如何在AndEngine中显示位图精灵？

我是AndEngine游戏开发的新手。我正在尝试加载并显示单个精灵，但是屏幕上出现了没有精灵的空白blcak屏幕。这是代码：

public class MainActivity extends SimpleBaseGameActivity {

static final int CAMERA_WIDTH = 800; 
static final int CAMERA_HEIGHT = 480;

private static final String TAG = "AndEngineTest";
private BitmapTextureAtlas mBitmapTextureAtlas;
private TextureRegion mPlayerTextureRegion;

@Override
public EngineOptions onCreateEngineOptions() {

    Camera mCamera = new Camera(0, 0, CAMERA_WIDTH , CAMERA_HEIGHT);
    return new EngineOptions(true,ScreenOrientation.LANDSCAPE_SENSOR, 
            new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), mCamera);

}

@Override
protected void onCreateResources() {
    mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 32, 32,
            TextureOptions.BILINEAR_PREMULTIPLYALPHA);
    mPlayerTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "gfx/face_box.png", 0, 0);
    mBitmapTextureAtlas.load();
}

@Override
protected Scene onCreateScene() {

    this.mEngine.unregisterUpdateHandler(new FPSLogger());

    Scene scene = new Scene();
    scene.setBackground(new Background(3f, 6f, 2f));
    Sprite Player = new Sprite(32, 32, mPlayerTextureRegion, getVertexBufferObjectManager());
    Camera mCamera = new Camera(0, 0, CAMERA_WIDTH , CAMERA_HEIGHT);
    Player.setPosition(mCamera.getWidth()/2 - Player.getWidth()/2,
            mCamera.getHeight() - Player.getHeight() - 10);
    scene.attachChild(Player);



    return scene;
}

谁能告诉我这里是什么错误？？？任何有用的帮助将不胜感激。