Migration to the new Android Embedding for the Plugin

android/build.gradle

@@ -2,7 +2,7 @@ group 'com.gianlucaparadise.flutter_cast_framework'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.2.71'
+    ext.kotlin_version = '1.5.31'
     repositories {
         google()
         jcenter()

android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

android/gradlew

@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+    
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"

android/gradlew.bat

@@ -0,0 +1,104 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto init
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto init
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:init
+@rem Get command-line arguments, handling Windows variants
+
+if not "%OS%" == "Windows_NT" goto win9xME_args
+
+:win9xME_args
+@rem Slurp the command line arguments.
+set CMD_LINE_ARGS=
+set _SKIP=2
+
+:win9xME_args_slurp
+if "x%~1" == "x" goto execute
+
+set CMD_LINE_ARGS=%*
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

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

@@ -1,48 +1,107 @@
 package com.gianlucaparadise.flutter_cast_framework
 
+import android.app.Activity
+import android.content.Context
 import android.util.Log
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleObserver
 import androidx.lifecycle.OnLifecycleEvent
 import androidx.lifecycle.ProcessLifecycleOwner
-import androidx.mediarouter.app.MediaRouteChooserDialog
-import androidx.mediarouter.app.MediaRouteControllerDialog
 import com.gianlucaparadise.flutter_cast_framework.cast.CastDialogOpener
 import com.gianlucaparadise.flutter_cast_framework.cast.MessageCastingChannel
 import com.google.android.gms.cast.framework.CastContext
 import com.google.android.gms.cast.framework.CastSession
 import com.google.android.gms.cast.framework.SessionManager
 import com.google.android.gms.cast.framework.SessionManagerListener
+import io.flutter.embedding.engine.plugins.FlutterPlugin
+import io.flutter.embedding.engine.plugins.activity.ActivityAware
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
+import io.flutter.plugin.common.BinaryMessenger
 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(private val registrar: Registrar, private val channel: MethodChannel) : MethodCallHandler, LifecycleObserver {
+
+class FlutterCastFrameworkPlugin : FlutterPlugin, MethodCallHandler, ActivityAware, LifecycleObserver {
     companion object {
         const val TAG = "AndroidCastPlugin"
 
         @JvmStatic
         fun registerWith(registrar: Registrar) {
-            val channel = MethodChannel(registrar.messenger(), "flutter_cast_framework")
+            val plugin = FlutterCastFrameworkPlugin()
-            channel.setMethodCallHandler(FlutterCastFrameworkPlugin(registrar, channel))
+            plugin.onAttachedToEngine(registrar.context(), registrar.messenger())
         }
     }
 
     init {
         ProcessLifecycleOwner.get().lifecycle.addObserver(this)
-
-        CastContext.getSharedInstance(registrar.activeContext()).addCastStateListener { i ->
-            Log.d(TAG, "Cast state changed: $i")
-            channel.invokeMethod(MethodNames.onCastStateChanged, i)
-        }
     }
 
+    //region FlutterPlugin interface
+    override fun onAttachedToEngine(binding: FlutterPlugin.FlutterPluginBinding) {
+        Log.d(TAG, "onAttachedToEngine")
+        onAttachedToEngine(binding.applicationContext, binding.binaryMessenger)
+    }
+
+    private fun onAttachedToEngine(applicationContext: Context, messenger: BinaryMessenger) {
+        this.applicationContext = applicationContext
+
+        val methodChannel = MethodChannel(messenger, "flutter_cast_framework")
+        methodChannel.setMethodCallHandler(this)
+        channel = methodChannel
+
+        mMessageCastingChannel = MessageCastingChannel(methodChannel)
+
+        CastContext.getSharedInstance(applicationContext).addCastStateListener { i ->
+            Log.d(TAG, "Cast state changed: $i")
+            methodChannel.invokeMethod(MethodNames.onCastStateChanged, i)
+        }
+
+        mSessionManager = CastContext.getSharedInstance(applicationContext).sessionManager
+        mCastSession = mSessionManager.currentCastSession
+    }
+
+    override fun onDetachedFromEngine(binding: FlutterPlugin.FlutterPluginBinding) {
+        Log.d(TAG, "onDetachedFromEngine")
+        applicationContext = null;
+        channel?.setMethodCallHandler(null);
+        channel = null;
+        mMessageCastingChannel = null
+    }
+    //endregion
+
+    //region ActivityAware
+    override fun onAttachedToActivity(binding: ActivityPluginBinding) {
+        Log.d(TAG, "onAttachedToActivity")
+        activity = binding.activity
+    }
+
+    override fun onDetachedFromActivityForConfigChanges() {
+        Log.d(TAG, "onDetachedFromActivityForConfigChanges")
+        activity = null
+    }
+
+    override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
+        Log.d(TAG, "onReattachedToActivityForConfigChanges")
+        activity = binding.activity
+    }
+
+    override fun onDetachedFromActivity() {
+        Log.d(TAG, "onDetachedFromActivity")
+        activity = null
+    }
+    //endregion
+
     private lateinit var mSessionManager: SessionManager
     private val mSessionManagerListener = CastSessionManagerListener()
 
