Java 单击列表项后如何保存步骤
首先很抱歉,如果标题不适合我的情况,首先我有一个片段中的列表视图,其中有一个适配器类组件。我的列表是这样的,如果我点击菜单项,它会增加每次点击的数量,显示在小橙色框中,我的问题是,当我滚动此列表或甚至更改活动时,它不会保存我这样做的单击,数量会返回到0,我只需要将此单击操作保存为 这是我的适配器类Java 单击列表项后如何保存步骤,java,android,Java,Android,首先很抱歉,如果标题不适合我的情况,首先我有一个片段中的列表视图,其中有一个适配器类组件。我的列表是这样的,如果我点击菜单项,它会增加每次点击的数量,显示在小橙色框中,我的问题是,当我滚动此列表或甚至更改活动时,它不会保存我这样做的单击,数量会返回到0,我只需要将此单击操作保存为 这是我的适配器类 package abtech.waiteriano.com.waitrer.adapters; import android.content.Context; import android.view
package abtech.waiteriano.com.waitrer.adapters;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
import java.util.ArrayList;
import abtech.waiteriano.com.waitrer.R;
import abtech.waiteriano.com.waitrer.fragments.LVMenuFragment;
/**
* Created by dell on 3/7/2017.
*/
public class CustomMenuLVAdapter extends BaseAdapter {
ArrayList<String> resultMenuItems;
LVItemHolder lvItemHolder;
Context context;
private static LayoutInflater inflater = null;
public CustomMenuLVAdapter(LVMenuFragment lvMenuFragment, ArrayList<String> listMenuArray) {
resultMenuItems = listMenuArray;
context = lvMenuFragment.getActivity();
inflater = (LayoutInflater) context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return resultMenuItems.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public class LVItemHolder {
TextView listMenuTV, txtQTY;
RelativeLayout qtyView;
Button minusBtn;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final LVItemHolder lvItemHolder = new LVItemHolder();
View rowView;
rowView = inflater.inflate(R.layout.menu_list_item, null);
lvItemHolder.listMenuTV = (TextView) rowView.findViewById(R.id.menulistTV2);
lvItemHolder.txtQTY = (TextView) rowView.findViewById(R.id.txtQTY);
lvItemHolder.minusBtn = (Button) rowView.findViewById(R.id.minusBtn);
lvItemHolder.listMenuTV.setText(resultMenuItems.get(position));
lvItemHolder.txtQTY.setText("0");
rowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int q = 0;
q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
q++;
lvItemHolder.txtQTY.setText("" + q);
// Toast.makeText(context, "You Clicked "+resultMenuItems.get(position), Toast.LENGTH_LONG).show();
}
});
lvItemHolder.minusBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int q = 0;
q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
if (q > 0)
q--;
lvItemHolder.txtQTY.setText("" + q);
}
});
return rowView;
}
}
包abtech.waiteriano.com.waiter.adapters;
导入android.content.Context;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.BaseAdapter;
导入android.widget.Button;
导入android.widget.RelativeLayout;
导入android.widget.TextView;
导入java.util.ArrayList;
进口abtech.waiteriano.com.waiter.R;
导入abtech.waiteriano.com.waiter.fragments.LVMenuFragment;
/**
*由戴尔于2017年3月7日创建。
*/
公共类CustomMenuLVAdapter扩展BaseAdapter{
ArrayList结果菜单项;
LVItemHolder LVItemHolder;
语境;
专用静态充气机=空;
公共CustomMenuLVAdapter(LVMenuFragment LVMenuFragment,ArrayList listMenuArray){
resultMenuItems=listMenuArray;
context=lvMenuFragment.getActivity();
充气器=(充气器)上下文。
getSystemService(上下文布局\充气机\服务);
}
@凌驾
public int getCount(){
返回resultMenuItems.size();
}
@凌驾
公共对象getItem(int位置){
返回位置;
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
公共类物品持有人{
TextView listMenuTV,txtQTY;
相对性qtyView;
按钮号;
}
@凌驾
公共视图getView(最终整数位置、视图转换视图、视图组父视图){
最终LVItemHolder LVItemHolder=新的LVItemHolder();
