仿京东电商 简单的购物车

先是布局

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.administrator.my1024.MainActivity">

    <TextView
        android:gravity="center"
        android:text="购物车"
        android:textSize="20sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
      />
    <com.jcodecraeer.xrecyclerview.XRecyclerView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:id="@+id/xrecye"
        ></com.jcodecraeer.xrecyclerview.XRecyclerView>

    <LinearLayout
        android:gravity="center_vertical"
        android:padding="10dp"
        android:orientation="horizontal"
        android:layout_alignParentBottom="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/allCheckBox"/>
        <TextView
            android:textStyle="bold"
            android:layout_marginLeft="10dp"
            android:textSize="20sp"
            android:text="全选"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <LinearLayout
            android:padding="10dp"
            android:layout_marginLeft="10dp"
            android:layout_weight="1"
            android:orientation="vertical"
            android:layout_width="0dp"
            android:layout_height="wrap_content">
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:orientation="horizontal">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:textSize="20sp"
                    android:textColor="#e53e42"
                    android:text="总价 :￥"/>
                <TextView
                    android:layout_width="70dp"
                    android:layout_height="25dp"
                    android:id="@+id/sumprice"
                    android:textSize="18sp"
                    android:text="0"
                    android:textColor="#e53e42"/>
            </LinearLayout>
        </LinearLayout>
        <TextView
            android:layout_width="70dp"
            android:layout_height="40dp"
            android:id="@+id/buy"
            android:text="去结算"
            android:gravity="center"
            android:textColor="#fff"
            android:background="#ff00"
            />
    </LinearLayout>
</LinearLayout>

car_item_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        android:padding="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <CheckBox
            android:id="@+id/sellerCheckbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <TextView
            android:id="@+id/sellerNameTv"
            android:text="商家"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#999999"/>
    <android.support.v7.widget.RecyclerView
        android:id="@+id/productXRV"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"></android.support.v7.widget.RecyclerView>

</LinearLayout>

item_produvt_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <LinearLayout
        android:padding="10dp"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <CheckBox
                android:id="@+id/productCheckBox"
                android:layout_gravity="center"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
            <ImageView
                android:layout_width="80dp"
                android:layout_height="80dp"
                android:id="@+id/product_icon"
                android:src="@mipmap/ic_launcher"/>
        </LinearLayout>
        <LinearLayout
            android:orientation="vertical"
            android:layout_gravity="center"
            android:layout_marginLeft="10dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="商品标题"
                android:id="@+id/title"/>
            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="10dp"
                >
                <TextView
                    android:id="@+id/price"
                    android:layout_alignParentLeft="true"
                    android:text="优惠价 :99.99"
                    android:textColor="#ff0000"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content" />

                <com.example.administrator.my1024.zidingyi.My_add_reduce
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/jiajianqi"
                    android:layout_alignParentRight="true">

                </com.example.administrator.my1024.zidingyi.My_add_reduce>
            </RelativeLayout>
        </LinearLayout>
    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="#999999"
        android:layout_marginTop="5dp"/>
</LinearLayout>

num_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="horizontal"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="@drawable/jia_jian_bg"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/jian"
        android:text="-"
        android:textSize="25dp"
        android:padding="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <View
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:background="#999999"/>

    <EditText
        android:id="@+id/num"
        android:layout_weight="1"
        android:text="1"
        android:gravity="center"
        android:background="#00000000"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <View
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:background="#999999"/>

    <TextView
        android:id="@+id/jia"
        android:text="+"
        android:textSize="25dp"
        android:padding="5dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Java代码

Api

public class Api {
    public final static String BASE_URL = "http://www.zhaoapi.cn/";
    public final static String CART_URL = BASE_URL+"product/getCarts";
}

ICartApi

public interface ICartApi {
    @GET()
    Observable<CartBean> cart(@Url String url, @Query( "uid" ) String uid);
}

MyApp

public class MyApp extends Application{
    @Override
    public void onCreate() {
        super.onCreate();
        Fresco.initialize( this );
    }
}

