android判断phonegap是否联网且加载super.loadUrl网址

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setIntegerProperty("splashscreen", R.drawable.splash);
ConnectivityManager cwjManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo info = cwjManager.getActiveNetworkInfo();
if (info != null && info.isAvailable()){
super.loadUrl("http://www.xxx.com",4500);
}
else
{
super.loadUrl("file:///android_asset/www/error.html", 4500);
}
}

document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
checkConnection();
document.addEventListener("backbutton", eventBackButton, false); //返回键
//document.addEventListener("menubutton", eventMenuButton, false); //menu
}
function checkConnection() {
var networkState = navigator.network.connection.type;
if( networkState == Connection.NONE ) {
navigator.notification.confirm('请确认网络连接已经开启', showAlert , '提示', '确定');
return false;
}
}
function showAlert(button) {
if( button==1 ) {
navigator.app.exitApp();
}
return false;
}
function eventBackButton(){
navigator.notification.confirm('确认退出？', showConfirm, '退出软件', '确定,取消');
}
function showConfirm(button) {
if( button==1 ) {
document.removeEventListener("backbutton", eventBackButton, false); //注销返回键
navigator.app.exitApp();
}
}