SonarNet

An open-source Android library providing a better implementation of Internet access and captive portals detection in your apps.

Technology stack

• SonarNet is primarily built in Kotlin

• Compatible with Android 5.0+ (API level >= 21)

Features

• Detect when device has joined a network that has no Internet access.
• Detect when connected to a router with captive portal

How it works

SonarNet wraps the ConnectivityManager and lets your app detect true Internet access, not just if the device has joinded a network. So when ConnectivityManager detects Wi-Fi or Cellular network, SonarNet uses a tiny HTTP probe to a known URL (such as connectivitycheck.gstatic.com), to detect whether there is true Internet access, or whether a captive portal is preventing the device to access Internet.

Add Sonarnet to your project

Step 1: Add in your root build.gradle at the end of repositories:

   allprojects {
    repositories {
       maven { url 'https://jitpack.io' }
    }
   }
 

or if there is (the new) dependencyResolutionManagement in settings.gradle :

   dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        maven { url 'https://jitpack.io' }
    }
  }

Step 2: Add the dependency

   dependencies {
     implementation 'com.github.fabricethilaw:sonarnet:1.0.0'
   }

Check Internet status

Usable in any class.

// Detect that INTERNET is available. Get the result from a callback
SonarNet.ping { result ->
    // check result
    when(result) {
        InternetStatus.INTERNET -> {}
        InternetStatus.NO_INTERNET -> {}
        InternetStatus.CAPTIVE_PORTAL -> {}
     }
}

You can also call Ping as a suspending function :

val internetStatus: InternetStatus = SonarNet.ping()
if(internetStatus == INTERNET) {
  // Do something
} else {
  // Proceed otherwise
}

Here is a idiom that enables to perform an action only if internet is available:

SonarNet.runWithInternet {
           // block of logic
        }

Note: In order to perform network operations, the following permissions must be added into your application AndroidManifest.xml :

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Notifications

If you prefer receiving notifications about changes in connectivity , you would provide a context ( from an Activity or a Fragment ) and register a ConnectivityCallback .

A notification from ConnectivityCallback provides knowledge about InternetStatus and the connected NetworkType

// Set a connectivity callback
 val connectivityCallback = object : ConnectivityCallback {
      override fun onConnectionChanged(result: ConnectivityResult) {
          // Check the result, see the Using Results section
         }
     }

  // register the callback
 SonarNet(context).registerConnectivityCallback(connectivityCallback)
 

When you no longer want to receive updates on connectivity events :

// unregister the callback
 SonarNet(context).unregisterConnectivityCallback()

Using results

ConnectivityResult is provided in network notification callbacks. It has a few useful fields :

• internetStatus value can be one of : INTERNET, NO_INTERNET, CAPTIVE_PORTAL

• networkType value can be one of : Cellular, Wifi, Ethernet, Unknown

Network types

You may also use the following methods if you are only interested in checking the type of connected network :

connectedViaWiFi(), connectedViaCellular(), connectedViaEthernet()

Getting help

If you have questions, concerns, bug reports, etc, please file an issue in this repository's Issue Tracker.

Getting involved

You have checked this library out.

• Did you find a bug ?
• Did you write a patch that fixes a bug?
• Do you intend to add a new feature or change an existing one?

We encourage you to read the instructions on how to contribute, stated in CONTRIBUTING.