Android Check Internet Connection Tutorial

This is android check internet connection tutorial.

When we perform any network related operation like making HTTP request, then it is good to check internet or network connectivity. A device can have different types of networks like Wi-Fi or mobile network.

In android we can check internet connectivity using ConnectivityManager class. First we need to instantiate an object of ConnectivityManager class by calling getSystemService() method.

After this we can get information of all networks using getAllNetworkInfo() method. This method will return an array of NetworkInfo type.

Finally we will check connection status and show a message to user.

Below example will show you how to check internet connectivity in android

Android Check Internet Connection

To check network connectivity we have to add ACCESS_NETWORK_STATE permission in AndroidManifest.xml file.

AndroidManifest.xml

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

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

activity_main.xml

<LinearLayout 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" tools:context=".MainActivity"
    android:orientation="vertical"
    android:gravity="center">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Check Internet Connectivity"
        android:id="@+id/button"
        android:onClick="buttonAction"/>

</LinearLayout>

MainActivity.java

package thecrazyprogrammer.androidexample;

import android.app.Activity;
import android.content.Context;
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 button;

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

        button=(Button)findViewById(R.id.button);
    }

    public void buttonAction(View view) {

        //instantiate an object
        ConnectivityManager cm=(ConnectivityManager)getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);

        //get all networks information
        NetworkInfo networkInfo[]=cm.getAllNetworkInfo();

        int i;

        //checking internet connectivity
        for(i=0;i<networkInfo.length;++i){
            if(networkInfo[i].getState()==NetworkInfo.State.CONNECTED){
                Toast.makeText(getApplicationContext(),"Internet Connected",Toast.LENGTH_LONG).show();
                break;
            }
        }

        if(i==networkInfo.length){
            Toast.makeText(getApplicationContext(),"Internet Not Connected",Toast.LENGTH_LONG).show();
        }
    }
}

When Internet Connected

When Internet Not Connected

Comment below if you are facing any problem related to above android check internet connection tutorial.

Happy Coding!!

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