仿京东购物车——

//布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.1"
        >
        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:id="@+id/cb"
            />
    </LinearLayout>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.5"
        android:orientation="horizontal"
        >
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            >
            <com.facebook.drawee.view.SimpleDraweeView
                android:layout_width="80dp"
                android:layout_height="80dp"
                android:id="@+id/sim"
                />
        </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/name"
                />
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:id="@+id/price"
                android:textColor="#ff00"
                />
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.25"
        android:orientation="horizontal"
        >
        <Button
            android:layout_width="30dp"
            android:layout_marginTop="30dp"
            android:layout_height="wrap_content"
            android:text="-"
            android:id="@+id/jian"

            />

        <TextView
            android:layout_width="30dp"
            android:layout_marginTop="30dp"
            android:textSize="20sp"
            android:layout_height="wrap_content"
            android:text="0"
            android:id="@+id/zong"
            />
        <Button
            android:layout_width="30dp"
            android:layout_marginTop="30dp"
            android:layout_height="wrap_content"
            android:text="+"
            android:id="@+id/jia"

            />
    </LinearLayout>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="0.15"
        android:orientation="horizontal"
        >

        <Button
            android:layout_width="30dp"
            android:layout_height="30dp"
            android:id="@+id/shan"
            android:background="@drawable/rublish"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="30dp"

            />
    </LinearLayout>

</LinearLayout>

//我这里用的MVP就不一一介绍了我直接显示Api retrofit的使用

//查询

@GET( "getCarts")

Call<GoodsBean>doGet( @Query( "uid") int uid, @Query( "source") String source);

//最主要更新运用到加、减、全选

@GET( "updateCarts")Call<UpBean>update( @Query( "uid") int uid, @QueryMap Map<String,String> params);

//删除

@GET( "product/deleteCart")Call<DeleteBean> del( @Query( "uid") String uid, @Query( "pid") String pid);

//单例

public class HttpUtils {

public static HttpUtils instance;

private Retrofit retrofit;

private HttpUtils(String uri){

retrofit = new Retrofit.Builder()

.baseUrl(uri)

.addConverterFactory(GsonConverterFactory. create())

.build();

}

public static HttpUtils getInstance(String uri){

if( instance== null){

synchronized (HttpUtils. class){

if( null== instance){

instance = new HttpUtils(uri);

}

return instance;

}

public ApiServers getApi(){

return retrofit.create(ApiServers. class);

}

//主界面内容

public class MainActivity extends AppCompatActivity implements LogView {

private Handler handler = new Handler(){

@Override public void handleMessage(Message msg) {

if (msg. what== 0){

//价格和数量的Bean类并且赋值

CountPriceBean countAndPrice = (CountPriceBean) msg. obj;

text_heji.setText( "￥"+countAndPrice.getPriceString());

text_jiesuan.setText( "结算("+countAndPrice.getCount()+ ")");

}

};

String uri= "http://120.27.23.105/product/";

private ExpandableListView ex;

private ChaXunAdapter adapter;

private MyPresenterView myPresenterView;

private CheckBox check_quanxuan;

private TextView text_heji;

private TextView text_jiesuan;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout. activity_main);

ex = findViewById(R.id. expanded_view);

check_quanxuan = findViewById(R.id. check_quanxuan);

text_heji = findViewById(R.id. text_heji);

text_jiesuan = findViewById(R.id. text_jiesuan);

//这里调用的p城的方法并且把网址回去

myPresenterView = new MyPresenter( this);

myPresenterView.setNet( uri);

//全选

check_quanxuan.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View v) {

adapter.isAllCheckChild( check_quanxuan.isChecked());

}

});

}

//这里是Logview自己的方法

@Override

public void toBackView(List<GoodsBean.DataBean> data) {

if (data != null) {

//默认二级条目全选

for ( int i= 0;i<data.size();i++){

if (isChildCheck(i,data)){

data.get(i).setGroup_check( true);

