youkuaiyun.com/detail/liuhui_8989/7154671

有错误多多指出