How can I create a broadcast receiver in Android to detect and handle both internet connectivity changes and sudden internet loss?

Managing Internet Connectivity Changes in Android: A Comprehensive Guide

In Android, detecting connectivity changes is crucial for applications that require reliable internet access. However, relying solely on connectivity changes can leave web-based apps vulnerable to sudden internet loss. This article explores a comprehensive solution to create a broadcast receiver that listens for internet connectivity changes.

Original Problem:

The provided code monitors connectivity changes but fails to detect sudden internet loss without changes in connectivity.

Solution:

To address this issue, we need to create a broadcast receiver that specifically listens for internet connectivity changes, disconnected from connectivity changes. Here's how:

Implementing the Broadcast Receiver:

Create a new class, NetworkChangeReceiver, that extends BroadcastReceiver. In this class, override the onReceive method to handle internet connectivity changes:

<code class="java">public class NetworkChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, final Intent intent) {
        // Check the connectivity status
        int status = NetworkUtil.getConnectivityStatusString(context);
        Log.e("Network reciever status", String.valueOf(status));
        // Perform actions based on connectivity status
        if (status == NetworkUtil.NETWORK_STATUS_NOT_CONNECTED) {
            // Handle no internet connectivity
            new ForceExitPause(context).execute();
        } else {
            // Handle internet connectivity restored
            new ResumeForceExitPause(context).execute();
        }
    }
}</code>

Creating Utility Methods:

Include a util class, NetworkUtil, to abstract the logic for determining connectivity status:

<code class="java">public class NetworkUtil {
    // Define connectivity types and status
    public static final int TYPE_WIFI = 1;
    public static final int TYPE_MOBILE = 2;
    public static final int TYPE_NOT_CONNECTED = 0;
    public static final int NETWORK_STATUS_NOT_CONNECTED = 0;
    public static final int NETWORK_STATUS_WIFI = 1;
    public static final int NETWORK_STATUS_MOBILE = 2;

    // Get connectivity status as an integer
    public static int getConnectivityStatus(Context context) {
        // Obtain the ConnectivityManager
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        // Get the active network
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();

        // Check if there is an active network
        if (activeNetwork != null) {
            // Check network type
            if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
                return TYPE_WIFI;
            } else if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) {
                return TYPE_MOBILE;
            }
        }

        // No active network, return no connectivity
        return TYPE_NOT_CONNECTED;
    }

    // Get connectivity status as a string (Wifi, Mobile, Not Connected)
    public static int getConnectivityStatusString(Context context) {
        int conn = getConnectivityStatus(context);
        int status = 0;
        // Map connectivity status to string
        switch (conn) {
            case TYPE_WIFI:
                status = NETWORK_STATUS_WIFI;
                break;
            case TYPE_MOBILE:
                status = NETWORK_STATUS_MOBILE;
                break;
            case TYPE_NOT_CONNECTED:
                status = NETWORK_STATUS_NOT_CONNECTED;
                break;
        }
        return status;
    }
}</code>

Updating the Manifest File:

Add the necessary permissions and declare the broadcast receiver in your AndroidManifest.xml file:

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

<receiver
    android:name="NetworkChangeReceiver"
    android:label="NetworkChangeReceiver" >
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
    </intent-filter>
</receiver></code>

With this comprehensive solution, your Android application can now monitor internet connectivity changes and handle them accordingly, ensuring a more reliable user experience.

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