Step 1: Write permission in your manifest file.

				
					<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE"/>
				
			

Step 2: create java class as a "NetworkManager" in your project.

				
					package com.vocsy.network;

import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.net.NetworkInfo;
import android.net.NetworkRequest;

import androidx.annotation.NonNull;

public class NetworkManager {

    private static Activity activity;
    private static OnMonitorListener listener;

    private static NetworkRequest networkRequest = new NetworkRequest.Builder()
            .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
            .addTransportType(NetworkCapabilities.TRANSPORT_CELLULAR)
            .build();

    private static ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(@NonNull Network network) {
            super.onAvailable(network);

            if (listener != null) {
                listener.onConnectivityChanged(true);
            }
        }

        @Override
        public void onLost(@NonNull Network network) {
            super.onLost(network);
            if (listener != null) {
                listener.onConnectivityChanged(false);
            }
        }

        @Override
        public void onCapabilitiesChanged(@NonNull Network network, @NonNull NetworkCapabilities networkCapabilities) {
            super.onCapabilitiesChanged(network, networkCapabilities);
            final boolean isWifiNetwork = networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED);
        }
    };

    public interface OnMonitorListener {
        void onConnectivityChanged(boolean isConnected);
    }

    public static void Monitoring(Activity activity, OnMonitorListener listener) {
        NetworkManager.activity = activity;
        NetworkManager.listener = listener;

        if (listener != null && !isConnected(activity)) {
            listener.onConnectivityChanged(isConnected(activity));
        }

        ConnectivityManager connectivityManager = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
            connectivityManager = (ConnectivityManager) activity.getSystemService(ConnectivityManager.class);
        }
        if (connectivityManager != null) {
            connectivityManager.requestNetwork(networkRequest, networkCallback);
        }
    }

    private static boolean isConnected(Context context) {
        NetworkInfo info = getNetworkInfo(context);
        return (info != null && info.isConnectedOrConnecting());
    }

    private static NetworkInfo getNetworkInfo(Context context) {
        try {
            ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
            return cm.getActiveNetworkInfo();
        } catch (Exception e) {
            System.out.println("CheckConnectivity Exception: " + e.getMessage());
            return null;
        }
    }

    public static boolean isConnectedToWifi(Context context) {
        NetworkInfo info = getNetworkInfo(context);
        return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI);
    }

    public static boolean isConnectedToMobile(Context context) {
        NetworkInfo info = getNetworkInfo(context);
        return (info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE);
    }
}

				
			

How to Use: Just write down below code in your java class.

				
					NetworkManager.Monitoring(YOUR_ACTIVITY.this, new NetworkManager.OnMonitorListener() {
            @Override
            public void onConnectivityChanged(boolean isConnected) {
                
				// apply your logic...
				
            }
        });