Java 如何更改RecyclerView中每个项目的值
我有一个Java 如何更改RecyclerView中每个项目的值,java,android,android-recyclerview,Java,Android,Android Recyclerview,我有一个RecyclerView,它有两个项目。我希望能够分别更改每个项目中TextView的值 例如: Tomato Soup Chicken Lamb Chicken Soup Fruit Carrot 目前,每个项目都有相同的值 (我正在使用OkHttp和一些JSON解析从位于的网页中获取值) MainActivity.java package me.anshsehgal.foodplanner; import android.support.v7.app.
RecyclerView
,它有两个项目。我希望能够分别更改每个项目中TextView
的值
例如:
Tomato Soup Chicken Lamb
Chicken Soup Fruit Carrot
目前,每个项目都有相同的值
(我正在使用OkHttp
和一些JSON
解析从位于的网页中获取值)
MainActivity.java
package me.anshsehgal.foodplanner;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
ArrayList<Menu> menus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView menuRecyclerView = (RecyclerView) findViewById(R.id.menuRecyclerView);
// Initialize contacts
menus = Menu.createContactsList(2);
// Create adapter passing in the sample user data
DaysAdapter adapter = new DaysAdapter(this, menus);
// Attach the adapter to the recyclerview to populate items
menuRecyclerView.setAdapter(adapter);
// Set layout manager to position the items
menuRecyclerView.setLayoutManager(new LinearLayoutManager(this));
// That's all!
}
}
package me.anshsehgal.foodplan;
导入android.support.v7.app.AppActivity;
导入android.os.Bundle;
导入android.support.v7.widget.LinearLayoutManager;
导入android.support.v7.widget.RecyclerView;
导入java.util.ArrayList;
公共类MainActivity扩展了AppCompatActivity{
ArrayList菜单;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView menuRecyclerView=(RecyclerView)findViewById(R.id.menuRecyclerView);
//初始化联系人
菜单=菜单。创建联系人列表(2);
//创建传入示例用户数据的适配器
DaysAdapter adapter=新的DaysAdapter(这是菜单);
//将适配器连接到recyclerview以填充项目
menuRecyclerView.setAdapter(适配器);
//设置布局管理器以定位项目
menuRecyclerView.setLayoutManager(新的LinearLayoutManager(this));
//就这些!
}
}
java(我的recyclerview适配器)
导入android.content.Context;
导入android.support.v7.widget.RecyclerView;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.TextView;
导入java.io.IOException;
导入java.util.List;
导入java.util.concurrent.ExecutionException;
公共类DaysAdapter扩展
RecyclerView.适配器{
公共静态类ViewHolder扩展了RecyclerView.ViewHolder{
公共文本视图日菜单;
公共文本视图源菜单;
公共文本查看主菜单;
公共视图持有者(视图项视图){
超级(项目视图);
daysMenu=(TextView)itemView.findViewById(R.id.dayMenu);
soupmenus=(TextView)itemView.findViewById(R.id.soupmenus);
NonVegMain菜单=(TextView)itemView.findViewById(R.id.NonVegMain菜单);
}
}
//存储联系人的成员变量
私人物品清单;
//存储上下文以便于访问
私有上下文;
//将联系人数组传入构造函数
public DaysAdapter(上下文、列表菜单){
mMenuItems=菜单;
mContext=上下文;
}
//轻松访问recyclerview中的上下文对象
私有上下文getContext(){
返回mContext;
}
@凌驾
public DaysAdapter.ViewHolder onCreateViewHolder(视图组父级,int-viewType){
Context=parent.getContext();
LayoutFlater充气机=LayoutFlater.from(上下文);
//对自定义布局进行充气
视图菜单项视图=充气机。充气(R.layout.days,父项,false);
//返回一个新的holder实例
ViewHolder ViewHolder=新的ViewHolder(菜单项视图);
返回视图持有者;
}
@凌驾
BindViewHolder上的公共无效(DaysAdapter.ViewHolder-ViewHolder,int位置){
菜单菜单项=mMenuItems.get(位置);
Menu.OkHttpHandler=新建Menu.OkHttpHandler();
text查看日期text=viewHolder.daysMenu;
试一试{
//在此处更改值
字符串结果=处理程序。执行(“http://asehgal17.netau.net/json_get_data.php).get();
setText(handler.getJsonDay());
text视图soupText=viewHolder.soupMenu;
setText(handler.getJsonSoup());
text查看非EGmain text=viewHolder.nonEGmain菜单;
