Android wifi 使用与工具类

1.背景需求

根据客户需求，在Android系统的WIFI模块的基础上，对WIFI机能进行自定义开发。主要还是调用Android中WIFI相关的API，具体的实现过程后续会详细讲解。

2.开发流程

（1）注册WIFIBroadcastReceiver. WIFI的开关状态，连接状态等都是通过系统的广播通知的，我们需要WIFIBroadcastReceiver来接收WIFI的各种状态通知。 注册之前，先需要添加相关的权限，否则无法收到系统广播 //允许程序读写系统安全敏感的设置项 <permission android:name="android.permission.WRITE_SECURE_SETTINGS"/> //允许程序改变网络连接状态 <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" /> //改变WLAN状态的开关 <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" /> //获取网络信息状态 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> //获取使用Wi-Fi等WLAN无线网络 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 对于BroadcastReceiver的注册方式，可以有两种： ①动态注册（代码中实现） m_broadCastReceiver = SysMangerWIFIBroadcastReceiver.getInstance(); m_intentFilter = new IntentFilter(); m_intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION); m_intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); m_intentFilter.addAction(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION); m_intentFilter.addAction(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION); m_intentFilter.addAction(WifiClient.ACTION_WPS_PROGRESS_CHANGED); m_intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION); context.registerReceiver(m_broadCastReceiver, m_intentFilter); ②Manifest文件中注册 <receiver android:name=".SysMangerWIFIBroadcastReceiver" > <intent-filter> <action android:name="android.net.wifi.WIFI_STATE_CHANGED" /> <action android:name="android.net.conn.CONNECTIVITY_CHANGE" /> <action android:name="android.net.wifi.STATE_CHANGE" /> ...... </intent-filter> </receiver> （2）新建SysMangerWIFIBroadcastReceiver.java类继承BroadcastReceiver. 代码中接收WIFI通知，处理相关的事件。 public void onReceive(Context arg0, Intent arg1) { //get the status of wifi if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(arg1.getAction())) { int wifiState = arg1.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0); switch (wifiState) { case WifiManager.WIFI_STATE_DISABLED: //SysLog.out(TAG, "onReceive", "wifi disabled"); break； case WifiManager.WIFI_STATE_DISABLING: //SysLog.out(TAG, "onReceive", "wifi disabling"); break； case WifiManager.WIFI_STATE_ENABLED: //SysLog.out(TAG, "onReceive", "wifi enabled"); break； case WifiManager.WIFI_WIFI_STATE_ENABLING: //SysLog.out(TAG, "onReceive", "wifi enabling"); break； } //get the notification of pwd error if(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION.equals(arg1.getAction())){ int State = arg1.getIntExtra(WifiManager.EXTRA_SUPPLICANT_ERROR, 0); if(State==WifiManager.ERROR_AUTHENTICATING){ //SysLog.out(TAG,"onReceive" , "wificonnect failure(pwd error)"); } } //get the notification of wpsconnect if (WifiClient.ACTION_WPS_PROGRESS_CHANGED.equals(arg1.getAction())) { int status = arg1.getIntExtra( WifiClient.EXTRA_WPS_PROGRESS_STATE, -1); switch (status) { case WifiClient.WPS_PROGRESS_START_COMPLETION: //SysLog.out(TAG, "onReceive", "Wps Completion"); break; case WifiClient.WPS_PROGRESS_START_FAILURE: //SysLog.out(TAG, "onReceive", "Wps Start Failure"); break; case WifiClient.WPS_PROGRESS_START_SUCCESS: //SysLog.out(TAG, "onReceive", "Wps Start Success"); break; case WifiClient.WPS_PROGRESS_CANCEL_FAILURE: //SysLog.out(TAG, "onReceive", "Wps Cancel Failure"); break; } //get the notification of AP connected if (WifiManager.NETWORK_STATE_CHANGED_ACTION.equals(arg1.getAction())) { Parcelable parcelableExtra = arg1.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO); if (null != parcelableExtra) { NetworkInfo wifi = (NetworkInfo) parcelableExtra; if (wifi != null) { if (NetworkInfo.State.CONNECTED == wifi.getState()) { //SysLog.out(TAG, "onReceive", "wifi connected"); }else if(NetworkInfo.State.DISCONNECTING == wifi.getState()){ //SysLog.out(TAG, "onReceive", "wifi disconnecting"); }else if (NetworkInfo.State.DISCONNECTED == wifi.getState()) { //SysLog.out(TAG, "onReceive", "wifi disconnected"); }else if (NetworkInfo.State.CONNECTING == wifi.getState()) { //SysLog.out(TAG, "onReceive", "wifi connecting"); } } }