}

//全选图片默认选中

check_quanxuan.setChecked(isAllChildCheck(data));

//适配器

adapter = new ChaXunAdapter(MainActivity. this, data, myPresenterView, handler);

ex.setAdapter( adapter);

for ( int i = 0; i < data.size(); i++) {

//默认展开

ex.expandGroup(i);

}

//这里是适配器里面的总价方法

adapter.sendPriceAndCount();

} else {

Toast. makeText(MainActivity. this, "购物车空，请添加购物车", Toast. LENGTH_SHORT).show();

}

//全选图片默认选中

private boolean isAllChildCheck(List<GoodsBean.DataBean> data) {

for ( int i= 0;i<data.size();i++){

if(!data.get(i).isGroup_check()){

return false;

}

return true;

}

//默认二级条目全选

private boolean isChildCheck( int i, List<GoodsBean.DataBean> data) {

GoodsBean.DataBean dataBean = data.get(i);

for ( int j= 0;j<dataBean.getList().size();j++){

if (dataBean.getList().get(j).getSelected()== 0){

return false;

}

return true;

}

//适配器

public class ChaXunAdapter extends BaseExpandableListAdapter {

Context context;

List<GoodsBean.DataBean> data;

private int childIndex;

private MyPresenterView myPresenterView;

private Handler handler;

private int allIndex;

//适配的参数

public ChaXunAdapter(Context context, List<GoodsBean.DataBean> data, MyPresenterView myPresenterView, Handler handler) {

this. context=context;

this. data=data;

this. myPresenterView = myPresenterView;

this. handler = handler;

}

@Override

public int getGroupCount() {

return data.size();

}

@Override

public int getChildrenCount( int groupPosition) {

return 1;

}

@Override

public Object getGroup( int groupPosition) {

return data.get(groupPosition);

}

@Override

public Object getChild( int groupPosition, int childPosition) {

return data.get(groupPosition).getList().get(childPosition);

}

@Override

public long getGroupId( int groupPosition) {

return groupPosition;

}

@Override

public long getChildId( int groupPosition, int childPosition) {

return childPosition;

}

@Override

public boolean hasStableIds() {

return false;

}

//二级

@Override

public View getGroupView( int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

final GroupHolder holder;

if (convertView== null){

convertView = View. inflate( context, R.layout. buju, null);

holder = new GroupHolder();

holder. check = convertView.findViewById(R.id. check);

holder. title = convertView.findViewById(R.id. title);

convertView.setTag(holder);

} else{

holder = (GroupHolder) convertView.getTag();

}

//二级列表赋值

//多选框和名字

//获得二级条目的名字

final GoodsBean.DataBean dataBean = data.get(groupPosition);

holder. check.setChecked( data.get(groupPosition).isGroup_check());

holder. title.setText( data.get(groupPosition).getSellerName());

//多选框的点击事件

//到下面与二级子条目想连接

//默认选中的话取消不了

holder. check.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View v) {

//定义一个变量

childIndex = 0;

//传入点击事件和二级条目的bean集合

childCheck( holder. check.isChecked(), dataBean);

}

});

return convertView;

}

//点击二级的多选框

//默认选中的取消不了

private void childCheck( final boolean checked, final GoodsBean.DataBean dataBean) {

//更新传入变量的值

GoodsBean.DataBean.ListBean listBean = dataBean.getList().get( childIndex);

Map<String,String> params = new HashMap<>();

params.put( "sellerid", String. valueOf(listBean.getSellerid()));

params.put( "pid", String. valueOf(listBean.getPid()));

params.put( "selected", String. valueOf(checked ? 1 : 0));

params.put( "num", String. valueOf(listBean.getNum()));

