Checking internet connection in android studio

How to Check Internet Connection in Android with No Internet Connection Dialog?

Hello geeks, today we are going to learn that how we can add the functionality of Internet Alert to our application. You have definitely seen in almost all applications that when data is turned off or application is not able to get Internet then it pops up a message of “No Internet Connection” and then again it is connected to data is displays message as “Back Online’ or “Internet in connected”, we are going to implement the same in our application.

Goals/purposes of Internet Alert:

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• To inform the user that he/she is not connected to the network.
• To stop all internet-related activities or services in the application.

What we are going to build in this article?

Here, we will be creating a button. Whenever the user will press the button message of Internet Connectivity will be displayed. Note that we are going to implement this application using Java language. A sample video is given below to get an idea about what we are going to do in this article.

Step by Step Implementation

Step 1: Creating a new project

If you don’t know how to create a new project in Android Studio then you can refer to How to Create/Start a New Project in Android Studio?

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How To Check Internet Connection in Android Programmatically

In this tutorial, I will tell you how to find the availability of Internet Connection from your Android applications. This is a step-by-step Tutorial in the Java language. So, let’s learn How To Check Internet Connection in Android Studio programmatically .

How To Check Internet Connection in Android Programmatically:

1- So create a new Android Studio Project. Name it “CheckConnection”. Also, you can name it whatever you want. After the project builds you will have two files. MainActivity.kt and activity_main.xml.

2- After your project builds successfully. Then first come to your AndroidManifest.xml file. and add this permission.

Kotlin Check Internet Connection

activity_main.xml

3- Now come to your activity_main.xml file and change the default Constraint Layout to Relative Layout.

4- We will take a Button in our RelativeLayout. With match_parent width and wrap_content height. After adding some additional attributes our Button widget will be like this.

5- And our final activity_main file will look like this because we only have one button in our activity.

check internet connection android programmatically

MainActivity.java

6- Now. Come to your MainActivity.java file. And under the onCreate method initialize our Button widget.

7- Then. We will register an onClickListener on our Button.

8- Also inside our onClickListener method. We will create an object. Of ConnectivityManager class. We will use a System Service as well.

9- So here we add an if-else condition on our ConnectivityManager class object. Because we use the object to check if the Internet connection is available or not. Because if the connection would be available we will display our Toast message “Internet Available”.

10- And if the Internet is not available. We will display our Toast message “No Internet”.

11- So our final MainActivity.java file will look like this.

So, you can use this code anywhere in your program and learn how to programmatically check the availability of the Internet. You can use the code in an Alert Dialog for a better look don’t forget to add the Network State permission in your AndroidManifest.xml file. Since I have used Button but you can use any other widgets of your choice. This is all for this tutorial :). Comment your Views below. And if you have any suggestions. So ask me.

So, practice Android Studio checks internet connection using this example and it works fine to check internet connection in Android kotlin. Also, it checks internet connection for Both wifi and Data (3G,4G, etc).

OUTPUT

When. Internet Available.

Data Connection. Is Available.

When Internet turned Off.

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Android check internet connection

In this blog, I’ll show how to check internet connection in android programmatically. While we are developing a professional app, you may need to check internet available or not. For example, while you are calling APIs you may need to check internet connection several times in an app. In this example, we’ll learn how we can check internet connections any place and anywhere.

I’m going to create a demo application, This app will automatically detect the internet changes using an internet connection listener. For the demonstration, I’ll create a sample app that app will capable of continuously check internet connection with android. So let started.

Create Android Project

Let move to Android Studio, and create a fresh project with some default template. We are going to use java 1.8 stuff in our project so lets set java version in app build.gradle file

Add ACCESS_NETWORK_STATE permission in Manifest

For detecting network permission we required some permission so let open the AndroidManifest and add below permission.

Write a ConnectivityProvider interface

I’m going to write complete solution for check internet connection for pre and post LOLLIPOP devices solution in a single interface. Please have a look

Extend ConnectivityProvider interface

Now create a abstract class named ConnectivityProviderBaseImpl which extends ConnectivityProvider interface, like below

Write a actual implementation of ConnectivityProvider

Let’s create a NetWorkManger class

In this class we have one live data object which hold the internet state, It can be accessible threw out the application.

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Android Internet Connection Status with Examples

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.

Check Internet Connection Status

In android, we can determine the internet connection status easily by using getActiveNetworkInfo() method of ConnectivityManager object.

Following is the code snippet of using the ConnectivityManager class to know whether the internet connection is available or not.

