Check Internet Connection using Broadcast Receiver in Android

activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.chantisandroid.checkinternetconnection.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Welcome to ChantisAndroid"
        android:id="@+id/textView"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />
</RelativeLayout>


internet_screen.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:descendantFocusability="beforeDescendants"
    android:focusableInTouchMode="true"
    android:background="@android:color/white" >

    <TextView
        android:id="@+id/textView1"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="35dp"
        android:textSize="25dp"
        android:textColor="@android:color/holo_red_dark"
        android:text="Oops! No Internet Connection"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <ImageView
        android:id="@+id/tapretry1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:src="@drawable/errordownload"   //you can download image for no Internet                                                                            and paste to drawable under res folder
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />


</RelativeLayout>


MainActivity.java:
package com.chantisandroid.checkinternetconnection;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity implements ConnectivityReceiver.ConnectivityReceiverListener {

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

        checkConnection();
    }

    private void checkConnection() {
        boolean isConnected = ConnectivityReceiver.isConnected();
        showSnack(isConnected);
    }

    private void showSnack(boolean isConnected) {
        if (isConnected) {
            setContentView(R.layout.activity_main);

        } else {
            setContentView(R.layout.internet_screen);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        MyApplication.getInstance().setConnectivityListener(this);
    }

    @Override
    public void onNetworkConnectionChanged(boolean isConnected) {
        showSnack(isConnected);
    }

}


ConnectivityReceiver.java:
package com.chantisandroid.checkinternetconnection;

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

public class ConnectivityReceiver extends BroadcastReceiver {

    public static ConnectivityReceiverListener connectivityReceiverListener;
    public ConnectivityReceiver() {
        super();
    }

    @Override
    public void onReceive(Context context, Intent arg1) {
        ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();

        if (connectivityReceiverListener != null) {
            connectivityReceiverListener.onNetworkConnectionChanged(isConnected);
        }
    }

    public static boolean isConnected() {
        ConnectivityManager cm = (ConnectivityManager) MyApplication.getInstance().getApplicationContext()
                .getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
        return activeNetwork != null && activeNetwork.isConnectedOrConnecting();
    }
    public interface ConnectivityReceiverListener {
        void onNetworkConnectionChanged(boolean isConnected);
    }

}


MyApplication.java:
package com.chantisandroid.checkinternetconnection;

import android.app.Application;

public class MyApplication extends Application {

    private static MyApplication mInstance;

    @Override
    public void onCreate() {
        super.onCreate();

        mInstance = this;
    }

    public static synchronized MyApplication getInstance() {
        return mInstance;
    }

    public void setConnectivityListener(ConnectivityReceiver.ConnectivityReceiverListener listener) {
        ConnectivityReceiver.connectivityReceiverListener = listener;
    }

}


AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.chantisandroid.checkinternetconnection">

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

    <application
        android:name=".MyApplication"
        android:allowBackup="true"
        android:fullBackupContent="true"
        android:hardwareAccelerated="false"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:largeHeap="true"
        android:supportsRtl="true"
        android:theme="@style/AppTheme"
        tools:ignore="GoogleAppIndexingWarning">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name=".ConnectivityReceiver"
            android:enabled="true">
            <intent-filter>
                <action
                    android:name="android.net.conn.CONNECTIVITY_CHANGE"
                    tools:ignore="BatteryLife" />
            </intent-filter>
        </receiver>

    </application>


</manifest>