CartAllCheckLinstener

public interface CartAllCheckLinstener {
    void notifyAllCheckboxStantus();
}

CheckListener

public interface CheckListener {
    void notifyAParpen();
}

RetorfitUtil

public class RetorfitUtil {
    private static String BASE_URL = "https://www.zhaoapi.cn/";
    private final Retrofit retrofit;
    public static class SingleHolder{
        private static final RetorfitUtil _INSTACE = new RetorfitUtil(BASE_URL);
    }
    public static RetorfitUtil getDefault(){
        return SingleHolder._INSTACE;
    }
    public RetorfitUtil(String baseUrl){
        retrofit = new Retrofit.Builder()
                .baseUrl( baseUrl )
                .addConverterFactory( GsonConverterFactory.create(  ) )
                .addCallAdapterFactory( RxJava2CallAdapterFactory.create() )
                .client( bulidokhttpclient() )
                .build();
    }
    private OkHttpClient bulidokhttpclient(){
        OkHttpClient client = new OkHttpClient.Builder()
                .build();
        return client;
    }
    public <T> T create(Class<T> Clazz){
        return retrofit.create( Clazz );
    }
}

IView

public interface IView {
    void Success(CartBean cartBean);
    void Failure(String msg);
}

IModel

public class IModel {
    public Observable<CartBean> cart(String url,String uid){
        return RetorfitUtil.getDefault().create( ICartApi.class ).cart( url,uid );
    }
}

IProsenter

public class IProsenter {
    private IModel iModel;
    IView mIview;
    public IProsenter(IView iView){
        mIview = iView;
        iModel = new IModel();
    }
    public void getCart(String uid){
        iModel.cart( Api.CART_URL,uid )
                .subscribeOn( Schedulers.io() )
                .observeOn( AndroidSchedulers.mainThread() )
                .subscribe( new Observer<CartBean>() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(CartBean value) {
                    mIview.Success( value );
                    }

                    @Override
                    public void onError(Throwable e) {
                    mIview.Failure( e.toString() );
                    }

                    @Override
                    public void onComplete() {

                    }
                } );
    }
}

MainActivity

public class MainActivity extends AppCompatActivity implements IView,CartAllCheckLinstener{

    @BindView(R.id.xrecye)
    XRecyclerView xrecye;
    @BindView(R.id.allCheckBox)
    CheckBox allCheckBox;
    @BindView(R.id.sumprice)
    TextView sumprice;
    @BindView(R.id.buy)
    TextView buy;
    private Unbinder unbinder;
    private IProsenter prosenter;
    private List<CartBean.DataBean> list;
    private String uid = "71";
    private CartAdapter cartAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.activity_main );
        unbinder = ButterKnife.bind( this );
        initData();
        initView();
    }
    private void initView() {
        list = new ArrayList<>(  );
        xrecye.setLayoutManager( new LinearLayoutManager( this ) );
        allCheckBox.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (allCheckBox.isChecked()){
                    if (list !=null&&list.size()>0){
                        for (int i = 0;i<list.size();i++){
                            list.get( i ).setSelected( true );
                            for (int i1 = 0;i1<list.get( i ).getList().size();i1++){
                                list.get( i ).getList().get( i1 ).setSelected( true );
                            }
                        }
                    }
                }else {
                    if (list !=null&&list.size()>0){
                        for (int i = 0;i<list.size();i++){
                            list.get( i ).setSelected( false );
                            for (int i1 = 0;i1<list.get( i ).getList().size();i1++){
                                list.get( i ).getList().get( i1 ).setSelected( false );
                            }
                        }
                    }
                }
                cartAdapter.notifyDataSetChanged();
                totalPrice();
            }
        } );
    }
    private void initData() {
        prosenter = new IProsenter( this );
        prosenter.getCart( uid );
    }
    @Override
    public void notifyAllCheckboxStantus() {
        StringBuilder stringBuilder = new StringBuilder(  );
        if (cartAdapter!=null){
            for (int i = 0;i<cartAdapter.getCartList().size();i++){
                stringBuilder.append( cartAdapter.getCartList().get( i ).isSelected() );
                for (int i1 = 0;i1<cartAdapter.getCartList().get( i ).getList().size();i1++){
                    stringBuilder.append(cartAdapter.getCartList().get(i).getList().get(i1).isSelected());
                }
            }
        }
        if (stringBuilder.toString().contains( "false" )){
            allCheckBox.setChecked( false );
        }else {
            allCheckBox.setChecked( true );
        }
        totalPrice();
    }
    @Override
    public void Success(CartBean cartBean) {
        if (cartBean!=null&&cartBean.getData()!=null){
            list = cartBean.getData();
            cartAdapter = new CartAdapter( this,list );
            xrecye.setAdapter( cartAdapter );
        }
        cartAdapter.setCartAllCheckLinstener( this );
    }
    @Override
    public void Failure(String msg) {
    }
    private void totalPrice() {
        double totalprice = 0;
        for (int i = 0;i<cartAdapter.getCartList().size();i++){
            for (int i1 = 0;i1<cartAdapter.getCartList().get( i ).getList().size();i1++){
                if (cartAdapter.getCartList().get( i ).getList().get( i1 ).isSelected()){
                    CartBean.DataBean.ListBean listBean = cartAdapter.getCartList().get( i ).getList().get( i1 );
                    totalprice += listBean.getBargainPrice()*listBean.getTotalNum();
                }
            }
        }
        sumprice.setText( ""+totalprice );
    }
}

