How to Detect Network Connectivity Changes in Android?

Implementing Network Listener in Android

Question:

Can we monitor network connectivity changes on an Android device and capture events when the network goes offline?

Answer:

Yes, it is possible to listen for network connectivity changes in Android. Here's a detailed implementation:

1. Create a Broadcast Receiver:

<code class="java">public class ConnectionChangeReceiver extends BroadcastReceiver {
  ...
  @Override
  public void onReceive(Context context, Intent intent) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
    NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
    // Check for active network and mobile network changes
    ...
  }
  ...
}</code>

2. Declare Permission:

<code class="xml"><!-- Required to monitor network connectivity changes -->
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /></code>

3. Register Receiver in AndroidManifest.xml:

<code class="xml"><receiver android:name="com.blackboard.androidtest.receiver.ConnectionChangeReceiver"
          android:label="NetworkConnection">
  <intent-filter>
    <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
  </intent-filter>
</receiver></code>

Explanation:

The broadcast receiver registers itself to listen for "CONNECTIVITY_CHANGE" broadcasts from the system. When the network status changes, the onReceive() method is triggered, and the receiver can check the current network state and respond accordingly.

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