how to check internet connection in android programmatically

how to check internet connection in android programmatically

In this Article today learn how to check internet connection in android programmatically. In android, by using the ConnectivityManager class we can easily determine whether the device connected to the network/internet or not and also we can determine the type of internet connection currently available i.e. whether it’s mobile data or Wi-Fi.

To get the internet connection status, our app must acquire the INTERNET and ACCESS_NETWORK_STATE permissions. For that, we need to add the following permissions in the android manifest file like as shown below.

Follow the method of how to check internet connection in android programmatically:

Follow the change in Mainactvity.java:

btnNetworkcheck.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

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

                NetworkInfo networkInfo=ConnectionManager.getActiveNetworkInfo();

                if(networkInfo != null && networkInfo.isConnected()==true )

                {

                    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);

                    alertDialogBuilder.setMessage("Internet Available");

                            alertDialogBuilder.setPositiveButton("OK",

                                    new DialogInterface.OnClickListener() {

                                        @Override

                                        public void onClick(DialogInterface arg0, int arg1) {

                                        }

                                    });

                    AlertDialog alertDialog = alertDialogBuilder.create();

                    alertDialog.show();

                }

                else

                {

                    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);

                    alertDialogBuilder.setMessage("Internet Not Available");

                    alertDialogBuilder.setPositiveButton("OK",

                            new DialogInterface.OnClickListener() {

                                @Override

                                public void onClick(DialogInterface arg0, int arg1) {

                                }

                            });

                    AlertDialog alertDialog = alertDialogBuilder.create();

                    alertDialog.show();

                }

            }

        });

And  follow change in AndroidManifest.xml:

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

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

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

Follow the full Source code how to check internet connection in android programmatically in android Studio.

1.MainActivity.java:

package com.akash.checkinternetconnection;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.content.DialogInterface;

import android.net.ConnectivityManager;

import android.net.NetworkInfo;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

    Button btnNetworkcheck;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btnNetworkcheck = (Button)findViewById(R.id.button1);

        btnNetworkcheck.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

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

                NetworkInfo networkInfo=ConnectionManager.getActiveNetworkInfo();

                if(networkInfo != null && networkInfo.isConnected()==true )

                {

                    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);

                    alertDialogBuilder.setMessage("Internet Available");

                            alertDialogBuilder.setPositiveButton("OK",

                                    new DialogInterface.OnClickListener() {

                                        @Override

                                        public void onClick(DialogInterface arg0, int arg1) {

                                        }

                                    });

                    AlertDialog alertDialog = alertDialogBuilder.create();

                    alertDialog.show();

                }

                else

                {

                    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);

                    alertDialogBuilder.setMessage("Internet Not Available");

                    alertDialogBuilder.setPositiveButton("OK",

                            new DialogInterface.OnClickListener() {

                                @Override

                                public void onClick(DialogInterface arg0, int arg1) {

                                }

                            });

                    AlertDialog alertDialog = alertDialogBuilder.create();

                    alertDialog.show();

                }

            }

        });

    }

}

2.activity_main.xml:

<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=".MainActivity" >

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="158dp"

        android:text="CLICK HERE TO CHECK INTERNET CONNECTION STATUS" />

</RelativeLayout>

3.AndroidManifest.xml:

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

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

    package="com.akash.checkinternetconnection">

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

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

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

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <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>

4.dimens.xml:

<resources>

    <!-- Default screen margins, per the Android Design guidelines. -->

    <dimen name="activity_horizontal_margin">16dp</dimen>

    <dimen name="activity_vertical_margin">16dp</dimen>

    <dimen name="nav_header_vertical_spacing">8dp</dimen>

    <dimen name="nav_header_height">176dp</dimen>

    <dimen name="fab_margin">16dp</dimen>

</resources>

5.Output: