Check network connection android

Question

In my application, which I test on emulator, I use the following code to check the network connection (WIFI):

    public boolean isOnline() {
    ConnectivityManager cm =
        (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    if (netInfo != null && netInfo.isConnectedOrConnecting()) {
        return true;
    }
    return false;
}

This method returns always true, even if I disable the wireless connection of my computer... Is this caused by the emulator or is it something else?

If this is not the right way to check network connection, how can I do that?

Answer 1

It's better to (1) pass in the context so that the every activity can invoke this functions, and (2) Make this function static:

 public boolean isNetworkOnline() {
    boolean status=false;
    try{
        ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo netInfo = cm.getNetworkInfo(0);
        if (netInfo != null && netInfo.getState()==NetworkInfo.State.CONNECTED) {
            status= true;
        }else {
            netInfo = cm.getNetworkInfo(1);
            if(netInfo!=null && netInfo.getState()==NetworkInfo.State.CONNECTED)
                status= true;
        }
    }catch(Exception e){
        e.printStackTrace();  
        return false;
    }
    return status;

    }  

Answer 2

To get getActiveNetworkInfo() to work you need to add the following to the manifest.

1. uses-permission android:name="android.permission.INTERNET"
 2. uses-permission
    android:name="android.permission.ACCESS_NETWORK_STATE"

better to use netInfo.isConnected() rather than netInfo.isConnectedOrConnecting

and also try this

Context.getSystemService(Context.CONNECTIVITY_SERVICE).getNetworkInfo(ConnectivityManager.TYPE_MOBILE)

or

Context.getSystemService(Context.CONNECTIVITY_SERVICE).requestRouteToHost(TYPE_WIFI, int hostAddress)