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小編給大家分享一下Android如何實現多維商品屬性SKU選擇，相信大部分人都還不怎么了解，因此分享這篇文章給大家參考一下，希望大家閱讀完這篇文章后大有收獲，下面讓我們一起去了解一下吧！
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) {
});
}
}
}
}
}
}以上是“Android如何實現多維商品屬性SKU選擇”這篇文章的所有內容，感謝各位的閱讀！相信大家都有了一定的了解，希望分享的內容對大家有所幫助，如果還想學習更多知識，歡迎關注億速云行業資訊頻道！
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