fix: Close adb when app closes (#153)

The gui now properly closes the adb server when it's being closed, if it
started it. Won't touch it if other process started it.

Author: prateek-who

src/main/kotlin/app/morphe/gui/App.kt

@@ -51,6 +51,21 @@ val LocalModeState = staticCompositionLocalOf<ModeState> {
     error("No ModeState provided")
 }
 
+/**
+ * Auto-start ADB preference. Exposed as a composition local so the
+ * SettingsDialog (writer) and DeviceIndicator + install buttons (readers)
+ * can react without prop-drilling through Voyager screens. App-level
+ * lifecycle (start/stop the daemon when this flips) is handled in [App.kt].
+ */
+data class AdbPreferenceState(
+    val enabled: Boolean,
+    val onChange: (Boolean) -> Unit,
+)
+
+val LocalAdbPreference = staticCompositionLocalOf<AdbPreferenceState> {
+    error("No AdbPreferenceState provided")
+}
+
 @Composable
 fun App(
     initialSimplifiedMode: Boolean = true
@@ -76,6 +91,7 @@ private fun AppContent(
 
     var themePreference by remember { mutableStateOf(ThemePreference.SYSTEM) }
     var isSimplifiedMode by remember { mutableStateOf(initialSimplifiedMode) }
+    var autoStartAdb by remember { mutableStateOf(false) }
     var isLoading by remember { mutableStateOf(true) }
 
     // Initialize PatchSourceManager and load config on startup
@@ -84,6 +100,7 @@ private fun AppContent(
         val config = configRepository.loadConfig()
         themePreference = config.getThemePreference()
         isSimplifiedMode = config.useSimplifiedMode
+        autoStartAdb = config.autoStartAdb
         isLoading = false
     }
 
@@ -105,6 +122,23 @@ private fun AppContent(
         }
     }
 
+    // Callback for the auto-start ADB toggle. Persists the preference AND
+    // applies the change immediately: ON spins up DeviceMonitor (which
+    // explicitly start-server's adb and records ownership); OFF cancels
+    // polling and kill-server's the daemon if Morphe owns it.
+    val onAutoStartAdbChange: (Boolean) -> Unit = { enabled ->
+        autoStartAdb = enabled
+        scope.launch {
+            configRepository.setAutoStartAdb(enabled)
+            if (enabled) {
+                DeviceMonitor.startMonitoring()
+            } else {
+                DeviceMonitor.stopMonitoringAndKillIfOwned()
+            }
+            Logger.info("Auto-start ADB ${if (enabled) "enabled" else "disabled"}")
+        }
+    }
+
     val themeState = ThemeState(
         current = themePreference,
         onChange = onThemeChange
@@ -115,9 +149,24 @@ private fun AppContent(
         onChange = onModeChange
     )
 
-    // Start/stop DeviceMonitor with app lifecycle
+    val adbPreferenceState = AdbPreferenceState(
+        enabled = autoStartAdb,
+        onChange = onAutoStartAdbChange
+    )
+
+    // Initial DeviceMonitor start. Gated on autoStartAdb so users who left
+    // the toggle OFF don't spawn an unwanted adb daemon at launch. Runs once
+    // after config finishes loading. Subsequent live toggles go through
+    // [onAutoStartAdbChange], not this effect.
+    LaunchedEffect(isLoading, autoStartAdb) {
+        if (!isLoading && autoStartAdb) {
+            DeviceMonitor.startMonitoring()
+        }
+    }
+    // On Compose teardown (window close → exitApplication), cancel polling.
+    // The kill-if-owned half runs from the JVM shutdown hook in [GuiMain.kt]
+    // so it works even when the user quits via Cmd+Q without disposing.
     DisposableEffect(Unit) {
-        DeviceMonitor.startMonitoring()
         onDispose {
             DeviceMonitor.stopMonitoring()
         }
@@ -126,7 +175,8 @@ private fun AppContent(
     MorpheTheme(themePreference = themePreference) {
         CompositionLocalProvider(
             LocalThemeState provides themeState,
-            LocalModeState provides modeState
+            LocalModeState provides modeState,
+            LocalAdbPreference provides adbPreferenceState
         ) {
             // Tint the OS title bar (Windows DWM caption color, macOS traffic
             // light contrast) to match the active theme's surface color.

