Check if you have internet connection android

Android Internet Connection Status & Network Change Receiver example

by Viral Patel · April 26, 2013

If you are developing an Android app you may already fetching information from internet. While doing so there is a chance that internet connection is not available on users handset. Hence its always a good idea to check the network state before performing any task that requires internet connection. You might also want to check what kind of internet connection is available in handset. For example is wifi currently enabled? or is mobile data network is connected.

Check Internet Connection

Here is a simple code snippet that will help you identify what kind of internet connection a user has on her device. First we need following permission in order to access network state. Add following permission to your AndroidManifest.xml file. Permissions required to access network state:

Now check following utility class NetworkUtil . It has method getConnectivityStatus which returns an int constant depending on current network connection. If wifi is enabled, this method will return TYPE_WIFI . Similarly for mobile data network is returns TYPE_MOBILE . You got the idea!! There is also method getConnectivityStatusString which returns current network state as a more readable string.NetworkUtil.java

You can use this utility class in your android app to check the network state of the device at any moment. Now this code will return you the current network state whenever the utility method is called. What if you want to do something in your android app when network state changes? Lets say when Wifi is disabled, you need to put your android app service to sleep so that it does not perform certain task. Now this is just one usecase. The idea is to create a hook which gets called whenever network state changes. And you can write your custom code in this hook to handle the change in network state.

Broadcast Receiver to handle changes in Network state

You can easily handle the changes in network state by creating your own Broadcast Receiver. Following is a broadcast receiver class where we handle the changes in network. Check onReceive() method. This method will be called when state of network changes. Here we are just creating a Toast message and displaying current network state. You can write your custom code in here to handle changes in connection state.NetworkChangeReceiver.java

Once we define our BroadcastReceiver, we need to define the same in AndroidMenifest.xml file. Add following to your menifest file.

We defined our broadcast receiver class in menifest file. Also we defined two intent CONNECTIVITY_CHANGE and WIFI_STATE_CHANGED . Thus this will register our receiver for given intents. Whenever there is change in network state, android will fire these intents and our broadcast receiver will be called. Below is complete AndroidMenifest.xml file. AndroidMenifest.xml

Run this demo in android emulator or actual device. When Wifi is enabled, you’ll see a Toast message with message.

Now disable Wifi. The toast message will show you message that internet connection is not available.

Now enable mobile data network. The same will be show in toast message as soon as you enable mobile data connection.

Download Source Code

Browse through the source code in following Git repository:

Источник

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.

Источник

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.

Источник

Implementing Internet Connectivity Checker in Android Apps

Dec 31, 2020 · 4 min read

W orking on an Android chat app? social media app? or any other internet-based app that you want to check if there is an internet connection in order to continue a process or even notify the user about their network state? This guide comes to the rescue!

You may say: “ Hey! There is already an API which gets this job done.”

Yes, there is! Well, although Android SD K provides API that you can use to get network state of user’s device like ConnectivityManager, it does not actually check whether there is an active internet connection. Concretely, try establishing a hotspot from mobile device “A” but do not turn on mobile data or WiFi, then connect mobile device “B” to that hotspot of “A”.

Using device “B”, when you try to search, say, on Google this won’t work as there is no internet connection although you are connected to a network. ConnectivityManager APIs work the same. They just tell whether you are connected to a network or not — regardless of having an active internet connection or not.

So, the bottom line is:

“How do we check if there is an active internet connection?”

Basically, we can ping or connect to any server to see whether this ping or connection is successful or not.
If you have your own back-end server, you may prefer to try to connect your app to the server to make sure that the device has an internet connection and your server is not down at the same time.
We can also connect to Google’s servers as they are unlikely to be down (or for a long time).
To optimize our class implementation (we’ll call it NetworkConnectivity), it’s good to check a device’s network connection using ConnectivityManager so that if WiFi or mobile data is turned off or even WiFi is turned on but there is no network the device is connected to, we don’t have to make requests to any servers.

Enough talk!

First of all, add internet and network state permissions in your app manifest:

Now, create a function to check network availability using ConnectivityManager:

Here we used getAllNetworkInfo() to return an array of objects of all networks and then we check whether any of them is connected.
But this method is deprecated since API 23. For later APIs, we used getAllNetworks() which is added in API 21. But yea, getNetworkInfo() is also deprecated since API 29 🙂

Back to our business

To ping Google’s server, basically, we can do that with a few lines of code:

This approach works synchronously so that you just wait for the response to tell whether you have a connection or not and it takes no time. However, in some mobile devices for specific brands, the framework does not allow performing this process in Runtime, so you can not eventually rely on it.
Instead, we can make a normal HTTP connection request to the server.

Start by creating a method called checkInternetConnection which checks first if WiFi or mobile data are connected to any network by using the above method. Then it starts establishing an HTTP URL connection:

ConnectivityCallback is an inner interface having an abstract function which we’ll use to communicate with our UI classes when the server’s response comes back.

In the above checkInternetConnection function we used: “ http://clients3.google.com/generate_204” instead of Google’s normal URL “ http://www.google.com” since the first is a bit more efficient so that we don’t have to grab the whole web page.

For a successful request, the response code must be equals to 204 and no content is returned back.

We used “ setRequestProperty()” to set headers (some information the server needs to know) for the request for the server. Also, we specified the connection timeout to be one second which is a reasonable time.

But wait! Android framework does not allow network operations on the main thread so we need to use the above code on another thread. Consequently, we’ll have to post the result on the main thread again. You can use whatever is convenience for you to perform both of these operations. I would use a singleton AppExecutors class which provides executor threads for both of our cases.

postCallback() is a helper method that posts our result to the interface on the main thread.

That’s it!

To check internet connectivity in an activity:

In recent devices, Android may produce a security exception due to using HTTP URL connection. To fix this, add android:usesCleartextTraffic=”true” in your app manifest within application tag or use HTTPS instead of HTTP connections. So, pay attention to exception handling in your checkInternetConnection method.

Источник

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.

Источник