-    private val mMessageCastingChannel = MessageCastingChannel(channel)
+    private var channel: MethodChannel? = null
+    private var applicationContext: Context? = null
+    private var activity: Activity? = null
+
+    private var mMessageCastingChannel: MessageCastingChannel? = null
 
     private var mCastSession: CastSession? = null
         set(value) {
@@ -53,14 +112,13 @@ class FlutterCastFrameworkPlugin(private val registrar: Registrar, private val c
 
             field = value
 
-            channel.invokeMethod(MethodNames.getSessionMessageNamespaces, null, result)
+            channel?.invokeMethod(MethodNames.getSessionMessageNamespaces, null, result)
         }
 
+    //region LifecycleObserver
     @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
     fun onCreate() {
         Log.d(TAG, "App: ON_CREATE")
-        mSessionManager = CastContext.getSharedInstance(registrar.activeContext()).sessionManager
-        mCastSession = mSessionManager.currentCastSession
     }
 
     @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
@@ -69,8 +127,13 @@ class FlutterCastFrameworkPlugin(private val registrar: Registrar, private val c
         mSessionManager.addSessionManagerListener(mSessionManagerListener, CastSession::class.java)
         mCastSession = mSessionManager.currentCastSession
 
-        val castState = CastContext.getSharedInstance(registrar.activeContext()).castState
+        val context = applicationContext
-        channel.invokeMethod(MethodNames.onCastStateChanged, castState)
+        if (context == null) {
+            Log.d(TAG, "App: ON_RESUME - missing context")
+            return
+        }
+        val castState = CastContext.getSharedInstance(context).castState
+        channel?.invokeMethod(MethodNames.onCastStateChanged, castState)
     }
 
     @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
@@ -83,14 +146,24 @@ class FlutterCastFrameworkPlugin(private val registrar: Registrar, private val c
         // I can't set this to null because I need the cast session to send commands from notification
         // mCastSession = null
     }
+    //endregion
 
     override fun onMethodCall(call: MethodCall, result: Result) {
         val method = call.method
         val arguments = call.arguments
 
         when (method) {
-            MethodNames.showCastDialog -> CastDialogOpener.showCastDialog(registrar)
+            MethodNames.showCastDialog -> {
-            MethodNames.sendMessage -> this.mMessageCastingChannel.sendMessage(mCastSession, arguments)
+                val context = applicationContext
+                val activity = this.activity
+                if (context == null || activity == null) {
+                    Log.d(TAG, "onMethodCall - missing context")
+                    return
+                }
+
+                CastDialogOpener.showCastDialog(context, activity)
+            }
+            MethodNames.sendMessage -> this.mMessageCastingChannel?.sendMessage(mCastSession, arguments)
             else -> result.notImplemented()
         }
     }
@@ -122,8 +195,7 @@ class FlutterCastFrameworkPlugin(private val registrar: Registrar, private val c
                 try {
                     oldSession?.removeMessageReceivedCallbacks(it)
                     newSession?.setMessageReceivedCallbacks(it, mMessageCastingChannel)
-                }
+                } catch (e: java.lang.Exception) {
-                catch (e: java.lang.Exception) {
                     Log.e(TAG, "Updating mCastSession - Exception while creating channel", e)
                 }
             }
@@ -134,56 +206,56 @@ class FlutterCastFrameworkPlugin(private val registrar: Registrar, private val c
         private var TAG = "SessionManagerListenerImpl"
 
         override fun onSessionSuspended(session: CastSession?, p1: Int) {
-            Log.d(TAG, "onSessionSuspended")
+            Log.d(TAG, "onSessionSuspended - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionSuspended, null)
+            channel?.invokeMethod(MethodNames.onSessionSuspended, null)
         }
 
         override fun onSessionStarting(session: CastSession?) {
-            Log.d(TAG, "onSessionStarting")
+            Log.d(TAG, "onSessionStarting - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionStarting, null)
+            channel?.invokeMethod(MethodNames.onSessionStarting, null)
 
