phonegap 检查是否有网络

    @Override
    public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         super.setBooleanProperty("loadInWebView", true);  
          super.setIntegerProperty("splashscreen", R.drawable.a);
          ConnectivityManager cwjManager=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
          NetworkInfo info = cwjManager.getActiveNetworkInfo();
          if (info != null && info.isAvailable()){ //有网
          super.loadUrl("http://192.168.55.175:5000",10000);
          }else{//没有网
         super.loadUrl("file:///android_asset/www/error.html",2000);
          }
    }