connectivity

Project Url: jordond/connectivity
Introduction: 🛜 Kotlin Multiplatform library for monitoring network connectivity
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Maven Central Version Kotlin Build License

Connectivity provides network monitoring capabilities for multiplatform projects. It can monitor network connectivity using native APIs on Android and Apple devices, or by making HTTP requests to specified hosts.

You can also view the generated KDoc at connectivity.jordond.dev

Features

Monitor network connectivity:

  • Native network monitoring on Android and Apple devices.
  • Using HTTP requests and polling to monitor network connectivity on all platforms.

Platforms

This library is written for Kotlin Multiplatform, and can be used on the following platforms:

Artifact Android iOS macOS tvOS JVM js/wasm
connectivity-core ✅ ✅ ✅ ✅ ✅ ✅
connectivity-device ✅ ✅ ✅ ✅ ❌ ❌
connectivity-android ✅ ❌ ❌ ❌ ❌ ❌
connectivity-apple ❌ ✅ ✅ ✅ ❌ ❌
connectivity-http ✅ ✅ ✅ ✅ ✅ ✅
connectivity-compose ✅ ✅ ❌ ❌ ✅ ✅
connectivity-compose-device ✅ ✅ ❌ ❌ ✅ ✅
connectivity-compose-http ✅ ✅ ❌ ❌ ✅ ✅

Setup

Add the following dependencies to your project, depending on the platform you are targeting.

[versions]
connectivity = "1.1.0"

[libraries]
connectivity-core = { module = "dev.jordond.connectivity:connectivity-core", version.ref = "connectivity" }
connectivity-device = { module = "dev.jordond.connectivity:connectivity-device", version.ref = "connectivity" }
connectivity-android = { module = "dev.jordond.connectivity:connectivity-android", version.ref = "connectivity" }
connectivity-apple = { module = "dev.jordond.connectivity:connectivity-apple", version.ref = "connectivity" }
connectivity-http = { module = "dev.jordond.connectivity:connectivity-http", version.ref = "connectivity" }
connectivity-compose = { module = "dev.jordond.connectivity:connectivity-compose", version.ref = "connectivity" }
connectivity-compose-device = { module = "dev.jordond.connectivity:connectivity-compose-device", version.ref = "connectivity" }
connectivity-compose-http = { module = "dev.jordond.connectivity:connectivity-compose-http", version.ref = "connectivity" }

Single Platform

Here is an example of how to add the dependencies to a single platform project targeting Android:

dependencies {
  implementation(libs.connectivity.core)
  implementation(libs.connectivity.android)

  // For compose support
  implementation(libs.connectivity.compose.device)
}

Multiplatform - Device

Here is an example of how to add the dependencies to a multiplatform project that targets both Android and Apple devices:

kotlin {
    sourceSets {
        commonMain.dependencies {
          implementation(libs.connectivity.core)
          implementation(libs.connectivity.device)

          // For compose support
          implementation(libs.connectivity.compose.device)
        }
    }
}

All supported platforms

Here is an example of how to add the dependencies to a multiplatform project that targets all the supported platforms. It uses the connectivity-device for mobile targets, and connectivity-http for the rest:

kotlin {
    sourceSets {
        commonMain.dependencies {
          implementation(libs.connectivity.core)

          // For compose support
          implementation(libs.connectivity.compose)
        }

        val deviceMain by creating {
            dependsOn(commonMain.get())
            androidMain.get().dependsOn(this)
            appleMain.get().dependsOn(this)
            dependencies {
              implementation(libs.connectivity.device)

              // For compose support
              implementation(libs.connectivity.compose.device)
            }
        }

        val httpMain by creating {
            dependsOn(commonMain.get())
            jvmMain.get().dependsOn(this)
            jsMain.get().dependsOn(this)
            wasmJsMain.get().dependsOn(this)
            dependencies {
              implementation(libs.connectivity.http)

              // For compose support
              implementation(libs.connectivity.compose.http)
            }
        }
    }
}

See the demo project for a complete example.

Usage

Basic usage of Connectivity is simple, you just need an instance of the Connectivity object, then you can observe the network connectivity.

val connectivity = Connectivity()
connectivity.start()
coroutineScope.launch {
  connectivity.statusUpdates.collect { status ->
    when (status) {
      is Connectivity.Status.Connected -> println("Connected to network")
      is Connectivity.Status.Disconnected -> println("Disconnected from network")
    }
  }
}

You can also get the current connectivity status by invoking the suspended status() function:

val connectivity = Connectivity()
coroutineScope.launch {
    val status = connectivity.status()
    when (status) {
        is Connectivity.Status.Connected -> println("Connected to network")
        is Connectivity.Status.Disconnected -> println("Disconnected from network")
    }
}

By default when you construct a Connectivity object, it will not automatically start monitoring network connectivity. You can enable this by passing in ConnectivityOptions():

Options

val connectivity = Connectivity {
    autoStart = true
}

You can start or stop monitoring network connectivity manually:

val connectivity = Connectivity()
connectivity.start()

// At some later point
connectivity.stop()

The above Connectivity() function is a factory function provided by the platform-specific modules. The connectivity-core module provides a factory function defined as:

fun Connectivity(
    provider: ConnectivityProvider,
    options: ConnectivityOptions = ConnectivityOptions(),
    scope: CoroutineScope = CoroutineScope(Dispatchers.Default),
): Connectivity

HTTP monitoring

The connectivity-http module provides a way to monitor network connectivity by making HTTP requests to specified urls. By default it will check connectivity to "google.com", "github.com", and "bing.com" on port 443. It will check for the first successful response, and then update the status.

The network status is updated by polling the urls at a specified interval. The default interval is 5 minutes.

You can customize the HTTP monitoring like so:

Note: This is only available in the connectivity-http module.

val connectivity = Connectivity {
  urls("cloudflare.com", "my-own-domain.com") // Defaults to ["google.com", "github.com", "bing.com"]
  port = 80 // Defaults to 443
  pollingIntervalMs = 10.minutes // Defaults to 5 minutes
  timeoutMs = 5.seconds // Defaults to 2 seconds

  // Callback for when a poll is completed
  onPollResult { result ->
    when (result) {
      is PollResult.Error -> println("Poll error: ${result.error}")
      is PollResult.Response -> println("Poll http response: ${result.response}")
    }
  }
}

Compose

Connectivity also provides support for Compose Multiplatform. To use it you will have to make sure you add the dependencies for the connectivity-compose-x modules.

Then you can use it like so:

Note: This composable is provided by either connectivity-compose-device or connectivity-compose-http artifact.

@Composable
fun MyApp() {
  val state = rememberConnectivityState {
    // Optional configurator for ConnectivityOptions
    autoStart = true
  }

  when (state.status) {
    is Connectivity.Status.Connected -> Text("Connected to network")
    is Connectivity.Status.Disconnected -> Text("Disconnected from network")
    else -> {}
  }
}

Multiple Targets

If you need to support both Device and HTTP monitoring in the same project, you will have to do something similar to this.

Example:

// commonMain/Platform.kt
expect fun createConnectivity(): Connectivity

Then define the actual functions:

// deviceMain/Platform.device.kt
actual fun createConnectivityState(): Connectivity {
  return Connectivity {
    autoStart = true
  }
}

// httpMain/Platform.http.kt
actual fun createConnectivityState(): Connectivity {
  return Connectivity {
    autoStart = true
    urls("cloudflare.com", "my-own-domain.com")
    port = 80
    pollingIntervalMs = 10.minutes
    timeoutMs = 5.seconds
  }
}

Then it can be used like so:

@Composable
fun MyApp() {
  val state = createConnectivityState()

  when (state.status) {
    is Connectivity.Status.Connected -> Text("Connected to network")
    is Connectivity.Status.Disconnected -> Text("Disconnected from network")
    else -> {}
  }
}

Demo

A demo app is available in the demo directory. It is a Compose Multiplatform app that runs on Android, and iOS.

Contributing

Contributions are always welcome!. If you'd like to contribute, please feel free to create a PR or open an issue.

License

See LICENSE for more information.

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