Check internet connection java android

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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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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Android Detect Internet Connection Status

Detecting internet connection status in your app is very easy and won’t take more than 5mins. In this article you will learn how to detect internet connection status manually and automatically. Using broadcast receiver, your app will be automatically notified when there is a change in network connection.

This provides easy way do any changes in the app like hiding few button (like WhatsApp hides send, upload icon when there is not internet), navigation user to another screen, or just show a Snackbar message.

VIDEO DEMO

Creating New Project

1. Create a new project in Android Studio from File ⇒ New Project. When it prompts you to select the default activity, select Blank Activity and proceed.

2. Create a class named ConnectivityReceiver.java and extend it from BroadcastReceiver. This is a receiver class which will be notified whenever there is change in network / internet connection.

3. Create another class named MyApplication.java and extend it from Application. This class will be called whenever app is launched. Here setConnectivityListener() method is used to initiate the connectivity listener.

4. Open AndroidManifest.xml and do the below changes.

> Add MyApplication to tag.

> Add ConnectivityReceiver as .

> Declare INTERNET and ACCESS_NETWORK_STATE permissions.

Broadcasting Internet Status to All Activities

Now we have all the setup ready. Let’s see how to notify an activity when the device is connected or disconnected from internet.

5. Open layout file main activity activity_main.xml add the below layout.

6. Open your MainActivity.java and do the below changes to receive the internet status.

> Register the connection change listener in onResume() method by calling MyApplication.getInstance().setConnectivityListener(this).

> Implement the activity from ConnectivityReceiver.ConnectivityReceiverListener which will override onNetworkConnectionChanged() method.

> onNetworkConnectionChanged() method will be triggered whenever device is connected / disconnected from internet. You need to take appropriate action here.

Follow the above same three steps in all other activities in which in you want to notify the internet status.

Run the project and try turning off / on wifi or mobile data. You can notice a Snackbar is shown with network connection status.

Hi there! I am Founder at androidhive and programming enthusiast. My skills includes Android, iOS, PHP, Ruby on Rails and lot more. If you have any idea that you would want me to develop? Let’s talk: [email protected]

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Due non-availability of Internet, I get fail message , need to store the data locally it as soon as valid internet connectivity is available then send data.How will i do it?

I tried your connectiondetector code but its returning true always and not going to else loop.could u please sort out the problem.i used your code as it is.

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its done now.actully the problem was from my side.i did not disabled my device internet connection instead it i was disabling it in my system.thanks a lot for such a nice tutorial

thanks, this tutorial is very helpful…

very helpful, thanks

hi ravi
i have aquestion, if u can help me im so thankful. i have an app that need access to internet in some activity but when the net speed is low all my activities run slowly .when i delete permission it works fine .what can i do :(( help me

Very nice and Simple tutorial. Thanks

I want to know i want to use without refreshing , how to validate internet connection meaning auto check internet connection.

ok men!! ok excelent! yeah

nice english, hihi

This is not giving correct response when im connected to the wifi which is not connected to the internet.

Excellent tutorial…Thanks ravi..

Nice tutorials. but it check only data enable or not in internal setting only,, not externally. that means when i transfer the data in host side it check the network status in that time

ConnectionDetector needs a return type to compile (I inserted “void”).

No, It doesn’t show. It only checks ON or OFF not for active state.

Thanks, this was a nice little tutorial and added a much needed notification to my app 🙂

this only works when you are connected to any network, but doesn’t work when you want to know if that network has internet connection

dude,Its check status only… but some time internet connected but no internet access…

Dude when ever i check it only returns true value.When i dont have internet then also it returns you have internet .

this is the best android tutorial website I’ve ever visited.. THANKS..

when we connected wifi even there is limited network. it shows internet is connected

I have a question regarding the process Android uses to determine internet connection. The case is this.

We have an Android USB stick that does not set the correct date/time when it starts. When we connect it to internet and set auto date/time, it is correctly synced at startup, and the network connection states that there is internet, and the name of the wifi or wired network.

Now, when we place a router in the wifi network configuration, the Android player states that there is no internet connection and the date/time is not set. However, browsing pages through a browser (Chrome) works fine, and so do RSS feeds. Syncing date/time does not work, although all NTP ports in the router have been opened. When we drop all access lists in the router, syncing works fine, so it must be one of these access rules, but there are too many to find the correct one.

Since Android states that there is no internet connection but browsing pages works fine, I assume that at startup, Android signals some (Google) URL to determine whether there is internet connection (most likely some functionality in the isConnectingToInternet() functionality in this tutorial), and that this particular signal is blocked for security reasons. Am I correct that if at startup Android determines that there is no internet connection, it stops any other functionality to attempt to work, since it flagged no internet to be available?

Does anyone here know what steps Android takes exactly to determine internet availability? What URL or port or combination of these that may be blocked by some routers?

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