要区分检测到的平面，可以使用ARCore的Plane API提供的功能。以下是一个示例代码，演示了如何使用ARCore检测平面并区分它们：

import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

import com.google.ar.core.ArCoreApk;
import com.google.ar.core.Config;
import com.google.ar.core.Frame;
import com.google.ar.core.Plane;
import com.google.ar.core.Session;
import com.google.ar.core.TrackingState;
import com.google.ar.sceneform.ArSceneView;
import com.google.ar.sceneform.FrameTime;

import java.util.List;

public class MainActivity extends AppCompatActivity {
    private static final String TAG = MainActivity.class.getSimpleName();

    private ArSceneView arSceneView;
    private Session session;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (!checkIsSupportedDeviceOrFinish(this)) {
            return;
        }

        setContentView(R.layout.activity_main);

        arSceneView = findViewById(R.id.ar_scene_view);

        // 创建AR会话
        session = new Session(this);
        Config config = new Config(session);
        config.setUpdateMode(Config.UpdateMode.LATEST_CAMERA_IMAGE);
        session.configure(config);

        // 设置AR会话到AR场景视图中
        arSceneView.setupSession(session);

        // 监听AR场景视图的更新
        arSceneView.getScene().addOnUpdateListener(this::onUpdate);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // 检查ARCore是否已安装或需要更新
        if (session != null) {
            switch (ArCoreApk.getInstance().requestInstall(this, !installRequested)) {
                case INSTALL_REQUESTED:
                    installRequested = true;
                    return;
                case INSTALLED:
                    break;
            }

            try {
                // 启动AR会话
                session.resume();
                arSceneView.resume();
            } catch (Exception e) {
                Log.e(TAG, "Could not resume AR session", e);
            }
        }
    }

    @Override
    protected void onPause() {
        super.onPause();

        if (session != null) {
            // 暂停AR会话
            arSceneView.pause();
            session.pause();
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();

        if (session != null) {
            // 关闭AR会话
            session.close();
            session = null;
        }
    }

    private boolean installRequested;

    private static boolean checkIsSupportedDeviceOrFinish(final Activity activity) {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            Toast.makeText(activity, "ARCore requires Android N or later", Toast.LENGTH_LONG).show();
            activity.finish();
            return false;
        }
        String openGlVersionString = ((ActivityManager) activity.getSystemService(Context.ACTIVITY_SERVICE))
                .getDeviceConfigurationInfo()
                .getGlEsVersion();
        if (Double.parseDouble(openGlVersionString) < 3.0) {
            Toast.makeText(activity, "ARCore requires OpenGL ES 3.0 or later", Toast.LENGTH_LONG).show();
            activity.finish();
            return false;
        }
        return true;
    }

    private void onUpdate(FrameTime frameTime) {
        Frame frame = arSceneView.getArFrame();

        if (frame == null) {
            return;
        }

        // 获取检测到的平面列表
        List planes = session.getAllTrackables(Plane.class);

        for (Plane plane : planes) {
            if (plane.getTrackingState() == TrackingState.TRACKING) {
                // 区分不同类型的平面
                if (plane.getType() == Plane.Type.HORIZONTAL_UPWARD_FACING) {
                    // 处理检测到的水平平面
                    Log.d(TAG, "检测到一个水平平面");
                } else if (plane.getType() == Plane.Type.VERTICAL) {
                    // 处理检测到的垂直平面
                    Log.d(TAG, "检测到一个垂直平面");
                }
            }
        }
    }
}

上述示例代码中，我们创建了一个AR会话，并将其与AR场景视图（ArSceneView）关联。然后，在每次AR场景视图更新时，我们使用getAllTrackables(Plane.class)方法获取检测到的平面列表。通过遍历平面列表，可以