要使用ARCore增强图像数据库来添加多个图像，您可以使用以下代码示例：

import android.net.Uri;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.google.ar.core.Anchor;
import com.google.ar.core.AugmentedImage;
import com.google.ar.core.AugmentedImageDatabase;
import com.google.ar.core.Config;
import com.google.ar.core.Session;
import com.google.ar.sceneform.AnchorNode;
import com.google.ar.sceneform.FrameTime;
import com.google.ar.sceneform.ux.ArFragment;
import com.google.ar.sceneform.ux.TransformableNode;

import java.io.IOException;
import java.util.Collection;

public class MainActivity extends AppCompatActivity {
    private ArFragment arFragment;

    private boolean shouldAddModel = true;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        arFragment = (ArFragment) getSupportFragmentManager().findFragmentById(R.id.arFragment);
        arFragment.getArSceneView().getScene().addOnUpdateListener(this::onUpdateFrame);
    }

    private void onUpdateFrame(FrameTime frameTime) {
        Session session = arFragment.getArSceneView().getSession();
        Config config = session.getConfig();

        if (session == null || config == null) {
            return;
        }

        Collection updatedAugmentedImages = session.getAllTrackables(AugmentedImage.class);
        for (AugmentedImage augmentedImage : updatedAugmentedImages) {
            if (augmentedImage.getTrackingState() == TrackingState.TRACKING) {
                if (shouldAddModel) {
                    if (augmentedImage.getName().equals("image_name_1")) {
                        placeObject(arFragment, augmentedImage.createAnchor(augmentedImage.getCenterPose()), Uri.parse("model_1.sfb"));
                        shouldAddModel = false;
                    } else if (augmentedImage.getName().equals("image_name_2")) {
                        placeObject(arFragment, augmentedImage.createAnchor(augmentedImage.getCenterPose()), Uri.parse("model_2.sfb"));
                        shouldAddModel = false;
                    }
                    // Add more conditions for other images
                }
            }
        }
    }

    private void placeObject(ArFragment arFragment, Anchor anchor, Uri modelUri) {
        ModelRenderable.builder()
                .setSource(arFragment.getContext(), modelUri)
                .build()
                .thenAccept(modelRenderable -> addNodeToScene(arFragment, anchor, modelRenderable))
                .exceptionally(throwable -> {
                    Toast.makeText(arFragment.getContext(), "Error loading model", Toast.LENGTH_SHORT).show();
                    return null;
                });
    }

    private void addNodeToScene(ArFragment arFragment, Anchor anchor, ModelRenderable modelRenderable) {
        AnchorNode anchorNode = new AnchorNode(anchor);
        TransformableNode transformableNode = new TransformableNode(arFragment.getTransformationSystem());
        transformableNode.setParent(anchorNode);
        transformableNode.setRenderable(modelRenderable);
        arFragment.getArSceneView().getScene().addChild(anchorNode);
        transformableNode.select();
    }

    private void loadAugmentedImageDatabase(Session session) {
        AugmentedImageDatabase augmentedImageDatabase = new AugmentedImageDatabase(session);
        try {
            Bitmap augmentedImageBitmap1 = BitmapFactory.decodeStream(getAssets().open("image_name_1.png"));
            augmentedImageDatabase.addImage("image_name_1", augmentedImageBitmap1);

            Bitmap augmentedImageBitmap2 = BitmapFactory.decodeStream(getAssets().open("image_name_2.png"));
            augmentedImageDatabase.addImage("image_name_2", augmentedImageBitmap2);

            // Add more images to the database

            Config config = session.getConfig();
            config.setAugmentedImageDatabase(augmentedImageDatabase);
            session.configure(config);
        } catch (IOException e) {
            Log.e("MainActivity", "Exception loading augmented image database", e);
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (arFragment != null) {
            Session session = arFragment.getArSceneView().getSession();
            if (session == null) {
                session = new Session(this);
                arFragment.getArSceneView().setupSession(session);
            }
            loadAugmentedImageDatabase(session);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (arFragment != null) {
            Session session = arFragment.getArSceneView().getSession();
            if (session != null) {
                arFragment.getArSceneView().pause();
            }
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (arFragment != null) {
            Session session = arFragment.getArSceneView().getSession();
            if (