setText(handler.getJsonNonVegMain());
}捕获(执行例外){
e、 printStackTrace();
}捕捉(中断异常e){
e、 printStackTrace();
}
}
@凌驾
public int getItemCount(){
返回mMenuItems.size();
}
}
java(存储数据的类)
导入android.os.AsyncTask;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入java.io.IOException;
导入java.util.ArrayList;
导入okhttp3.OkHttpClient;
导入okhttp3.请求;
导入okhttp3.响应;
公共类菜单{
私人int mId;
私有字符串mDay;
私有字符串mSoup;
私有字符串mNonVegMain;
私有字符串在服务器端;
私有字符串mVegMain;
私有字符串mVegSide;
公共菜单(int-id、String-day、String-soup、String-nonegmain、String-nonegside、String-vegMain、String-vegSide){
mId=id;
mDay=天;
mSoup=汤;
mNonVegMain=非EGMAIN;
mNonVegSide=非egside;
mVegMain=vegMain;
mVegSide=vegSide;
}
公共字符串getmDay(){
返回mDay;
}
公共int getmId(){
中途返回;
}
公共字符串getmNonVegMain(){
返回mNonVegMain;
}
公共字符串getmNonVegSide(){
返回到素食区;
}
公共字符串getmSoup(){
返回mSoup;
}
公共字符串getmVegMain(){
返回mVegMain;
}
公共字符串getmVegSide(){
返回mVegSide;
}
//在此类中获取JSON响应
公共静态类OkHttpHandler扩展了AsyncTask{
字符串jsonDay;
字符串jsonSoup;
字符串JSONNOVEGMAIN;
字符串jsonNonVegSide;
字符串jsonVegMain;
字符串jsonVegSide;
OkHttpClient=新的OkHttpClient();
@凌驾
受保护的字符串doInBackground(字符串…参数){
Request.Builder=新建Request.Builder();
builder.url(参数[0]);
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.ExecutionException;
public class DaysAdapter extends
RecyclerView.Adapter<DaysAdapter.ViewHolder> {
public static class ViewHolder extends RecyclerView.ViewHolder{
public TextView daysMenu;
public TextView soupMenu;
public TextView nonVegMainMenu;
public ViewHolder(View itemView){
super(itemView);
daysMenu = (TextView)itemView.findViewById(R.id.dayMenu);
soupMenu = (TextView)itemView.findViewById(R.id.soupMenu);
nonVegMainMenu = (TextView)itemView.findViewById(R.id.nonVegMainMenu);
}
}
// Store a member variable for the contacts
private List<Menu> mMenuItems;
// Store the context for easy access
private Context mContext;
// Pass in the contact array into the constructor
public DaysAdapter(Context context, List<Menu> menus) {
mMenuItems = menus;
mContext = context;
}
// Easy access to the context object in the recyclerview
private Context getContext() {
return mContext;
}
@Override
public DaysAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
// Inflate the custom layout
View menutItemView = inflater.inflate(R.layout.days, parent, false);
// Return a new holder instance
ViewHolder viewHolder = new ViewHolder(menutItemView);
return viewHolder;
}
@Override
public void onBindViewHolder(DaysAdapter.ViewHolder viewHolder, int position) {
Menu menuItem = mMenuItems.get(position);
Menu.OkHttpHandler handler = new Menu.OkHttpHandler();
TextView dayText = viewHolder.daysMenu;
try{
//changing value here
String result = handler.execute("http://asehgal17.netau.net/json_get_data.php").get();
dayText.setText(handler.getJsonDay());
TextView soupText = viewHolder.soupMenu;
soupText.setText(handler.getJsonSoup());
TextView nonVegMainText = viewHolder.nonVegMainMenu;
nonVegMainText.setText(handler.getJsonNonVegMain());
}catch (ExecutionException e){
e.printStackTrace();
}catch (InterruptedException e){
e.printStackTrace();
}
}
@Override
public int getItemCount() {
return mMenuItems.size();
}
}
import android.os.AsyncTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.IOException;