} 3.开发流程

上篇讲到注册相关的BroadcastReceiver以及通过BroadcastReceiver来获取WIFI的各种通知，本篇接着上一篇来解析WIFI开发的过程，现在我们需要新建操作WIFI的工具类SysManagerWIFIUtil.java. private SysManagerWIFIAdmin(Context context) { m_context = context; mWifiManager = (WifiManager) context .getSystemService(Context.WIFI_SERVICE); } public static SysManagerWIFIUtil getInstance(Context context) { if (null == m_instance) { SysLog.out(TAG, "SysManagerWIFIUtil getInstance", "create singleton instance"); synchronized (SysManagerWIFIUtil.class) { if (null == m_instance) { m_instance = new SysManagerWIFIUtil(context); } } } return m_instance; } public void openWifi() { if (!mWifiManager.isWifiEnabled()) { mWifiManager.setWifiEnabled(true); } } public void closeWifi() { if (mWifiManager.isWifiEnabled()) { mWifiManager.setWifiEnabled(false); } } public int checkState() { return mWifiManager.getWifiState(); } public WifiManager getWifiManager() { return mWifiManager; } public synchronized List<WifiConfiguration> getConfiguration() { // saved AP mWifiConfiguration = mWifiManager.getConfiguredNetworks(); return mWifiConfiguration; } public synchronized WifiInfo getConnectionInfo() { mWifiInfo = mWifiManager.getConnectionInfo(); // SysLog.out(TAG, "connect", "" + mWifiInfo.toString()); return mWifiInfo; } // connect savedAP public boolean connectConfiguration(int netid) { if (netid < -1) { return false; } SysLog.out(TAG, "SysManagerWIFIAdmin enableNetwork", "start"); boolean c = mWifiManager.enableNetwork(netid, true); return c; } public synchronized void saveConfiguration() { SysLog.out(TAG, "SysManagerWIFIAdmin saveConfiguration", "start"); mWifiManager.saveConfiguration(); } public synchronized void startScan() { SysLog.out(TAG, "SysManagerWIFIAdmin startScan", "start"); mWifiManager.startScan(); } public synchronized List<ScanResult> getWifiList() { // scaned AP mWifiList = mWifiManager.getScanResults(); return mWifiList; } public synchronized String getMacAddress() { if (mWifiManager.isWifiEnabled()) { mWifiInfo = mWifiManager.getConnectionInfo(); return (mWifiInfo == null) ? "NULL" : mWifiInfo.getMacAddress(); } return null; } public synchronized String getBSSID() { if (mWifiManager.isWifiEnabled()) { mWifiInfo = mWifiManager.getConnectionInfo(); return (mWifiInfo == null) ? "NULL" : mWifiInfo.getBSSID(); } return ""; } public synchronized String getSSID() { if (mWifiManager.isWifiEnabled()) { mWifiInfo = mWifiManager.getConnectionInfo(); return (mWifiInfo == null) ? "NULL" : mWifiInfo.getSSID(); } return ""; } public synchronized int getIPAddress() { if (mWifiManager.isWifiEnabled()) { mWifiInfo = mWifiManager.getConnectionInfo(); return (mWifiInfo == null) ? 0 : mWifiInfo.getIpAddress(); } return 0; } public synchronized int getNetworkId() { if (mWifiManager.isWifiEnabled()) { mWifiInfo = mWifiManager.getConnectionInfo(); return (mWifiInfo == null) ? 