一级列表购物车

想要实现购物车功能首先导入一个RecycleView的依赖

MainActivity类

public class MainActivity extends AppCompatActivity {    private CheckBox checkBox;    private TextView all_price;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        checkBox = (CheckBox) findViewById(R.id.ck_all);        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.rv_car);        all_price = (TextView) findViewById(R.id.all_price);        LinearLayoutManager manager = new LinearLayoutManager(this);        recyclerView.setLayoutManager(manager);        //添加死数据        final List<CarBean> list = new ArrayList<>();        for (int i = 0; i < 5; i++) {            list.add(new CarBean(R.mipmap.ic_launcher_round, "商品" + i, 100, true, 1));        }        final CarAdapter adapter = new CarAdapter(this, list);        recyclerView.setAdapter(adapter);        adapter.setCheckListener(new CarAdapter.CheckListener() {            @Override            public void check(boolean check, int position) {                //监听全选                boolean all_check = true;                //价格                float price = 0;                int count = 0;                for (int i = 0; i < list.size(); i++) {                    if (list.get(i).isB()) {                        price += list.get(i).getPrice() * list.get(i).getCount();                        count += list.get(i).getCount();                    }                }                all_price.setText("共计" + count + "件，总共" + price + "元");                for (int i = 0; i < list.size(); i++) {                    if (!list.get(i).isB()) {                        all_check = false;                        break;                    }                }                if (all_check) {                    checkBox.setChecked(true);                } else {                    checkBox.setChecked(false);                }            }        });        //全选和反选        checkBox.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                boolean check = checkBox.isChecked();                float price = 0;                int count = 0;                for (int i = 0; i < list.size(); i++) {                    list.get(i).setB(check);                    if (list.get(i).isB()) {                        price += list.get(i).getPrice() * list.get(i).getCount();                        count += list.get(i).getCount();                    }                }                adapter.notifyDataSetChanged();                all_price.setText("共计" + count + "件，总共" + price + "元");            }        });    }}

Main布局

<?xml version="1.0" encoding="utf-8"?><LinearLayout 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"    android:orientation="vertical"    tools:context="com.example.gouwuche.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text="购物车"        android:textSize="28sp" />    <android.support.v7.widget.RecyclerView        android:id="@+id/rv_car"        android:layout_width="match_parent"        android:layout_height="0dp"        android:layout_weight="1" />    <LinearLayout        android:layout_width="match_parent"        android:layout_height="30dp"        android:orientation="horizontal">        <CheckBox            android:id="@+id/ck_all"            android:layout_width="0dp"            android:layout_height="wrap_content"            android:layout_gravity="center"            android:layout_weight="1"            android:checked="true"            android:text="全选" />        <TextView            android:id="@+id/all_price"            android:layout_width="0dp"            android:layout_height="match_parent"            android:layout_marginLeft="10dp"            android:layout_weight="1"            android:gravity="center_vertical"            android:text="总计5件，总价500元"            android:textSize="10sp" />    </LinearLayout></LinearLayout>

Adapter适配器

public class CarAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {    private Context context;    private List<CarBean> list;    public CarAdapter(Context context, List<CarBean> list) {        this.context = context;        this.list = list;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(context).inflate(R.layout.car_item,parent,false);        ViewHolder holder = new ViewHolder(view);        return holder;    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {        if(holder instanceof ViewHolder){            ViewHolder viewHolder = (ViewHolder)holder;            if(list.get(position).isB()){                viewHolder.item_ck.setChecked(true);            }else{                viewHolder.item_ck.setChecked(false);            }            viewHolder.item_name.setText(list.get(position).getName());            viewHolder.item_price.setText("单价："+list.get(position).getPrice()+" ¥");            viewHolder.item_des.setText("共计"+list.get(position).getCount()+"件，总价"+list.get(position).getCount()*100+"元");            viewHolder.item_ck.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    boolean isChecked = list.get(position).isB();                    list.get(position).setB(!isChecked);                    notifyDataSetChanged();                    if(listener != null){                        listener.check(!isChecked,position);                    }                }            });            //监听Edtext            viewHolder.item_custom.setListener(new CustomView.ChangeListener() {                @Override                public void onChange(long count) {                    list.get(position).setCount(count);                    notifyDataSetChanged();                    if(listener != null){                        listener.check(list.get(position).isB(),position);                    }                }            });            viewHolder.del.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    if (list.get(position).isB()){                        Toast.makeText(context, "不能删除", Toast.LENGTH_SHORT).show();                    }else {                        list.remove(position);                        notifyDataSetChanged();                        if(listener != null){                            listener.check(true,position);                        }                    }                }            });        }    }    @Override    public int getItemCount() {        return list.size();    }    //为check写一个接口    public CheckListener listener;    public void setCheckListener(CheckListener listener){        this.listener = listener;    }    public interface CheckListener{        public void check(boolean check, int position);    }    class ViewHolder extends RecyclerView.ViewHolder{        private final CustomView item_custom;        private final TextView item_name;        private final TextView item_price;        private final TextView item_des;        private final CheckBox item_ck;        private final Button del;        public ViewHolder(View itemView) {            super(itemView);            item_custom = (CustomView) itemView.findViewById(R.id.item_custom);            item_name = (TextView) itemView.findViewById(R.id.item_name);            item_ck = (CheckBox) itemView.findViewById(R.id.item_ck);            item_price = itemView.findViewById(R.id.item_price);            item_des = itemView.findViewById(R.id.item_des);            del = itemView.findViewById(R.id.delete);        }    }}

