Android 卡片堆叠钱包管理效果
Sand 人气:0先上效果图
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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