How to get notified when the users Wifi changes from one network to other

Question

I have an app in which I need to detect users Wifi connection and based on that, the user can see some data. The point is that I want to get notified when the user was on some other network while starting the app and moves to some other network while the app was running. Let me make a scenario:

Suppose I have 2 wifi, one inside my house and other outside. When starting the app, I was inside the house and accordingly the data shown to me was "ABC". Now when I move outside the house, my app should give a notification and kill the activity and hence I should not be able to see the same data "ABC" when I am outside the house.

possible duplicate of [How to be notified on wifi network status change?](http://stackoverflow.com/questions/3119607/how-to-be-notified-on-wifi-network-status-change) — flx, Feb 26 '14 at 04:53
hi akshat a code snippet is at answer please have a look, hope it will help you!! — Jitesh Upadhyay, Feb 26 '14 at 05:16

Lucifer · Answer 1 · 2014-02-26T05:15:34.013

Each time the user changes the connection you can catch in BroadcastReceiver.

First of all you require to declare following permissions in AndroidManifest.xml

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

Create a BroadcastReceiver

public class BrodcastNetwork extends BroadcastReceiver 
{
      @Override
      public void onReceive(Context context, Intent intent) 
      {
              // Write your code here
      }
}

Apply the filters to BroadcastReceiver

  <receiver android:name="com.example.datausage.BrodcastNetwork" >
      <intent-filter>
          <action android:name="android.net.conn.CONNECTIVITY_CHANGE" >
          </action>
      </intent-filter>
  </receiver>

score 1 · Accepted Answer · edited Feb 26 '14 at 07:32

1

Write a BroadcastReceiver as follows

public class TheBroadcastReceiver extends BroadcastReceiver 
{
    @Override
    public void onReceive(Context context, Intent intent) 
    {
        WifiManager wifiManager = (WifiManager) context
                .getSystemService(Context.WIFI_SERVICE);
        NetworkInfo datainfo = intent
                .getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
        if (datainfo != null) 
        {
            if (datainfo.getType() == ConnectivityManager.TYPE_WIFI) 
            {
                //have different network states here
                if (datainfo.getState() == datainfo.State.CONNECTING || datainfo.getState() == datainfo.State.CONNECTED) {
                    //work accordingly
                }
            }
        }
    }
}

Register a BroadcastReceiver and register these entries at manifest

    <receiver android:name="yours package details like com.a.b.c.TheBroadcastReceiver " >
          <intent-filter>
               <action android:name="android.net.wifi.supplicant.CONNECTION_CHANGE" />
               <action android:name="android.net.wifi.STATE_CHANGE" />
           </intent-filter>
   </receiver>

Add following permission sets at manifest

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

Also visit http://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html

edited Feb 26 '14 at 07:32

Lucifer

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answered Feb 26 '14 at 05:14

Jitesh Upadhyay

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Hi Jitesh, thanx for the help but can you tell me where I will be notified that the Wifi has been changed. I mean suppose I am on wifi named "Inside", and I move to "Outside", can you please tell me where to write the code to toast a message like "Wifi has been changed from "Inside" to "Outside"." – Feb 26 '14 at 05:20
hi i wrote a comment on given code as //work accordingly..there you need to work accordingly – Jitesh Upadhyay Feb 26 '14 at 05:21
And what is the section in which there is "//have different network states here".? What network states does it mean.? – Feb 26 '14 at 05:30
as you can see there is a if checking after it and it is anside after checking for wifi state ConnectivityManager.TYPE_WIFI!! – Jitesh Upadhyay Feb 26 '14 at 05:31
basically you are getting different network states after that comment, please see the code – Jitesh Upadhyay Feb 26 '14 at 05:32
@Kedarnath thankyou for editing and pointing it correctly. i added you on g talk as you have given mail id at yours profile – Jitesh Upadhyay Feb 26 '14 at 07:46
@JiteshUpadhyay ok, will talk with you in evening time. – Lucifer Feb 26 '14 at 07:58

score 0 · Answer 3 · answered Feb 26 '14 at 04:53

0

Register a broadcast receiver to listen for the Action "android.net.ConnectivityManager.CONNECTIVITY_ACTION"
When connection changed to "connected" state, call WifiManager.getConnectionInfo().getBSSID() to check the current access point ID

answered Feb 26 '14 at 04:53

Robin

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How to get notified when the users Wifi changes from one network to other

3 Answers3