如何利用手机的摄像头、指南针和定位功能实现移动现实（MobileReality）？

1. 首先需要在 AndroidManifest.xml 文件中添加必要的权限：

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

2. 在布局文件中添加一个相机视图和指南针视图，以及一个显示当前经纬度和方向的文本视图：

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <ImageView
        android:id="@+id/compassView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/compass" />

    <TextView
        android:id="@+id/locationTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"
        android:textColor="#FFFFFF"
        android:background="#80000000"
        android:padding="10dp"
        android:layout_margin="10dp"
        android:layout_gravity="bottom|left" />

</FrameLayout>

3. 在代码中初始化相机和指南针：

private Camera camera;
private SurfaceView surfaceView;
private ImageView compassView;

...

private void initCamera() {
    surfaceView = findViewById(R.id.surfaceView);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    surfaceHolder.addCallback(new SurfaceHolder.Callback() {
        @Override
        public void surfaceCreated(SurfaceHolder holder) {
            camera = Camera.open();
            try {
                camera.setPreviewDisplay(holder);
                camera.startPreview();
            } catch (IOException e) {
                Log.e(TAG, "Error setting camera preview: " + e.getMessage());
            }
        }

        @Override
        public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            // no-op
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            camera.stopPreview();
            camera.release();
            camera = null;
        }
    });
}

private void initCompass() {
    compassView = findViewById(R.id.compassView);
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
            SensorManager.SENSOR_DELAY_GAME);
}

@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // no-op
}

@Override
public void