使用ARCore 1.13或更高版本，可以使用GeoApiManager类中的静态方法getInverseProjectionMatrix()来获取相机的投影矩阵，然后使用该矩阵将三维点转换为屏幕坐标。然后，可以使用反向的屏幕坐标来查询附近的建筑物，从而确定相机指向的建筑物。

以下是一个示例代码，根据相机指向的建筑物，当用户打开相机时，在屏幕上显示该建筑物的名称。

private Frame frame;
private Session session;
private List planes;

private ArrayList buildings = new ArrayList<>();

private TextView buildingTextView;
private boolean isLookingAtBuilding = false;

private final float[] screenPoint = new float[2];

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

    buildingTextView = findViewById(R.id.building_textview);

    session = new Session(this);
    frame = session.update();

    // Initialize buildings list
    buildings.add(new Building("Building A", 34.068921, -118.445181));
    buildings.add(new Building("Building B", 34.069104, -118.444497));

}

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

    // Make sure ARCore is installed and up to date
    ArCoreApk.getInstance().requestInstall(this, true);

    // Start camera
    ArFragment arFragment = (ArFragment) getSupportFragmentManager().findFragmentById(R.id.ar_fragment);
    arFragment.getArSceneView().setupSession(session);
    arFragment.getArSceneView().setLightEstimationEnabled(false);

    arFragment.getArSceneView().getSession().resume();
    arFragment.getArSceneView().getScene().addOnUpdateListener(this);

}

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

@Override
public void onUpdate(FrameTime frameTime) {

    // Get closest plane to camera
    planes = session.getAllTrackables(Plane.class);
    Plane closestPlane = null;
    float closestPlaneDistance = Float.MAX_VALUE;
    for (Plane plane : planes) {
        float cameraDistance = plane.getCenterPose().ty();
        if (cameraDistance < closestPlaneDistance) {
            closestPlane = plane;
            closestPlaneDistance = cameraDistance;
        }
    }

    // Only look for buildings if the user is looking at the closest plane
    if (closestPlane != null