src/main/kotlin/app/morphe/gui/GuiMain.kt

@@ -18,6 +18,8 @@ import androidx.compose.ui.window.WindowPosition
 import androidx.compose.ui.window.application
 import androidx.compose.ui.window.rememberWindowState
 import app.morphe.gui.data.model.AppConfig
+import app.morphe.gui.util.DeviceMonitor
+import kotlinx.coroutines.runBlocking
 import kotlinx.serialization.json.Json
 import org.jetbrains.skia.Image
 import app.morphe.gui.util.FileUtils
@@ -34,6 +36,18 @@ fun launchGui(args: Array<String>) = application {
         else -> loadConfigSync().useSimplifiedMode
     }
 
+    // Belt-and-braces: on any JVM-normal exit path (window close, Cmd+Q,
+    // SIGTERM), kill the ADB daemon if Morphe spawned it. Compose's
+    // DisposableEffect already cancels polling; this hook covers shutdown
+    // routes where Compose teardown doesn't reach the suspend kill call.
+    remember {
+        Runtime.getRuntime().addShutdownHook(Thread {
+            runCatching {
+                runBlocking { DeviceMonitor.stopMonitoringAndKillIfOwned() }
+            }
+        })
+    }
+
     val windowState = rememberWindowState(
         size = DpSize(1024.dp, 768.dp),
         position = WindowPosition(Alignment.Center)

src/main/kotlin/app/morphe/gui/data/model/AppConfig.kt

@@ -76,6 +76,12 @@ data class AppConfig(
     // after upgrading to multi-source builds. Flips to true once the user dismisses
     // the banner, never resets.
     val multiSourceHintDismissed: Boolean = false,
+    // Whether Morphe should auto-start the ADB daemon at GUI launch to monitor
+    // connected devices. Default OFF — many users never push patched APKs to a
+    // device, so spawning a long-lived adb server unprompted is unwanted noise.
+    // When ON, DeviceMonitor polls devices; if Morphe was the one that started
+    // the daemon, it's killed on toggle-OFF and on window close.
+    val autoStartAdb: Boolean = false,
 ) {
 
     fun getUpdateChannelPreference(): UpdateChannelPreference? {

src/main/kotlin/app/morphe/gui/data/repository/ConfigRepository.kt

@@ -296,6 +296,14 @@ class ConfigRepository {
         saveConfig(current.copy(patchSource = updatedSources))
     }
 
+    /**
+     * Update whether Morphe auto-starts the ADB daemon at GUI launch.
+     */
+    suspend fun setAutoStartAdb(enabled: Boolean) {
+        val current = loadConfig()
+        saveConfig(current.copy(autoStartAdb = enabled))
+    }
+
     /**
      * Mark the multi-source upgrade hint as dismissed. One-shot — never resets.
      */

src/main/kotlin/app/morphe/gui/ui/components/DeviceIndicator.kt

@@ -20,6 +20,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowDropDown
 import androidx.compose.material.icons.filled.PhoneAndroid
 import androidx.compose.material.icons.filled.Info
+import androidx.compose.material.icons.filled.PowerSettingsNew
 import androidx.compose.material.icons.filled.UsbOff
 import androidx.compose.material3.*
 import androidx.compose.runtime.*
@@ -31,6 +32,7 @@ import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import app.morphe.gui.LocalAdbPreference
 import app.morphe.gui.ui.theme.LocalMorpheAccents
 import app.morphe.gui.ui.theme.LocalMorpheFont
 import app.morphe.gui.ui.theme.LocalMorpheCorners
@@ -42,8 +44,10 @@ fun DeviceIndicator(modifier: Modifier = Modifier) {
     val corners = LocalMorpheCorners.current
     val mono = LocalMorpheFont.current
     val accents = LocalMorpheAccents.current
+    val adbPreference = LocalAdbPreference.current
     val monitorState by DeviceMonitor.state.collectAsState()
 
+    val isAdbDisabledByUser = !adbPreference.enabled
     val isAdbAvailable = monitorState.isAdbAvailable
     val readyDevices = monitorState.devices.filter { it.isReady }
     val unauthorizedDevices = monitorState.devices.filter { it.status == DeviceStatus.UNAUTHORIZED }
@@ -55,6 +59,7 @@ fun DeviceIndicator(modifier: Modifier = Modifier) {
     val isHovered by hoverInteraction.collectIsHoveredAsState()
 
