How To Use Supplicant_state_changed_action Wifi Broadcastreceiver - Android

I want to show the connection process on the screen when my device is connecting to the wifi network. SUPPLICANT_STATE_CHANGED_ACTION is provided by WifiManager but i don't know ho

Solution 1:

You can indeed use the broadcasted intents for SUPPLICANT_STATE_CHANGED_ACTION:

The app needs the permission in its Manifest file:

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

Then register for the system broadcast:

MyWifiStateReceiverhandler=newMyWifiStateReceiver();
    context.registerReceiver(handler, newIntentFilter(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION));

the registerReceiver() needs an instance of a class implementing BroadcastReceiver as its first argument. In that code you can act on the Wifi state changes by overriding the onReceive method. For example

publicclassMyWifiStateReceiverextendsBroadcastReceiver
{
    @OverridepublicvoidonReceive(Context context, Intent intent)
    {
        if (intent.getAction().equals(WifiManager.SUPPLICANT_STATE_CHANGED_ACTION))
        {
            SupplicantStatestate= (SupplicantState) intent.getParcelableExtra(WifiManager.EXTRA_NEW_STATE);
            switch(state)
            {
                case COMPLETED:
                case DISCONNECTED:
                    ...
            }
        }
    }
}

For the possible Wifi state values, see http://developer.android.com/reference/android/net/wifi/SupplicantState.html

Solution 2:

I don't know of a callback method that lets you know when the wifi status has changed. I polled the information using a Handler running in the background.

Add the handler to your class.

privateWifiStatusHandlerwifiStatusHandler=newWifiStatusHandler();

Start it by calling

wifiStatusHandler.start();

The code I used is below.

/**
 * Checks for wifi status updates.
 */privateclassWifiStatusHandlerextendsHandler {
    privatebooleanrunning=false;

    publicvoidhandleMessage(Message message) {
        if (running) {
            //check wifi status hereWifiManagerwifiMgr= (WifiManager) getSystemService(Context.WIFI_SERVICE); 
            intcurWifiState= wifiMgr.getWifiState();
            SupplicantStateinfo= wifiMgr.getConnectionInfo().getSupplicantState();
            WifiInfocurWifi= wifiMgr.getConnectionInfo();
            Log.i(TAG,"WIFI STATE = " + info.toString());
            //update the TextView etc.
            sleep();
        }
    }

    privatevoidsleep() {
        removeMessages(0);
        sendMessageDelayed(obtainMessage(0), REFRESH_DELAY);
    }

    publicsynchronizedvoidstart() {
        running = true;
        removeMessages(0);
        sendMessageDelayed(obtainMessage(0), 0);
    }

    publicsynchronizedvoidstop() {
        running = false;
    }
}