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    标题：8.12 Android WiFi开发实例演示

    Android SDK 提供了 WIFI 开发的相关 API，被保存在 android.net.wifi 和 android.net.wifi.p2p 包下。借助于 Android SDK 提供的相关开发类，可以方便地在 Android 系统的手机上开发基于 WIFI 的应用程序。

    实例 WIFIDemo 演示了使用 WIFI 进行连接设备搜索并获取相应信息的过程，运行效果如图 1 所示。

    WIFIDemo 运行结果
    图 1  WIFIDemo 运行结果

    实例 WIFIDemo 中所使用的布局文件 main.xml 的内容如下： 
    1. <?xml version="1.0" encoding="utf-8"?>
    2. <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    3.     android:id="@+id/mScrollView"
    4.     android:layout_width="fill_parent"
    5.     android:layout_height="wrap_content"
    6.     android:scrollbars="vertical">
    7.  
    8.     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    9.         android:layout_width="fill_parent"
    10.         android:layout_height="fill_parent"
    11.         android:orientation="vertical">
    12.  
    13.         <LinearLayout
    14.             android:layout_width="wrap_content"
    15.             android:layout_height="wrap_content"
    16.             android:orientation="horizontal">
    17.  
    18.             <Button
    19.                 android:id="@+id/open_bt"
    20.                 android:layout_width="wrap_content"
    21.                 android:layout_height="wrap_content"
    22.                 android:text="打开wifi" />
    23.  
    24.             <Button
    25.                 android:id="@+id/close_bt"
    26.                 android:layout_width="wrap_content"
    27.                 android:layout_height="wrap_content"
    28.                 android:text="关闭wifi" />
    29.  
    30.             <Button
    31.                 android:id="@+id/check_bt"
    32.                 android:layout_width="wrap_content"
    33.                 android:layout_height="wrap_content"
    34.                 android:text="检查wifi" />
    35.  
    36.             <Button
    37.                 android:id="@+id/search_bt"
    38.                 android:layout_width="wrap_content"
    39.                 android:layout_height="wrap_content"
    40.                 android:text="扫描wifi" />
    41.         </LinearLayout>
    42.  
    43.         <TextView
    44.             android:id="@+id/text"
    45.             android:layout_width="wrap_content"
    46.             android:layout_height="wrap_content"
    47.             android:text="null" />
    48.     </LinearLayout>
    49. </ScrollView>
    实例 WIFIDemo 中 AndroidManifest.xml 文件的代码如下： 
    1. <?xml version="1.0" encoding="utf-8"?>
    2. <manifest xmlns:android="http://schemas.android.com/apk/res/android"
    3.     package="introduction.android.wifidemo">
    4.  
    5.     <uses-sdk android:minSdkVersion="10" />
    6.  
    7.     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
    8.     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
    9.     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    10.     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    11.    
    12.     <application
    13.         android:allowBackup="true"
    14.         android:icon="@mipmap/ic_launcher"
    15.         android:label="@string/app_name"
    16.         android:roundIcon="@mipmap/ic_launcher_round"
    17.         android:supportsRtl="true"
    18.         android:theme="@style/AppTheme">
    19.         <activity android:name=".MainActivity">
    20.             <intent-filter>
    21.                 <action android:name="android.intent.action.MAIN" />
    22.                 <category android:name="android.intent.category.LAUNCHER" />
    23.             </intent-filter>
    24.         </activity>
    25.     </application>
    26.  
    27. </manifest>
    实例 WIFIDemo 中主 Activity 文件 MainActivity.java 的代码如下： 
    1. package introduction.android.wifidemo;
    2.  
    3. import java.util.List;
    4.  
    5. import android.R.string;
    6. import android.app.Activity;
    7. import android.content.Context;
    8. import android.net.wifi.ScanResult;
    9. import android.net.wifi.WifiInfo;
    10. import android.net.wifi.WifiManager;
    11. import android.os.Bundle;
    12. import android.view.View;
    13. import android.view.View.OnClickListener;
    14. import android.widget.Button;
    15. import android.widget.ScrollView;
    16. import android.widget.TextView;
    17. import android.widget.Toast;
    18.  
    19. public class MainActivity extends Activity {
    20.     private Button open_bt, close_bt, check_bt, search_bt;
    21.     private TextView textView;
    22.     private WifiManager wifiManager;
    23.     private WifiInfo wifiInfo;
    24.     private ScrollView scrollView;
    25.     private List WifiConfiguration;
    26.     private ScanResult scanResult;
    27.     private List<ScanResult> WifiList;
    28.     private StringBuffer stringBuffer = new StringBuffer();
    29.  
    30.     /**
    31.      * Called when the activity is first created.
    32.      */
    33.     public void onCreate(Bundle savedInstanceState) {
    34.         super.onCreate(savedInstanceState);
    35.         setContentView(R.layout.activity_main);
    36.  
    37.         scrollView = (ScrollView) findViewById(R.id.mScrollView);
    38.         open_bt = (Button) findViewById(R.id.open_bt);
    39.         close_bt = (Button) findViewById(R.id.close_bt);
    40.         check_bt = (Button) findViewById(R.id.check_bt);
    41.         search_bt = (Button) findViewById(R.id.search_bt);
    42.         textView = (TextView) findViewById(R.id.text);
    43.  
    44.         open_bt.setOnClickListener(new open_btListener());
    45.         close_bt.setOnClickListener(new close_btListener());
