Android代码实例如何实现wifi连接

首先加入权限。

 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/> 

然后新建一个wifi工具类。

public class WifiUtils {
    private static WifiUtils utils = null;

    public WifiUtils(Context context){
        wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
    }

    public static WifiUtils getInstance(Context context){
        if (utils == null){
            synchronized (WifiUtils.class){
                if (utils == null){
                    utils = new WifiUtils(context);
                }
            }
        }
        return utils;
    }

    private WifiManager wifiManager;

    /**
     * wifi是否打开
     * @return
     */
    public boolean isWifiEnable(){
        boolean isEnable = false;
        if (wifiManager != null){
            if (wifiManager.isWifiEnabled()){
                isEnable = true;
            }
        }
        return isEnable;
    }

    /**
     * 打开WiFi
     */
    public void openWifi(){
        if (wifiManager != null && !isWifiEnable()){
            wifiManager.setWifiEnabled(true);
        }
    }

    /**
     * 关闭WiFi
     */
    public void closeWifi(){
        if (wifiManager != null && isWifiEnable()){
            wifiManager.setWifiEnabled(false);
        }
    }



    /**
     * 有密码连接
     * @param ssid
     * @param pws
     */
    public void connectWifiPws(String ssid, String pws){
        wifiManager.disableNetwork(wifiManager.getConnectionInfo().getNetworkId());
        int netId = wifiManager.addNetwork(getWifiConfig(ssid, pws, true));
        wifiManager.enableNetwork(netId, true);
    }

    /**
     * wifi设置
     * @param ssid
     * @param pws
     * @param isHasPws
     */
    private WifiConfiguration getWifiConfig(String ssid, String pws, boolean isHasPws){
        WifiConfiguration config = new WifiConfiguration();
        config.allowedAuthAlgorithms.clear();
        config.allowedGroupCiphers.clear();
        config.allowedKeyManagement.clear();
        config.allowedPairwiseCiphers.clear();
        config.allowedProtocols.clear();
        config.SSID = "\"" + ssid + "\"";

        WifiConfiguration tempConfig = isExist(ssid);
        if(tempConfig != null) {
            wifiManager.removeNetwork(tempConfig.networkId);
        }
        if (isHasPws){
            config.preSharedKey = "\""+pws+"\"";
            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 {
            config.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
        }
        return config;
    }

    /**
     * 得到配置好的网络连接
     * @param ssid
     * @return
     */
    private WifiConfiguration isExist(String ssid) {
        List<WifiConfiguration> configs = wifiManager.getConfiguredNetworks();
        for (WifiConfiguration config : configs) {
            if (config.SSID.equals("\""+ssid+"\"")) {
                return config;
            }
        }
        return null;
    }
} 

假设ssid和pw信息格式如下。

 private String mString = "ssid:123,pw:12332";
    private String  ssid;
    private String pw;
   private WifiUtils mWifiUtils; 

需使用正则表达式获取ssid和pw。

 Pattern p1= Pattern.compile("ssid:(\\w+),pw:");
        Matcher m1 = p1.matcher(mString);
        while(m1.find()){
            ssid= m1.group(1);
            Log.d(TAG,"ssid = " + ssid);
        }

        Pattern p2= Pattern.compile("pw:(\\w+)");
        Matcher m2 = p2.matcher(mString);
        while(m2.find()){
            pw  = m2.group(1);
            Log.d(TAG,"pw = " + pw);
        } 

最后调用connectWifiPws去连接wifi。

 mWifiUtils = WifiUtils.getInstance(this);
        mWifiUtils.openWifi();
        mWifiUtils.connectWifiPws(ssid,pw); 

参考链接：
JAVA 截取两段字符串中间的值
Android连接WiFi

本文地址：https://blog.csdn.net/sinat_24353711/article/details/107760760