Initial CastContext setup;

CastState handling

android/src/main/kotlin/com/gianlucaparadise/flutter_cast_framework/FlutterCastFrameworkPlugin.kt

@@ -1,17 +1,26 @@
 package com.gianlucaparadise.flutter_cast_framework
 
+import android.util.Log
+import com.google.android.gms.cast.framework.CastContext
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
 import io.flutter.plugin.common.PluginRegistry.Registrar
 
-class FlutterCastFrameworkPlugin: MethodCallHandler {
+class FlutterCastFrameworkPlugin(registrar: Registrar, private val channel: MethodChannel): MethodCallHandler {
   companion object {
     @JvmStatic
     fun registerWith(registrar: Registrar) {
       val channel = MethodChannel(registrar.messenger(), "flutter_cast_framework")
-      channel.setMethodCallHandler(FlutterCastFrameworkPlugin())
+      channel.setMethodCallHandler(FlutterCastFrameworkPlugin(registrar, channel))
+    }
+  }
+
+  init {
+    CastContext.getSharedInstance(registrar.activeContext()).addCastStateListener { i ->
+      Log.d("Android", "Method call on flutter: $i")
+      channel.invokeMethod("onCastStateChanged", i)
     }
   }
 

example/lib/main.dart

@@ -1,7 +1,5 @@
 import 'package:flutter/material.dart';
-import 'dart:async';
-
-import 'package:flutter/services.dart';
+import 'package:flutter_cast_framework/cast/CastContext.dart';
 import 'package:flutter_cast_framework/flutter_cast_framework.dart';
 
 void main() => runApp(MyApp());
@@ -12,31 +10,17 @@ class MyApp extends StatefulWidget {
 }
 
 class _MyAppState extends State<MyApp> {
-  String _platformVersion = 'Unknown';
+  CastState _castState;
 
   @override
   void initState() {
     super.initState();
-    initPlatformState();
+    FlutterCastFramework.castContext.state.addListener(_onCastStateChanged);
   }
 
-  // Platform messages are asynchronous, so we initialize in an async method.
-  Future<void> initPlatformState() async {
-    String platformVersion;
-    // Platform messages may fail, so we use a try/catch PlatformException.
-    try {
-      platformVersion = await FlutterCastFramework.platformVersion;
-    } on PlatformException {
-      platformVersion = 'Failed to get platform version.';
-    }
-
-    // If the widget was removed from the tree while the asynchronous platform
-    // message was in flight, we want to discard the reply rather than calling
-    // setState to update our non-existent appearance.
-    if (!mounted) return;
-
+  void _onCastStateChanged() {
     setState(() {
-      _platformVersion = platformVersion;
+      _castState = FlutterCastFramework.castContext.state.value;
     });
   }
 
@@ -48,7 +32,7 @@ class _MyAppState extends State<MyApp> {
           title: const Text('Cast plugin example app'),
         ),
         body: Center(
-          child: Text('Running on: $_platformVersion\n'),
+          child: Text('Cast State: $_castState'),
         ),
       ),
     );

lib/cast/CastContext.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/foundation.dart';
+
+class CastContext {
+  static final _instance = new CastContext._internal();
+
+  CastContext._internal();
+
+  static CastContext get instance => _instance;
+
+  final ValueNotifier<CastState> state = ValueNotifier(CastState.unavailable);
+}
+
+enum CastState {
+  default_state, // 0
+  unavailable, // 1
+  unconnected, // 2
+  connecting, // 3
+  connected, // 4
+}

lib/flutter_cast_framework.dart

@@ -1,13 +1,34 @@
-import 'dart:async';
-
+import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_cast_framework/cast/CastContext.dart';
 
 class FlutterCastFramework {
-  static const MethodChannel _channel =
-      const MethodChannel('flutter_cast_framework');
 
-  static Future<String> get platformVersion async {
-    final String version = await _channel.invokeMethod('getPlatformVersion');
-    return version;
+  static const MethodChannel _channel = const MethodChannel('flutter_cast_framework');
+
+  static bool _isInitiated = false;
+  static _init() {
+    _channel.setMethodCallHandler((MethodCall call) async {
+      String method = call.method;
+      dynamic arguments = call.arguments;
+      debugPrint("Method call on flutter: $method $arguments");
+
+      switch (method) {
+        case "onCastStateChanged":
+          int castState = arguments;
+          castContext.state.value = CastState.values[castState];
+          break;
+
+        default:
+          debugPrint("Method not handled: $method");
+          break;
+      }
+    });
+  }
+
+  // This must be the plugin entry point
+  static CastContext get castContext {
+    if (!_isInitiated) _init();
+    return CastContext.instance;
   }
 }

test/flutter_cast_framework_test.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter_cast_framework/flutter_cast_framework.dart';
 
 void main() {
   const MethodChannel channel = MethodChannel('flutter_cast_framework');
@@ -16,6 +15,6 @@ void main() {
   });
 
   test('getPlatformVersion', () async {
-    expect(await FlutterCastFramework.platformVersion, '42');
+    // expect(await FlutterCastFramework.platformVersion, '42');
   });
 }