refactor: handle MapView Lifecycle

app/src/main/java/com/geeksville/mesh/ui/map/MapFragment.kt

@@ -57,7 +57,7 @@ import com.geeksville.mesh.ui.map.components.CacheLayout
 import com.geeksville.mesh.ui.map.components.DownloadButton
 import com.geeksville.mesh.ui.map.components.EditWaypointDialog
 import com.geeksville.mesh.ui.components.IconButton
-import com.geeksville.mesh.util.EnableWakeLock
+import com.geeksville.mesh.ui.map.components.rememberMapViewWithLifecycle
 import com.geeksville.mesh.util.SqlTileWriterExt
 import com.geeksville.mesh.util.requiredZoomLevel
 import com.geeksville.mesh.util.formatAgo
@@ -147,13 +147,7 @@ fun MapView(model: UIViewModel = viewModel()) {
 
     val hasGps = context.hasGps()
 
-    EnableWakeLock(context)
-
-    val map = remember {
-        MapView(context).apply {
-            clipToOutline = true
-        }
-    }
+    val map = rememberMapViewWithLifecycle(context)
 
     fun toggleMyLocation() {
         if (context.gpsDisabled()) {

app/src/main/java/com/geeksville/mesh/ui/map/components/MapViewWithLifecycle.kt

@@ -1,14 +1,16 @@
-package com.geeksville.mesh.util
+package com.geeksville.mesh.ui.map.components
 
 import android.annotation.SuppressLint
 import android.content.Context
 import android.os.PowerManager
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.remember
 import androidx.compose.ui.platform.LocalLifecycleOwner
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
 import com.geeksville.mesh.android.BuildUtils.errormsg
+import org.osmdroid.views.MapView
 
 @SuppressLint("WakelockTimeout")
 private fun PowerManager.WakeLock.safeAcquire() {
@@ -29,23 +31,35 @@ private fun PowerManager.WakeLock.safeRelease() {
     }
 }
 
-@SuppressLint("InvalidWakeLockTag")
 @Composable
-fun EnableWakeLock(context: Context) {
+fun rememberMapViewWithLifecycle(context: Context): MapView {
+    val mapView = remember {
+        MapView(context).apply {
+            clipToOutline = true
+        }
+    }
     val lifecycle = LocalLifecycleOwner.current.lifecycle
-
-    DisposableEffect(Unit) {
+    DisposableEffect(lifecycle) {
         val powerManager = context.getSystemService(Context.POWER_SERVICE) as PowerManager
 
         @Suppress("DEPRECATION")
+        @SuppressLint("InvalidWakeLockTag")
         val wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "ScreenLock")
 
         wakeLock.safeAcquire()
 
         val observer = LifecycleEventObserver { _, event ->
             when (event) {
-                Lifecycle.Event.ON_PAUSE -> wakeLock.safeRelease()
-                Lifecycle.Event.ON_RESUME -> wakeLock.safeAcquire()
+                Lifecycle.Event.ON_PAUSE -> {
+                    wakeLock.safeRelease()
+                    mapView.onPause()
+                }
+
+                Lifecycle.Event.ON_RESUME -> {
+                    wakeLock.safeAcquire()
+                    mapView.onResume()
+                }
+
                 else -> {}
             }
         }
@@ -55,6 +69,8 @@ fun EnableWakeLock(context: Context) {
         onDispose {
             lifecycle.removeObserver(observer)
             wakeLock.safeRelease()
+            mapView.onDetach()
         }
     }
+    return mapView
 }