CartAdapter

public class CartAdapter extends RecyclerView.Adapter<CartAdapter.CartViewHolder> implements CheckListener,ItemTouchHelperAdapter {

    private Context mContext;
    private List<CartBean.DataBean> cartList;
    private CheckListener checkListener;
    private CartAllCheckLinstener cartAllCheckLinstener;

    public CartAdapter(Context Context, List<CartBean.DataBean> list) {
        mContext = Context;
        cartList = list;
    }
    public void setCartAllCheckLinstener(CartAllCheckLinstener cartAllCheckLinstener){
        this.cartAllCheckLinstener = cartAllCheckLinstener;
    }
    @NonNull
    @Override
    public CartAdapter.CartViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from( mContext ).inflate( R.layout.car_item_layout,parent,false );
        CartViewHolder viewHolder = new CartViewHolder( itemView );
        return viewHolder;
    }
    @Override
    public void onBindViewHolder(@NonNull final CartAdapter.CartViewHolder holder, int position) {
        final CartBean.DataBean bean = cartList.get( position );
        holder.nameTv.setText( bean.getSellerName() );
        holder.checkBox.setChecked( bean.isSelected() );

        holder.productXRV.setLayoutManager( new LinearLayoutManager( mContext ) );
        final  ProductAdapter productAdapter = new ProductAdapter( mContext,bean.getList() );
        holder.productXRV.setAdapter( productAdapter );
        productAdapter.setCheckListener( this );
        for (int i = 0; i<bean.getList().size();i++){
            if (!bean.getList().get( i ).isSelected()){
                holder.checkBox.setChecked( false );
                break;
            }else {
                holder.checkBox.setChecked( true );
            }
        }
        holder.checkBox.setOnClickListener( new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (holder.checkBox.isChecked()){
                    bean.setSelected( true );
                    for (int i = 0;i<bean.getList().size();i++){
                        bean.getList().get( i ).setSelected( false );
                    }
                }
                notifyDataSetChanged();
                if (cartAllCheckLinstener!=null){
                    cartAllCheckLinstener.notifyAllCheckboxStantus();
                }
            }
        } );
    }
    public List<CartBean.DataBean> getCartList(){
        return cartList;
    }
    @Override
    public int getItemCount() {
        return cartList.size()==0?0:cartList.size();
    }