ApiServers api = HttpUtils. getInstance( "http://120.27.23.105/product/").getApi();

api.update( 75,params).enqueue( new Callback<UpBean>() {

@Override

public void onResponse(Call<UpBean> call, Response<UpBean> response) {

//点击更新条目进行京东数据更新

childIndex++;

if ( childIndex< dataBean.getList().size()){

childCheck( checked, dataBean);

} else{

//传入到p城的网址

myPresenterView.setNet( "http://120.27.23.105/product/");

}

@Override

public void onFailure(Call<UpBean> call, Throwable t) { } }); }

//二级子列表

@Override

public View getChildView( int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

final MyHolder holder;

if(convertView== null){

convertView = View. inflate( context, R.layout. bujuer, null);

holder = new MyHolder();

holder. cb = convertView.findViewById(R.id. cb);

holder. jia =convertView.findViewById(R.id. jia);

holder. jian = convertView.findViewById(R.id. jian);

holder. name = convertView.findViewById(R.id. name);

holder. price = convertView.findViewById(R.id. price);

holder. zong = convertView.findViewById(R.id. zong);

holder. sim = convertView.findViewById(R.id. sim);

holder. text_delete = convertView.findViewById(R.id. text_delete);

convertView.setTag(holder);

} else{

holder = (MyHolder) convertView.getTag();

}

//赋值或许二级列表的子条目的数据

final GoodsBean.DataBean.ListBean listBean = data.get(groupPosition).getList().get(childPosition);

holder. cb.setChecked(listBean.getSelected()== 0 ? false: true);

String[] split = listBean.getImages().split( " \\ |");

Uri uri = Uri. parse(split[ 0]);

holder. sim.setImageURI(uri);

holder. name.setText(listBean.getTitle());

holder. price.setText( "￥"+listBean.getPrice());

holder. zong.setText(listBean.getNum()+ "");

//二级子条目的多选框点击事件更新

//点击子条目的二级列表进行子条目所有全选 以及主页面的全选

holder. cb.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View view) {

Map<String, String> params= new HashMap<>();

params.put( "sellerid", String. valueOf( listBean.getSellerid()));

params.put( "pid", String. valueOf( listBean.getPid()));

params.put( "selected", String. valueOf( listBean.getSelected()== 0 ? 1 : 0));

params.put( "num", String. valueOf( listBean.getNum()));

ApiServers api = HttpUtils. getInstance( "http://120.27.23.105/product/").getApi();

api.update( 75,params).enqueue( new Callback<UpBean>() {

@Override

public void onResponse(Call<UpBean> call, Response<UpBean> response) {

if (response.isSuccessful()){

//调用网址 myPresenterView.setNet( "http://120.27.23.105/product/");

}

@Override

public void onFailure(Call<UpBean> call, Throwable t) { } }); } });

//加

holder. jia.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View view) {

Map<String, String> params= new HashMap<>();

params.put( "sellerid", String. valueOf( listBean.getSellerid()));

params.put( "pid", String. valueOf( listBean.getPid()));

params.put( "selected", String. valueOf( listBean.getSelected()));

params.put( "num", String. valueOf( listBean.getNum()+ 1));

ApiServers api = HttpUtils. getInstance( "http://120.27.23.105/product/").getApi();

api.update( 75,params).enqueue( new Callback<UpBean>() {

@Override

public void onResponse(Call<UpBean> call, Response<UpBean> response) {

if (response.isSuccessful()){

myPresenterView.setNet( "http://120.27.23.105/product/");

}

@Override

public void onFailure(Call<UpBean> call, Throwable t) { } }); } });

//减

holder. jian.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View view) {

//判断如果减到一就不能再减了

int num= listBean.getNum();

if (num== 1){

return;

}

Map<String, String> params= new HashMap<>();

params.put( "sellerid", String. valueOf( listBean.getSellerid()));

params.put( "pid", String. valueOf( listBean.getPid()));

params.put( "selected", String. valueOf( listBean.getSelected()));

params.put( "num", String. valueOf(num- 1));

