Android实现多维商品属性SKU选择

前言：

最近又做到这一块的需求，以前也做过类似仿淘宝的属性选择，当时在网上下载的demo参考，最多也支持两组商品属性，用的两个gridview结合，扩展性很差，这次不打算用之前的代码，所以重新自己写了一个demo**（文末附上项目地址）**

如图所示，界面UI这一块肯定不用gridview，那样太过繁琐，所以采用recyclerview，item里面渲染ViewGroup，根据数据源的数量，往ViewGroup里面添加Textview。这样就可以解决它的每个属性按钮宽高自适应。
这里重点是重写ViewGroup里面的onMeasure和onLayout方法：

/**
   * 测量子view大小 根据子控件设置宽和高
   */
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
  {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    // 获得它的父容器为它设置的测量模式和大小
    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情况下，记录宽和高
    int width = 0;
    int height = 0;
    /**
     * 记录每一行的宽度，width不断取最大宽度
     */
    int lineWidth = 0;
    /**
     * 每一行的高度，累加至height
     */
    int lineHeight = 0;

    int cCount = getChildCount();

    // 遍历每个子元素
    for (int i = 0; i < cCount; i++)
    {
      View child = getChildAt(i);
      // 测量每一个child的宽和高
      measureChild(child, widthMeasureSpec, heightMeasureSpec);
      // 得到child的布局管理器
      MarginLayoutParams lp = (MarginLayoutParams) child
          .getLayoutParams();
      // 当前子空间实际占据的宽度
      int childWidth = child.getMeasuredWidth() + lp.leftMargin
          + lp.rightMargin;
      // 当前子空间实际占据的高度
      int childHeight = child.getMeasuredHeight() + lp.topMargin
          + lp.bottomMargin;
      /**
       * 如果加入当前child，则超出最大宽度，则的到目前最大宽度给width，类加height 然后开启新行
       */
      if (lineWidth + childWidth > sizeWidth)
      {
        width = Math.max(lineWidth, childWidth);// 取最大的
        lineWidth = childWidth; // 重新开启新行，开始记录
        // 叠加当前高度，
        height += lineHeight;
        // 开启记录下一行的高度
        lineHeight = childHeight;
      } else
      // 否则累加值lineWidth,lineHeight取最大高度
      {
        lineWidth += childWidth;
        lineHeight = Math.max(lineHeight, childHeight);
      }
      // 如果是最后一个，则将当前记录的最大宽度和当前lineWidth做比较
      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;
    // 存储每一行所有的childView
    List<View> lineViews = new ArrayList<>();
    int cCount = getChildCount();
    // 遍历所有的孩子
    for (int i = 0; i < cCount; i++)
    {
      View child = getChildAt(i);
      MarginLayoutParams lp = (MarginLayoutParams) child
          .getLayoutParams();
      int childWidth = child.getMeasuredWidth();
      int childHeight = child.getMeasuredHeight();

      // 如果已经需要换行
      if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width)
      {
        // 记录这一行所有的View以及最大高度
        mLineHeight.add(lineHeight);
        // 将当前行的childView保存，然后开启新的ArrayList保存下一行的childView
        mAllViews.add(lineViews);
        lineWidth = 0;// 重置行宽
        lineViews = new ArrayList<>();
      }
      /**
       * 如果不需要换行，则累加
       */
      lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
      lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
          + lp.bottomMargin);
      lineViews.add(child);
    }
    // 记录最后一行
    mLineHeight.add(lineHeight);
    mAllViews.add(lineViews);

    int left = 0;
    int top = 0;
    // 得到总行数
    int lineNums = mAllViews.size();
    for (int i = 0; i < lineNums; i++)
    {
      // 每一行的所有的views
      lineViews = mAllViews.get(i);
      // 当前行的最大高度
      lineHeight = mLineHeight.get(i);

      // 遍历当前行所有的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();

        //计算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;
    }

  }

接下来是SKU的算法，因为本人的学生时期数学没有好好学习，幂集什么的，都不是很懂。所以在这里用了另外一种方法，把选项状态（三种：不能选择，可以选择，已选中）依次对属性按钮做出修改，这里虽然做了一些不必要的循环判断，但胜在功能的实现，如果大家有更好的想法，望不吝赐教。

贴上adapter代码（重点initOptions、canClickOptions和getSelected三个方法）

/**
 * Created by 胡逸枫 on 2017/1/16.
 */
public class GoodsAttrsAdapter extends BaseRecyclerAdapter<GoodsAttrsBean.AttributesBean> {

  private SKUInterface myInterface;

  private SimpleArrayMap<Integer, String> saveClick;

  private List<GoodsAttrsBean.StockGoodsBean> stockGoodsList;//商品数据集合
  private String[] selectedValue;  //选中的属性
  private TextView[][] childrenViews;  //二维 装所有属性

  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 {
    //点击操作 选中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));
        }
      }
    }

  }

  /**
   * 初始化选项（不可点击，焦点消失）
   */
  private void initOptions() {
    for (int y = 0; y < childrenViews.length; y++) {
      for (int z = 0; z < childrenViews[y].length; z++) {//循环所有属性
        TextView textView = childrenViews[y][z];
        textView.setEnabled(false);
        textView.setFocusable(false);
        textView.setTextColor(ContextCompat.getColor(mContext, R.color.gray));//变灰
      }
    }
  }

  /**
   * 找到符合条件的选项变为可选
   */
  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];//拿到所有属性TextView
            String name = textView.getText().toString();
            //拿到属性名称
            if (goodsInfo.get(i).getTabValue().equals(name)) {
              textView.setEnabled(true);//符合就变成可点击
              textView.setFocusable(true); //设置可以获取焦点
              //不要让焦点乱跑
              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) {
              });
            }
          }
        }
      }
    }
  }

  /**
   * 找到已经选中的选项，让其变红
   */
  private void getSelected() {
    for (int i = 0; i < childrenViews.length; i++) {
      for (int j = 0; j < childrenViews[i].length; j++) {//拿到每行属性Item
        TextView textView = childrenViews[i][j];//拿到所有属性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) {
            });
          }
        }
      }
    }
  }
}

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