registerReceiver returns null for SCAN_RESULTS_AVAILABLE_ACTION

Question

I'm trying to get the available Wifi list.

I have a separate class that holds the receiver.

public  BroadcastReceiver WifiScanBroadcast = new BroadcastReceiver(){
    public void onReceive(Context context, android.content.Intent intent) 
    {
        results = wifiManager.getScanResults();
        size = results.size();
    };

I have instantiated the class with the variable wifiManager. Thats the onCreate function of my Activity:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_wifi_list);
    wifiManager = new WifiApManager(this);

    Intent i = registerReceiver(wifiManager.WifiScanBroadcast, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));


}

This is what i use in the manifest:

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />

When I'm getting to the registerReceiver, it returns Null. What is wrong?

Answer 1

I didn't really get what was wrong with my code, but moving to receiver to the activity(in the past the receiver was declared in another class) solved the problem. Now it works