[camera_android_camerax] PROOF OF CONCEPT: Use platform views for camera preview

packages/camera/camera_android_camerax/android/build.gradle

@@ -77,6 +77,7 @@ dependencies {
     implementation("androidx.camera:camera-camera2:${camerax_version}")
     implementation("androidx.camera:camera-lifecycle:${camerax_version}")
     implementation("androidx.camera:camera-video:${camerax_version}")
+    implementation "androidx.camera:camera-view:${camerax_version}"
     implementation("com.google.guava:guava:33.5.0-android")
     testImplementation("junit:junit:4.13.2")
     testImplementation("org.mockito:mockito-core:5.21.0")

packages/camera/camera_android_camerax/android/src/main/java/io/flutter/plugins/camerax/CameraAndroidCameraxPlugin.java

@@ -10,6 +10,7 @@
 import io.flutter.embedding.engine.plugins.FlutterPlugin;
 import io.flutter.embedding.engine.plugins.activity.ActivityAware;
 import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import androidx.camera.view.PreviewView;
 
 /** Platform implementation of the camera_plugin implemented with the CameraX library. */
 public final class CameraAndroidCameraxPlugin implements FlutterPlugin, ActivityAware {
@@ -31,6 +32,7 @@ public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
         new ProxyApiRegistrar(
             binding.getBinaryMessenger(),
             binding.getApplicationContext(),
+            binding.getPlatformViewRegistry(),
             binding.getTextureRegistry());
     proxyApiRegistrar.setUp();
   }

packages/camera/camera_android_camerax/android/src/main/java/io/flutter/plugins/camerax/CameraPreviewFactory.java

@@ -0,0 +1,32 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.camerax;
+
+import android.content.Context;
+import androidx.annotation.Nullable;
+import androidx.annotation.NonNull;
+import io.flutter.plugin.common.StandardMessageCodec;
+import io.flutter.plugin.platform.PlatformView;
+import io.flutter.plugin.platform.PlatformViewFactory;
+import java.util.Map;
+import androidx.camera.view.PreviewView;
+
+class CameraPreviewFactory extends PlatformViewFactory {
+    PreviewView previewView;
+
+    CameraPreviewFactory(PreviewView previewView) {
+        super(StandardMessageCodec.INSTANCE);
+        this.previewView = previewView;
+    }
+
+    @NonNull
+    @Override
+    @SuppressWarnings("unchecked")
+    public PlatformView create(@NonNull Context context, int viewId, @Nullable Object args) {
+        // return previewView;
+        final Map<String, Object> creationParams = (Map<String, Object>) args;
+        return new CameraPreviewView(context, viewId, creationParams, previewView);
+    }
+}

packages/camera/camera_android_camerax/android/src/main/java/io/flutter/plugins/camerax/CameraPreviewView.java

@@ -0,0 +1,33 @@
+// Copyright 2013 The Flutter Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package io.flutter.plugins.camerax;
+
+import android.content.Context;
+import android.graphics.Color;
+import android.view.View;
+import android.widget.TextView;
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import io.flutter.plugin.platform.PlatformView;
+import java.util.Map;
+
+import androidx.camera.view.PreviewView;
+
+class CameraPreviewView implements PlatformView {
+   @NonNull private final PreviewView previewView;
+
+    CameraPreviewView(@NonNull Context context, int id, @Nullable Map<String, Object> creationParams, PreviewView previewView) {
+        this.previewView = previewView;
+    }
+
+    @NonNull
+    @Override
+    public View getView() {
+        return previewView;
+    }
+
+    @Override
+    public void dispose() {}
+}