     val dotColor = when {
+        isAdbDisabledByUser -> MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.25f)
         isAdbAvailable == false -> MaterialTheme.colorScheme.error.copy(alpha = 0.7f)
         selectedDevice != null && selectedDevice.isReady -> accents.secondary
         unauthorizedDevices.isNotEmpty() -> accents.warning
@@ -94,6 +99,7 @@ fun DeviceIndicator(modifier: Modifier = Modifier) {
                 )
 
                 val displayText = when {
+                    isAdbDisabledByUser -> "ADB OFF"
                     isAdbAvailable == null -> "Checking…"
                     isAdbAvailable == false -> "No ADB"
                     selectedDevice != null -> {
@@ -110,6 +116,7 @@ fun DeviceIndicator(modifier: Modifier = Modifier) {
                     fontWeight = FontWeight.Medium,
                     fontFamily = mono,
                     color = when {
+                        isAdbDisabledByUser -> MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
                         isAdbAvailable == false -> MaterialTheme.colorScheme.error.copy(alpha = 0.7f)
                         selectedDevice != null -> MaterialTheme.colorScheme.onSurface
                         unauthorizedDevices.isNotEmpty() -> accents.warning
@@ -138,6 +145,67 @@ fun DeviceIndicator(modifier: Modifier = Modifier) {
             border = BorderStroke(1.dp, MaterialTheme.colorScheme.outline.copy(alpha = 0.12f))
         ) {
             when {
+                isAdbDisabledByUser -> {
+                    DropdownMenuItem(
+                        text = {
+                            Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                horizontalArrangement = Arrangement.spacedBy(8.dp)
+                            ) {
+                                Icon(
+                                    imageVector = Icons.Default.PowerSettingsNew,
+                                    contentDescription = null,
+                                    modifier = Modifier.size(14.dp),
+                                    tint = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                                )
+                                Column {
+                                    Text(
+                                        text = "ADB is off",
+                                        fontSize = 12.sp,
+                                        fontWeight = FontWeight.SemiBold,
+                                        fontFamily = mono,
+                                        color = MaterialTheme.colorScheme.onSurface
+                                    )
+                                    Text(
+                                        text = "Morphe is not monitoring connected devices",
+                                        fontSize = 10.sp,
+                                        fontFamily = mono,
+                                        color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.5f)
+                                    )
+                                }
+                            }
+                        },
+                        onClick = { showPopup = false }
+                    )
+                    HorizontalDivider(modifier = Modifier.padding(vertical = 4.dp))
+                    DropdownMenuItem(
+                        text = {
+                            Row(
+                                verticalAlignment = Alignment.CenterVertically,
+                                horizontalArrangement = Arrangement.spacedBy(8.dp)
+                            ) {
+                                Icon(
+                                    imageVector = Icons.Default.PowerSettingsNew,
+                                    contentDescription = null,
+                                    modifier = Modifier.size(14.dp),
+                                    tint = accents.primary
+                                )
+                                Text(
+                                    text = "Enable ADB",
+                                    fontSize = 11.sp,
+                                    fontWeight = FontWeight.Medium,
+                                    fontFamily = mono,
+                                    color = accents.primary
+                                )
+                            }
+                        },
+                        onClick = {
+                            adbPreference.onChange(true)
+                            showPopup = false
+                        }
+                    )
+                }
+
                 isAdbAvailable == false -> {
                     DropdownMenuItem(
                         text = {

src/main/kotlin/app/morphe/gui/ui/components/SettingsButton.kt

@@ -5,6 +5,7 @@
 
 package app.morphe.gui.ui.components
 
+import app.morphe.gui.LocalAdbPreference
 import app.morphe.gui.LocalModeState
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.tween
@@ -60,6 +61,7 @@ fun SettingsButton(
     val corners = LocalMorpheCorners.current
     val themeState = LocalThemeState.current
     val modeState = LocalModeState.current
+    val adbPreference = LocalAdbPreference.current
     val configRepository: ConfigRepository = koinInject()
     val patchSourceManager: PatchSourceManager = koinInject()
     val updateCheckRepository: UpdateCheckRepository = koinInject()
@@ -194,6 +196,8 @@ fun SettingsButton(
                     }
                 }
             },
+            autoStartAdb = adbPreference.enabled,
+            onAutoStartAdbChange = { adbPreference.onChange(it) },
             collapsibleSectionStates = collapsibleSectionStates,
             onCollapsibleSectionToggle = { id, expanded ->
                 collapsibleSectionStates = collapsibleSectionStates + (id to expanded)

