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Android 卡片堆叠钱包管理效果

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先上效果图

源码 github.com/woshiwzy/Ca…

实现原理:

1.继承LinearLayout
2.重写onLayout,onMeasure 方法
3.利用ValueAnimator 实施动画
4.在动画回调中requestLayout 实现动画效果

思路:

1.用Bounds 对象记录每一个CardView 对象的初始位置,当前位置,运动目标位置

2.点击时计算出对应的view以及可能会产生关联运动的View的运动的目标位置,从当前位置运动到目标位置,然后以这2个位置作为动画参数实施ValueAnimator动画,在动画回调中触发onLayout,达到动画的效果。

重写adView 方法

确保新添加的在这里确保所有的子view 都有一个初始化的bounds位置

   @Override
    public void addView(View child, ViewGroup.LayoutParams params) {
        super.addView(child, params);
        Bounds bounds = getBunds(getChildCount());
    }

确保每个子View的测量属性宽度填满父组件

    boolean mesured = false;
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        if (mesured == true) {//只需要测量一次
            return;
        }
        mesured = true;
        int childCount = getChildCount();
        int rootWidth = getWidth();
        int rootHeight = getHeight();
        if (childCount > 0) {
            View child0 = getChildAt(0);
            int modeWidth = MeasureSpec.getMode(child0.getMeasuredWidth());
            int sizeWidth = MeasureSpec.getSize(child0.getMeasuredWidth());

            int modeHeight = MeasureSpec.getMode(child0.getMeasuredHeight());
            int sizeHeight = MeasureSpec.getSize(child0.getMeasuredHeight());

            if (childCount > 0) {
                for (int i = 0; i < childCount; i++) {
                    View childView = getChildAt(i);
                    childView.measure(MeasureSpec.makeMeasureSpec(sizeWidth, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(sizeHeight, MeasureSpec.EXACTLY));
                    int top = (int) (i * (sizeHeight * carEvPercnet));
                    getBunds(i).setTop(top);
                    getBunds(i).setCurrentTop(top);
                    getBunds(i).setLastCurrentTop(top);
                    getBunds(i).setHeight(sizeHeight);
                }

            }

        }
    }

重写onLayout 方法是关键

是动画触发的主要目的,这里layout参数并不是写死的,而是计算出来的(通过ValueAnimator 计算出来的)

@Override
    protected void onLayout(boolean changed, int sl, int st, int sr, int sb) {
        int childCount = getChildCount();
        if (childCount > 0) {
            for (int i = 0; i < childCount; i++) {
                View view = getChildAt(i);
                int mWidth = view.getMeasuredWidth();
                int mw = MeasureSpec.getSize(mWidth);
                int l = 0, r = l + mw;
                view.layout(l, getBunds(i).getCurrentTop(), r, getBunds(i).getCurrentTop() + getBunds(i).getHeight());
            }
        }
    }

源码

github: github.com/woshiwzy/Ca…

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