Android实现购物车整体页面逻辑详解

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
String url = "http://www.zhaoapi.cn/product/getCarts";
private ExpandableListView el_cart;
private CheckBox cb_cart_all_select;
private TextView tv_cart_total_price;
private Button btn_cart_pay;
MyAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initData() {
HashMap<String, String  map = new HashMap< ();
map.put("uid","71");
OkhtttpUtils.getInstance().doPost(url, map, new OkhtttpUtils.OkCallback() {
@Override
public void onFailure(Exception e) {
}
@Override
public void onResponse(String json) {
CartInfo cartInfo = new Gson().fromJson(json, CartInfo.class);
if ("0".equals(cartInfo.getCode())){
List<CartInfo.DataBean  data = cartInfo.getData();
adapter = new MyAdapter(data);
el_cart.setAdapter(adapter);
//展开二级列表
for(int x=0; x<data.size(); x++){
el_cart.expandGroup(x);
}
adapter.setOnCartListChangeListener(new MyAdapter.onCartListChangeListener() {
@Override
public void onSellerCheckedChange(int i) {
//商家被点击
boolean currentSellerAllProductSelected = adapter.isCurrentSellerAllProductSelected(i);
adapter.changeCurrentSellerAllProductsStatus(i, !currentSellerAllProductSelected);
adapter.notifyDataSetChanged();
//B.刷新底部数据
refreshSelectedAndTotalPriceAndTotalNumber();
}
@Override
public void onProductCheckedChange(int i, int i1) {
//点击商品得checkbox
adapter.changeCurrentProductStatus(i,i1);
adapter.notifyDataSetChanged();
//B.刷新底部数据
refreshSelectedAndTotalPriceAndTotalNumber();
}
@Override
public void onProducNumberChange(int i, int i1, int number) {
//当加减被点击
adapter.changeCurrentProductNumber(i,i1,number);
adapter.notifyDataSetChanged();
//B.刷新底部数据
refreshSelectedAndTotalPriceAndTotalNumber();
}
});
}
}
});
}
//B.刷新checkbox状态和总价和总数量
private void refreshSelectedAndTotalPriceAndTotalNumber() {
//去判断是否所有得商品都被选中
boolean allProductsSelected = adapter.isAllProductsSelected();
//设置给全选checkBox
cb_cart_all_select.setChecked(allProductsSelected);
//计算总价
float totalPrice = adapter.calculateTotalPrice();
tv_cart_total_price.setText("总价 " + totalPrice);
//计算总数量
int totalNumber = adapter.calculateTotalNumber();
btn_cart_pay.setText("去结算(" + totalNumber + ")");
}
//初始化的操作
private void initView() {
el_cart = (ExpandableListView) findViewById(R.id.el_cart);
cb_cart_all_select = (CheckBox) findViewById(R.id.cb_cart_all_select);
tv_cart_total_price = (TextView) findViewById(R.id.tv_cart_total_price);
btn_cart_pay = (Button) findViewById(R.id.btn_cart_pay);
cb_cart_all_select.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.cb_cart_all_select:
//底部全选按钮
//时候所有得商品都被选中
boolean allProductsSelected = adapter.isAllProductsSelected();
adapter.changeAllProductStatus(!allProductsSelected);
adapter.notifyDataSetChanged();
//刷新底部数据
refreshSelectedAndTotalPriceAndTotalNumber();
break;
}
}
}

public class MyAdapter extends BaseExpandableListAdapter{
private List<CartInfo.DataBean  list;
public MyAdapter(List<CartInfo.DataBean  data) {
list=data;
}
@Override
public int getGroupCount() {
return list==null ? 0 : list.size();
}
@Override
public int getChildrenCount(int i) {
return list.get(i).getList()==null ? 0 :list.get(i).getList().size();
}
@Override
public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {
//先拿到Bean里组的数据,看hiJson
CartInfo.DataBean dataBean = list.get(i);
ParentViewHolder parentViewHolder;
if (view == null) {
view = View.inflate(viewGroup.getContext(), R.layout.item_cart_parent, null);
parentViewHolder = new ParentViewHolder(view);
view.setTag(parentViewHolder);
} else {
parentViewHolder = (ParentViewHolder) view.getTag();
}
parentViewHolder.seller_name_tv.setText(dataBean.getSellerName());
boolean currentSellerAllProductSelected = isCurrentSellerAllProductSelected(i);
parentViewHolder.seller_cb.setChecked(currentSellerAllProductSelected);
//D.设置点击CheckBox
parentViewHolder.seller_cb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnCartListChangeListener !=null){
mOnCartListChangeListener.onSellerCheckedChange(i);
}
}
});
return view;
}
