add android integration & make iOS API consistent

add pubspec android plugin

update android CMakeLists

add filament android libs for linking

android/src/main/kotlin/app/polyvox/filament/PolyvoxFilamentPlugin.kt

@@ -2,26 +2,53 @@ package app.polyvox.filament
 
 import androidx.annotation.NonNull
 
+import androidx.lifecycle.Lifecycle
+
+import io.flutter.embedding.engine.plugins.activity.ActivityAware
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
 import io.flutter.embedding.engine.plugins.FlutterPlugin
 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.embedding.engine.plugins.lifecycle.HiddenLifecycleReference
+
+
 /** PolyvoxFilamentPlugin */
-class PolyvoxFilamentPlugin: FlutterPlugin, MethodCallHandler {
+class PolyvoxFilamentPlugin: FlutterPlugin, MethodCallHandler, ActivityAware {
+
+  companion object {
+      const val VIEW_TYPE = "app.polyvox.filament/filament_view"
+  }
+
   /// 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
 
+  /// Keep a referene to the plugin binding so we can defer construction of a FilamentViewFactory
+  /// until Activity is attached.
+  private lateinit var flutterPluginBinding : FlutterPlugin.FlutterPluginBinding
+
+  private var lifecycle: Lifecycle? = null
+
   override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
-    channel = MethodChannel(flutterPluginBinding.binaryMessenger, "polyvox_filament")
+    this.flutterPluginBinding = flutterPluginBinding
+    channel = MethodChannel(flutterPluginBinding.binaryMessenger, "app.polyvox.filament")
     channel.setMethodCallHandler(this)
   }
 
+  override fun onAttachedToActivity(binding: ActivityPluginBinding) {
+    lifecycle = (binding.lifecycle as? HiddenLifecycleReference)?.lifecycle
+    flutterPluginBinding
+                .platformViewRegistry
+                .registerViewFactory(VIEW_TYPE, FilamentViewFactory(binding.activity, flutterPluginBinding.binaryMessenger))
+  }
+
   override fun onMethodCall(@NonNull call: MethodCall, @NonNull result: Result) {
+
     if (call.method == "getPlatformVersion") {
       result.success("Android ${android.os.Build.VERSION.RELEASE}")
     } else {
@@ -32,4 +59,17 @@ class PolyvoxFilamentPlugin: FlutterPlugin, MethodCallHandler {
   override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
     channel.setMethodCallHandler(null)
   }
+
+  
+  override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
+    onAttachedToActivity(binding)
+  }
+
+  override fun onDetachedFromActivityForConfigChanges() {
+    onDetachedFromActivity()
+  }
+
+  override fun onDetachedFromActivity() {
+  lifecycle = null
+  }
 }