Feat: v2 embedding

android/build.gradle

@@ -2,14 +2,14 @@ group 'com.builttoroam.devicecalendar'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.3.41'
+    ext.kotlin_version = '1.3.50'
     repositories {
         google()
         jcenter()
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.2'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
@@ -25,7 +25,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'

android/src/main/kotlin/com/builttoroam/devicecalendar/CalendarDelegate.kt

@@ -68,9 +68,9 @@ import com.builttoroam.devicecalendar.models.*
 import com.builttoroam.devicecalendar.models.Calendar
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.PluginRegistry
-import io.flutter.plugin.common.PluginRegistry.Registrar
 import kotlinx.coroutines.*
 import org.dmfs.rfc5545.DateTime
 import org.dmfs.rfc5545.Weekday
@@ -92,14 +92,14 @@ class CalendarDelegate : PluginRegistry.RequestPermissionsResultListener {
     private val BYSETPOS_PART = "BYSETPOS"
 
     private val _cachedParametersMap: MutableMap<Int, CalendarMethodsParametersCacheModel> = mutableMapOf()
-    private var _registrar: Registrar? = null
+    private var _binding: ActivityPluginBinding? = null
     private var _context: Context? = null
     private var _gson: Gson? = null
 
     private val uiThreadHandler = Handler(Looper.getMainLooper())
 
-    constructor(registrar: Registrar?, context: Context) {
-        _registrar = registrar
+    constructor(binding: ActivityPluginBinding?, context: Context) {
+        _binding = binding
         _context = context
         val gsonBuilder = GsonBuilder()
         gsonBuilder.registerTypeAdapter(RecurrenceFrequency::class.java, RecurrenceFrequencySerializer())
@@ -652,8 +652,8 @@ class CalendarDelegate : PluginRegistry.RequestPermissionsResultListener {
 
     private fun arePermissionsGranted(): Boolean {
         if (atLeastAPI(23)) {
-            val writeCalendarPermissionGranted = _registrar!!.context().checkSelfPermission(Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED
-            val readCalendarPermissionGranted = _registrar!!.context().checkSelfPermission(Manifest.permission.READ_CALENDAR) == PackageManager.PERMISSION_GRANTED
+            val writeCalendarPermissionGranted = _binding!!.activity.checkSelfPermission(Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED
+            val readCalendarPermissionGranted = _binding!!.activity.checkSelfPermission(Manifest.permission.READ_CALENDAR) == PackageManager.PERMISSION_GRANTED
             return writeCalendarPermissionGranted && readCalendarPermissionGranted
         }
 
@@ -667,7 +667,7 @@ class CalendarDelegate : PluginRegistry.RequestPermissionsResultListener {
 
     private fun requestPermissions(requestCode: Int) {
         if (atLeastAPI(23)) {
-            _registrar!!.activity().requestPermissions(arrayOf(Manifest.permission.WRITE_CALENDAR, Manifest.permission.READ_CALENDAR), requestCode)
+            _binding!!.activity.requestPermissions(arrayOf(Manifest.permission.WRITE_CALENDAR, Manifest.permission.READ_CALENDAR), requestCode)
         }
     }
 

android/src/main/kotlin/com/builttoroam/devicecalendar/DeviceCalendarPlugin.kt

@@ -1,19 +1,32 @@
 package com.builttoroam.devicecalendar
 
+import android.app.Activity
 import android.content.Context
+import androidx.annotation.NonNull
 import com.builttoroam.devicecalendar.common.Constants
 import com.builttoroam.devicecalendar.common.DayOfWeek
 import com.builttoroam.devicecalendar.common.RecurrenceFrequency
 import com.builttoroam.devicecalendar.models.*
+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.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
 
 const val CHANNEL_NAME = "plugins.builttoroam.com/device_calendar"
 
-class DeviceCalendarPlugin() : MethodCallHandler {
+class DeviceCalendarPlugin() : FlutterPlugin, MethodCallHandler, ActivityAware {
+
+    /// The MethodChannel that will the communication between Flutter and native Android
+    ///
+    /// This local reference serves to register the plugin with the Flutter Engine and unregister it
+    /// when the Flutter Engine is detached from the Activity
+    private lateinit var channel: MethodChannel
+    private var context: Context? = null
+    private var activity: Activity? = null
+
     // Methods
     private val REQUEST_PERMISSIONS_METHOD = "requestPermissions"
     private val HAS_PERMISSIONS_METHOD = "hasPermissions"
@@ -60,28 +73,36 @@ class DeviceCalendarPlugin() : MethodCallHandler {
     private val LOCAL_ACCOUNT_NAME_ARGUMENT = "localAccountName"
     private val EVENT_AVAILABILITY_ARGUMENT = "availability"
 
-
-    private lateinit var _registrar: Registrar
     private lateinit var _calendarDelegate: CalendarDelegate
 
-    private constructor(registrar: Registrar, calendarDelegate: CalendarDelegate) : this() {
-        _registrar = registrar
-        _calendarDelegate = calendarDelegate
+    override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
+        context = flutterPluginBinding.applicationContext
+        channel = MethodChannel(flutterPluginBinding.binaryMessenger, CHANNEL_NAME)
+        channel.setMethodCallHandler(this)
     }
 
-    companion object {
-        @JvmStatic
-        fun registerWith(registrar: Registrar) {
-            val context: Context = registrar.context()
+    override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
+        channel.setMethodCallHandler(null)
+    }
 
-            val calendarDelegate = CalendarDelegate(registrar, context)
-            val instance = DeviceCalendarPlugin(registrar, calendarDelegate)
+    override fun onAttachedToActivity(binding: ActivityPluginBinding) {
+        activity = binding.activity
+        _calendarDelegate = CalendarDelegate(binding, context!!)
+        binding.addRequestPermissionsResultListener(_calendarDelegate)
+    }
 
-            val calendarsChannel = MethodChannel(registrar.messenger(), CHANNEL_NAME)
-            calendarsChannel.setMethodCallHandler(instance)
+    override fun onDetachedFromActivityForConfigChanges() {
+        activity = null
+    }
 
-            registrar.addRequestPermissionsResultListener(calendarDelegate)
-        }
+    override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
+        activity = binding.activity
+        _calendarDelegate = CalendarDelegate(binding, context!!)
+        binding.addRequestPermissionsResultListener(_calendarDelegate)
+    }
+
+    override fun onDetachedFromActivity() {
+        activity = null
     }
 
     override fun onMethodCall(call: MethodCall, result: Result) {