@Override
public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  list1 = dataBean.getList();
CartInfo.DataBean.ListBean listBean = list1.get(i1);
ChildViewHolder childViewHolder;
if (view == null) {
view = View.inflate(viewGroup.getContext(), R.layout.item_cart_child, null);
childViewHolder = new ChildViewHolder(view);
view.setTag(childViewHolder);
} else {
childViewHolder=(ChildViewHolder)view.getTag();
}
//设置商品名字
childViewHolder.product_title_name_tv.setText(listBean.getTitle());
//设置商品单价
childViewHolder.product_price_tv.setText(listBean.getPrice()+"");
//设置复选框是否选中
childViewHolder.child_cb.setChecked(listBean.getSelected() == 1);
//设置组合式自定义控件内部的数量
childViewHolder.add_remove_view.setNumber(listBean.getNum());
//D.设置商品CheckBox的点击事件,通过接口回调,暴露给外面
childViewHolder.child_cb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnCartListChangeListener != null){
mOnCartListChangeListener.onProductCheckedChange(i,i1);
}
}
});
//D.设置商品数量的点击事件,通过接口回调,暴露给外面
childViewHolder.add_remove_view.setOnNumberChangeListener(new AddSubView.OnNumberChangeListener() {
@Override
public void onNumberChange(int num) {
if (mOnCartListChangeListener !=null){
mOnCartListChangeListener.onProducNumberChange(i,i1,num);
}
}
});
return view;
}
public boolean isCurrentSellerAllProductSelected(int i){//根据商品改变商家--如果商品全部选中商家则选中--有一个商品没选中则商家不选中
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  beans = dataBean.getList();
for (CartInfo.DataBean.ListBean bean : beans){
if (bean.getSelected()==0){
return false;
}
}
return true;
}
public boolean isAllProductsSelected(){ //根据商品改变全选--如果商品全部选中全选则选中--有一个商品没选中则全选不选中
for (int x=0;x<list.size();x++){
CartInfo.DataBean dataBean = list.get(x);
List<CartInfo.DataBean.ListBean  list1 = dataBean.getList();
for (int j=0;j<list1.size();j++){
if (list1.get(j).getSelected()==0){
return false;
}
}
}
return true;
}
public int calculateTotalNumber(){ //计算总数量
int totalNumber=0;
for (int i=0;i<list.size();i++){
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  list1 = dataBean.getList();
for (int j=0;j<list1.size();j++){
if (list1.get(j).getSelected()==1){
int num = list1.get(j).getNum();
totalNumber+=num;
}
}
}
return totalNumber;
}
public float calculateTotalPrice(){ //获取总价
float totalPrice=0;
for (int i=0;i<list.size();i++){
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  list = dataBean.getList();
for (int j=0;j<list.size();j++){
if (list.get(j).getSelected()==1){
float price = list.get(j).getPrice();
int num = list.get(j).getNum();
totalPrice+=price*num;
}
}
}
return totalPrice;
}
//C.当商品组的全选框点击时,更新所有商品的状态
public void changeCurrentSellerAllProductsStatus(int i,boolean isSelected){
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  beans = dataBean.getList();
for (int j=0;j<beans.size();j++){
CartInfo.DataBean.ListBean bean = beans.get(j);
bean.setSelected(isSelected ?1 :0);
}
}
//C.当商家子条目的全选框选中时,更新其状态
public void changeCurrentProductStatus(int i , int i1){
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  list = dataBean.getList();
CartInfo.DataBean.ListBean listBean = list.get(i1);
listBean.setSelected(listBean.getSelected() == 0 ? 1 : 0 );
}
//C.设置所有商品的状态
public void changeAllProductStatus(boolean selected){
for(int x=0; x<list.size() ; x++){
CartInfo.DataBean dataBean = list.get(x);
List<CartInfo.DataBean.ListBean  list = dataBean.getList();
for(int j=0; j<list.size(); j++){
list.get(j).setSelected(selected ? 1 : 0);
}
}
}
//C.当加减器被点击时,调用,改变里面当前商品的数量 参数1定位那个商家  参数2定位哪个商品 参数3定位改变具体的数量是多少
public void changeCurrentProductNumber(int i,int i1,int number){
CartInfo.DataBean dataBean = list.get(i);
List<CartInfo.DataBean.ListBean  list = dataBean.getList();
CartInfo.DataBean.ListBean listBean = list.get(i1);
listBean.setNum(number);
}
public interface onCartListChangeListener{
/**
* 当商家的checkBox点击时回调
*/
void onSellerCheckedChange(int i);
/**
* 当点击子条目商品的CheckBox回调
*/
void onProductCheckedChange(int i ,int i1);
/**
* 当点击加减按钮的回调
*/
void onProducNumberChange(int i , int i1 , int number);
}
//D.
