安卓版本：4.4.2 运行平台：广州微嵌安卓工业平板

1、安卓使用wifi模块需在AndroidMainfest.xml声明权限：

允许程序改变Wi-Fi连接状态 <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/> 允许程序访问Wi-Fi网络状态信息 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>

2、获取WifiManager的实例，用于操作wifi:

wifiManager = (WifiManager)getSystemService(Service.WIFI_SERVICE);

3、打开或关闭wifi

//isChecked为true表示打开wifi,false关闭WiFi if(!wifiManager.wifiEnable(isChecked)) { Toast.makeText(MainActivity.this,"WifisetEnabledfaled", Toast.LENGTH_SHORT).show();; } //获取WiFi当前的状态 switch(wifiManager.getWifiState()) { //wifi处于关闭状态 case WifiManager.WIFI_STATE_DISABLED: enableSwitch.setChecked(false); break; //wifi处于打开状态 case WifiManager.WIFI_STATE_ENABLED: enableSwitch.setChecked(true); //该方法用于开始扫描附近的wifi热点 wifiManager.startScan(); break; }

4、注册wifi的相应广播监听wifi的状态改变：

//扫描到可用的wifi热点 WifiManager.SCAN_RESULTS_AVAILABLE_ACTION //wifi状态改变 WifiManager.WIFI_STATE_CHANGED_ACTION //wifi请求连接成功或失败 WifiManager.SUPPLICANT_STATE_CHANGED_ACTION //wifi连接或断开状态改变， ConnectivityManager.CONNECTIVITY_ACTION //wifi热点状态改变 "android.net.wifi.WIFI_AP_STATE_CHANGED" 定义BroadcastReceiver接收广播： class WifiReceiver extends BroadcastReceiver { public void onReceive(Context context, Intent intent) { //扫描到可用热点 if (intent.getAction().equals( WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) { //获取最近一次扫描到的wifi列表 resultList = wifiManager.getScanResults(); String[] result = mywifi.getString(resultList); int i=0; for(ScanResult scan:resultList){ //判断是否已保存了连接信息 if(mywifi.isSaveConfigtion(scan.SSID)!=null){ result[i] += ":已保存"; } i++; } } //wifi或热点的状态发生改变 else if(intent.getAction() .equals(WifiManager.WIFI_STATE_CHANGED_ACTION)|| intent.getAction() .equals("android.net.wifi.WIFI_AP_STATE_CHANGED")) { //获取wifi或热点当前的状态 switch(intent.getIntExtra("wifi_state", 0)){ //wifi状态变成关闭 case 1: adapter.clear(); stateText.setText("Wifi已关闭"); break; //WiFi状态变成打开 case 3: stateText.setText("Wifi已打开"); break; //热点状态变成打开 case 13 apstateText.setText("热点已打开"); break; //热点状态变成关闭 case 11: apstateText.setText("热点已关闭"); break; default: Log.d("STATE",String.valueOf(intent.getIntExtra("wifi_state", 0))); break; } } //连接状态发生改变 else if(intent.getAction().equals(ConnectivityManager.CONNECTIVITY_ACTION)) { boolean b = false; //获取当前的连接状态 boolean a = intent.getBooleanExtra("noConnectivity", b); if(!a) { //wifi连接成功，获取连接的wifi属性 System.out.println("连接成功"); } else { //wifi已断开连接 System.out.println("断开连接"); } } //wifi连接请求成功或失败 else if(intent.getAction().equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION)) { //获取连接wifi属性跟请求连接状态 WifiInfo info = wifiManager.getConnectionInfo(); SupplicantState state = info.getSupplicantState(); int flag =0; boolean connectflag = false; //连接请求成功 if (state == SupplicantState.COMPLETED) { Log.i("WifiReceiver", "(验证成功)"); SSIDText.setText(info.getSSID().substring(1,info.getSSID().length()-1)); //保存连接wifi信息 wifiManager.saveConfiguration(); flag =1; } //获取请求失败的错误值，判断是否属于验证失败 int errorCode = intent.getIntExtra( WifiManager.EXTRA_SUPPLICANT_ERROR, -1); if (errorCode == WifiManager.ERROR_AUTHENTICATING) { Log.i("WifiReceiver", "(验证失败)"); } } ｝ ｝

5、在扫描到wifi后获取wifi的具体属性：

//参数：扫描到的wifi列表 public String[] getString(List<ScanResult> wifiList) { ArrayList<String> listStr = new ArrayList<String>(); for (int i = 0; i < wifiList.size(); i++) { /*SSID:wifi的标示符，也就是名字 *capabilities:描述接入点支持的身份验证、密钥管理和加密方案 *level:wifi的信号强度 *WifiManager.calculateSignalLevel:将信号强度转换成信号等级 */ listStr.add(scan.SSID+":" +scan.capabilities+":" +String.valueOf(WifiManager.calculateSignalLevel(scan.level, 5))); } return listStr.toArray(new String[0]); }

6、获取当前wifi连入点的一些常用信息

WifiInfo connectInfo = wifiManager.getConnectionInfo(); //连接wifi的名字 connectInfo.getSSID(); //wifi的连接速度跟单位 connectInfo.getLinkSpeed(); connectInfo.LINK_SPEED_UNITS; //连接wifi的ip地址 connectInfo.getIpAddress(); //用下面的转换方法将connectInfo.getIpAddress()转换成String public String intToIp(int i) {return ((i >> 24 ) & 0xFF ) + "." + ((i >> 16 ) & 0xFF) + "." + ((i >> 8 ) & 0xFF) + "." + ( i & 0xFF) ; }

