How to Check Internet Connection in Android Studio - No Internet Connection Dialog Android Studio

 

In this blog, I'm going to create how we can check internet connection on Button click in the android studio
so let's start

1. we need to add a button in 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_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    
</androidx.constraintlayout.widget.ConstraintLayout>

2. Now add this code to your MainActivity.class

package com.example.checkconnection;

import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.provider.Settings;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    Button button;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = findViewById(R.id.check);
        button.setOnClickListener(v -> {
            if (connected()) {
                //do your task
                Toast.makeText(this, "internet connected",
                        Toast.LENGTH_SHORT).show();
            } else {
                shoowCustomDialog();
                Toast.makeText(this, "internet not connected",
                        Toast.LENGTH_SHORT).show();
            }
        });
    }
    private void shoowCustomDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setMessage("please connect to the internet to proceed")
                .setCancelable(false)
                .setPositiveButton("connect", ((dialog, which) -> {
                    startActivity(new Intent(Settings.ACTION_WIFI_SETTINGS));
                })).show();
    }
    private boolean connected() {
        ConnectivityManager cm = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        return networkInfo != null;
    }
}

3. add this permission in your AndroidManifest

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

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