item布局

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="130dp">    <CheckBox        android:id="@+id/item_ck"        android:layout_centerVertical="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content" />    <ImageView        android:id="@+id/car_img"        android:layout_toRightOf="@id/item_ck"        android:src="@mipmap/ic_launcher"        android:layout_margin="5dp"        android:layout_width="60dp"        android:layout_centerVertical="true"        android:layout_height="60dp" />    <TextView        android:id="@+id/item_name"        android:layout_toRightOf="@id/car_img"        android:layout_width="wrap_content"        android:text="111"        android:layout_marginTop="30dp"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/item_price"        android:layout_toRightOf="@id/car_img"        android:layout_width="wrap_content"        android:text="111"        android:layout_below="@id/item_name"        android:layout_height="wrap_content" />    <com.example.gouwuche.CustomView        android:id="@+id/item_custom"        android:layout_below="@id/item_price"        android:layout_toRightOf="@id/car_img"        android:layout_width="70dp"        android:layout_height="70dp"/>    <Button        android:id="@+id/delete"        android:layout_alignParentRight="true"        android:layout_margin="5dp"        android:text="删除"        android:layout_centerVertical="true"        android:layout_width="40dp"        android:layout_height="wrap_content" />    <TextView        android:id="@+id/item_des"        android:layout_alignParentBottom="true"        android:layout_toRightOf="@id/car_img"        android:layout_width="wrap_content"        android:layout_height="wrap_content" /></RelativeLayout>

javaBean

public class CarBean {    private int pic;    private String name;    private int price;    private boolean b=true;    private long count;    public CarBean(int pic, String name, int price, boolean isSelect, long count) {        this.pic = pic;        this.name = name;        this.price = price;        this.b = isSelect;        this.count = count;    }    public int getPic() {        return pic;    }    public void setPic(int pic) {        this.pic = pic;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public int getPrice() {        return price;    }    public void setPrice(int price) {        this.price = price;    }    public boolean isB() {        return b;    }    public void setB(boolean b) {        this.b = b;    }    public long getCount() {        return count;    }    public void setCount(long count) {        this.count = count;    }}

自定义layout布局

public class CustomView extends LinearLayout{    public CustomView(Context context) {        super(context);    }    public CustomView(final Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        View view = LayoutInflater.from(context).inflate(R.layout.custom_layout,null);        addView(view);        Button jian = (Button) view.findViewById(R.id.jian);        Button jia = (Button) view.findViewById(R.id.jia);        final EditText num = (EditText) view.findViewById(R.id.num);        //减号        jian.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                String result = num.getText().toString().trim();                int integerResult = Integer.valueOf(result);                    //给做个限制                    if(integerResult > 1){                    integerResult = integerResult - 1;                    num.setText(integerResult + "");                }else{                    Toast.makeText(context, "最小数量为1", Toast.LENGTH_SHORT).show();                }                if(listener != null){                    listener.onChange(integerResult);                }            }        });        //加号        jia.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                String result = num.getText().toString().trim();                int integerResult = Integer.valueOf(result);                if(integerResult < 10000){                    integerResult = integerResult + 1;                    num.setText(integerResult +"");                }else{                    Toast.makeText(context, "已经超出最大值", Toast.LENGTH_SHORT).show();                }                if(listener != null ){                    listener.onChange(integerResult);                }            }        });        num.addTextChangedListener(new TextWatcher() {            @Override            public void beforeTextChanged(CharSequence s, int start, int count, int after) {                Log.i("beforeTextChanged",s+"-----"+start+"-------"+count+"-----"+after);            }            @Override            public void onTextChanged(CharSequence s, int start, int before, int count) {                Log.i("onTextChanged",s+"-----"+start+"-------"+before+"-----"+count);            }            @Override            public void afterTextChanged(Editable s) {                if(listener != null ){                    listener.onChange(Long.valueOf(s.toString()));                }            }        });    }    public CustomView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public ChangeListener listener;    public void setListener(ChangeListener listener){        this.listener = listener;    }    public interface ChangeListener{        public void onChange(long count);    }}

布局效果

<?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">    <Button        android:layout_width="30dp"        android:layout_height="30dp"        android:text="-"        android:background="#fff"        android:id="@+id/jian"        />    <EditText        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:inputType="number"        android:text="1"        android:id="@+id/num"/>    <Button        android:layout_width="30dp"        android:layout_height="30dp"        android:background="#fff"        android:text="+"        android:id="@+id/jia"/></LinearLayout>