    46.         check_bt.setOnClickListener(new check_btListener());
    47.         search_bt.setOnClickListener(new search_btListener());
    48.  
    49.     }
    50.  
    51.     class search_btListener implements OnClickListener {
    52.         public void onClick(View v) {
    53.             // TODO Auto-generated method stub
    54.             wifiManager.startScan();
    55.             WifiList = wifiManager.getScanResults();
    56.             wifiInfo = wifiManager.getConnectionInfo();
    57.             if (stringBuffer != null) {
    58.                 stringBuffer = new StringBuffer();
    59.             }
    60.             stringBuffer = stringBuffer.append("Wifi名").append(" ").append("Wifi地址").append(" ")
    61.                     .append("Wifi频率").append("").append("Wifi信号")
    62.                     .append("\n");
    63.             if (WifiList != null) {
    64.                 for (int i = 0; i < WifiList.size(); i++) {
    65.                     scanResult = WifiList.get(i);
    66.                     stringBuffer = stringBuffer.append(scanResult.SSID).append(" ")
    67.                             .append(scanResult.BSSID).append(" ")
    68.                             .append(scanResult.frequency).append(" ")
    69.                             .append(scanResult.level).append("\n");
    70.                     textView.setText(stringBuffer.toString());
    71.                 }
    72.  
    73.                 stringBuffer = stringBuffer.append
    74.                         ("-----------------------------------------------").append("\n");
    75.                 textView.setText(stringBuffer.toString());
    76.                 stringBuffer = stringBuffer.append("当前Wifi—BSSID").append(":").append(wifiInfo.getBSSID()).append("\n")
    77.                         .append("当前wifi—HiddenSSID").append(": ").append(wifiInfo.getHiddenSSID()).append("\n")
    78.                         .append("当前Wifi—IpAddress").append(": ").append(wifiInfo.getIpAddress()).append("\n")
    79.                         .append("当前Wifi—LinkSpeed").append(": ").append(wifiInfo.getLinkSpeed()).append("\n")
    80.                         .append("当前Wifi—MacAddress").append(": ").append(wifiInfo.getMacAddress()).append("\n")
    81.                         .append("当前Wifi—Network ID").append(": ").append(wifiInfo.getNetworkId()).append("\n")
    82.                         .append("当前Wifi—RSSI").append(": ").append(wifiInfo.getRssi()).append("\n")
    83.                         .append("当前Wifi—SSID").append(": ").append(wifiInfo.getSSID()).append("\n")
    84.                         .append("-----------------------------------------------").append("\n")
    85.                         .append("全部打印出关于本机Wifi信息").append(": ").append
    86.                                 (wifiInfo.toString());
    87.                 textView.setText(stringBuffer.toString());
    88.             }
    89.             //stringBuffer=stringBuffer.append("-----------------------------------------------").append("\n");
    90.             //textView.setText()
    91.         }
    92.     }
    93.  
    94.     class check_btListener implements OnClickListener {
    95.         public void onClick(View v) {
    96.             // TODO Auto-generated method stub
    97.             wifiManager = (WifiManager) MainActivity.this
    98.                     .getSystemService(Context.WIFI_SERVICE);
    99.             System.out.println(wifiManager.getWifiState());
    100.             Toast.makeText(MainActivity.this,
    101.                     "当前网卡状态为:" + change(), Toast.LENGTH_SHORT)
    102.                     .show();
    103.         }
    104.     }
    105.  
    106.  
    107.     class close_btListener implements OnClickListener {
    108.         public void onClick(View v) {
    109.             // TODO Auto-generated method stub
    110.             wifiManager = (WifiManager) MainActivity.this
    111.                     .getSystemService(Context.WIFI_SERVICE);
    112.             wifiManager.setWifiEnabled(false);
    113.             System.out.println(wifiManager.getWifiState());
    114.             Toast.makeText(MainActivity.this,
    115.                     "当前网卡状态为" + change(), Toast.LENGTH_SHORT)
    116.                     .show();
    117.         }
    118.     }
    119.  
    120.     class open_btListener implements OnClickListener {
    121.         public void onClick(View v) {
    122.             // TODO Auto-generated method stub
    123.             wifiManager = (WifiManager) MainActivity.this.getSystemService(Context.WIFI_SERVICE);
    124.             wifiManager.setWifiEnabled(true);
    125.             System.out.println(wifiManager.getWifiState());
    126.             Toast.makeText(MainActivity.this,
    127.                     "当前网卡状态为" + change(), Toast.LENGTH_SHORT)
    128.                     .show();
    129.         }
    130.     }
    131.  
    132.     public String change() {
    133.         String temp = null;
    134.         switch (wifiManager.getWifiState()) {
    135.             case 0:
    136.                 temp = "wifi正在关闭ING";
    137.                 break;
    138.             case 1:
    139.                 temp = "wifi已经关闭";
    140.                 break;
    141.             case 2:
    142.                 temp = "wifi正在打开ING";
    143.                 break;
    144.             case 3:
    145.                 temp = "wifi已经打开";
    146.                 break;
    147.             default:
    148.                 break;
    149.         }
    150.         return temp;
    151.     }
    152. }

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