Check Internet Connection Using Broadcast Receiver Continuously in Android Studio 2021

In this blog, I'm going to create how we can check internet connection continuously with the help of a Broadcast receiver in the android studio 
so let's start

1. Create a new Android Studio Project

2.Follow my Tutorials to implement the XML part.

   

Here is the activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="check"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

Here is the custom_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical">


    <com.airbnb.lottie.LottieAnimationView
        android:layout_width="match_parent"
        android:layout_height="500dp"
        app:lottie_autoPlay="true"
        app:lottie_loop="true"
        app:lottie_rawRes="@raw/internet_no" />


    <Button
        android:id="@+id/retry"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="32dp"
        android:text="retry" />

</LinearLayout>

2.Create NetworkUtil.java File and add this code

package com.example.checkconnection;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class NetworkUtil {


    public static String getNetworkState(Context context) {
        String status = null;
        ConnectivityManager connectivityManager =
                (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        if (networkInfo != null) {

            if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
                status = "Wifi connected";
                return status;
            } else if (networkInfo.getType() == ConnectivityManager.TYPE_MOBILE) {
                status = "Mobile data  connected";
                return status;
            }


        } else {
            status = "No internet";
            return status;
        }

        return status;
    }
}

3.Create InternetCheckService.java File and add this code

package com.example.checkconnection;

import android.app.Activity;
import android.app.Dialog;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Button;
import android.widget.Toast;

public class InternetCheckService extends BroadcastReceiver {


    @Override
    public void onReceive(Context context, Intent intent) {
        String status = NetworkUtil.getNetworkState(context);
        Dialog dialog = new Dialog(context,
                android.R.style.Theme_NoTitleBar_Fullscreen);
        dialog.setContentView(R.layout.custom_dialog);
        Button rettry = dialog.findViewById(R.id.retry);

        rettry.setOnClickListener(v -> {
            ((Activity) context).finish();
            Intent intent1 = new Intent(context, MainActivity.class);
            context.startActivity(intent1);
        });


        if (status.isEmpty() || status.equals("No internet")) {
            dialog.show();
        }


        Toast.makeText(context, status, Toast.LENGTH_SHORT).show();


    }
}

4.Now Add code in MainActivity.java 

package com.example.checkconnection;

import android.content.BroadcastReceiver;
import android.content.IntentFilter;
import android.net.ConnectivityManager;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    BroadcastReceiver broadcastReceiver = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        broadcastReceiver = new InternetCheckService();
        checkInternet();

    }

    private void checkInternet() {
        registerReceiver(broadcastReceiver,
                new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    }

    @Override
    protected void onPause() {
        super.onPause();
        unregisterReceiver(broadcastReceiver);
    }
}

4.Now Open AndroidManifest File and add permission

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

And also add this line in <application> here paste the code </application>

<receiver android:name=".InternetCheckService">
    <intent-filter>
        <action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE"
            tools:ignore="BatteryLife" />
    </intent-filter>
</receiver>

Follow my Video Tutorials