This article shares the specific code of Android Studio to implement a simple shopping cart for your reference. The specific content is as follows
MainActivity layout file
<LinearLayout xmlns:andro
xmlns:app="/apk/res-auto"
xmlns:tools="/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<LinearLayout
android:
android:layout_width="match_parent"
android:layout_height="48dp"
android:background="#E24146"
android:orientation="vertical" >
<TextView
android:
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:minHeight="48dp"
android:text="Shopping cart"
android:textColor="#ffffff"
android:textSize="17sp" />
</LinearLayout>
<ListView
android:
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:childIndicator="@null"
android:groupIndicator="@null" >
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2.5"
android:gravity="center_vertical"
android:orientation="horizontal" >
<CheckBox
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="10dp"
android:layout_marginRight="4dp"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
android:gravity="center"
android:minHeight="64dp"
android:paddingLeft="10dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:visibility="visible" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:text="total:"
android:textSize="16sp"
android:textStyle="bold" />
<TextView
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="￥0.00"
android:textSize="16sp"
android:textStyle="bold" />
</LinearLayout>
<TextView
android:
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:clickable="true"
android:background="#a29e9e"
android:gravity="center"
android:text="delete"
android:textColor="#FAFAFA" />
<TextView
android:
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#E24146"
android:clickable="true"
android:gravity="center"
android:text="Payment(0)"
android:textColor="#FAFAFA" />
</LinearLayout>
</LinearLayout>
Layout file for entry
<LinearLayout xmlns:andro
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#CCCCCC" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<CheckBox
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="10dp"
android:layout_marginRight="4dp"
android:checkMark="?android:attr/listChoiceIndicatorMultiple"
android:gravity="center"
android:minHeight="64dp"
android:minWidth="32dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:visibility="visible" />
<ImageView
android:
android:layout_width="85dp"
android:layout_height="85dp"
android:layout_marginBottom="15dp"
android:layout_marginTop="13dp"
android:scaleType="centerCrop"
android:src="@mipmap/ic_launcher"
/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_marginTop="10dp"
android:layout_marginLeft="13dp" >
<TextView
android:
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginTop="20dp"
android:ellipsize="end"
android:maxLines="2"
android:text="commodity"
android:textSize="14sp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="30dp"
android:orientation="horizontal" >
<TextView
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:singleLine="true"
android:textSize="14sp"
android:textStyle="bold"
android:text="price"/>
<TextView
android:
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="10dp"
android:layout_toRightOf="@+id/tv_goods_price"
android:singleLine="true"
android:textSize="10sp"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="15dp"
android:orientation="horizontal" >
<TextView
android:
android:layout_width="25dp"
android:layout_height="25dp"
android:gravity="center"
android:background="#ccc"
android:text="one"
android:textSize="12sp" />
<TextView
android:
android:layout_width="25dp"
android:layout_height="25dp"
android:gravity="center"
android:singleLine="true"
android:text="1"
android:textSize="12sp" />
<TextView
android:
android:layout_width="25dp"
android:layout_height="25dp"
android:gravity="center"
android:text="ten"
android:background="#ccc"
android:textSize="12sp" />
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
CartAdapter Adapter
public class CaetAdapter extends BaseAdapter {
private Context context;
private List<HashMap<String, String>> list;
private HashMap<String, Integer> pitchOnMap;
public HashMap<String, Integer> getPitchOnMap() {
return pitchOnMap;
}
public void setPitchOnMap(HashMap<String, Integer> pitchOnMap) {
= pitchOnMap;
}
public CaetAdapter(Context context, List<HashMap<String, String>> list) {
= context;
= list;
pitchOnMap = new HashMap<>();
for (int i = 0; i < (); i++) {
((i).get("id"), 0);
}
}
@Override
public int getCount() {
return ();
}
@Override
public Object getItem(int position) {
return (position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
convertView = (context, .item_layout, null);
final CheckBox checkBox;
ImageView icon;
final TextView name, price, num, type, reduce, add;
checkBox = (.check_box);
icon = (.iv_adapter_list_pic);
name = (.tv_goods_name);
price = (.tv_goods_price);
type = (.tv_type_size);
num = (.tv_num);
reduce = (.tv_reduce);
add = (.tv_add);
((position).get("name"));
("¥ " + (((position).get("price"))) * (((position).get("count"))));
((position).get("type"));
((position).get("count"));
