[flutter_plugin_android_lifecycle] add no-op v2 plugin (flutter#2977)

* Implement FlutterPlugin interface on the no-op plugin

Author: ened

packages/flutter_plugin_android_lifecycle/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 1.0.9
+
+* Let the no-op plugin implement the `FlutterPlugin` interface.
+
 ## 1.0.8
 
 * Post-v2 Android embedding cleanup.

packages/flutter_plugin_android_lifecycle/android/src/main/java/io/flutter/plugins/flutter_plugin_android_lifecycle/FlutterAndroidLifecyclePlugin.java

@@ -4,6 +4,8 @@
 //
 package io.flutter.plugins.flutter_plugin_android_lifecycle;
 
+import androidx.annotation.NonNull;
+import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.plugin.common.PluginRegistry.Registrar;
 
 /**
@@ -12,8 +14,18 @@
  *
  * <p><strong>DO NOT USE THIS CLASS.</strong>
  */
-public class FlutterAndroidLifecyclePlugin {
+public class FlutterAndroidLifecyclePlugin implements FlutterPlugin {
   public static void registerWith(Registrar registrar) {
     // no-op
   }
+
+  @Override
+  public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
+    // no-op
+  }
+
+  @Override
+  public void onDetachedFromEngine(@NonNull FlutterPluginBinding binding) {
+    // no-op
+  }
 }

packages/flutter_plugin_android_lifecycle/pubspec.yaml

@@ -1,6 +1,6 @@
 name: flutter_plugin_android_lifecycle
 description: Flutter plugin for accessing an Android Lifecycle within other plugins.
-version: 1.0.8
+version: 1.0.9
 homepage: https://github.com/flutter/plugins/tree/master/packages/flutter_plugin_android_lifecycle
 
 environment: