Refactored so that CameraSystem and AndroidCameraSystem could be redu…

…ced to just a CameraSystem that doesn't know about Android stuff.

packages/camera/android/src/main/java/dev/flutter/plugins/camera/AndroidCameraFactory.java

@@ -0,0 +1,48 @@
+package dev.flutter.plugins.camera;
+
+import android.content.Context;
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraManager;
+
+import androidx.annotation.NonNull;
+
+import io.flutter.embedding.engine.plugins.FlutterPlugin;
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding;
+import io.flutter.view.TextureRegistry;
+
+/* package */ class AndroidCameraFactory implements CameraFactory {
+  @NonNull
+  private final FlutterPlugin.FlutterPluginBinding pluginBinding;
+  @NonNull
+  private final ActivityPluginBinding activityBinding;
+
+  /* package */ AndroidCameraFactory(
+      @NonNull FlutterPlugin.FlutterPluginBinding pluginBinding,
+      @NonNull ActivityPluginBinding activityBinding
+  ) {
+    this.pluginBinding = pluginBinding;
+    this.activityBinding = activityBinding;
+  }
+
+  @NonNull
+  @Override
+  public Camera createCamera(
+      @NonNull String cameraName,
+      @NonNull String resolutionPreset,
+      boolean enableAudio
+  ) throws CameraAccessException {
+    TextureRegistry.SurfaceTextureEntry textureEntry = pluginBinding
+        .getFlutterEngine()
+        .getRenderer()
+        .createSurfaceTexture();
+
+    return new Camera(
+        activityBinding.getActivity(),
+        (CameraManager) activityBinding.getActivity().getSystemService(Context.CAMERA_SERVICE),
+        textureEntry,
+        cameraName,
+        resolutionPreset,
+        enableAudio
+    );
+  }
+}

packages/camera/android/src/main/java/dev/flutter/plugins/camera/AndroidCameraHardware.java

@@ -0,0 +1,34 @@
+package dev.flutter.plugins.camera;
+
+import android.hardware.camera2.CameraAccessException;
+import android.hardware.camera2.CameraManager;
+
+import androidx.annotation.NonNull;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+/* package */ class AndroidCameraHardware implements CameraHardware {
+  @NonNull
+  private final CameraManager cameraManager;
+
+  /* package */ AndroidCameraHardware(@NonNull CameraManager cameraManager) {
+    this.cameraManager = cameraManager;
+  }
+
+  @NonNull
+  @Override
+  public List<CameraDetails> getAvailableCameras() throws CameraAccessException {
+    List<Map<String, Object>> allCameraDetailsSerialized = CameraUtils.getAvailableCameras(cameraManager);
+    List<CameraDetails> allCameraDetails = new ArrayList<>();
+    for (Map<String, Object> serializedDetails : allCameraDetailsSerialized) {
+      allCameraDetails.add(new CameraDetails(
+          (String) serializedDetails.get("name"),
+          (Integer) serializedDetails.get("sensorOrientation"),
+          (String) serializedDetails.get("lensFacing")
+      ));
+    }
+    return allCameraDetails;
+  }
+}

packages/camera/android/src/main/java/dev/flutter/plugins/camera/Camera.java

@@ -126,6 +126,10 @@ public void onOrientationChanged(int orientation) {
     previewSize = computeBestPreviewSize(cameraName, preset);
   }
 
+  public long getTextureId() {
+    return flutterTexture.id();
+  }
+
   public void setCameraEventHandler(@Nullable CameraEventHandler handler) {
     this.cameraEventHandler = handler;
   }

packages/camera/android/src/main/java/dev/flutter/plugins/camera/CameraFactory.java

@@ -0,0 +1,14 @@
+package dev.flutter.plugins.camera;
+
+import android.hardware.camera2.CameraAccessException;
+
+import androidx.annotation.NonNull;
+
+public interface CameraFactory {
+  @NonNull
+  Camera createCamera(
+      @NonNull String cameraName,
+      @NonNull String resolutionPreset,
+      boolean enableAudio
+  ) throws CameraAccessException;
+}

packages/camera/android/src/main/java/dev/flutter/plugins/camera/CameraHardware.java

@@ -0,0 +1,12 @@
+package dev.flutter.plugins.camera;
+
+import android.hardware.camera2.CameraAccessException;
+
+import androidx.annotation.NonNull;
+
+import java.util.List;
+
+public interface CameraHardware {
+  @NonNull
+  List<CameraDetails> getAvailableCameras() throws CameraAccessException;
+}