Check internet connectivity android in kotlin

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

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

Check Internet Connection Programmatically Android Kotlin

In this tutorial, I will tell you, how to check for Internet Connection availability from your Android applications. This is a step-by-step Tutorial in the Kotlin language. Let’s learn How To Check Internet Connection Programmatically In Android Kotlin.

Check Internet Connection Programmatically In Android With Kotlin

1- Create a new Android Studio Project. Name it “Check_Internet_Connection” or you can name it whatever you want.

2- After your project builds successfully, first come to your Android Manifest file and add this permission.

3- Now, come to your activity_main.xml file. Change your default Constraint Layout to a Relative Layout.

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

5- And after that our final activity_main file will look like this.

KOTLIN PART

6- Now, come to your MainActivity.kt file. So, We will take three variable here like this

7- After that, we will register an onClickListener on our Button. check_connection is the id of our button in XML. We will make use of a System Service here.

8- We will use an if-else condition here. With the help of the activeNetworkInfo method, we will check for the current state of the NetworkInfo. If the NetworkInfo is in the connected state we will display a toast message CONNECTED. whereas if the NetworkInfo is not in the connected state then we will display a toast message ” NOT CONNECTED“.

9- And our complete and final MainActivity.kt will be like this.

So I hope now you understand how to check internet connection in android programmatically using Kotlin. You can use any message in your toast that you want to display. I have used a simple button to check the status of the internet connection on the click of the button. You can use any other widget or icon according to your need. And you can use this code anywhere in your app according to your need. Do not forget to add the permission for accessing the Network_State in your Manifest file because it’s necessary permission.

That’s all for this Kotlin check internet connection tutorial. 🙂

OUTPUT

When No Internet Connection is Available

Check Internet Connection Programmatically

Wifi Icon enabled because Wifi connection is available and connected.

Check Internet Connection Programmatically

Источник

Проверьте интернет-соединение Android в Kotlin

Я попробовал ответ из этого (принятый ответ). Я могу использовать метод «PING», но пользовательский интерфейс стал черным, поскольку он говорит, что заблокирует поток пользовательского интерфейса. Это выглядело не очень хорошо и вызывало беспокойство, поэтому я попытался использовать второй метод «Подключение к сокету в Интернете», но я не знаю, как использовать этот класс в Котлине.

Это результат конвертации Java в Kotlin от Android Studio

Но я не знаю, как его использовать . Я попробовал так:

Это не работает и приводит к ошибке. Там написано, что я должен пройти «Потребитель».

У меня вопрос Как использовать этот класс ?

9 ответов

Назовите AsyncTask таким образом, он должен работать. Вам не нужно ничего менять в своей интернет-проверке AsyncTask. По сути, вам нужно передать объект, который реализует интерфейс Consumer, определенный в классе InternetCheck.

Я изменил ваш класс к этому

Таким образом, вы можете использовать лямбда-функцию, и вам также не придется иметь дело с проверкой нуля там:

Проверьте интернет-соединение в Android Kotlin

Попробуйте этот полезный метод, чтобы проверить наличие интернета.

Надеюсь это поможет.

Вы можете использовать это так:

Для получения дополнительной информации вы можете увидеть эту тему: https://youtrack.jetbrains.com/issue/KT-7770

Добавьте эти разрешения сверху в Manifest

И эта функция должна сделать свое дело. Он вернет логическое значение в зависимости от его подключения

Он имеет устаревший метод, а также последний метод, основанный на вашей версии API.

Обновить: Начиная с Android 10, использование класса NetWorkInfo и его методов устарел, теперь вы должны использовать класс ConectivityManager и getNetworkCapabilities () метод из NetworkCapabilities Class .

Источник

Pusher Logo

Show navigation menu

Handling connectivity errors in Android apps with Kotlin

In this article, we will see how we can monitor internet connection changes. When the phone is online, we will fetch data from an API, otherwise, we will display an error page. Here’s what we want to create:

Many applications require an internet connection to either fetch or save data. However, it’s normal for internet connection to be lost every now and then. As a developer, it falls to you to make sure the user has a smooth experience when using our applications and the internet connection is lost.

