Fixes #30, added quick settings icon.

app/src/main/java/eu/neilalexander/yggdrasil/YggTileService.kt

@@ -0,0 +1,107 @@
+package eu.neilalexander.yggdrasil
+
+import android.content.Intent
+import android.graphics.drawable.Icon
+import android.os.Build
+import android.os.IBinder
+import android.service.quicksettings.Tile
+import android.service.quicksettings.TileService
+import android.util.Log
+import androidx.annotation.RequiresApi
+
+private const val TAG = "TileService"
+
+@RequiresApi(Build.VERSION_CODES.N)
+class YggTileService: TileService(), YggStateReceiver.StateReceiver {
+
+    private lateinit var receiver: YggStateReceiver
+
+    override fun onCreate() {
+        super.onCreate()
+        receiver = YggStateReceiver(this)
+    }
+
+    /**
+     * We need to override the method onBind to avoid crashes that were detected on Android 8
+     *
+     * The possible reason of crashes is described here:
+     * https://github.com/aosp-mirror/platform_frameworks_base/commit/ee68fd889c2dfcd895b8e73fc39d7b97826dc3d8
+     */
+    override fun onBind(intent: Intent?): IBinder? {
+        return try {
+            super.onBind(intent)
+        } catch (th: Throwable) {
+            null
+        }
+    }
+
+    override fun onTileAdded() {
+        super.onTileAdded()
+        updateTileState((application as GlobalApplication).getCurrentState())
+    }
+
+    override fun onTileRemoved() {
+        super.onTileRemoved()
+        updateTileState((application as GlobalApplication).getCurrentState())
+    }
+
+    override fun onStartListening() {
+        super.onStartListening()
+        receiver.register(this)
+        updateTileState((application as GlobalApplication).getCurrentState())
+    }
+
+    override fun onStopListening() {
+        super.onStopListening()
+        receiver.unregister(this)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        receiver.unregister(this)
+    }
+
+    override fun onClick() {
+        super.onClick()
+        val intent = Intent(this, PacketTunnelProvider::class.java)
+        intent.action = PacketTunnelProvider.ACTION_TOGGLE
+        startService(intent)
+    }
+
+    private fun updateTileState(state: State) {
+        val tile = qsTile ?: return
+        val oldState = tile.state
+        tile.state = when (state) {
+            State.Unknown -> Tile.STATE_UNAVAILABLE
+            State.Disabled -> Tile.STATE_INACTIVE
+            State.Enabled -> Tile.STATE_ACTIVE
+            State.Connected -> Tile.STATE_ACTIVE
+            State.Reconnecting -> Tile.STATE_ACTIVE
+        }
+        var changed = oldState != tile.state
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+            val oldText = tile.subtitle
+            tile.subtitle = when (state) {
+                State.Enabled -> getText(R.string.tile_enabled)
+                State.Connected -> getText(R.string.tile_connected)
+                else -> getText(R.string.tile_disabled)
+            }
+            changed = changed || (oldText != tile.subtitle)
+        }
+
+        // Update tile if changed state
+        if (changed) {
+            Log.i(TAG, "Updating tile, old state: $oldState, new state: ${tile.state}")
+            /*
+              Force set the icon in the tile, because there is a problem on icon tint in the Android Oreo.
+              Issue: https://github.com/AdguardTeam/AdguardForAndroid/issues/1996
+             */
+            tile.icon = Icon.createWithResource(applicationContext, R.drawable.ic_tile_icon)
+            tile.updateTile()
+        }
+    }
+
+    override fun onStateChange(state: State) {
+        updateTileState(state)
+    }
+}