onCartListChangeListener mOnCartListChangeListener;
//D.
public void setOnCartListChangeListener(onCartListChangeListener onCartListChangeListener){
mOnCartListChangeListener = onCartListChangeListener ;
}
public static class ParentViewHolder {
public CheckBox seller_cb;
public TextView seller_name_tv;
public ParentViewHolder(View rootView) {
this.seller_cb = (CheckBox) rootView.findViewById(R.id.seller_cb);
this.seller_name_tv = (TextView) rootView.findViewById(R.id.seller_name_tv);
}
}
public static class ChildViewHolder {
public CheckBox child_cb;
public ImageView product_icon_iv;
public TextView product_title_name_tv;
public TextView product_price_tv;
public AddSubView add_remove_view;
public ChildViewHolder(View rootView) {
this.child_cb = (CheckBox) rootView.findViewById(R.id.child_cb);
this.product_icon_iv = (ImageView) rootView.findViewById(R.id.product_icon_iv);
this.product_title_name_tv = (TextView) rootView.findViewById(R.id.product_title_name_tv);
this.product_price_tv = (TextView) rootView.findViewById(R.id.product_price_tv);
this.add_remove_view = (AddSubView) rootView.findViewById(R.id.add_remove_view);
}
}
@Override
public Object getGroup(int i) {
return null;
}
@Override
public Object getChild(int i, int i1) {
return null;
}
@Override
public long getGroupId(int i) {
return 0;
}
@Override
public long getChildId(int i, int i1) {
return 0;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return false;
}
}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" 
<ExpandableListView
android:id="@+id/el_cart"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginBottom="60dp" / 
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:background="#eeeeee"
android:gravity="center_vertical" 
<CheckBox
android:id="@+id/cb_cart_all_select"
android:layout_width="wrap_content"
android:layout_height="wrap_content" / 
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="全选" / 
<TextView
android:id="@+id/tv_cart_total_price"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:paddingLeft="20dp"
android:text="合计:¥0.00" / 
<Button
android:id="@+id/btn_cart_pay"
android:layout_width="100dp"
android:layout_height="match_parent"
android:text="去结算(0)" / 
</LinearLayout 
</RelativeLayout 

public class AddSubView extends LinearLayout implements View.OnClickListener{  //组合式控件
private int number = 1;
private TextView sub_tv;
private TextView product_number_tv;
private TextView add_tv;
public AddSubView(Context context) {
this(context,null);
}
public AddSubView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs,0);
}
public AddSubView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
View view = inflate(context, R.layout.add_remove, this);
sub_tv=view.findViewById(R.id.sub_tv);
product_number_tv=view.findViewById(R.id.product_number_tv);
add_tv=view.findViewById(R.id.add_tv);
sub_tv.setOnClickListener(this);
add_tv.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.sub_tv:
if (number 1){
--number;
product_number_tv.setText(number+"");
if (onNumberChangeListener!=null){
onNumberChangeListener.onNumberChange(number);
}
}else {
Toast.makeText(getContext(), "不能再少了", Toast.LENGTH_SHORT).show();
}
break;
case R.id.add_tv:
if (number<8){
++number;
product_number_tv.setText(number+"");
if (onNumberChangeListener!=null){
onNumberChangeListener.onNumberChange(number);
}
}else {
Toast.makeText(getContext(), "不能再多了", Toast.LENGTH_SHORT).show();
}
break;
}
}
public int getNumber() {
return number;
}
public void setNumber(int number) {
this.number = number;
product_number_tv.setText(number + "");
}
OnNumberChangeListener onNumberChangeListener;
public void setOnNumberChangeListener(OnNumberChangeListener onNumberChangeListener) {
this.onNumberChangeListener = onNumberChangeListener;
}
interface OnNumberChangeListener {
void onNumberChange(int num);
}
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:padding="2dp"
android:layout_marginLeft="10dp"
android:layout_width="60dp"
android:layout_height="30dp"
android:layout_gravity="center_vertical"
android:background="#99000000"
android:gravity="center_vertical" 
<TextView
android:background="#ffffff"
android:layout_weight="1"
android:id="@+id/sub_tv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center"
android:text="-"
android:textSize="16sp" / 
