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POHow can I receive a notification when the device loses network connectivity?
 

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  1. POHow can I receive a notification when the device loses network connectivity?
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    <p>I know you can write code through which you can determine whether the device is connected to a network.</p> <p>But in my app what I want to do is get a notification if the device changes its state from 'network' to 'no network'. This would happen, for example, when the user travels into a tunnel and loses signal, etc. Or when on WiFi, the user goes out of range of the access point and no longer has access to the internet.</p> <p>Does the Android API provide something where you can register a listener so that you get notified every time there is a change in network state?</p> <p>I found this code and tried to use it, but it does not do anything. I don't get any notifications when the network state changes.</p> <pre><code>public class ConnectivityManager extends PhoneStateListener{ Activity activity; public ConnectivityManager(Activity a){ TelephonyManager telephonyManager = (TelephonyManager)a.getSystemService(Context.TELEPHONY_SERVICE); telephonyManager.listen(this, PhoneStateListener.LISTEN_DATA_CONNECTION_STATE); activity = a; } @Override public void onDataConnectionStateChanged(int state) { super.onDataConnectionStateChanged(state); switch (state) { case TelephonyManager.DATA_DISCONNECTED: new AlertDialog.Builder(activity). setCancelable(false). setTitle("Connection Manager"). setMessage("There is no network connection. Please connect to internet and start again."). setNeutralButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { System.exit(0); } }).create(); break; case TelephonyManager.DATA_CONNECTED: break; } } } </code></pre> <p>Also, I have added the appropriate permissions in AndroidManifest.xml:</p> <pre><code>&lt;uses-permission android:name="android.permission.INTERNET"&gt;&lt;/uses-permission&gt; &lt;uses-permission android:name="android.permission.READ_PHONE_STATE"&gt;&lt;/uses-permission&gt; &lt;uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"&gt;&lt;/uses-permission&gt; </code></pre>
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