public class WifiUtils {
    private Context mContext;
    private WifiManager mWifiManager;
    public WifiUtils(Context context) {
        mContext = context;
        mWifiManager = (WifiManager) context.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
    }
    public boolean isWifiEnabled() {
        return mWifiManager.isWifiEnabled();
    }
    public boolean startScan() {
        return mWifiManager.startScan();
    }
    public String getConnectedSsid() {
        return mWifiManager.getConnectionInfo().getSSID().replace("\"", "");
    }
    public List<ScanResult> getScanResults() {
        return mWifiManager.getScanResults();
    }
    public void setWifiEnabled(boolean enabled) {
        mWifiManager.setWifiEnabled(enabled);
    }
    public boolean connectWifiPws(String ssid, String pws) {
        mWifiManager.disableNetwork(mWifiManager.getConnectionInfo().getNetworkId());
        int netId = mWifiManager.addNetwork(getWifiConfig(ssid, pws, true));
        return mWifiManager.enableNetwork(netId, true);
    }
    public boolean connectWifiNoPws(String ssid) {
        mWifiManager.disableNetwork(mWifiManager.getConnectionInfo().getNetworkId());
        int netId = mWifiManager.addNetwork(getWifiConfig(ssid, "", false));
        return mWifiManager.enableNetwork(netId, true);
    }
    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) {
            mWifiManager.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;
    }
    private WifiConfiguration isExist(String ssid) {
        List<WifiConfiguration> configs = mWifiManager.getConfiguredNetworks();
        for (WifiConfiguration config : configs) {
            if (config.SSID.equals("\"" + ssid + "\"")) {
                return config;
            }
        }
        return null;
    }
    public boolean isWifiConnect() {
        ConnectivityManager connManager =
                (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
        return mWifi.isConnected();
    }
}