安卓代碼實作直播禮物數量放大動畫特效功能

直播禮物數量放大動畫特效功能如下示範：

代碼實作内容如下：

/***
     * 初始化界面布局
     */
private void init() {
        setOrientation(VERTICAL);
        setVisibility(INVISIBLE);
LayoutParams lp = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        setLayoutParams(lp);
        View convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_gift_message,null,false);
        avatar = (ImageView) convertView.findViewById(R.id.avatar);
        giftIv = (ImageView) convertView.findViewById(R.id.gift_type);
        name = (TextView) convertView.findViewById(R.id.name);
        giftName = (TextView) convertView.findViewById(R.id.gift_name);
        giftNumTv = (TextView) convertView.findViewById(R.id.gift_num);
        addView(convertView);
    }           

/***
     * 設定對應的動畫重新整理
     * @param gift
     */
    public void setGift(Gift gift) {
        this.gift = gift;
        refreshView();
    }           

/**
     * 設定禮物數量放大和複原的View
     * @param view
     * @param duration
     */
public void scaleView(View view,long duration){
 AnimatorSet animatorSet = new AnimatorSet();//組合動畫
 ObjectAnimator scaleX = ObjectAnimator.ofFloat(view, "scaleX", 2f, 1f);
 ObjectAnimator scaleY = ObjectAnimator.ofFloat(view, "scaleY", 2f, 1f);
        animatorSet.setDuration(duration);
        animatorSet.setInterpolator(new LinearInterpolator());
        animatorSet.play(scaleY).with(scaleX);//兩個動畫同時開始
        animatorSet.start();
        animatorSet.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                super.onAnimationEnd(animation);
                if (onAnimatorListener!=null){
                    onAnimatorListener.onAnimationEnd(gift);
                }
            }

            @Override
            public void onAnimationStart(Animator animation) {
                super.onAnimationStart(animation);
                if (onAnimatorListener!=null){
                    onAnimatorListener.onAnimationStart(animation);
                }
            }
        });
    }           

/**
     * 重新整理view
     */
    public void refreshView(){
        if (gift==null){
            return;
        }
        giftNum = gift.num ;
        if (!TextUtils.isEmpty(gift.img)){
            Glide.with(getContext()).load(gift.img).placeholder(R.drawable.default_head).into(avatar);
        }else {
            avatar.setImageResource(R.drawable.default_head);
        }
        name.setText(gift.name);
        giftName.setText(gift.giftName);
        giftNumTv.setText("x"+gift.num);
        giftIv.setImageResource(gift.giftType);
        scaleView(giftNumTv,200);
    }           

/**
     * 連續點選送禮物的時候數字累加縮放效果
     * @param num
     */
    public void addNum(int num){
        giftNum += num ;
        giftNumTv.setText("x"+giftNum);
        scaleView(giftNumTv,200);
        handler.removeCallbacks(runnable);
        if (!isShow()){
            show();
        }
        handler.postDelayed(runnable, 3000);
    }
    Handler handler=new Handler();
    Runnable runnable=new Runnable() {
        @Override
        public void run() {
            isShow = false ;
            giftNum = 0;
            setVisibility(INVISIBLE);
        }
    };           

Handler handler=new Handler();
    Runnable runnable=new Runnable() {
        @Override
        public void run() {
            isShow = false ;
            giftNum = 0;
            setVisibility(INVISIBLE);
        }
    };

    /**
     * 顯示view，并開啟定時器
     */
    public void show(){
        isShow = true ;
        setVisibility(VISIBLE);
        handler.postDelayed(runnable, 3000);
    }