Show dialog on click

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

@@ -1,6 +1,8 @@
 package com.gianlucaparadise.flutter_cast_framework
 
 import android.util.Log
+import androidx.mediarouter.app.MediaRouteChooserDialog
+import androidx.mediarouter.app.MediaRouteControllerDialog
 import com.google.android.gms.cast.framework.CastContext
 import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
@@ -8,8 +10,14 @@ import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
 import io.flutter.plugin.common.PluginRegistry.Registrar
 
-class FlutterCastFrameworkPlugin(registrar: Registrar, private val channel: MethodChannel): MethodCallHandler {
+class FlutterCastFrameworkPlugin(private val registrar: Registrar, private val channel: MethodChannel) : MethodCallHandler {
     companion object {
+        const val TAG = "AndroidCastPlugin"
+
+        // @StyleRes
+        // var customStyleResId: Int? = null
+        // private val themeResId get() = customStyleResId ?: R.style.Theme_AppCompat_DayNight_Dialog_Alert
+
         @JvmStatic
         fun registerWith(registrar: Registrar) {
             val channel = MethodChannel(registrar.messenger(), "flutter_cast_framework")
@@ -19,16 +27,42 @@ class FlutterCastFrameworkPlugin(registrar: Registrar, private val channel: Meth
 
     init {
         CastContext.getSharedInstance(registrar.activeContext()).addCastStateListener { i ->
-      Log.d("Android", "Method call on flutter: $i")
+            Log.d(TAG, "Cast state changed: $i")
             channel.invokeMethod("onCastStateChanged", i)
         }
     }
 
     override fun onMethodCall(call: MethodCall, result: Result) {
-    if (call.method == "getPlatformVersion") {
+        when (call.method) {
-      result.success("Android ${android.os.Build.VERSION.RELEASE}")
+            "showCastDialog" -> showCastDialog()
+            else -> result.notImplemented()
+        }
+    }
+
+    private fun showCastDialog() {
+        val castContext = CastContext.getSharedInstance(registrar.activeContext())
+        val castSession = castContext.sessionManager.currentCastSession
+
+        val activity = this.registrar.activity()
+        val themeResId = activity.packageManager.getActivityInfo(activity.componentName, 0).themeResource
+
+        try {
+            if (castSession != null) {
+                // This dialog allows the user to control or disconnect from the currently selected route.
+                MediaRouteControllerDialog(registrar.activeContext(), themeResId)
+                        .show()
             } else {
-      result.notImplemented()
+                // This dialog allows the user to choose a route that matches a given selector.
+                MediaRouteChooserDialog(registrar.activeContext(), themeResId).apply {
+                    routeSelector = castContext.mergedSelector
+                    show()
+                }
+            }
+        } catch (ex: IllegalArgumentException) {
+            Log.d(TAG, "Exception while opening Dialog")
+            throw IllegalArgumentException("Error while opening MediaRouteDialog." +
+                    " Did you use AppCompat theme on your activity?" +
+                    " Check https://developers.google.com/cast/docs/android_sender/integrate#androidtheme", ex)
         }
     }
 }

example/android/app/build.gradle

@@ -62,6 +62,8 @@ flutter {
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     testImplementation 'junit:junit:4.12'
+    implementation 'androidx.appcompat:appcompat:1.1.0'
+
     androidTestImplementation 'androidx.test:runner:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
 }

example/android/app/src/main/res/values/styles.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+    <style name="LaunchTheme" parent="@style/Theme.AppCompat">
         <!-- Show a splash screen on the activity. Automatically removed when
              Flutter draws its first frame -->
         <item name="android:windowBackground">@drawable/launch_background</item>

example/lib/main.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_cast_framework/cast/CastContext.dart';
-import 'package:flutter_cast_framework/cast/widget/CastButton.dart';
+import 'package:flutter_cast_framework/cast/widgets/CastButton.dart';
 import 'package:flutter_cast_framework/flutter_cast_framework.dart';
 
 void main() => runApp(MyApp());
@@ -20,6 +20,7 @@ class _MyAppState extends State<MyApp> {
   }
 
   void _onCastStateChanged() {
+    debugPrint("Cast state changed from example");
     setState(() {
       _castState = FlutterCastFramework.castContext.state.value;
     });
@@ -34,12 +35,8 @@ class _MyAppState extends State<MyApp> {
         ),
         body: Center(
             child: Column(
-            children: [
+          children: [Text('Cast State: $_castState'), CastButton()],
-              Text('Cast State: $_castState'),
+        )),
-              CastButton()
-            ],
-          )
-        ),
       ),
     );
   }

lib/cast/CastContext.dart

@@ -1,13 +1,16 @@
 import 'package:flutter/foundation.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_cast_framework/flutter_cast_framework.dart';
 
 class CastContext {
-  static final _instance = new CastContext._internal();
-
-  CastContext._internal();
-
-  static CastContext get instance => _instance;
-
   final ValueNotifier<CastState> state = ValueNotifier(CastState.unavailable);
+  final MethodChannel _channel;
+
+  CastContext(this._channel);
+
+  void showCastChooserDialog() {
+    _channel.invokeMethod(MethodNames.showCastDialog);
+  }
 }
 
 enum CastState {

lib/cast/widget/CastButton.dart

@@ -1,12 +0,0 @@
-import 'package:flutter/widgets.dart';
-import 'package:flutter_cast_framework/cast/widget/CastIcon.dart';
-
-class CastButton extends StatelessWidget {
-  @override
-  Widget build(BuildContext context) {
-    return GestureDetector(
-      child: CastIcon(),
-      onTap: () => debugPrint("Clicked"),
-    );
-  }
-}

lib/cast/widgets/CastButton.dart

@@ -0,0 +1,12 @@
+import 'package:flutter/widgets.dart';
+import 'package:flutter_cast_framework/cast/widgets/CastIcon.dart';
+import 'package:flutter_cast_framework/flutter_cast_framework.dart';
+
+class CastButton extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return GestureDetector(
+        child: CastIcon(),
+        onTap: () => FlutterCastFramework.castContext.showCastChooserDialog());
+  }
+}

lib/flutter_cast_framework.dart

@@ -2,11 +2,17 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_cast_framework/cast/CastContext.dart';
 
-class FlutterCastFramework {
+class MethodNames {
+  static const onCastStateChanged = "onCastStateChanged";
+  static const showCastDialog = "showCastDialog";
+}
 
-  static const MethodChannel _channel = const MethodChannel('flutter_cast_framework');
+class FlutterCastFramework {
+  static const MethodChannel _channel =
+      const MethodChannel('flutter_cast_framework');
 
   static bool _isInitiated = false;
+
   static _init() {
     _channel.setMethodCallHandler((MethodCall call) async {
       String method = call.method;
@@ -14,7 +20,7 @@ class FlutterCastFramework {
       debugPrint("Method call on flutter: $method $arguments");
 
       switch (method) {
-        case "onCastStateChanged":
+        case MethodNames.onCastStateChanged:
           int castState = arguments;
           castContext.state.value = CastState.values[castState];
           break;
@@ -26,9 +32,16 @@ class FlutterCastFramework {
     });
   }
 
+  static CastContext _castContext;
+
   // This must be the plugin entry point
   static CastContext get castContext {
-    if (!_isInitiated) _init();
+    if (!_isInitiated || _castContext == null) {
-    return CastContext.instance;
+      _castContext = CastContext(_channel);
+      // TODO: find a better way to init the plugin
+      _isInitiated = true;
+      _init();
+    }
+    return _castContext;
   }
 }