import java.util.ArrayList;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
public class Menu {
private int mId;
private String mDay;
private String mSoup;
private String mNonVegMain;
private String mNonVegSide;
private String mVegMain;
private String mVegSide;
public Menu(int id, String day, String soup, String nonVegMain, String nonVegSide, String vegMain, String vegSide) {
mId = id;
mDay = day;
mSoup = soup;
mNonVegMain = nonVegMain;
mNonVegSide = nonVegSide;
mVegMain = vegMain;
mVegSide = vegSide;
}
public String getmDay() {
return mDay;
}
public int getmId() {
return mId;
}
public String getmNonVegMain() {
return mNonVegMain;
}
public String getmNonVegSide() {
return mNonVegSide;
}
public String getmSoup() {
return mSoup;
}
public String getmVegMain() {
return mVegMain;
}
public String getmVegSide() {
return mVegSide;
}
//getting JSON response in this class
public static class OkHttpHandler extends AsyncTask<String, Void, String> {
String jsonDay;
String jsonSoup;
String jsonNonVegMain;
String jsonNonVegSide;
String jsonVegMain;
String jsonVegSide;
OkHttpClient client = new OkHttpClient();
@Override
protected String doInBackground(String... params) {
Request.Builder builder = new Request.Builder();
builder.url(params[0]);
Request request = builder.build();
try {
Response response = client.newCall(request).execute();
String jsonString = response.body().string() ;
//parsing JSON
JSONObject json = new JSONObject(jsonString);
JSONArray parentArray = json.getJSONArray("server_response");
JSONObject mondayMenu = parentArray.getJSONObject(1);
String day = mondayMenu.getString("day");
String soup = mondayMenu.getString("soup");
String nonVegMain = mondayMenu.getString("non_veg_main");
String nonVegSide = mondayMenu.getString("non_veg_side");
String vegMain = mondayMenu.getString("veg_main");
String vegSide = mondayMenu.getString("veg_side");
jsonDay = day;
jsonSoup = soup;
jsonNonVegMain = nonVegMain;
jsonNonVegSide = nonVegSide;
jsonVegMain = vegMain;
jsonVegSide = vegSide;
} catch (IOException e) {
e.printStackTrace();
}catch (JSONException e){
e.printStackTrace();
}
return null;
}
public String getJsonDay() {
return jsonDay;
}
public String getJsonNonVegMain() {
return jsonNonVegMain;
}
public String getJsonNonVegSide() {
return jsonNonVegSide;
}
public String getJsonSoup() {
return jsonSoup;
}
public String getJsonVegMain() {
return jsonVegMain;
}
public String getJsonVegSide() {
return jsonVegSide;
}
}
public static ArrayList<Menu> createContactsList(int numContacts) {
OkHttpHandler handler = new OkHttpHandler();
ArrayList<Menu> menuItems = new ArrayList<Menu>();
menuItems.add(new Menu(numContacts,handler.jsonDay,handler.jsonSoup,handler.jsonNonVegMain,handler.jsonNonVegSide,handler.jsonVegMain,handler.jsonVegSide));
menuItems.add(new Menu(2,"fff","fff","e","e","3r","3rrr"));
return menuItems;
}
}
menus = Menu.createContactsList(2);
public void onBindViewHolder(DaysAdapter.ViewHolder viewHolder, int position) {
Menu menuItem = mMenuItems.get(position);
viewHolder.daysMenu.setText(menuItem.mDay);
viewHolder.soupMenu.setText(menuItem.mSoup);
viewHolder.nonVegMainMenu.setText(menuItem.mNonVegMain);
}