Migrate Android views e2e to the new embedding (#61205)

dev/integration_tests/android_views/android/app/src/main/AndroidManifest.xml

@@ -25,5 +25,10 @@ found in the LICENSE file. -->
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
+    <!-- Don't delete the meta-data below.
+         This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
     </application>
 </manifest>

dev/integration_tests/android_views/android/app/src/main/java/io/flutter/integration/androidviews/MainActivity.java

@@ -9,10 +9,14 @@ import android.content.pm.PackageManager;
 import android.os.Build;
 import android.os.Bundle;
 import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
 
 import java.util.HashMap;
 
-import io.flutter.app.FlutterActivity;
+import io.flutter.embedding.android.FlutterActivity;
+import io.flutter.embedding.engine.dart.DartExecutor;
+import io.flutter.embedding.engine.FlutterEngine;
 import io.flutter.plugin.common.MethodCall;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugins.GeneratedPluginRegistrant;
@@ -27,18 +31,29 @@ public class MainActivity extends FlutterActivity implements MethodChannel.Metho
     // This is null when not waiting for the Android permission request;
     private MethodChannel.Result permissionResult;
 
+    private View getFlutterView() {
+        // TODO(egarciad): Set an unique ID in FlutterView, so it's easier to look it up.
+        ViewGroup root = (ViewGroup)findViewById(android.R.id.content);
+        return ((ViewGroup)root.getChildAt(0)).getChildAt(0);
+    }
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        GeneratedPluginRegistrant.registerWith(this);
-        getFlutterView().getPluginRegistry()
-                .registrarFor("io.flutter.integration.platform_views").platformViewRegistry()
-                .registerViewFactory("simple_view", new SimpleViewFactory(getFlutterView()));
-        mMethodChannel = new MethodChannel(this.getFlutterView(), "android_views_integration");
-        mMethodChannel.setMethodCallHandler(this);
         mFlutterViewTouchPipe = new TouchPipe(mMethodChannel, getFlutterView());
     }
 
+    @Override
+    public void configureFlutterEngine(FlutterEngine flutterEngine) {
+        DartExecutor executor = flutterEngine.getDartExecutor();
+        flutterEngine
+            .getPlatformViewsController()
+            .getRegistry()
+            .registerViewFactory("simple_view", new SimpleViewFactory(executor));
+        mMethodChannel = new MethodChannel(executor, "android_views_integration");
+        mMethodChannel.setMethodCallHandler(this);
+    }
+
     @Override
     public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) {
         switch(methodCall.method) {

dev/integration_tests/android_views/android/app/src/main/java/io/flutter/integration/androidviews/SimplePlatformView.java

@@ -20,19 +20,21 @@ import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.platform.PlatformView;
 
 public class SimplePlatformView implements PlatformView, MethodChannel.MethodCallHandler {
-    private final View view;
+    private final TextView view;
     private final MethodChannel methodChannel;
     private final io.flutter.integration.platformviews.TouchPipe touchPipe;
 
     SimplePlatformView(Context context, MethodChannel methodChannel) {
         this.methodChannel = methodChannel;
-        view = new View(context) {
+        view = new TextView(context) {
             @Override
             public boolean onTouchEvent(MotionEvent event) {
                 return true;
             }
         };
+        view.setTextSize(72);
         view.setBackgroundColor(0xff0000ff);
+        view.setText("Hello from Android view");
         this.methodChannel.setMethodCallHandler(this);
         touchPipe = new io.flutter.integration.platformviews.TouchPipe(this.methodChannel, view);
     }

dev/integration_tests/android_views/android/app/src/main/java/io/flutter/integration/androidviews/SimpleViewFactory.java

@@ -6,22 +6,22 @@ package io.flutter.integration.platformviews;
 
 import android.content.Context;
 
-import io.flutter.plugin.common.BinaryMessenger;
+import io.flutter.embedding.engine.dart.DartExecutor;
 import io.flutter.plugin.common.MethodChannel;
 import io.flutter.plugin.platform.PlatformView;
 import io.flutter.plugin.platform.PlatformViewFactory;
 
 public class SimpleViewFactory extends PlatformViewFactory {
-    final BinaryMessenger messenger;
+    final DartExecutor executor;
 
-    public SimpleViewFactory(BinaryMessenger messenger) {
+    public SimpleViewFactory(DartExecutor executor) {
         super(null);
-        this.messenger = messenger;
+        this.executor = executor;
     }
 
     @Override
     public PlatformView create(Context context, int id, Object params) {
-        MethodChannel methodChannel = new MethodChannel(messenger, "simple_view/" + id);
+        MethodChannel methodChannel = new MethodChannel(executor, "simple_view/" + id);
         return new SimplePlatformView(context, methodChannel);
     }
 }

dev/integration_tests/android_views/lib/motion_event_diff.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:collection/collection.dart';
-import 'package:flutter/foundation.dart';
 
 // Android MotionEvent actions for which a pointer index is encoded in the
 // unmasked action code.
@@ -14,7 +13,7 @@ const List<int> kPointerActions = <int>[
   6, // POINTER_UP
 ];
 
-const double kDoubleErrorMargin = precisionErrorTolerance;
+const double kDoubleErrorMargin = 1e-4;
 
 String diffMotionEvents(
   Map<String, dynamic> originalEvent,