First Commit

features/networkmonitor/impl/build.gradle.kts

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+import extension.setupDependencyInjection
+
+/*
+ * Copyright (c) 2025 Element Creations Ltd.
+ * Copyright 2022-2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+plugins {
+    id("io.element.android-library")
+}
+
+setupDependencyInjection()
+
+android {
+    namespace = "io.element.android.features.networkmonitor.impl"
+}
+
+dependencies {
+    implementation(libs.coroutines.core)
+    implementation(projects.libraries.core)
+    implementation(projects.libraries.di)
+    api(projects.features.networkmonitor.api)
+}

features/networkmonitor/impl/src/main/AndroidManifest.xml

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+<!--
+  ~ Copyright (c) 2025 Element Creations Ltd.
+  ~ Copyright 2023 New Vector Ltd.
+  ~
+  ~ SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+  ~ Please see LICENSE files in the repository root for full details.
+  -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+</manifest>

features/networkmonitor/impl/src/main/kotlin/io/element/android/features/networkmonitor/impl/DefaultNetworkMonitor.kt

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+/*
+ * Copyright (c) 2025 Element Creations Ltd.
+ * Copyright 2023-2025 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+@file:OptIn(FlowPreview::class)
+
+package io.element.android.features.networkmonitor.impl
+
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.Network
+import android.net.NetworkRequest
+import dev.zacsweers.metro.AppScope
+import dev.zacsweers.metro.ContributesBinding
+import dev.zacsweers.metro.SingleIn
+import io.element.android.features.networkmonitor.api.NetworkMonitor
+import io.element.android.features.networkmonitor.api.NetworkStatus
+import io.element.android.libraries.di.annotations.AppCoroutineScope
+import io.element.android.libraries.di.annotations.ApplicationContext
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.FlowPreview
+import kotlinx.coroutines.channels.awaitClose
+import kotlinx.coroutines.channels.trySendBlocking
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.callbackFlow
+import kotlinx.coroutines.flow.debounce
+import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.stateIn
+import timber.log.Timber
+import java.util.concurrent.atomic.AtomicInteger
+
+@ContributesBinding(scope = AppScope::class)
+@SingleIn(AppScope::class)
+class DefaultNetworkMonitor(
+    @ApplicationContext context: Context,
+    @AppCoroutineScope
+    appCoroutineScope: CoroutineScope,
+) : NetworkMonitor {
+    private val connectivityManager: ConnectivityManager = context.getSystemService(ConnectivityManager::class.java)
+
+    override val connectivity: StateFlow<NetworkStatus> = callbackFlow {
+
+        /**
+         *  Calling connectivityManager methods synchronously from the callbacks is not safe.
+         *  So instead we just keep the count of active networks, ie. those checking the capability request.
+         *  Debounce the result to avoid quick offline<->online changes.
+         */
+        val callback = object : ConnectivityManager.NetworkCallback() {
+            private val activeNetworksCount = AtomicInteger(0)
+
+            override fun onLost(network: Network) {
+                if (activeNetworksCount.decrementAndGet() == 0) {
+                    trySendBlocking(NetworkStatus.Disconnected)
+                }
+            }
+
+            override fun onAvailable(network: Network) {
+                if (activeNetworksCount.incrementAndGet() > 0) {
+                    trySendBlocking(NetworkStatus.Connected)
+                }
+            }
+        }
+        trySendBlocking(connectivityManager.activeNetworkStatus())
+        val request = NetworkRequest.Builder().build()
+
+        connectivityManager.registerNetworkCallback(request, callback)
+        Timber.d("Subscribe")
+        awaitClose {
+            Timber.d("Unsubscribe")
+            connectivityManager.unregisterNetworkCallback(callback)
+        }
+    }
+        .distinctUntilChanged()
+        .debounce(300)
+        .onEach {
+            Timber.d("NetworkStatus changed=$it")
+        }
+        .stateIn(appCoroutineScope, SharingStarted.WhileSubscribed(), connectivityManager.activeNetworkStatus())
+
+    private fun ConnectivityManager.activeNetworkStatus(): NetworkStatus {
+        return if (activeNetwork != null) NetworkStatus.Connected else NetworkStatus.Disconnected
+    }
+}