Fix ANR caused by temp hotspot

Fixes #126.

README.md

@@ -138,6 +138,7 @@ Non-public API list:
 * (since API 24) [`Landroid/net/ConnectivityManager;->stopTethering(I)V,system-api,whitelist`](https://android.googlesource.com/platform/prebuilts/runtime/+/3d07e5c/appcompat/hiddenapi-flags.csv#123410)
 * (since API 23) [`Landroid/net/wifi/WifiConfiguration;->apBand:I,greylist`](https://android.googlesource.com/platform/prebuilts/runtime/+/3d07e5c/appcompat/hiddenapi-flags.csv#131529)
 * (since API 23) [`Landroid/net/wifi/WifiConfiguration;->apChannel:I,greylist`](https://android.googlesource.com/platform/prebuilts/runtime/+/3d07e5c/appcompat/hiddenapi-flags.csv#131530)
+* (since API 26) [`Landroid/net/wifi/WifiManager;->cancelLocalOnlyHotspotRequest()V,greylist`](https://android.googlesource.com/platform/prebuilts/runtime/+/3d07e5c/appcompat/hiddenapi-flags.csv#132250)
 * [`Landroid/net/wifi/WifiManager;->getWifiApConfiguration()Landroid/net/wifi/WifiConfiguration;,system-api,whitelist`](https://android.googlesource.com/platform/prebuilts/runtime/+/3d07e5c/appcompat/hiddenapi-flags.csv#132289)
 * [`Landroid/net/wifi/WifiManager;->setWifiApConfiguration(Landroid/net/wifi/WifiConfiguration;)Z,system-api,whitelist`](https://android.googlesource.com/platform/prebuilts/runtime/+/3d07e5c/appcompat/hiddenapi-flags.csv#132358)
 * (deprecated since API 26) `Landroid/net/wifi/WifiManager;->setWifiApEnabled(Landroid/net/wifi/WifiConfiguration;Z)Z`

mobile/src/main/java/be/mygod/vpnhotspot/LocalOnlyHotspotService.kt

@@ -13,6 +13,7 @@ import be.mygod.vpnhotspot.net.TetheringManager
 import be.mygod.vpnhotspot.net.TetheringManager.localOnlyTetheredIfaces
 import be.mygod.vpnhotspot.net.monitor.IpNeighbourMonitor
 import be.mygod.vpnhotspot.net.monitor.TetherTimeoutMonitor
+import be.mygod.vpnhotspot.net.wifi.WifiApManager
 import be.mygod.vpnhotspot.util.StickyEvent1
 import be.mygod.vpnhotspot.util.broadcastReceiver
 import be.mygod.vpnhotspot.widget.SmartSnackbar
@@ -38,7 +39,17 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
 
         val configuration get() = reservation?.wifiConfiguration
 
-        fun stop() = reservation?.close()
+        fun stop() = when (iface) {
+            null -> { } // stopped
+            "" -> {
+                WifiApManager.cancelLocalOnlyHotspotRequest()
+                reservation?.close()
+                updateNotification()
+                stopService()
+                iface = null
+            }
+            else -> reservation!!.close()
+        }
     }
 
     private val binder = Binder()
@@ -59,11 +70,7 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
         check(ifaces.size <= 1)
         val iface = ifaces.singleOrNull()
         binder.iface = iface
-        if (iface.isNullOrEmpty()) {
-            unregisterReceiver()
-            ServiceNotification.stopForeground(this)
-            stopSelf()
-        } else launch {
+        if (iface.isNullOrEmpty()) stopService() else launch {
             val routingManager = routingManager
             if (routingManager == null) {
                 this@LocalOnlyHotspotService.routingManager = RoutingManager.LocalOnly(this@LocalOnlyHotspotService,
@@ -72,7 +79,7 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
             } else check(iface == routingManager.downstream)
         }
     }
-    override val activeIfaces get() = listOfNotNull(binder.iface)
+    override val activeIfaces get() = binder.iface.let { if (it.isNullOrEmpty()) emptyList() else listOf(it) }
 