ApiServers api = HttpUtils. getInstance( "http://120.27.23.105/product/").getApi();

api.update( 75,params).enqueue( new Callback<UpBean>() {

@Override

public void onResponse(Call<UpBean> call, Response<UpBean> response) {

if (response.isSuccessful()){

myPresenterView.setNet( "http://120.27.23.105/product/");

}

@Override

public void onFailure(Call<UpBean> call, Throwable t) { } }); } });

//删除

holder. text_delete.setOnClickListener( new View.OnClickListener() {

@Override

public void onClick(View view) {

String pid = String. valueOf( listBean.getPid());

ApiServers api = HttpUtils. getInstance( "http://120.27.23.105/product/").getApi();

api.del( "75",pid).enqueue( new Callback<DeleteBean>() {

@Override

public void onResponse(Call<DeleteBean> call, Response<DeleteBean> response) {

if (response.isSuccessful()){

myPresenterView.setNet( "http://120.27.23.105/product/");

}

@Override

public void onFailure(Call<DeleteBean> call, Throwable t) { } }); } });

return convertView;

}

//总价返回到主界面

public void sendPriceAndCount() {

//价格和数量

double price= 0; int count= 0; for ( int i= 0;i< data.size();i++){

List<GoodsBean.DataBean.ListBean> listBeans = data.get(i).getList();

for ( int j= 0;j<listBeans.size();j++){

if (listBeans.get(j).getSelected()== 1) {

//价格和数量相乘

price +=listBeans.get(j).getBargainPrice() * listBeans.get(j).getNum();

//数量

count +=listBeans.get(j).getNum();

}

//创建bean类把总价和数量传入

//到时候我们会返回到主界面进行handler赋值

DecimalFormat decimalFormat = new DecimalFormat( "0.00");

String priceString = decimalFormat.format(price);

CountPriceBean countPriceBean = new CountPriceBean(priceString, count);

Message msg=Message. obtain();

msg. what= 0; msg. obj=countPriceBean;

handler.sendMessage(msg);

}

@Override

public boolean isChildSelectable( int groupPosition, int childPosition) {

return false;

}

//主界面全选添加到集合里面返回到主界面

public void isAllCheckChild( boolean checked) {

List<GoodsBean.DataBean.ListBean> allList = new ArrayList<>();

for ( int i= 0;i< data.size();i++){

GoodsBean.DataBean dataBean = data.get(i);

for ( int j= 0;j<dataBean.getList().size();j++){

GoodsBean.DataBean.ListBean listBean = dataBean.getList().get(j);

allList.add(listBean);

}

allIndex = 0;

updateAllChildCheck(checked,allList);

}

//更新

private void updateAllChildCheck( final boolean checked, final List<GoodsBean.DataBean.ListBean> allList) {

final GoodsBean.DataBean.ListBean listBean = allList.get( allIndex);

Map<String,String> params = new HashMap<>();

//查询

params.put( "sellerid", String. valueOf(listBean.getSellerid()));

params.put( "pid", String. valueOf(listBean.getPid()));

params.put( "selected", String. valueOf(checked ? 1 : 0));

params.put( "num", String. valueOf(listBean.getNum()));

ApiServers api = HttpUtils. getInstance( "http://120.27.23.105/product/").getApi();

api.update( 75,params).enqueue( new Callback<UpBean>() {

@Override

public void onResponse(Call<UpBean> call, Response<UpBean> response) {

allIndex++;

if ( allIndex< allList.size()){ updateAllChildCheck( checked, allList);

} else{

myPresenterView.setNet( "http://120.27.23.105/product/");

}

@Override

public void onFailure(Call<UpBean> call, Throwable t) { } });

}

class MyHolder{

CheckBox cb;

TextView name;

TextView price;

TextView zong;

TextView jia, jian;

TextView text_delete;

SimpleDraweeView sim;

}

class GroupHolder{

CheckBox check; TextView title;

}