如何使用动画使图像滚动像老虎机？

Question

我有静态ImageView，当我点击一个按钮时，它的内容会随机变化。 如何使图像滚动像这样：

public void changeImage() {
    int pickedNumber = FunctionUtils.randomInRange(arrImgList.size());

    Bitmap bmImg = BitmapFactory.decodeFile(arrImgList.get(pickedNumber));
    img.setImageBitmap(bmImg);

    new Handler().postDelayed(new Runnable() {

        @Override
        public void run() {
            if (count < 30) {
                changeImage();
                count++;
            }
        }
    }, 50);
}

我想在更改图片时添加效果：

    Bitmap bmImg = BitmapFactory.decodeFile(arrImgList.get(pickedNumber));
    img.setImageBitmap(bmImg);

Answer 1

我使用Android Wheel： https://code.google.com/p/android-wheel/ 我的适配器：

private class SlotMachineAdapter extends AbstractWheelAdapter {
    // Layout inflater
    private Context context;

    /**
     * Constructor
     */
    public SlotMachineAdapter(Context context) {
        this.context = context;
    }

    @Override
    public int getItemsCount() {
        return arrImgList.size();
    }

    // Layout params for image view
    final ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

    @Override
    public View getItem(int index, View cachedView, ViewGroup parent) {
        ImageView img;

        if (cachedView != null) {
            img = (ImageView) cachedView;
        } else {
            img = new ImageView(context);
        }

        img.setLayoutParams(params);

        Bitmap bitmap = BitmapFactory.decodeFile(arrImgList.get(index));
        Bitmap scaled = Bitmap.createScaledBitmap(bitmap, widthWheel, heightWheel, true);
        bitmap.recycle();

        img.setImageBitmap(scaled);

        return img;
    }
}