[connection] add network status monitoring

app/src/main/java/me/capcom/smsgateway/App.kt

@@ -4,6 +4,7 @@ import android.app.Application
 import healthModule
 import me.capcom.smsgateway.data.dbModule
 import me.capcom.smsgateway.helpers.SettingsHelper
+import me.capcom.smsgateway.modules.connection.connectionModule
 import me.capcom.smsgateway.modules.encryption.encryptionModule
 import me.capcom.smsgateway.modules.events.eventBusModule
 import me.capcom.smsgateway.modules.gateway.GatewayService
@@ -45,6 +46,7 @@ class App: Application() {
                 webhooksModule,
                 localserverModule,
                 pingModule,
+                connectionModule,
                 orchestratorModule,
             )
         }

app/src/main/java/me/capcom/smsgateway/modules/connection/ConnectionService.kt

@@ -0,0 +1,59 @@
+package me.capcom.smsgateway.modules.connection
+
+import android.content.Context
+import android.net.ConnectivityManager
+import android.net.Network
+import android.net.NetworkCapabilities
+import android.os.Build
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import me.capcom.smsgateway.modules.logs.LogsService
+import me.capcom.smsgateway.modules.logs.db.LogEntry
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+
+class ConnectionService(context: Context) : KoinComponent {
+    private val _status = MutableLiveData(false)
+    val status: LiveData<Boolean> = _status
+
+    private val connectivityManager =
+        context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
+    private val logsService by inject<LogsService>()
+
+    private val networkCallback = object : ConnectivityManager.NetworkCallback() {
+        override fun onLost(network: Network) {
+            logsService.insert(
+                LogEntry.Priority.WARN,
+                MODULE_NAME,
+                "Internet connection lost"
+            )
+            _status.postValue(false)
+
+            super.onLost(network)
+        }
+
+        override fun onCapabilitiesChanged(
+            network: Network,
+            networkCapabilities: NetworkCapabilities
+        ) {
+            val hasInternet =
+                networkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
+                        && (Build.VERSION.SDK_INT < Build.VERSION_CODES.M || networkCapabilities.hasCapability(
+                    NetworkCapabilities.NET_CAPABILITY_VALIDATED
+                ))
+            logsService.insert(
+                LogEntry.Priority.INFO,
+                MODULE_NAME,
+                "Internet connection status: $hasInternet"
+            )
+
+            _status.postValue(hasInternet)
+
+            super.onCapabilitiesChanged(network, networkCapabilities)
+        }
+    }
+
+    init {
+        connectivityManager.registerDefaultNetworkCallback(networkCallback)
+    }
+}

app/src/main/java/me/capcom/smsgateway/modules/connection/Module.kt

@@ -0,0 +1,10 @@
+package me.capcom.smsgateway.modules.connection
+
+import org.koin.core.module.dsl.singleOf
+import org.koin.dsl.module
+
+val connectionModule = module {
+    singleOf(::ConnectionService)
+}
+
+val MODULE_NAME = "connection"

app/src/main/java/me/capcom/smsgateway/ui/HomeFragment.kt

@@ -29,6 +29,7 @@ import kotlinx.coroutines.launch
 import me.capcom.smsgateway.R
 import me.capcom.smsgateway.databinding.FragmentSettingsBinding
 import me.capcom.smsgateway.helpers.SettingsHelper
+import me.capcom.smsgateway.modules.connection.ConnectionService
 import me.capcom.smsgateway.modules.events.EventBus
 import me.capcom.smsgateway.modules.gateway.GatewayService
 import me.capcom.smsgateway.modules.gateway.GatewaySettings
@@ -47,6 +48,7 @@ class HomeFragment : Fragment() {
     private val settingsHelper: SettingsHelper by inject()
     private val localServerSettings: LocalServerSettings by inject()
     private val gatewaySettings: GatewaySettings by inject()
+    private val connectionService: ConnectionService by inject()
 
     private val events: EventBus by inject()
 