src/main/kotlin/app/morphe/gui/ui/components/SettingsDialog.kt

@@ -107,6 +107,8 @@ fun SettingsDialog(
     onKeepArchitecturesChange: (Set<String>) -> Unit = {},
     updateChannelPreference: app.morphe.gui.data.model.UpdateChannelPreference = app.morphe.gui.data.model.UpdateChannelPreference.STABLE,
     onUpdateChannelChange: (app.morphe.gui.data.model.UpdateChannelPreference) -> Unit = {},
+    autoStartAdb: Boolean = false,
+    onAutoStartAdbChange: (Boolean) -> Unit = {},
     collapsibleSectionStates: Map<String, Boolean> = emptyMap(),
     onCollapsibleSectionToggle: (id: String, expanded: Boolean) -> Unit = { _, _ -> }
 ) {
@@ -277,6 +279,20 @@ fun SettingsDialog(
 
                 SettingsDivider(borderColor)
 
+                // ── Auto-start ADB ──
+                SettingToggleRow(
+                    label = "Auto-start ADB",
+                    description = "Spawn the ADB daemon on launch so connected devices are monitored. " +
+                        "When off, Morphe never starts the server, and install/push features are disabled.",
+                    checked = autoStartAdb,
+                    onCheckedChange = onAutoStartAdbChange,
+                    accentColor = accents.primary,
+                    mono = mono,
+                    enabled = !isPatching
+                )
+
+                SettingsDivider(borderColor)
+
                 // ── Patched App Runtime Logs ──
                 PatchedAppRuntimeLogsSection(
                     mono = mono,

src/main/kotlin/app/morphe/gui/ui/screens/quick/QuickPatchScreen.kt

@@ -39,6 +39,7 @@ import cafe.adriel.voyager.core.screen.Screen
 import app.morphe.morphe_cli.generated.resources.Res
 import app.morphe.morphe_cli.generated.resources.morphe_dark
 import app.morphe.morphe_cli.generated.resources.morphe_light
+import app.morphe.gui.LocalAdbPreference
 import app.morphe.gui.data.model.Patch
 import app.morphe.gui.data.model.SupportedApp
 import app.morphe.gui.data.repository.ConfigRepository
@@ -1189,6 +1190,8 @@ private fun CompletedContent(
     val scope = rememberCoroutineScope()
     val adbManager = remember { AdbManager() }
     val monitorState by DeviceMonitor.state.collectAsState()
+    val adbPreference = LocalAdbPreference.current
+    val isAdbDisabledByUser = !adbPreference.enabled
     var isInstalling by remember { mutableStateOf(false) }
     var installError by remember { mutableStateOf<String?>(null) }
     var installSuccess by remember { mutableStateOf(false) }
@@ -1326,8 +1329,44 @@ private fun CompletedContent(
             }
         }
 
-        // ADB install
-        if (monitorState.isAdbAvailable == true) {
+        // ADB install — when the user has the toggle off, render a compact
+        // "ADB OFF" hint with an inline enable button rather than hiding the
+        // affordance entirely (otherwise users wonder where install went).
+        if (isAdbDisabledByUser) {
+            Spacer(modifier = Modifier.height(12.dp))
+            val enableHover = remember { MutableInteractionSource() }
+            val enableHovered by enableHover.collectIsHoveredAsState()
+            Box(
+                modifier = Modifier
+                    .widthIn(max = 480.dp)
+                    .fillMaxWidth()
+                    .height(38.dp)
+                    .hoverable(enableHover)
+                    .clip(RoundedCornerShape(corners.small))
+                    .border(
+                        1.dp,
+                        if (enableHovered) accents.primary.copy(alpha = 0.5f)
+                        else accents.primary.copy(alpha = 0.25f),
+                        RoundedCornerShape(corners.small)
+                    )
+                    .background(
+                        if (enableHovered) accents.primary.copy(alpha = 0.08f)
+                        else Color.Transparent,
+                        RoundedCornerShape(corners.small)
+                    )
+                    .clickable { adbPreference.onChange(true) },
+                contentAlignment = Alignment.Center
+            ) {
+                Text(
+                    text = "ADB OFF · ENABLE TO INSTALL",
+                    fontSize = 11.sp,
+                    fontWeight = FontWeight.Bold,
+                    fontFamily = mono,
+                    color = accents.primary,
+                    letterSpacing = 0.5.sp
+                )
+            }
+        } else if (monitorState.isAdbAvailable == true) {
             Spacer(modifier = Modifier.height(12.dp))
 
             val readyDevices = monitorState.devices.filter { it.isReady }