Android: ConnectivityManager always returning null

Question

I always get a null pointer exception, even when I'm connected to the wifi on this piece of code:

       ConnectivityManager connectivityManager = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);
    Log.d("Problem", connectivityManager.getActiveNetworkInfo().toString());

My permissions are:

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.SEND_SMS" >
</uses-permission>
<uses-permission android:name="android.permission.RECEIVE_SMS" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_UPDATES" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CONNECTIVITY_CHANGE" />

What am I missing :/? I just need to know if when he's connected to a wifi spot and when this changes. But the connectivity manager always returns null on the ActiveNetworkInfo

Answer 1

use this to know that WIFI is connected or not .

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class Network {
private Context context;
private ConnectivityManager connManager;

public Network(Context ctx) {
    this.context = ctx;
}

public boolean getConnectivityStatus() {
    connManager = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo info = connManager.getActiveNetworkInfo();
    if (info != null)
        return info.isConnected(); // WIFI connected
    else
        return false; // no info object implies no connectivity
}

}

Answer 2

connectivityManager.getActiveNetworkInfo()

update:

return the current device's active network connect, if your device has only wifi and wifi is not opened, it always null.

suggestion register the action receive: ConnectivityManager.CONNECTIVITY_ACTION

when receive the action you can check the connect using follow code:

NetworkInfo network = mConnectivityManager.getActiveNetworkInfo();
        if (network != null) {
            boolean isConnectedOrConnecting =  network.isConnectedOrConnecting();
            ...
        }