Check whether device is receiving data or not always while app is running...

MainActivity.java

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.coordinatorlayout.widget.CoordinatorLayout;

import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkRequest;
import android.os.Build;
import android.os.Bundle;

import com.google.android.material.snackbar.Snackbar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    CoordinatorLayout coordinatorLayout;
    ConnectivityManager connectivityManager;
    ConnectivityManager.NetworkCallback networkCallback;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        coordinatorLayout = findViewById(R.id.coordinator_layout);
        connectivityManager = (ConnectivityManager) getApplicationContext()
                .getSystemService(CONNECTIVITY_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            NetworkRequest networkRequest = new NetworkRequest.Builder().build();
            networkCallback = new ConnectivityManager.NetworkCallback() {

                @Override
                public void onAvailable(@NonNull Network network) {
                    // When Network connection is back
                    if (isInternetAccessAvailable()) {
                        Snackbar mySnackbar = Snackbar.make(coordinatorLayout,
                                "Connected",
                                Snackbar.LENGTH_LONG).setBackgroundTint(getResources()
                                .getColor(R.color.green));
                        mySnackbar.show();
                    } else if (!isInternetAccessAvailable()){
                        Snackbar mySnackbar = Snackbar.make(coordinatorLayout,
                                "No Internet Access",
                                Snackbar.LENGTH_INDEFINITE)
                                .setBackgroundTint(getResources().getColor(R.color.red));
                        mySnackbar.show();
                    }
                }

                @Override
                public void onLost(@NonNull Network network) {
                    // Called when the framework has a hard loss of the network or when the graceful
                    // failure ends.
                    if (isInternetAccessAvailable()) {
                        Snackbar mySnackbar = Snackbar.make(coordinatorLayout,
                                "Connected",
                                Snackbar.LENGTH_LONG).setBackgroundTint(getResources()
                                .getColor(R.color.green));
                        mySnackbar.show();
                    } else if (!isInternetAccessAvailable()){
                        Snackbar mySnackbar = Snackbar.make(coordinatorLayout,
                                "No Internet Access",
                                Snackbar.LENGTH_INDEFINITE)
                                .setBackgroundTint(getResources().getColor(R.color.red));
                        mySnackbar.show();
                    }
                }
            };
            // Register Callback and network request
            connectivityManager.registerNetworkCallback(networkRequest, networkCallback);
        }
    }

    public boolean isInternetAccessAvailable() {
        if (!isConnectedToThisServer("8.8.8.8")) {
            return isConnectedToThisServer("180.76.76.76");
        } else {
            return true;
        }
    }

    public boolean isConnectedToThisServer(String host) {
        Runtime runtime = Runtime.getRuntime();
        try {
            Process ipProcess = runtime.exec("/system/bin/ping -c 1 " + host);
            int exitValue = ipProcess.waitFor();
            return (exitValue == 0);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return false;
    }

    @Override
    public void onStop() {
        // Unregister callback on closing activity
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            connectivityManager.unregisterNetworkCallback(networkCallback);
        }
        super.onStop();
    }
}