@@ -79,6 +81,7 @@ class HomeFragment : Fragment() {
         binding.switchUseRemoteServer.setOnCheckedChangeListener { _, isChecked ->
             gatewaySettings.enabled = isChecked
             binding.layoutRemoteServer.isVisible = isChecked
+            binding.textConnectionStatus.isVisible = isChecked
 
             restartRequiredNotification()
         }
@@ -162,6 +165,16 @@ class HomeFragment : Fragment() {
         stateLiveData.observe(viewLifecycleOwner) {
             binding.buttonStart.isChecked = it
         }
+
+        connectionService.status.observe(viewLifecycleOwner) {
+            binding.textConnectionStatus.apply {
+                isEnabled = it
+                text = when (it) {
+                    true -> context.getString(R.string.internet_connection_available)
+                    false -> context.getString(R.string.internet_connection_unavailable)
+                }
+            }
+        }
     }
 
     private fun makeCopyableLink(source: Spanned): Spanned {

app/src/main/res/color/connection_status_background.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- State: Disconnected -->
+    <item android:color="@android:color/holo_red_light" android:state_enabled="false" />
+
+    <!-- State: Connected -->
+    <item android:color="@android:color/holo_green_light" android:state_enabled="true" />
+
+    <!-- Default State -->
+    <item android:color="@android:color/darker_gray" />
+</selector>

app/src/main/res/drawable/rounded_background.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android">
+    <corners android:radius="8dp" />
+    <solid android:color="@android:color/white" />
+</shape>

app/src/main/res/layout/fragment_settings.xml

@@ -6,6 +6,20 @@
     android:orientation="vertical"
     tools:context=".ui.HomeFragment">
 
+    <TextView
+        android:id="@+id/textConnectionStatus"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="4dp"
+        android:background="@drawable/rounded_background"
+        android:backgroundTint="@color/connection_status_background"
+        android:enabled="true"
+        android:gravity="center"
+        android:padding="8dp"
+        android:textColor="@android:color/white"
+        android:visibility="gone"
+        tools:text="@string/internet_connection_available" />
+
     <ScrollView
         android:layout_width="match_parent"
         android:layout_height="0dp"

app/src/main/res/values/strings.xml

@@ -18,9 +18,14 @@
     <string name="dots">…</string>
     <string name="enabled">Enabled</string>
     <string name="encryption">Encryption</string>
+    <string name="failed_to_change_password">Failed to change password: %1$s</string>
+    <string name="if_sim_number_is_not_specified_use">If SIM number is not specified, use</string>
     <string name="ignored_for_public_server">Ignored for public server</string>
     <string name="information">Information</string>
+    <string name="internet_connection_available">Internet connection: available</string>
+    <string name="internet_connection_unavailable">Internet connection: unavailable</string>
     <string name="interval_seconds">Interval (seconds)</string>
+    <string name="invalid_url">Invalid URL</string>
     <string name="is_not_a_valid_port_must_be_between_1024_and_65535">%1$s is not a valid port. Must be between 1024 and 65535</string>
     <string name="label_password">Password:</string>
     <string name="label_username">Username:</string>
@@ -31,14 +36,18 @@
     <string name="local_sms_gateway_notifications">Local SMS Gateway notifications</string>
     <string name="logs">Logs</string>
     <string name="maximum">Maximum</string>
+    <string name="messages">Messages…</string>
     <string name="messages_count">Messages count</string>
     <string name="messages_header">Messages</string>
     <string name="minimum">Minimum</string>
     <string name="more_settings">More settings…</string>
+    <string name="not_set">Not set</string>
     <string name="notification_title">SMS Gateway</string>
     <string name="online_status_at_the_cost_of_battery_life">Online status at the cost of battery life</string>
     <string name="passphrase">Passphrase</string>
     <string name="password">Password</string>
+    <string name="password_changed_successfully">Password changed successfully</string>
+    <string name="password_must_be_at_least_14_characters">Password must be at least 14 characters</string>
     <string name="password_must_be_at_least_8_characters">Password must be at least 8 characters</string>
     <string name="period">Period</string>
     <string name="ping">Ping</string>
@@ -76,11 +85,4 @@
     <string name="username_must_be_at_least_3_characters">Username must be at least 3 characters</string>
     <string name="view">View</string>
     <string name="webhooks">Webhooks</string>
-    <string name="invalid_url">Invalid URL</string>
-    <string name="not_set">Not set</string>
-    <string name="password_must_be_at_least_14_characters">Password must be at least 14 characters</string>
-    <string name="password_changed_successfully">Password changed successfully</string>
-    <string name="failed_to_change_password">Failed to change password: %1$s</string>
-    <string name="messages">Messages…</string>
-    <string name="if_sim_number_is_not_specified_use">If SIM number is not specified, use</string>
 </resources>