How to Detect and Handle Network Connectivity Changes in Android?

Monitoring Network Connectivity in Android

Problem:

How can you monitor changes in network connectivity on an Android device and capture network outage events?

Answer:

To capture network outage events in Android, follow these steps:

1. Create a Broadcast Receiver:

Create a new Java class that extends the BroadcastReceiver class:

<code class="java">public class ConnectionChangeReceiver extends BroadcastReceiver
{
  @Override
  public void onReceive( Context context, Intent intent )
  {
    // Network connectivity change handling code goes here
  }
}</code>

2. Register the Broadcast Receiver:

Add the following XML code to your AndroidManifest.xml file within the element:

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

3. Grant Permission:

Add the following permission to your AndroidManifest.xml file within the element:

<code class="xml"><uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission></code>

4. Handle Network Connectivity Changes:

Within the onReceive method of your ConnectionChangeReceiver class, you can handle network connectivity changes. For example, you can check the active and mobile network info using:

<code class="java">ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService( Context.CONNECTIVITY_SERVICE );
NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();
NetworkInfo mobNetInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE );</code>

Example Code:

<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 );
    if ( activeNetInfo != null )
    {
      Toast.makeText( context, "Active Network Type : " + activeNetInfo.getTypeName(), Toast.LENGTH_SHORT ).show();
    }
    if( mobNetInfo != null )
    {
      Toast.makeText( context, "Mobile Network Type : " + mobNetInfo.getTypeName(), Toast.LENGTH_SHORT ).show();
    }
  }
}</code>

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