前言：
最近又做到這一塊的需求，以前也做過類似仿淘寶的屬性選擇，當時在網上下載的demo參考，最多也支持兩組商品屬性，用的兩個gridview結合，擴展性很差，這次不打算用之前的代碼，所以重新自己寫了一個demo**（文末附上項目地址）**
如圖所示，界面UI這一塊肯定不用gridview，那樣太過繁瑣，所以采用recyclerview，item里面渲染ViewGroup，根據數據源的數量，往ViewGroup里面添加Textview。這樣就可以解決它的每個屬性按鈕寬高自適應。
這里重點是重寫ViewGroup里面的onMeasure和onLayout方法：
/** * 測量子view大小 根據子控件設置寬和高 */ @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); // 獲得它的父容器為它設置的測量模式和大小 int sizeWidth = MeasureSpec.getSize(widthMeasureSpec); int sizeHeight = MeasureSpec.getSize(heightMeasureSpec); int modeWidth = MeasureSpec.getMode(widthMeasureSpec); int modeHeight = MeasureSpec.getMode(heightMeasureSpec); // 如果是warp_content情況下，記錄寬和高 int width = 0; int height = 0; /** * 記錄每一行的寬度，width不斷取最大寬度 */ int lineWidth = 0; /** * 每一行的高度，累加至height */ int lineHeight = 0; int cCount = getChildCount(); // 遍歷每個子元素 for (int i = 0; i < cCount; i++) { View child = getChildAt(i); // 測量每一個child的寬和高 measureChild(child, widthMeasureSpec, heightMeasureSpec); // 得到child的布局管理器 MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); // 當前子空間實際占據的寬度 int childWidth = child.getMeasuredWidth() + lp.leftMargin + lp.rightMargin; // 當前子空間實際占據的高度 int childHeight = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; /** * 如果加入當前child，則超出最大寬度，則的到目前最大寬度給width，類加height 然后開啟新行 */ if (lineWidth + childWidth > sizeWidth) { width = Math.max(lineWidth, childWidth);// 取最大的 lineWidth = childWidth; // 重新開啟新行，開始記錄 // 疊加當前高度， height += lineHeight; // 開啟記錄下一行的高度 lineHeight = childHeight; } else // 否則累加值lineWidth,lineHeight取最大高度 { lineWidth += childWidth; lineHeight = Math.max(lineHeight, childHeight); } // 如果是最后一個，則將當前記錄的最大寬度和當前lineWidth做比較 if (i == cCount - 1) { width = Math.max(width, lineWidth); height += lineHeight; } } setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth : width, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight : height); }@Override protected void onLayout(boolean changed, int l, int t, int r, int b) { mAllViews.clear(); mLineHeight.clear(); int width = getWidth(); int lineWidth = 0; int lineHeight = 0; // 存儲每一行所有的childView List<View> lineViews = new ArrayList<>(); int cCount = getChildCount(); // 遍歷所有的孩子 for (int i = 0; i < cCount; i++) { View child = getChildAt(i); MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); int childWidth = child.getMeasuredWidth(); int childHeight = child.getMeasuredHeight(); // 如果已經需要換行 if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width) { // 記錄這一行所有的View以及最大高度 mLineHeight.add(lineHeight); // 將當前行的childView保存，然后開啟新的ArrayList保存下一行的childView mAllViews.add(lineViews); lineWidth = 0;// 重置行寬 lineViews = new ArrayList<>(); } /** * 如果不需要換行，則累加 */ lineWidth += childWidth + lp.leftMargin + lp.rightMargin; lineHeight = Math.max(lineHeight, childHeight + lp.topMargin + lp.bottomMargin); lineViews.add(child); } // 記錄最后一行 mLineHeight.add(lineHeight); mAllViews.add(lineViews); int left = 0; int top = 0; // 得到總行數 int lineNums = mAllViews.size(); for (int i = 0; i < lineNums; i++) { // 每一行的所有的views lineViews = mAllViews.get(i); // 當前行的最大高度 lineHeight = mLineHeight.get(i); // 遍歷當前行所有的View for (int j = 0; j < lineViews.size(); j++) { View child = lineViews.get(j); if (child.getVisibility() == View.GONE) { continue; } MarginLayoutParams lp = (MarginLayoutParams) child .getLayoutParams(); //計算childView的Marginleft,top,right,bottom int lc = left + lp.leftMargin; int tc = top + lp.topMargin; int rc =lc + child.getMeasuredWidth(); int bc = tc + child.getMeasuredHeight(); child.layout(lc, tc, rc, bc); left += child.getMeasuredWidth() + lp.rightMargin + lp.leftMargin; } left = 0; top += lineHeight; } }接下來是SKU的算法，因為本人的學生時期數學沒有好好學習，冪集什么的，都不是很懂。所以在這里用了另外一種方法，把選項狀態（三種：不能選擇，可以選擇，已選中）依次對屬性按鈕做出修改，這里雖然做了一些不必要的循環判斷，但勝在功能的實現，如果大家有更好的想法，望不吝賜教。