             mCastSession = session
         }
 
         override fun onSessionResuming(session: CastSession?, p1: String?) {
-            Log.d(TAG, "onSessionResuming")
+            Log.d(TAG, "onSessionResuming - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionResuming, null)
+            channel?.invokeMethod(MethodNames.onSessionResuming, null)
 
             mCastSession = session
         }
 
         override fun onSessionEnding(session: CastSession?) {
-            Log.d(TAG, "onSessionEnding")
+            Log.d(TAG, "onSessionEnding - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionEnding, null)
+            channel?.invokeMethod(MethodNames.onSessionEnding, null)
         }
 
         override fun onSessionStartFailed(session: CastSession?, p1: Int) {
-            Log.d(TAG, "onSessionStartFailed")
+            Log.d(TAG, "onSessionStartFailed - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionStartFailed, null)
+            channel?.invokeMethod(MethodNames.onSessionStartFailed, null)
         }
 
         override fun onSessionResumeFailed(session: CastSession?, p1: Int) {
-            Log.d(TAG, "onSessionResumeFailed")
+            Log.d(TAG, "onSessionResumeFailed - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionResumeFailed, null)
+            channel?.invokeMethod(MethodNames.onSessionResumeFailed, null)
         }
 
         override fun onSessionStarted(session: CastSession, sessionId: String) {
-            Log.d(TAG, "onSessionStarted")
+            Log.d(TAG, "onSessionStarted - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionStarted, null)
+            channel?.invokeMethod(MethodNames.onSessionStarted, null)
 
             mCastSession = session
         }
 
         override fun onSessionResumed(session: CastSession, wasSuspended: Boolean) {
-            Log.d(TAG, "onSessionResumed")
+            Log.d(TAG, "onSessionResumed - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionResumed, null)
+            channel?.invokeMethod(MethodNames.onSessionResumed, null)
 
             mCastSession = session
         }
 
         override fun onSessionEnded(session: CastSession, error: Int) {
-            Log.d(TAG, "onSessionEnded")
+            Log.d(TAG, "onSessionEnded - channel is null? ${channel == null}")
-            channel.invokeMethod(MethodNames.onSessionEnded, null)
+            channel?.invokeMethod(MethodNames.onSessionEnded, null)
         }
     }
 }

android/src/main/kotlin/com/gianlucaparadise/flutter_cast_framework/cast/CastDialogOpener.kt

@@ -1,5 +1,7 @@
 package com.gianlucaparadise.flutter_cast_framework.cast
 
+import android.app.Activity
+import android.content.Context
 import android.util.Log
 import androidx.mediarouter.app.MediaRouteChooserDialog
 import androidx.mediarouter.app.MediaRouteControllerDialog
@@ -8,21 +10,20 @@ import com.google.android.gms.cast.framework.CastContext
 import io.flutter.plugin.common.PluginRegistry
 
 object CastDialogOpener {
-    fun showCastDialog(registrar: PluginRegistry.Registrar) {
+    fun showCastDialog(applicationContext: Context, activity: Activity) {
-        val castContext = CastContext.getSharedInstance(registrar.activeContext())
+        val castContext = CastContext.getSharedInstance(applicationContext)
         val castSession = castContext.sessionManager.currentCastSession
 
-        val activity = 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)
+                MediaRouteControllerDialog(applicationContext, themeResId)
                         .show()
             } else {
                 // This dialog allows the user to choose a route that matches a given selector.
-                MediaRouteChooserDialog(registrar.activeContext(), themeResId).apply {
+                MediaRouteChooserDialog(applicationContext, themeResId).apply {
                     routeSelector = castContext.mergedSelector
                     show()
                 }

example/.flutter-plugins-dependencies

@@ -1 +1 @@
-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_cast_framework","path":"/Users/gianluca.paradiso/mydev/cast-your-instructions/flutter_cast_framework/","dependencies":[]}],"android":[{"name":"flutter_cast_framework","path":"/Users/gianluca.paradiso/mydev/cast-your-instructions/flutter_cast_framework/","dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"flutter_cast_framework","dependencies":[]}],"date_created":"2021-09-24 07:06:05.488267","version":"2.5.1"}
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_cast_framework","path":"/Users/gianluca.paradiso/mydev/cast-your-instructions/flutter_cast_framework/","dependencies":[]}],"android":[{"name":"flutter_cast_framework","path":"/Users/gianluca.paradiso/mydev/cast-your-instructions/flutter_cast_framework/","dependencies":[]}],"macos":[],"linux":[],"windows":[],"web":[]},"dependencyGraph":[{"name":"flutter_cast_framework","dependencies":[]}],"date_created":"2021-09-26 17:19:53.237182","version":"2.5.1"}