7、创建wifi信息用于wifi连接，分为无密码、WPA两种：

/*无密码连接: *SSID:wifi的标识符 *config:用于wifi连接的wifi信息 */ String SSID = ssid; WifiConfiguration config = new WifiConfiguration(); config.allowedAuthAlgorithms.clear(); config.allowedGroupCiphers.clear(); config.allowedKeyManagement.clear(); config.allowedPairwiseCiphers.clear(); config.allowedProtocols.clear(); config.SSID = "\"" + SSID + "\""; config.allowedAuthAlgorithms .set(WifiConfiguration.AuthAlgorithm.SHARED); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP104); config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); /*有密码连接: *SSID:wifi的标识符 *password:wifi密码 *config:用于wifi连接的wifi信息 */ String gol_password = password; WifiConfiguration config = new WifiConfiguration(); config.SSID = "\"" + ssid + "\""; config.preSharedKey = "\"" + gol_password + "\""; config.hiddenSSID = true; config.status = WifiConfiguration.Status.ENABLED; config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); config.allowedPairwiseCiphers .set(WifiConfiguration.PairwiseCipher.TKIP); config.allowedPairwiseCiphers .set(WifiConfiguration.PairwiseCipher.CCMP); config.allowedProtocols.set(WifiConfiguration.Protocol.RSN); //使用上面新建的WifiConfiguration config连接wifi: int wcgID = wifiManager.addNetwork(wifiConfig); //连接成功返回true,失败返回false boolean flag = wifiManager.enableNetwork(wcgID, true);

8、wifi断开连接：

//SSID:wifi的标示符 public boolean disconnectWifi(String SSID) { List<WifiConfiguration> existingConfigs = null; existingConfigs = wifiManager.getConfiguredNetworks();; for (WifiConfiguration existingConfig : existingConfigs) { if (existingConfig.SSID.equals("\"" + SSID + "\"")) { if(wifiManager.disableNetwork(existingConfig.networkId)) { return true; }else break; } } return false; }

9、判断wifi信息是否已保存:

public WifiConfiguration isSaveConfigtion(String SSID) { List <WifiConfiguration> existingConfigs = null; existingConfigs = wifiManager.getConfiguredNetworks();; for (WifiConfiguration existingConfig : existingConfigs) { if (existingConfig.SSID.equals("\"" + SSID + "\"")) { return existingConfig; } } return null; }

10、删除保存的wifi信息:

public boolean removeWifi(String SSID) { List<WifiConfiguration> existingConfigs; existingConfigs= wifiManager.getConfiguredNetworks(); for (WifiConfiguration existingConfig : existingConfigs) { if (existingConfig.SSID.equals("\"" + SSID + "\"")) { return wifiManager.removeNetwork(existingConfig.networkId); } } return false; }

至此wifi的打开、关闭、扫描、连接、断开等基本功能的开发就基本结束了，但是在日常的wifi使用中，我们不仅仅只是连接热点，有时也会开启安卓上的本地热点供其它安卓设备连接，所以下面的部分就是设置本地的wifi热点信息并打开等功能。

11、热点跟wifi不能同时使用，所以在打开热点前需先关闭掉wifi

//先判断wifi是否处于打开的状态，如果是则先关闭再打开热点 if(wifiManager.isWifiEnabled()){ wifiManager.setWifiEnabled(false); Toast.makeText(MainActivity.this, "关闭当前wifi,创建热点", Toast.LENGTH_SHORT).show(); }

创建热点信息：分为有密码、无密码

/*无密码热点： *SSID:热点名字 *config:热点信息 */ WifiConfiguration config = new WifiConfiguration(); config.SSID = ssid; config.wepTxKeyIndex = 0; config.wepKeys[0] = ""; config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); config.wepTxKeyIndex = 0; /*有密码热点: *SSID:热点名字 *password:热点密码 *config:热点信息 */ config.hiddenSSID = true; config.preSharedKey = password; config.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN); config.allowedProtocols.set(WifiConfiguration.Protocol.RSN); config.allowedProtocols.set(WifiConfiguration.Protocol.WPA); config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); config.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);

使用上面创建的热点信息打开热点

//config:热点信息，打开热点 Method method1 = null; try { method1 = wifiManager.getClass().getMethod("setWifiApEnabled", WifiConfiguration.class, boolean.class); method1.invoke(wifiManager, config, true); } catch (Exception e) { e.printStackTrace(); } //判断热点是否处于打开状态： try { Method method = wifiManager.getClass().getMethod("isWifiApEnabled"); method.setAccessible(true); return (Boolean) method.invoke(wifiManager); } catch (NoSuchMethodException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } //关闭热点,先判断热点是否已被打开，是则关闭 if (isWifiApEnabled(wifiManager)) { Method method = wifiManager.getClass().getMethod("getWifiApConfiguration"); method.setAccessible(true); WifiConfiguration config = (WifiConfiguration) method.invoke(wifiManager); Method method2 =wifiManager.getClass() .getMethod("setWifiApEnabled",WifiConfiguration.class, boolean.class); method2.invoke(wifiManager, config, false); }

到了这里安卓的wifi使用就已完成了，包括了wifi跟热点两大部分，wifi部分主要包括扫描、配置、连接断开等，热点部分主要是配置热点信息并打开。