貼上adapter代碼（重點initOptions、canClickOptions和getSelected三個方法）
/** * Created by 胡逸楓 on 2017/1/16. */public class GoodsAttrsAdapter extends BaseRecyclerAdapter<GoodsAttrsBean.AttributesBean> { private SKUInterface myInterface; private SimpleArrayMap<Integer, String> saveClick; private List<GoodsAttrsBean.StockGoodsBean> stockGoodsList;//商品數據集合 private String[] selectedValue; //選中的屬性 private TextView[][] childrenViews; //二維 裝所有屬性 private final int SELECTED = 0x100; private final int CANCEL = 0x101; public GoodsAttrsAdapter(Context ctx, List<GoodsAttrsBean.AttributesBean> list, List<GoodsAttrsBean.StockGoodsBean> stockGoodsList) { super(ctx, list); this.stockGoodsList = stockGoodsList; saveClick = new SimpleArrayMap<>(); childrenViews = new TextView[list.size()][0]; selectedValue = new String[list.size()]; for (int i = 0; i < list.size(); i++) { selectedValue[i] = ""; } } public void setSKUInterface(SKUInterface myInterface) { this.myInterface = myInterface; } @Override public int getItemLayoutId(int viewType) { return R.layout.item_skuattrs; } @Override public void bindData(RecyclerViewHolder holder, int position, GoodsAttrsBean.AttributesBean item) { TextView tv_ItemName = holder.getTextView(R.id.tv_ItemName); SKUViewGroup vg_skuItem = (SKUViewGroup) holder.getView(R.id.vg_skuItem); tv_ItemName.setText(item.getTabName()); List<String> childrens = item.getAttributesItem(); int childrenSize = childrens.size(); TextView[] textViews = new TextView[childrenSize]; for (int i = 0; i < childrenSize; i++) { LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); params.setMargins(5, 5, 5, 0); TextView textView = new TextView(mContext); textView.setGravity(Gravity.CENTER); textView.setPadding(15, 5, 15, 5); textView.setLayoutParams(params); textView.setBackgroundColor(ContextCompat.getColor(mContext, R.color.saddlebrown)); textView.setText(childrens.get(i)); textView.setTextColor(ContextCompat.getColor(mContext, R.color.white)); textViews[i] = textView; vg_skuItem.addView(textViews[i]); } childrenViews[position] = textViews; initOptions(); canClickOptions(); getSelected(); } private int focusPositionG, focusPositionC; private class MyOnClickListener implements View.OnClickListener { //點擊操作 選中SELECTED 取消CANCEL private int operation; private int positionG; private int positionC; public MyOnClickListener(int operation, int positionG, int positionC) { this.operation = operation; this.positionG = positionG; this.positionC = positionC; } @Override public void onClick(View v) { focusPositionG = positionG; focusPositionC = positionC; String value = childrenViews[positionG][positionC].getText().toString(); switch (operation) { case SELECTED: saveClick.put(positionG, positionC + ""); selectedValue[positionG] = value; myInterface.selectedAttribute(selectedValue); break; case CANCEL: saveClick.put(positionG, ""); for (int l = 0; l < selectedValue.length; l++) { if (selectedValue[l].equals(value)) { selectedValue[l] = ""; break; } } myInterface.uncheckAttribute(selectedValue); break; } initOptions(); canClickOptions(); getSelected(); } } class MyOnFocusChangeListener implements View.OnFocusChangeListener { private int positionG; private int positionC; public MyOnFocusChangeListener(int positionG, int positionC) { this.positionG = positionG; this.positionC = positionC; } @Override public void onFocusChange(View v, boolean hasFocus) { String clickpositionC = saveClick.get(positionG); if (hasFocus) { v.setBackgroundColor(ContextCompat.getColor(mContext, R.color.pink)); if (TextUtils.isEmpty(clickpositionC)) { ((TextView) v).setTextColor(ContextCompat.getColor(mContext, R.color.dodgerblue)); } else if (clickpositionC.equals(positionC + "")) { } else { ((TextView) v).setTextColor(ContextCompat.getColor(mContext, R.color.dodgerblue)); } } else { v.setBackgroundColor(ContextCompat.getColor(mContext, R.color.saddlebrown)); if (TextUtils.isEmpty(clickpositionC)) { ((TextView) v).setTextColor(ContextCompat.getColor(mContext, R.color.white)); } else if (clickpositionC.equals(positionC + "")) { } else { ((TextView) v).setTextColor(ContextCompat.getColor(mContext, R.color.white)); } } } } /** * 初始化選項（不可點擊，焦點消失） */ private void initOptions() { for (int y = 0; y < childrenViews.length; y++) { for (int z = 0; z < childrenViews[y].length; z++) {//循環所有屬性 TextView textView = childrenViews[y][z]; textView.setEnabled(false); textView.setFocusable(false); textView.setTextColor(ContextCompat.getColor(mContext, R.color.gray));//變灰 } } } /** * 找到符合條件的選項變為可選 */ private void canClickOptions() { for (int i = 0; i < childrenViews.length; i++) { for (int j = 0; j < stockGoodsList.size(); j++) { boolean filter = false; List<GoodsAttrsBean.StockGoodsBean.GoodsInfoBean> goodsInfo = stockGoodsList.get(j).getGoodsInfo(); for (int k = 0; k < selectedValue.length; k++) { if (i == k || TextUtils.isEmpty(selectedValue[k])) { continue; } if (!selectedValue[k].equals(goodsInfo .get(k).getTabValue())) { filter = true; break; } } if (!filter) { for (int n = 0; n < childrenViews[i].length; n++) { TextView textView = childrenViews[i][n];//拿到所有屬性TextView String name = textView.getText().toString(); //拿到屬性名稱 if (goodsInfo.get(i).getTabValue().equals(name)) { textView.setEnabled(true);//符合就變成可點擊 textView.setFocusable(true); //設置可以獲取焦點 //不要讓焦點亂跑 if (focusPositionG == i && focusPositionC == n) { textView.setTextColor(ContextCompat.getColor(mContext, R.color.dodgerblue)); textView.requestFocus(); } else { textView.setTextColor(ContextCompat.getColor(mContext, R.color.white)); } textView.setOnClickListener(new MyOnClickListener(SELECTED, i, n) { }); textView.setOnFocusChangeListener(new MyOnFocusChangeListener(i, n) { }); } } } } } } /** * 找到已經選中的選項，讓其變紅 */ private void getSelected() { for (int i = 0; i < childrenViews.length; i++) { for (int j = 0; j < childrenViews[i].length; j++) {//拿到每行屬性Item TextView textView = childrenViews[i][j];//拿到所有屬性TextView String value = textView.getText().toString(); for (int m = 0; m < selectedValue.length; m++) { if (selectedValue[m].equals(value)) { textView.setTextColor(ContextCompat.getColor(mContext, R.color.red)); textView.setOnClickListener(new MyOnClickListener(CANCEL, i, j) { }); } } } } }}下載鏈接:
GitHub:地址
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持VEVB武林網。
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