0 : mWifiInfo.getNetworkId(); } return 0; } public synchronized boolean deleteConfiguration(int netId) { SysLog.out(TAG, "SysManagerWIFIAdmin deleteConfiguration", "start"); boolean b = mWifiManager.removeNetwork(netId); return b; } public synchronized int addNetwork(String ssid, String passwd, int type, String bssid) { SysLog.out(TAG, "SysManagerWIFIAdmin addNetwork", "start"); int status = addNetwork(CreateWifiInfo(ssid, passwd, type, bssid)); return status; } // add net and connect private int addNetwork(WifiConfiguration wcg) { int wcgID = mWifiManager.addNetwork(wcg); SysLog.out(TAG, "SysManagerWIFIAdmin addNetwork(enableNetwork)", "start"+", netID = "+wcgID); boolean b = mWifiManager.enableNetwork(wcgID, true); getConnectionInfo(); return wcgID; } private WifiConfiguration CreateWifiInfo(String SSID, String Password, int Type, String BSSID) { WifiConfiguration config = new WifiConfiguration(); config.allowedAuthAlgorithms.clear(); config.allowedGroupCiphers.clear(); config.allowedKeyManagement.clear(); config.allowedPairwiseCiphers.clear(); config.allowedProtocols.clear(); config.SSID = toHexString(SSID.getBytes()); SysLog.out(TAG, "SysManagerWIFIAdmin addNetwork", "SSID="+config.SSID); if (null == BSSID) { } else { config.BSSID = BSSID; } if ((null != SSID)&&(null != BSSID)) { WifiConfiguration tempConfig = this.IsExsits(SSID,BSSID); if (tempConfig != null) { mWifiManager.removeNetwork(tempConfig.networkId); } } if (TYPE_NO_PASSWD == Type) // WIFICIPHER_NOPASS { config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE); } else if (TYPE_WEP == Type) { // WIFICIPHER_WEP config.hiddenSSID = true; int len = Password.length(); if ((len == 10 || len == 26 || len == 58) && Password.matches("[0-9A-Fa-f]*")) { config.wepKeys[0] = Password; } else { config.wepKeys[0] = '"' + Password + '"'; } 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); config.wepTxKeyIndex = 0; } else if (TYPE_WPA == Type) { // WIFICIPHER_WPA if (Password.matches("[0-9A-Fa-f]{64}")) { config.preSharedKey = Password; } else { config.preSharedKey = '"' + Password + '"'; } config.hiddenSSID = true; config.allowedAuthAlgorithms .set(WifiConfiguration.AuthAlgorithm.OPEN); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); config.allowedPairwiseCiphers .set(WifiConfiguration.PairwiseCipher.TKIP); config.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); config.allowedPairwiseCiphers .set(WifiConfiguration.PairwiseCipher.CCMP); config.status = WifiConfiguration.Status.ENABLED; } else { } return config; } public int isWifiContected(Context context) { ConnectivityManager connectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo wifiNetworkInfo = connectivityManager .getNetworkInfo(ConnectivityManager.TYPE_WIFI); if (wifiNetworkInfo.isConnected()) { return WIFI_CONNECTED; } else { return WIFI_CONNECT_FAILED; } } public WifiConfiguration IsExsits(String SSID,String BSSID) { List<WifiConfiguration> existingConfigs = mWifiManager .getConfiguredNetworks(); for (WifiConfiguration existingConfig : existingConfigs) { if (null != BSSID && (("\"" + SSID + "\"").equals(existingConfig.SSID))&&(BSSID.equals(existingConfig.BSSID))) { return existingConfig; } } return null; } public synchronized void disconnectWifi(int netId) { mWifiManager.disableNetwork(netId); if(netId == getNetworkId()){ mWifiManager.disconnect(); SysLog.out(TAG, "SysManagerWIFIAdmin disconnectWifi(netID)", "Ap is disconnect = "+netId); } }