Check your internet connection андроид

Для Android проверить подключение к интернету [дубликат]

этот вопрос уже есть ответ здесь:

• Как проверить доступ в интернет на Android? InetAddress не раз 49 ответы

Я хочу создать приложение, которое использует интернет, и я пытаюсь создать функцию, которая проверяет, доступно ли соединение, а если нет, перейдите к действию, которое имеет кнопку повтора и объяснение.

прилагается мой код до сих пор, но я получаю ошибку Syntax error, insert «>» to complete MethodBody.

теперь я помещаю их в попытке заставить его работать, но до сих пор не повезло. Любая помощь будет оценена по достоинству.

20 ответов:

этот метод проверяет, подключен ли мобильный телефон к интернету и возвращает true, если он подключен:

Edit: Этот метод фактически проверяет, подключено ли устройство к интернету (есть возможность, что оно подключено к сети, но не к интернету).

убедитесь, что он «подключен» к сети:

убедитесь, что он «подключен» к сети:

вы можете просто пинговать онлайн-сайт, как google:

вышеуказанные методы работают, когда вы подключены к источнику Wi-Fi или через пакеты данных сотового телефона. Но в случае подключения Wi-Fi есть случаи, когда вас дополнительно просят войти в систему, как в кафе. Так что в этом случае ваше приложение не удастся, как вы подключены к источнику Wi-Fi, но не с Интернетом.

этот метод работает отлично.

пожалуйста, используйте это в отдельном потоке от основного потока, как это делает сетевой вызов и будет бросать NetwrokOnMainThreadException если не следовать.

а также не помещайте этот метод в onCreate или любой другой метод. Поместите его в класс и получите к нему доступ.

редактирование принятого ответа показывает, как проверить, можно ли что-то в интернете. Мне пришлось слишком долго ждать ответа, когда это было не так (с Wi-Fi, который не имеет подключения к интернету). К Сожалению InetAddress.getByName не имеет параметра timeout, поэтому следующий код работает вокруг этого:

вы не можете создать метод внутри другого метода, перемещение private boolean checkInternetConnection() < способ из onCreate

вы можете использовать следующий фрагмент для проверки подключения к интернету.

это будет полезно в обоих случаях, что вы можете проверить, какие тип сеть Соединение доступно, так что вы можете сделать свой процесс на этом пути.

вы просто должны скопировать следующий класс и вставить непосредственно в пакет.

Теперь вы можете использовать как:

Не забудьте взять разрешение 🙂 🙂

вы можете изменить на основе ваших требований.

все официальные методы только говорит, открыто ли устройство для сети или нет,
если ваше устройство подключено к Wi-Fi, но Wifi не подключен к интернету, то этот метод не будет работать (что происходит много раз), никакой встроенный метод обнаружения сети не расскажет об этом сценарии, поэтому созданный асинхронный класс обратного вызова, который вернется в onConnectionSuccess и onConnectionFail

сетевой вызов из асинхронного режима Задача

фактический класс, который будет пинговать на сервер

не нужно быть сложным. Самый простой и рамочный способ-использовать ACCESS_NETWORK_STATE разрешение и просто сделать подключенный метод

вы также можете использовать requestRouteToHost Если у вас есть particualr хост и тип подключения (wifi/mobile) в виду.

в вашем манифесте android.

для более подробной информации иди сюда

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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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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.

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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

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