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嗨，我在这里做一个应用程序，我需要用一些力量像弹跳球一样移动精灵。使用 box2d 如何施加力和速度以及如何像球一样移动精灵，我不知道。请任何人建议我...

        MainActivity.class: 

      public class MainActivity extends SimpleBaseGameActivity{

            private Camera mCamera;

    private BitmapTextureAtlas mBitmapTextureAtlas;
    private ITextureRegion mFaceTextureRegion;

    private BitmapTextureAtlas mOnScreenControlTexture;
    private ITextureRegion mOnScreenControlBaseTextureRegion;
    private ITextureRegion mOnScreenControlKnobTextureRegion;



    @Override
    public EngineOptions onCreateEngineOptions() {
        Toast.makeText(this, "Also try tapping this AnalogOnScreenControl!", Toast.LENGTH_LONG).show();

        this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

        return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), this.mCamera);
    }

    @Override
    public void onCreateResources() {
        BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");

        this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(), 32, 32, TextureOptions.BILINEAR);
        this.mFaceTextureRegion = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas, this, "face_box.png", 0, 0);
        this.mBitmapTextureAtlas.load();


    }

    @Override
    public Scene onCreateScene() {
        this.mEngine.registerUpdateHandler(new FPSLogger());

        final Scene scene = new Scene();
        scene.setBackground(new Background(0.09804f, 0.6274f, 0.8784f));

        final float centerX = (CAMERA_WIDTH - this.mFaceTextureRegion.getWidth()) / 2;
        final float centerY = (CAMERA_HEIGHT - this.mFaceTextureRegion.getHeight()) / 2;
        final Sprite face = new Sprite(centerX, centerY, this.mFaceTextureRegion, this.getVertexBufferObjectManager());
        final PhysicsHandler physicsHandler = new PhysicsHandler(face);
        face.registerUpdateHandler(physicsHandler);

        scene.attachChild(face);



        return scene;
    }


  }
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