if(((position).get("id"))== 0){
(false);
}else{
(true);
}
(new () {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if(()){
((position).get("id"),1);
}else{
((position).get("id"), 0);
}
(pitchOnMap);
}
});
//The quantity of goods is reduced (new () {
@Override
public void onClick(View v) {
if (((position).get("count")) <= 1) {
(context, "The quantity cannot be reduced, it can only be deleted!", Toast.LENGTH_SHORT).show();
} else {
(position).put("count", (((position).get("count")) - 1) + "");
notifyDataSetChanged();
}
(pitchOnMap);
}
});
//Add quantity of goods (new () {
@Override
public void onClick(View v) {
(position).put("count", (((position).get("count")) + 1) + "");
notifyDataSetChanged();
(pitchOnMap);
}
});
return convertView;
}
/**
* Create an interface
*/
public interface RefreshPriceInterface {
/**
* Show the price to the total price
* @param pitchOnMap
*/
void refreshPrice(HashMap<String, Integer> pitchOnMap);
}
/**
* Define an interface object
*/
private RefreshPriceInterface mrefreshPriceInterface;
/**
* Expose a method to the outside
* Show the price to the total price
* @param refreshPriceInterface
*/
public void setRefreshPriceInterface(RefreshPriceInterface refreshPriceInterface) {
mrefreshPriceInterface = refreshPriceInterface;
}
}
MainActivity
public class MainActivity extends AppCompatActivity implements ,{
private LinearLayout top_bar;
private ListView listview;
private CheckBox all_chekbox;
private TextView price;
private TextView delete;
private TextView tv_go_to_pay;
private List<User> goodsList;
private UserDao userDao;
private List<HashMap<String,String>> listmap=new ArrayList<>();
private CaetAdapter adapter;
private double totalPrice = 0.00;
private int totalCount = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
(savedInstanceState);
setContentView(.activity_main);
initView();
}
private void initView() {
top_bar = (LinearLayout) findViewById(.top_bar);
listview = (ListView) findViewById();
all_chekbox = (CheckBox) findViewById(.all_chekbox);
price = (TextView) findViewById(.tv_total_price);
delete = (TextView) findViewById(.tv_delete);
tv_go_to_pay = (TextView) findViewById(.tv_go_to_pay);
all_chekbox.setOnClickListener(this);
(this);
tv_go_to_pay.setOnClickListener(this);
initDate();
adapter = new CaetAdapter(, listmap);
(adapter);
(this);
}
@Override
public void onClick(View v) {
switch (()) {
case .all_chekbox:
AllTheSelected();
break;
case .tv_delete:
checkDelete(());
break;
case .tv_go_to_pay:
if(totalCount<=0){
(this,"Please select the item to be paid for~",Toast.LENGTH_SHORT).show();
}else{
(this,"Payment successful",Toast.LENGTH_SHORT).show();
}
break;
}
}
/**
* data
*/
private void initDate() {
//Create a collection goodsList = new ArrayList<>();
//database userDao = ().getDaoSession().getUserDao();
();
//Data source for (int i = 0; i < 10; i++) {
//Storing data to the database User user = new User((long) i,
"The No. 1 in the Shopping Cart" + (i + 1) + "Product",
(i + 20) + "code",
"10",
"10");
(user);
}
//Put data from the database into the collection goodsList=();
//Put the combined data into the HashMap collection for(int i=0;i<();i++){
HashMap<String,String> map=new HashMap<>();
("id",(i).getId()+"");
("name",(i).getName());
("type",((i).getType()));
("price",(i).getPrice()+"");
("count",(i).getCount()+"");
(map);
}
}
@Override
public void refreshPrice(HashMap<String, Integer> pitchOnMap) {
priceControl(pitchOnMap);
}
/**
* Control price display total price
*/
private void priceControl(Map<String, Integer> pitchOnMap){
totalCount = 0;
totalPrice = 0.00;
for(int i=0;i<();i++){
if(((i).get("id"))==1){
totalCount=totalCount+((i).get("count"));
double goodsPrice=((i).get("count"))*((i).get("price"));
totalPrice=totalPrice+goodsPrice;
}
}
(" ¥ "+totalPrice);
tv_go_to_pay.setText("Payment("+totalCount+")");
}
/**
* Delete Control the total price of the price
* @param map
*/
private void checkDelete(Map<String,Integer> map){
List<HashMap<String,String>> waitDeleteList=new ArrayList<>();
Map<String,Integer> waitDeleteMap =new HashMap<>();
for(int i=0;i<();i++){
if(((i).get("id"))==1){
((i));
((i).get("id"),((i).get("id")));
}
}
(waitDeleteList);
(waitDeleteMap);
priceControl(map);
();
}
/**
*Select all or reverse
*/
private void AllTheSelected(){
HashMap<String,Integer> map=();
boolean isCheck=false;
boolean isUnCheck=false;
Iterator iter = ().iterator();
while (()) {
entry = () ();
if((().toString())==1){
isCheck=true;
}else{
isUnCheck=true;
}
}
if(isCheck==true&&isUnCheck==false){//I have selected all, do reverse selection for(int i=0;i<();i++){
((i).get("id"),0);
}
all_chekbox.setChecked(false);
}else if(isCheck==true && isUnCheck==true){//Selection of some, make all for(int i=0;i<();i++){
((i).get("id"),1);
}
all_chekbox.setChecked(true);
}else if(isCheck==false && isUnCheck==true){//No one is selected, choose all for(int i=0;i<();i++){
((i).get("id"),1);
}
all_chekbox.setChecked(true);
}
priceControl(map);
(map);
();
}
}
The above is all the content of this article. I hope it will be helpful to everyone's study and I hope everyone will support me more.