<TextView
android:text="1"
android:layout_marginLeft="2dp"
android:background="#ffffff"
android:layout_weight="1"
android:id="@+id/product_number_tv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center"
/ 
<TextView
android:layout_marginLeft="2dp"
android:background="#ffffff"
android:layout_weight="1"
android:id="@+id/add_tv"
android:layout_width="0dp"
android:layout_height="match_parent"
android:gravity="center"
android:text="+"
android:textSize="16sp" / 
</LinearLayout 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"   //商家条目
android:layout_width="match_parent"
android:layout_height="60dp"
android:gravity="center_vertical"
<CheckBox
android:id="@+id/seller_cb"
android:layout_width="wrap_content"
android:layout_height="wrap_content" / 
<TextView
android:id="@+id/seller_name_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp" / 
</LinearLayout 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="120dp"
android:gravity="center_vertical" 
<CheckBox
android:id="@+id/child_cb"
android:layout_width="wrap_content"
android:layout_height="wrap_content" / 
<ImageView
android:id="@+id/product_icon_iv"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_marginLeft="20dp"
android:scaleType="centerCrop"
android:src="@color/colorPrimary" / 
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:orientation="vertical" 
<TextView
android:id="@+id/product_title_name_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ellipsize="end"
android:maxLines="2"
android:text="商品标题" / 
<TextView
android:id="@+id/product_price_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="¥0.0" / 
</LinearLayout 
<fanruiqi.bwie.com.shopcat.AddSubView
android:id="@+id/add_remove_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp" / 
</LinearLayout 

public class OkhtttpUtils {
private static OkhtttpUtils mOkhtttpUtils;
private OkHttpClient mOkHttpClien;
private final Handler mHandler;
private OkhtttpUtils() {
//创建一个主线程的handler
mHandler = new Handler(Looper.getMainLooper());
mOkHttpClien = new OkHttpClient.Builder()
.connectTimeout(5000, TimeUnit.MILLISECONDS)
.readTimeout(5000, TimeUnit.MILLISECONDS)
.writeTimeout(5000, TimeUnit.MILLISECONDS)
.build();
}
//单例模式
public static OkhtttpUtils getInstance() {
if (mOkhtttpUtils == null) {
synchronized (OkhtttpUtils.class) {
if (mOkhtttpUtils == null) {
return mOkhtttpUtils = new OkhtttpUtils();
}
}
}
return mOkhtttpUtils;
}
public interface OkCallback {
void onFailure(Exception e);
void onResponse(String json);
}
public void doPost(String url, Map<String, String  map, final OkCallback okCallback) {
//创建FormBody的对象,把表单添加到formBody中
FormBody.Builder builder = new FormBody.Builder();
if (map != null) {
for (String key : map.keySet()) {
builder.add(key, map.get(key));
}
}
FormBody formBody = builder.build();
//创建Request对象
Request request = new Request.Builder()
.post(formBody)
.url(url)
.build();
//创建Call对象
final Call call = mOkHttpClien.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, final IOException e) {
if (okCallback != null) {
//切换到主线程
mHandler.post(new Runnable() {
@Override
public void run() {
okCallback.onFailure(e);
}
});
}
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
try {
if (response != null && response.isSuccessful()) {
final String json = response.body().string();
mHandler.post(new Runnable() {
@Override
public void run() {
if (okCallback != null) {
okCallback.onResponse(json);
return;
}
}
});
}
} catch (IOException e) {
e.printStackTrace();
}
if (okCallback != null) {
okCallback.onFailure(new Exception("网络异常"));
}
}
});
}
//封装doGet的网络请求
public void doGet(String url, final OkCallback okCallback) {
Request request = new Request.Builder()
.get()
.url(url)
.build();
final Call call = mOkHttpClien.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, final IOException e) {
if (okCallback != null) {
//切换到主线程
mHandler.post(new Runnable() {
@Override
public void run() {
okCallback.onFailure(e);
}
});
}
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
try {
if (response != null && response.isSuccessful()) {
final String json = response.body().string();
mHandler.post(new Runnable() {
@Override
public void run() {
if (okCallback != null) {
okCallback.onResponse(json);
return;
}
}
});
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}