ConnectivityManager cm = (ConnectivityManager)getApplicationContext().getSystemService(Context. CONNECTIVITY_SERVICE );
NetworkInfo nInfo = cm.getActiveNetworkInfo();
boolean connected = nInfo != null && nInfo.isAvailable() && nInfo.isConnected();

If you observe above code snippet, we used getActiveNetworkInfo() method of ConnectivityManager object to know whether internet connection available or not.

Determine the Type of Internet Connection

In android, we can easily determine the type of internet connection currently available i.e. either WI-FI or mobile data by using the getType() method of NetworkInfo object.

Following is the code snippet to get the type of internet connection in the android application.

ConnectivityManager cm = (ConnectivityManager)getApplicationContext().getSystemService(Context. CONNECTIVITY_SERVICE );
NetworkInfo nInfo = cm.getActiveNetworkInfo();
boolean isWiFi = nInfo.getType() == ConnectivityManager. TYPE_WIFI ;

If you observe above code snippet, we used getType() method of NetworkInfo object to know the type of internet connection.

Now we will see how to save files directly on the device’s internal memory and read the data files from device internal memory by using FileOutputStream and FileInputStream objects in android application with examples.

Android Internet Connection Example

Following is the example of checking whether the internet connection available or not using the android ConnectivityManager object.

Create a new android application using android studio and give names as InternalConnectionExample. In case if you are not aware of creating an app in android studio check this article Android Hello World App.

Once we create an application, open activity_main.xml file from \res\layout folder path and write the code like as shown below.

activity_main.xml

Now open your main activity file MainActivity.java from \java\com.tutlane.internalstorageexample path and write the code like as shown below

MainActivity.java

package com.tutlane.internetconnectionexample;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity <
@Override
protected void onCreate(Bundle savedInstanceState) <
super .onCreate(savedInstanceState);
setContentView(R.layout. activity_main );
Button btnStatus = (Button)findViewById(R.id. btnCheck );
btnStatus.setOnClickListener( new View.OnClickListener() <
@Override
public void onClick(View v) <
// Check for Internet Connection
if (isConnected()) <
Toast.makeText(getApplicationContext(), «Internet Connected» , Toast. LENGTH_SHORT ).show();
> else <
Toast.makeText(getApplicationContext(), «No Internet Connection» , Toast. LENGTH_SHORT ).show();
>
>
>);
>
public boolean isConnected() <
boolean connected = false ;
try <
ConnectivityManager cm = (ConnectivityManager)getApplicationContext().getSystemService(Context. CONNECTIVITY_SERVICE );
NetworkInfo nInfo = cm.getActiveNetworkInfo();
connected = nInfo != null && nInfo.isAvailable() && nInfo.isConnected();
return connected;
> catch (Exception e) <
Log.e( «Connectivity Exception» , e.getMessage());
>
return connected;
>
>

If you observe above code, we are getting the internet connection status by using ConnectivityManager object.

Now we need to acquire the permissions of INTERNET and ACCESS_NETWORK_STATE for our android application for that open AndroidManifest.xml file and add the permissions like as shown below.

AndroidManifest.xml

If you observe above example, we are getting the internet connection status and added required permissions in AndroidManifest.xml file.

Output of Android Internet Connection Example

When we run the above example in the android emulator we will get a result like as shown below.

If you observe the above result, When we click on the Check Internet Connection button it will fetch the status of internet connection whether the internet available not.

This is how we can check the internet connection status in android applications using the ConnectivityManager object based on our requirements.

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How to Check for Internet Connection in Android using Kotlin

In this tutorial, I’m going to show you how to check the internet connection in your Android app without using any 3rd party library.

Adding required dependencies

Go to your app-level build.gradle file and add the following dependency:

The Local Broadcast Manager will help us to track the changes of internet connection (e.g, from Wi-Fi to cellular, or from Wi-Fi to no connection)

Next, go to the AndroidManifest.xml and add the following permission:

Creating the NetworkMonitorUtil file

Create a new Kotlin file, and give it the name NetworkMonitorUtil.

Then, paste the following code inside:

Because some methods are deprecated in newer versions of Android we’re going to use two different ways to check the internet connection:

For devices with Android 9 (Pie) and above we use NetworkCallback, which has methods to detect when the network is available or not and what type is (Wifi, Cellular e.t.c).

And for devices with Android 8 (Oreo) and below, we use the method CONNECTIVITY_ACTION combine with LocalBroadcastManager to run the code whenever the network state changes.

Using NetworkMonitorUtil

To use the NetworkMonitorUtil, first, you have to initialize it and register the LocalBroadcastManager/NetworkCallback in the onResume() method:

To get the state of the internet connection, use result:

Note: If you have to do changes in the UI, your code needs to be inside a runOnUiThread

And to stop monitoring, unregister the LocalBroadcastManager/NetworkCallback in the onStop() method:

If you have any questions, please feel free to leave a comment below

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