cordova-android/framework/assets/js/network.js

com.phonegap.NetworkManagerProxy = function() {
    this.className = "com.phonegap.NetworkManager";
};
com.phonegap.NetworkManagerProxy.prototype.isAvailable = function() {
    return PhoneGap.exec(this.className, "isAvailable", []);
};
com.phonegap.NetworkManagerProxy.prototype.isWifiActive = function() {
    return PhoneGap.exec(this.className, "isWifiActive", []);
};
com.phonegap.NetworkManagerProxy.prototype.isReachable = function(uri) {
    return PhoneGap.exec(this.className, "isReachable", [uri]);
};
com.phonegap.NetworkManager = new com.phonegap.NetworkManagerProxy();

/**
 * This class contains information about any NetworkStatus.
 * @constructor
 */
function NetworkStatus() {
    this.code = null;
    this.message = "";
};

NetworkStatus.NOT_REACHABLE = 0;
NetworkStatus.REACHABLE_VIA_CARRIER_DATA_NETWORK = 1;
NetworkStatus.REACHABLE_VIA_WIFI_NETWORK = 2;

/**
 * This class provides access to device Network data (reachability).
 * @constructor
 */
function Network() {
    /**
     * The last known Network status.
	 * { hostName: string, ipAddress: string, 
		remoteHostStatus: int(0/1/2), internetConnectionStatus: int(0/1/2), localWiFiConnectionStatus: int (0/2) }
     */
	this.lastReachability = null;
};

/**
 * Called by the geolocation framework when the reachability status has changed.
 * @param {Reachibility} reachability The current reachability status.
 */
Network.prototype.updateReachability = function(reachability) {
    this.lastReachability = reachability;
};

/**
 * 
 * @param {Object} uri
 * @param {Function} win
 * @param {Object} options  (isIpAddress:boolean)
 */
Network.prototype.isReachable = function(uri, win, options) {
    var status = new NetworkStatus();
    if(com.phonegap.NetworkManager.isReachable(uri)) {
        if (com.phonegap.NetworkManager.isWifiActive()) {
            status.code = NetworkStatus.REACHABLE_VIA_WIFI_NETWORK;
        }
        else {
            status.code = NetworkStatus.REACHABLE_VIA_CARRIER_DATA_NETWORK;
        }
    }
    else {
        status.code = NetworkStatus.NOT_REACHABLE;
    }
  win(status);
};

PhoneGap.addConstructor(function() {
    if (typeof navigator.network == "undefined") navigator.network = new Network();
});