    @Override
    public void notifyAParpen() {
        notifyDataSetChanged();
        if (cartAllCheckLinstener!=null){
            cartAllCheckLinstener.notifyAllCheckboxStantus();
        }
    }

    @Override
    public void onItemMove(int fromPosition, int toPosition) {
        Collections.swap(cartList,fromPosition,toPosition);
        notifyItemMoved(fromPosition,toPosition);
    }
    @Override
    public void onItemDismiss(int position) {
        cartList.remove( position );
        notifyItemRemoved( position );
    }
    public class CartViewHolder extends RecyclerView.ViewHolder{
        private CheckBox checkBox;
        private TextView nameTv;
        private RecyclerView productXRV;
        public CartViewHolder(View itemView) {
            super( itemView );
            checkBox = itemView.findViewById( R.id.sellerCheckbox );
            nameTv = itemView.findViewById( R.id.sellerNameTv );
            productXRV = itemView.findViewById( R.id.productXRV );
        }
    }
}

ProductAdapter

public class ProductAdapter extends RecyclerView.Adapter<ProductAdapter.CartViewHolder> {
   private Context mContext;
   private List<CartBean.DataBean.ListBean> listBeanList;
   private CheckListener checkListener;
   private CartAllCheckLinstener cartAllCheckLinstener;

   public ProductAdapter(Context context,List<CartBean.DataBean.ListBean> list){
       mContext = context;
       listBeanList = list;
   }
   public void setCheckListener(CheckListener checkListener){
       this.checkListener = checkListener;
   }
   public void setCartAllCheckLinstener(CartAllCheckLinstener cartAllCheckLinstener){
       this.cartAllCheckLinstener = cartAllCheckLinstener;

   }


    @NonNull
    @Override
    public ProductAdapter.CartViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
       View itemView = LayoutInflater.from( mContext ).inflate(  R.layout.item_produvt_layout,parent,false);
       CartViewHolder viewHolder = new CartViewHolder( itemView );
       return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ProductAdapter.CartViewHolder holder, int position) {
            final  CartBean.DataBean.ListBean bean = listBeanList.get( position );
            holder.priceTv.setText( "优惠价 : ￥"+bean.getBargainPrice() );
            holder.titleTv.setText( bean.getTitle() );
            String[] imgs = bean.getImages().split( "\\|" );
            if (imgs!=null &&imgs.length>0){
                Glide.with( mContext ).load( imgs[0] ).into( holder.prductIv );
            }else {
                holder.prductIv.setImageResource( R.mipmap.ic_launcher );
            }
            holder.checkBox.setChecked( bean.isSelected() );

            holder.myAddReduce.setNumEt( bean.getTotalNum() );

            holder.myAddReduce.setJiaJianLinstener( new My_add_reduce.JiaJianLinstener() {
                @Override
                public void getNum(int num) {
                    bean.setTotalNum( num );
                    if (checkListener!=null){
                        checkListener.notifyAParpen();
                    }
                }
            } );
            holder.checkBox.setOnClickListener( new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (holder.checkBox.isChecked()){
                        bean.setSelected( true );
                    }else {
                        bean.setSelected( false );
                    }
                    if (checkListener!=null){
                        checkListener.notifyAParpen();
                    }
                }
            } );
    }
    @Override
    public int getItemCount() {
        return listBeanList.size()==0?0:listBeanList.size();
    }
    public class CartViewHolder extends RecyclerView.ViewHolder{
       private CheckBox checkBox;
       private TextView titleTv,priceTv;
       private ImageView prductIv;
       private My_add_reduce myAddReduce;

        public CartViewHolder(View itemView) {
            super( itemView );
            checkBox = itemView.findViewById( R.id.productCheckBox );
            titleTv = itemView.findViewById( R.id.title );
            priceTv = itemView.findViewById( R.id.price );
            prductIv = itemView.findViewById( R.id.product_icon );
            myAddReduce = itemView.findViewById( R.id.jiajianqi );
        }
    }
}