Prerequisites

In other to follow the tutorial, you need the following:

• Android Studio (version >= 3.x recommended). Download here.
• Basic knowledge of Kotlin.

Building our application

Launch Android Studio and create a ‘New Project…’ using the wizard. You should choose the “Basic Activity” template and select your preferred target, we are using (API 26: Android 8.0). You should also enable Kotlin support for the project.

Asides the usual dependencies that come with a new project, we need to add some dependencies. One of the dependencies we need to add is Retrofit. Retrofit is a client for making HTTP calls.

Open your build.gradle file and add the following dependencies:

Sync the gradle file so that the dependencies will be downloaded.

Next, we will request two permissions:

• Internet permission – to gain access to make network calls
• Network state – to check the network state of a device so that we know when we have an internet connection or not.

Open your AndroidManifest.xml file and add the permissions like so:

When there is a network connection, we will fetch data from an API. Let’s set up an interface to hold the endpoints we will access. Create a new Kotlin file named ApiService and paste this:

For this demo, we are only going to access one endpoint, which is equivalent to our base URL. It’s for this reason we used a dot instead of the usual /some-url in the @GET annotation.

When these items are fetched, we will display the items in a list. We, therefore, need a RecyclerView in the layout and a matching adapter. Create a new Kotlin file named RecyclerAdapter and paste this:

The adapter handles the display of items on a list. It has some overridden methods like:

• getItemCount – to tell the size of the list to be populated.
• onCreateViewHolder – used to choose a layout for a list row.
• onBindViewHolder – to bind data to each row depending on the position, etc.

Next, we will update the layout of our MainActivity ‘s activity_main.xml file like so:

The layout contains a RecyclerView for our list items and an ImageView to show an error message.

We also need an error message image. Once you have an image, rename the file to no_internet_connection and save it to your drawable folder: NameOfProject/app/src/main/res/drawable .

For us to monitor when the connectivity changes, we need broadcast receivers. Broadcast receivers are components that allow you to register and listen to Android system and application events. Usually, the Android system sends broadcast events when various system events occur and your app needs to register to get these events.

Let’s register a listener to be triggered when the internet connection is online or offline. Open your MainActivity file and paste the following code:

Above, we initialized some variables:

• arrayList – we will add fetched items to this list.
• adapter – this is the instance of the adapter class.
• retrofit – a Retrofit instance.
• broadcastReciever – this instance implements the onRecieve callback. This callback method is called when the system has notified us of a change in the network connection. In the callback, we then check to know the connectivity status thereby calling either a private connected or disconnected function.

After creating the broadcast receiver, we have to register it to get updates and unregister if there are no more activities. To do this, add the following functions to the code above in the MainActivity :

In the onCreate function, we set up our RecyclerView by calling the setupRecyclerView . Create a private function in the MainActivity class and set it up like this:

Remember we mentioned the connected and disconnected functions earlier in this post. We will now add them to the class. Add them to the MainActivity file like so:

The disconnected function is called when there is no network connection. It hides the RecyclerView and shows the ImageView . The connected function is called when there is an active internet connection. It shows the RecyclerView , hides the ImageView , and finally calls the fetchFeeds function.

Next, in the same file, paste the following code:

This function calls the API to get data. When the call is successful, we have another function that helps us add the title of the posts gotten from the endpoint to our list and then to our adapter. Create a function named addTitleToList and set it up like so:

We manually parsed the JSON here to get the title. When you ‘Run’ the app, you should have this:

Conclusion

In this post, we have learned how to monitor network changes using broadcast receivers. We saw how we register and unregister for broadcasts sent by the Android system. You have gained some valuable knowledge on handling network errors in your app. You can play around the repo here and feel free to drop your feedback.

The source code to the GitHub repo is here.

Источник