Android WiFi State Listener

Question

I am new to Android development. How can I set up a listener for WiFi connections/disconnections inside an Activity? It has to be inside of the Activity because I have UART connection set up in it and need to send the WiFi status information to UART Device. I have tried some things with BroadcastReceivers but failed. Here is my last try:

private BroadcastReceiver myWifiReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager connectivityManager = ((ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE));
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if(networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_WIFI){
            if(networkInfo.isConnected()){
                Log.d("WIFI", "CONNECTED");
            }else{
                Log.d("WIFI", "DISCONNECTED");
            }
        }
}};

I may also need some help on how to register the BroadcastReceiver, currently I'm doing this inside of the Activity's onResume:

this.registerReceiver(this.myWifiReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));

And in onPause:

this.unregisterReceiver(myWifiReceiver);

EDIT:

Thanks to Devunwired's answer I've achieved what I wanted, I'm posting the code for future reference.

private BroadcastReceiver myWifiReceiver = new BroadcastReceiver(){
    @Override
    public void onReceive(Context context, Intent intent) {
        SupplicantState newState = intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE);

        switch(newState){
            case ASSOCIATED:
                Log.d("WIFI", "CONNECTED");
                break;
            case DISCONNECTED:
                if(!disconnected){
                    Log.d("WIFI", "DISCONNECTED");
                    disconnected = true;
                }
        }
}};

I also moved the BroadcastReceiver registration to onStart (and consequently moved the unregistration to onStop), because onResume wasn't always called:

this.registerReceiver(this.myWifiReceiver, new IntentFilter(
        WifiManager.SUPPLICANT_STATE_CHANGED_ACTION));

Answer 1

Depending on what you mean by "connections/disconnections" you might not be observing the correct broadcast action. ConnectivityManager.CONNECTIVITY_ACTION triggers when a default connection is fully established or lost.

You might be more interested in WifiManager.SUPPLICANT_CONNECTION_CHANGE_ACTION or WifiManager.SUPPLICANT_STATE_CHANGED_ACTION, which trigger as the association state of the WiFi radio changes.

I have tried some things with BroadcastReceivers but failed

If the above actions don't satisfy your needs, I would encourage you to elaborate on the failures you are experiencing.