Add goods to shopping cart with animations

gistfile1.txt

public class AddToCartHelper {

    @Inject
    Context mContext;

    /**
    * @param v          移动对象
    * @param fromXDelta 开始位置X轴偏移
    * @param fromYDelta 开始位置Y轴偏移
    * @param fx        开始移动时 v 的x坐标
    * @param fy        开始移动时 v 的y坐标
    * @param tx        移动结束时 v 的x坐标
    * @param ty        移动结束时 v 的y坐标
    */
    public void startAnimation(final View v, int fromXDelta, int fromYDelta, int fx, int fy, int tx, int ty, final AnimationListener listener) {
        AnimationSet set = new AnimationSet(false);
        TranslateAnimation translateAnimation = new TranslateAnimation(fromXDelta, tx - fx, fromYDelta, ty - fy);
        translateAnimation.setInterpolator(new DecelerateInterpolator());
        translateAnimation.setRepeatCount(0);
        translateAnimation.setFillAfter(false);

        ScaleAnimation scaleAnimation = new ScaleAnimation(1.0f, 0.1f, 1.0f, 0.1f, Animation.ABSOLUTE, 0.5f, Animation.ABSOLUTE, 0.5f);
        scaleAnimation.setFillAfter(false);
        scaleAnimation.setInterpolator(new DecelerateInterpolator());
        scaleAnimation.setRepeatCount(0);

        AlphaAnimation alphaAnimation = new AlphaAnimation(1.0f, 0.3f);
        scaleAnimation.setFillAfter(false);
        scaleAnimation.setInterpolator(new DecelerateInterpolator());
        scaleAnimation.setRepeatCount(0);

        set.addAnimation(alphaAnimation);
        set.addAnimation(scaleAnimation);
        set.addAnimation(translateAnimation);

        set.setDuration(1000);
        set.setFillAfter(false);
//        v.setLayerType(View.LAYER_TYPE_HARDWARE, null);

        set.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
                v.setVisibility(View.VISIBLE);
            }

            @Override
            public void onAnimationEnd(Animation animation) {
//                v.setLayerType(View.LAYER_TYPE_NONE, null);
                v.setVisibility(View.GONE);
                if (listener != null) {
                    listener.onAnimationEnd();
                }
            }

            @Override
            public void onAnimationRepeat(Animation animation) {

            }
        });
        v.startAnimation(set);
    }

    /**
    * @param activity
    * @return
    */
    public ViewGroup createAnimLayout(Activity activity) {
        ViewGroup rootView = (ViewGroup) activity.getWindow().getDecorView();
        LinearLayout animLayout = new LinearLayout(activity);
        LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT);
        animLayout.setLayoutParams(lp);
        animLayout.setId(Integer.MAX_VALUE - 1);
        animLayout.setBackgroundResource(android.R.color.transparent);
        rootView.addView(animLayout);
        return animLayout;
    }

    /**
    * @param parent
    * @param view
    * @param location
    * @return
    */
    public View addViewToAnimLayout(final ViewGroup parent, final View view, int[] location, boolean wrap_content) {
        if (view == null) return null;
        int x = location[0];
        int y = location[1];
        LinearLayout.LayoutParams params;
        if (wrap_content) {
            Drawable drawable = ((ImageView) view).getDrawable();
            if (drawable == null) {
                final int wh = mContext.getResources().getDimensionPixelSize(R.dimen.db_goods_wh);
                params = new LinearLayout.LayoutParams(wh, wh);
            } else {
                params = new LinearLayout.LayoutParams(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
            }
        } else {
            final int wh = mContext.getResources().getDimensionPixelSize(R.dimen.db_goods_wh);
            params = new LinearLayout.LayoutParams(wh, wh);
        }
        params.leftMargin = x;
        params.topMargin = y;
        view.setLayoutParams(params);
        return view;
    }

    public interface AnimationListener {
        /**
        * 处理动画结束后的逻辑，不要涉及动画相关的View
        */
        void onAnimationEnd();
    }
}

Usage：

int[] startXY = new int[2];
goodsImageView.getLocationInWindow(startXY);
int fx = startXY[0];
int fy = startXY[1];
final ImageView animImg = new ImageView(this);
animImg.setImageDrawable(goodsImageView.getDrawable());

ViewGroup anim_mask_layout = mAddToCartHelper.createAnimLayout(this);
anim_mask_layout.addView(animImg);
final View v = mAddToCartHelper.addViewToAnimLayout(anim_mask_layout, animImg, startXY, true);
if (v == null) return;

View cartView = findViewById(R.id.lfCart);
int[] endXY = new int[2];
cartView.getLocationInWindow(endXY);
int tx = endXY[0] + cartView.getWidth() / 2;
int ty = endXY[1] + cartView.getHeight() / 2;
mAddToCartHelper.startAnimation(v, 0, -animImg.getHeight() / 2, fx, fy, tx, ty, null);