CODEWITHSUNDEEP
android3gandroid-networkingtelephonymanager
Muhammad Naderi
Muhammad Naderi

Reputation: 3248

How to monitor network type and get notified if it changes

I'm trying to make an app to both show the state of the network type (2G, 3G, or 4G), which I have done by using TelephonyManager, and also notify the user whenever the network type changes. This is the part I have problem in, how can I monitor the network type and get notified whenever it changes?

Upvotes: 2

Views: 3267

Answers (3)

Muhammad Naderi
Muhammad Naderi

Reputation: 3248

After a while here is a working code:

under onCreate :

    TelephonyManager TelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
    TelephonyMgr.listen(new TeleListener(),
            PhoneStateListener.LISTEN_DATA_CONNECTION_STATE);

and as a class :

public class TeleListener extends PhoneStateListener {  
    public void onDataConnectionStateChanged (int state, int networkType){
        super.onDataConnectionStateChanged(state, networkType);  
   //Whatever you wanna do  
      }  
}

the method onDataConnectionStateChanged(int state, int networkType) gets triggered when either networkstype(2G,3G,4G) changes or the connection state (Connecting, disconnecting etc) changes

Upvotes: 0

hoomi
hoomi

Reputation: 1912

You would need something like this: (Remember this will only work on Android 4.2+)

    // It Only works on Android 4.2+
    TelephonyManager telephonyManager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
    telephonyManager.listen(new PhoneStateListener(){

        @Override
        public void onCellInfoChanged(List<CellInfo> cellInfo) {
            super.onCellInfoChanged(cellInfo);
            for (CellInfo ci : cellInfo) {
                if (ci instanceof CellInfoGsm) {
                    Log.d("TAG", "This has 2G");
                } else if (ci instanceof CellInfoLte) {
                    Log.d("TAG", "This has 4G");
                } else {
                    Log.d("TAG", "This has 3G");
                }
            }
        }


    }, PhoneStateListener.LISTEN_CELL_INFO);

You will also need the android.permission.READ_PHONE_STATE permission in your manifest.

Upvotes: 0

Breadbin
Breadbin

Reputation: 419

You should find your answer here for network changes http://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html

EDIT for mobile networks check out this answer.https://stackoverflow.com/a/21721139/1898809

And this post : https://stackoverflow.com/a/17341777/1898809

Upvotes: 1

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