How to Show Dialog box No Internet Connection in App in Android Studio Check Network Connection

Full tutorial is given below. Dear Viewer we are working hard to maintain this website. We doesn't want any think from you. Its just a humble request If you thinks that this posts helps you please share this post with your friends.

AndroidManifests.xml

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.usmtip.myapplication">

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

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

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

    <application

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/Theme.MyApplication">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

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

            </intent-filter>

        </activity>

    </application>

</manifest>

MainActivity.java

package com.usmtip.myapplication;

import android.content.Context;

import android.content.DialogInterface;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.os.Bundle;

import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        if (!isConnected()){

            new AlertDialog.Builder(this)

                    .setCancelable(false)

                    .setIcon(android.R.drawable.ic_dialog_alert)

                    .setTitle("Internet Connection Error")

                    .setMessage("Please Check Your Internet Connection\n  .Turn On WIFI\n  .Turn On Mobile Data\n  .Try Again Later")

                    .setPositiveButton("Close",  new DialogInterface.OnClickListener() {

                        @Override

                        public void onClick(DialogInterface dialog, int which) {

                            finish();

                        }

                    })

                    .show();

        }else {

            Toast.makeText(MainActivity.this,"Please Wait...!", Toast.LENGTH_LONG).show();

        }

    }

    public boolean isConnected(){

        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

        return networkInfo != null && networkInfo.isConnected();

    }

}