     override fun onBind(intent: Intent?) = binder
 
@@ -80,7 +87,9 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
         if (binder.iface != null) return START_STICKY
         binder.iface = ""
         // show invisible foreground notification on television to avoid being killed
-        if (app.uiMode.currentModeType == Configuration.UI_MODE_TYPE_TELEVISION) updateNotification()
+        // or for bug with airplane mode on API 28-: https://issuetracker.google.com/issues/128350148
+        if (app.uiMode.currentModeType == Configuration.UI_MODE_TYPE_TELEVISION ||
+                Build.VERSION.SDK_INT < 29) updateNotification()
         // throws IllegalStateException if the caller attempts to start the LocalOnlyHotspot while they
         // have an outstanding request.
         // https://android.googlesource.com/platform/frameworks/opt/net/wifi/+/53e0284/service/java/com/android/server/wifi/WifiServiceImpl.java#1192
@@ -147,6 +156,12 @@ class LocalOnlyHotspotService : IpNeighbourMonitoringService(), CoroutineScope {
         super.onDestroy()
     }
 
+    private fun stopService() {
+        unregisterReceiver()
+        ServiceNotification.stopForeground(this)
+        stopSelf()
+    }
+
     private fun unregisterReceiver(exit: Boolean = false) {
         if (receiverRegistered) {
             unregisterReceiver(receiver)

mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotManager.kt

@@ -79,7 +79,6 @@ class LocalOnlyHotspotManager(private val parent: TetheringFragment) : Manager()
             return lookup[binder?.iface ?: return ""]?.formatAddresses() ?: ""
         }
         override val active get() = binder?.iface != null
-        override val enabled get() = binder?.iface != ""
         override val selectable get() = active
     }
 

mobile/src/main/java/be/mygod/vpnhotspot/manage/LocalOnlyHotspotTileService.kt

@@ -31,10 +31,10 @@ class LocalOnlyHotspotTileService : KillableTileService() {
 
     override fun onClick() {
         val binder = binder
-        if (binder == null) tapPending = true
-        else when (binder.iface) {
-            null -> ContextCompat.startForegroundService(this, Intent(this, LocalOnlyHotspotService::class.java))
-            "" -> { }   // STARTING, ignored
+        when {
+            binder == null -> tapPending = true
+            binder.iface == null -> ContextCompat.startForegroundService(this,
+                    Intent(this, LocalOnlyHotspotService::class.java))
             else -> binder.stop()
         }
     }
@@ -44,20 +44,13 @@ class LocalOnlyHotspotTileService : KillableTileService() {
         service.ifaceChanged[this] = {
             qsTile?.run {
                 icon = tile
-                when (it) {
-                    null -> {
+                if (it.isNullOrEmpty()) {
                     state = Tile.STATE_INACTIVE
                     label = getText(R.string.tethering_temp_hotspot)
-                    }
-                    "" -> {
-                        state = Tile.STATE_UNAVAILABLE
-                        label = getText(R.string.tethering_temp_hotspot)
-                    }
-                    else -> {
+                } else {
                     state = Tile.STATE_ACTIVE
                     label = service.configuration?.SSID ?: getText(R.string.tethering_temp_hotspot)
                 }
-                }
                 updateTile()
             }
         }

mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/WifiApManager.kt

@@ -17,6 +17,11 @@ object WifiApManager {
             }
         }
 
+    private val cancelLocalOnlyHotspotRequest by lazy {
+        WifiManager::class.java.getDeclaredMethod("cancelLocalOnlyHotspotRequest")
+    }
+    fun cancelLocalOnlyHotspotRequest() = cancelLocalOnlyHotspotRequest.invoke(app.wifi)
+
     private val setWifiApEnabled by lazy {
         WifiManager::class.java.getDeclaredMethod("setWifiApEnabled",
                 WifiConfiguration::class.java, Boolean::class.java)