Check internet connection in ANDROID [duplicate]

Question

Hello I have application based on data retrieved over internet...

How can I handle my app in case there is no connection available?

I can detect connection with

ConnectivityManager cm = (ConnectivityManager) 
getSystemService(this.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo().isConnectedOrConnecting();

It works fine... But how can I prevent Force Erros when I know there is no connection? I would like a message to be shown - something like: "Sorry! There is no internet connection available!" and not my application to crush...

Answer 1

 /**
   * Checks if the device has Internet connection.
   * 
   * @return <code>true</code> if the phone is connected to the Internet.
   */
  public static boolean hasConnection() {
    ConnectivityManager cm = (ConnectivityManager) MbridgeApp.getContext().getSystemService(
        Context.CONNECTIVITY_SERVICE);

    NetworkInfo wifiNetwork = cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
    if (wifiNetwork != null && wifiNetwork.isConnected()) {
      return true;
    }

    NetworkInfo mobileNetwork = cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    if (mobileNetwork != null && mobileNetwork.isConnected()) {
      return true;
    }

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnected()) {
      return true;
    }

    return false;
  }

Answer 2

getActiveNetworkInfo() may return null, so you will get a force close, but you can do that:

ConnectivityManager cm = (ConnectivityManager) 
getSystemService(this.CONNECTIVITY_SERVICE);
NetworkInfo ni = cm.getActiveNetworkInfo();
if (null == ni)
    return false;
return ni.isConnectedOrConnecting();

Then the check is simple:

if (networkAvailable()) // << your method from above
{
// Do stuff
}
else
{
   Toast.makeToast(yourcontext, "No network available", Toast.LENGTH_LONG).show();
}