视图行视图;
rowView=充气机。充气(R.layout.menu\u list\u项,空);
lvItemHolder.listMenuTV=(TextView)rowView.findViewById(R.id.MenuListV2);
lvItemHolder.txtQTY=(TextView)rowView.findViewById(R.id.txtQTY);
lvItemHolder.minusBtn=(按钮)rowView.findViewById(R.id.minusBtn);
lvItemHolder.listMenuTV.setText(resultMenuItems.get(position));
lvItemHolder.txtQTY.setText(“0”);
rowView.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
int q=0;
q=Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
q++;
lvItemHolder.txtQTY.setText(“+q”);
//Toast.makeText(上下文,“您单击了”+resultMenuItems.get(位置),Toast.LENGTH_LONG.show();
}
});
lvItemHolder.minusBtn.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
int q=0;
q=Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
如果(q>0)
q--;
lvItemHolder.txtQTY.setText(“+q”);
}
});
返回行视图;
}
}
这是我的活动
package abtech.waiteriano.com.waitrer.fragments;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import abtech.waiteriano.com.waitrer.MenuActivity;
import abtech.waiteriano.com.waitrer.R;
import abtech.waiteriano.com.waitrer.adapters.CustomMenuLVAdapter;
import abtech.waiteriano.com.waitrer.connection_class.ConnectionClass;
public class LVMenuFragment extends android.app.Fragment {
View rootView;
ListView menuListView;
public static ArrayList<String> listMenuArray = new ArrayList<String>();
public LVMenuFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootView = inflater.inflate(R.layout.fragment_lvmenu, container, false);
menuListView=(ListView) rootView.findViewById(R.id.listView);
listMenuArray.clear();
String menuListSTR = "";
if (MenuActivity.Prst_ID.trim() == "-1")
menuListSTR = "Select ID,Code,Name,Name2 From Presets Where Active = 1 And Rest_ID_Active = 1 AND OutLet_ID_Active = 1 ORDER BY Code";
else
menuListSTR = "select dbo.MenuItems.Item_ID, dbo.Items.Code, dbo.Items.Name, dbo.Items.Name2, dbo.Items.PrintOnChick, dbo.Items.Taxable, dbo.Items.NoServiceCharge, dbo.Items.PrintOnReport,Case { fn IFNULL ((SELECT Price_Value FROM dbo.ItemsPrices WHERE (PriceLVL_ID = 1) AND (Item_ID = dbo.Items.ID)), 0) } when 0 then dbo.Items.StaticPrice Else { fn IFNULL ((SELECT Price_Value FROM dbo.ItemsPrices WHERE (PriceLVL_ID = 1) AND (Item_ID = dbo.Items.ID)), dbo.Items.StaticPrice) } END AS Price From dbo.MenuItems LEFT OUTER JOIN dbo.Items ON dbo.MenuItems.Item_ID = dbo.Items.ID Where (dbo.MenuItems.Preset_ID = " + MenuActivity.Prst_ID + ") AND (dbo.MenuItems.Rest_ID_Active = " + ConnectionClass.Rest_ID + ") AND (dbo.MenuItems.OutLet_ID_Active = " + ConnectionClass.OutletID + ") AND (dbo.Items.Active = 1) ORDER BY dbo.MenuItems.SortNumber";
ResultSet rs = ConnectionClass.Ret_RS(menuListSTR);
try {
while (rs.next()) {
listMenuArray.add(rs.getString("Name"));
}
} catch (SQLException e) {
e.printStackTrace();
}
menuListView.setAdapter(new CustomMenuLVAdapter(this,listMenuArray));
return rootView;
}
}
package abtech.waiteriano.com.waiter.fragments;
导入android.os.Bundle;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ListView;
导入java.sql.ResultSet;
导入java.sql.SQLException;
导入java.util.ArrayList;
导入abtech.waiteriano.com.waiter.MenuActivity;
进口abtech.waiteriano.com.waiter.R;
导入abtech.waiteriano.com.waiter.adapters.CustomMenuLVAdapter;
导入abtech.waiteriano.com.waiter.connection_class.ConnectionClass;
