Add android stats channel

android/app/src/main/kotlin/com/hiddify/hiddify/MainActivity.kt

@@ -49,6 +49,7 @@ class MainActivity : FlutterFragmentActivity(), ServiceConnection.Callback {
         flutterEngine.plugins.add(EventHandler())
         flutterEngine.plugins.add(LogHandler())
         flutterEngine.plugins.add(GroupsChannel(lifecycleScope))
+        flutterEngine.plugins.add(StatsChannel(lifecycleScope))
     }
 
     fun reconnect() {

android/app/src/main/kotlin/com/hiddify/hiddify/StatsChannel.kt

@@ -0,0 +1,64 @@
+package com.hiddify.hiddify
+
+import android.util.Log
+import com.hiddify.hiddify.utils.CommandClient
+import io.flutter.embedding.engine.plugins.FlutterPlugin
+import io.flutter.plugin.common.EventChannel
+import io.flutter.plugin.common.JSONMethodCodec
+import io.nekohasekai.libbox.StatusMessage
+import kotlinx.coroutines.CoroutineScope
+
+class StatsChannel(private val scope: CoroutineScope) : FlutterPlugin, CommandClient.Handler{
+    companion object {
+        const val TAG = "A/StatsChannel"
+        const val STATS_CHANNEL = "com.hiddify.app/stats"
+    }
+
+    private val commandClient =
+            CommandClient(scope, CommandClient.ConnectionType.Status, this)
+
+    private var statsChannel: EventChannel? = null
+    private var statsEvent: EventChannel.EventSink? = null
+
+    override fun updateStatus(status: StatusMessage) {
+        MainActivity.instance.runOnUiThread {
+            val map = listOf(
+                    Pair("connections-in", status.connectionsIn),
+                    Pair("connections-out", status.connectionsOut),
+                    Pair("uplink", status.uplink),
+                    Pair("downlink", status.downlink),
+                    Pair("uplink-total", status.uplinkTotal),
+                    Pair("downlink-total", status.downlinkTotal)
+            ).associate { it.first to it.second }
+            statsEvent?.success(map)
+        }
+    }
+
+    override fun onAttachedToEngine(flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
+        statsChannel = EventChannel(
+                flutterPluginBinding.binaryMessenger,
+                STATS_CHANNEL,
+                JSONMethodCodec.INSTANCE
+        )
+
+        statsChannel!!.setStreamHandler(object : EventChannel.StreamHandler {
+            override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
+                statsEvent = events
+                Log.d(TAG, "connecting stats command client")
+                commandClient.connect()
+            }
+
+            override fun onCancel(arguments: Any?) {
+                statsEvent = null
+                Log.d(TAG, "disconnecting stats command client")
+                commandClient.disconnect()
+            }
+        })
+    }
+
+    override fun onDetachedFromEngine(binding: FlutterPlugin.FlutterPluginBinding) {
+        statsEvent = null
+        commandClient.disconnect()
+        statsChannel?.setStreamHandler(null)
+    }
+}