公共类LVMenuFragment扩展了android.app.Fragment{
视图根视图;
ListView菜单视图;
公共静态ArrayList listMenuArray=新ArrayList();
公共LVMenuFragment(){
//必需的空公共构造函数
}
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
//为该碎片膨胀布局
rootView=充气机。充气(R.layout.fragment\u lvmenu,container,false);
menuListView=(ListView)rootView.findViewById(R.id.ListView);
listMenuArray.clear();
字符串menuListSTR=“”;
如果(MenuActivity.Prst_ID.trim()=“-1”)
menuListSTR=“从预设中选择ID、代码、名称2,其中Active=1,Rest\u ID\u Active=1,OutLet\u ID\u Active=1,按代码排序”;
其他的
menuListSTR=“select dbo.MenuItems.Items\u ID,dbo.Items.Code,dbo.Items.Name,dbo.Items.PrintOnChick,dbo.Items.taddable,dbo.Items.noservicechare,dbo.Items.PrintOnReport,大小写{fn IFNULL((从dbo.ItemsPrices中选择Price\u值,其中(pricelvll\u ID=1)和(Item\u ID=dbo.Items.ID=dbo.Items.ID)),0)}为0时,则为dbo.Items.Items.StaticPrice Else){fn IFNULL((从dbo.ItemsPrices中选择Price_值,其中(PriceLVL_ID=1)和(Item_ID=dbo.Items.ID)),dbo.Items.StaticPrice}结束为dbo.MenuItems左外连接dbo.MenuItems.Item_ID=dbo.Items.ID,其中(dbo.MenuItems.Preset_ID=“+MenuActivity.Prst_ID+”)和(dbo.MenuItems.Rest_ID=)+ConnectionClass.Rest_ID+”)和(dbo.MenuItems.OutLet_ID_Active=“+ConnectionClass.OutletID+”)以及(dbo.Items.Active=1)按dbo.MenuItems.SortNumber订购”;
结果集rs=连接类Ret_rs(menuListSTR);
试一试{
while(rs.next()){
添加(rs.getString(“名称”);
}
}捕获(SQLE异常){
E
public void setNumber(int number) {this.number = number}
resultMenuItems.get(position).setNumber(//you number inputed here//);
//Then call notifydatasetChanged on your adapter//
public class CustomMenuLVAdapter extends BaseAdapter {
ArrayList<String> resultMenuItems;
LVItemHolder lvItemHolder;
Context context;
private static LayoutInflater inflater = null;
HashMap<Integer, Integer> map = new HashMap<>;
public CustomMenuLVAdapter(LVMenuFragment lvMenuFragment, ArrayList<String> listMenuArray) {
resultMenuItems = listMenuArray;
context = lvMenuFragment.getActivity();
inflater = (LayoutInflater) context.
getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return resultMenuItems.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public class LVItemHolder {
TextView listMenuTV, txtQTY;
RelativeLayout qtyView;
Button minusBtn;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
final LVItemHolder lvItemHolder = new LVItemHolder();
View rowView;
rowView = inflater.inflate(R.layout.menu_list_item, null);
lvItemHolder.listMenuTV = (TextView) rowView.findViewById(R.id.menulistTV2);
lvItemHolder.txtQTY = (TextView) rowView.findViewById(R.id.txtQTY);
lvItemHolder.minusBtn = (Button) rowView.findViewById(R.id.minusBtn);
lvItemHolder.listMenuTV.setText(resultMenuItems.get(position));
if(map.containsKey(position)){
lvItemHolder.txtQTY.setText(""+map.get(position));
}else{
lvItemHolder.txtQTY.setText("0");
}
rowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int q = 0;
q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
q++;
lvItemHolder.txtQTY.setText("" + q);
map.put(position,q)
// Toast.makeText(context, "You Clicked "+resultMenuItems.get(position), Toast.LENGTH_LONG).show();
}
});
lvItemHolder.minusBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int q = 0;
q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
if (q > 0)
q--;
lvItemHolder.txtQTY.setText("" + q);
map.put(position,q)
}
});
return rowView;
}