如何在片段Android Recyclerview截图中显示JSON数据?
请帮助解决以下问题,问题是数据不希望出现在如何在片段Android Recyclerview截图中显示JSON数据?,android,android-fragments,android-recyclerview,android-volley,Android,Android Fragments,Android Recyclerview,Android Volley,请帮助解决以下问题,问题是数据不希望出现在片段主页中,即使internet条件已打开 我的家庭片段代码: package untag.adproj.lestari.lestari.Home; import android.content.Context; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.widge
片段
主页中,即使internet条件已打开
我的家庭片段代码:
package untag.adproj.lestari.lestari.Home;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import untag.adproj.lestari.lestari.R;
public class HomeFragment extends Fragment {
private String URL="http://pembuatanprogram.000webhostapp.com";
private RecyclerAdapter recyclerAdapter;
private RecyclerView recyclerView;
private ArrayList<Data> listdata;
private GridLayoutManager gridLayoutManager;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
public HomeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
gridLayoutManager = new GridLayoutManager(getActivity(), 2);
gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(gridLayoutManager);
listdata = new ArrayList<Data>();
AmbilData();
recyclerAdapter = new RecyclerAdapter(getActivity(),listdata);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter.notifyDataSetChanged();
return view;
}
private void AmbilData() {
JsonArrayRequest aarRequest = new JsonArrayRequest(URL + "/produk.php" ,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
if (response.length()>0){
for (int i =0 ; i<response.length();i++){
try {
JSONObject data = response.getJSONObject(i);
Data item = new Data();
item.setId(data.getString("id"));
item.setJudul(data.getString("judul"));
item.setHarga(data.getString("harga"));
item.setThubnail(data.getString(URL+"/img/"+data.getString("gambar")));
listdata.add(item);
recyclerAdapter.notifyDataSetChanged();
} catch (JSONException e) {
}
}
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}){
};
Volley.newRequestQueue(getActivity()).add(aarRequest);
}
}
package untag.adproj.lestari.lestari.Home;
import android.app.Activity;
import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
import untag.adproj.lestari.lestari.R;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private ArrayList<Data> listdata;
private Activity activity;
private Context context;
public RecyclerAdapter(Activity activity, ArrayList<Data> listdata) {
this.listdata = listdata;
this.activity = activity;
}
@Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.fragment_home_list, parent, false);
ViewHolder vh = new ViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
//holder.mImage.setImageResource(listdata.get(position).getThubnail());
holder.id.setText(listdata.get(position).getId());
holder.judul.setText(listdata.get(position).getJudul());
holder.harga.setText(listdata.get(position).getHarga());
final ViewHolder x=holder;
Glide.with(activity)
.load(listdata.get(position).getThubnail())
.into(holder.thumbnail);
holder.id.setVisibility(View.GONE);
}
@Override
public int getItemCount() {
return listdata.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
private CardView cv;
private TextView id,judul,harga;
private ImageView thumbnail;
public ViewHolder(View v) {
super(v);
cv=(CardView)v.findViewById(R.id.card_view);
id=(TextView)v.findViewById(R.id.id);
judul=(TextView)v.findViewById(R.id.judul);
harga=(TextView)v.findViewById(R.id.harga);
thumbnail=(ImageView)v.findViewById(R.id.thumbnail);
}
}
}
package untag.adproj.lestari.lestari.Home;
public class Data {
private String id;
private String judul;
private String harga;
private String thubnail;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getJudul() {
return judul;
}
public void setJudul(String judul) {
this.judul = judul;
}
public String getHarga() {
return harga;
}
public void setHarga(String harga) {
this.harga = harga;
}
public String getThubnail() {
return thubnail;
}
public void setThubnail(String thubnail) {
this.thubnail = thubnail;
}
}
我的代码刷新来自
但是在教程中它没有使用fragment,请任何人帮助我你有一个错误的观点,那就是没有更新
回收器视图的列表
,你在codelistdata.add(item)中添加值的列表代码>属于您的片段
请在适配器中添加以下方法
public void addData(List<Data> data) {
listdata.addAll(data);
notifyDataSetChanged();
}
您有一个错误的观点,那就是不更新回收器视图的列表,即您在codelistdata.add(item)中添加值的列表代码>属于您的片段
请在适配器中添加以下方法
public void addData(List<Data> data) {
listdata.addAll(data);
notifyDataSetChanged();
}
包untag.adproj.lestari.lestari.Home;
导入android.content.Context;
导入android.net.Uri;
导入android.os.Bundle;
导入android.support.v4.app.Fragment;
导入android.support.v7.widget.GridLayoutManager;
导入android.support.v7.widget.RecyclerView;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入com.android.volley.Response;
导入com.android.volley.VolleyError;
导入com.android.volley.toolbox.JsonArrayRequest;
导入com.android.volley.toolbox.volley;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入java.util.ArrayList;
进口untag.adproj.lestari.lestari.R;
公共类HomeFragment扩展了片段{
专用字符串URL=”http://pembuatanprogram.000webhostapp.com";
私人回收器适配器回收器适配器;
私人回收站;
私有数组列表数据;
私人阿雷利斯特圣殿骑士;
专用GridLayoutManager GridLayoutManager;
//TODO:重命名参数参数,选择匹配的名称
//片段初始化参数,例如ARG_ITEM_NUMBER
公共HomeFragment(){
//必需的空公共构造函数
}
@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
视图=充气机。充气(R.layout.fragment\u home,container,false);
recyclerView=view.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
gridLayoutManager=新的gridLayoutManager(getActivity(),2);
setOrientation(gridLayoutManager.VERTICAL);
setLayoutManager(gridLayoutManager);
templast=newarraylist();
listdata=newarraylist();
AmbilData();
recyclerAdapter=新的recyclerAdapter(getActivity(),listdata);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter.notifyDataSetChanged();
返回视图;
}
私有void AmbilData(){
JsonArrayRequest aarRequest=新的JsonArrayRequest(URL+“/produk.php”,
新的Response.Listener(){
@凌驾
公共void onResponse(JSONArray响应){
if(response.length()>0){
对于(int i=0;i包untag.adproj.lestari.lestari.Home;
导入android.content.Context;
导入android.net.Uri;
导入android.os.Bundle;
导入android.support.v4.app.Fragment;
导入android.support.v7.widget.GridLayoutManager;
导入android.support.v7.widget.RecyclerView;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入com.android.volley.Response;
导入com.android.volley.VolleyError;
导入com.android.volley.toolbox.JsonArrayRequest;
导入com.android.volley.toolbox.volley;
导入org.json.JSONArray;
导入org.json.JSONException;
导入org.json.JSONObject;
导入java.util.ArrayList;
进口untag.adproj.lestari.lestari.R;
公共类HomeFragment扩展了片段{
专用字符串URL=”http://pembuatanprogram.000webhostapp.com";
私人回收器适配器回收器适配器;
私人回收站;
私有数组列表数据;
私人阿雷利斯特圣殿骑士;
专用GridLayoutManager GridLayoutManager;
//TODO:重命名参数参数,选择匹配的名称
//片段初始化参数,例如ARG_ITEM_NUMBER
公共HomeFragment(){
//必需的空公共构造函数
}
@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
视图=充气机。充气(R.layout.fragment\u home,container,false);
recyclerView=view.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
gridLayoutManager=新的gridLayoutManager(getActivity(),2);
setOrientation(gridLayoutManager.VERTICAL);
setLayoutManager(gridLayoutManager);
templast=newarraylist();
listdata=newarraylist();
AmbilData();
recyclerAdapter=新的recyclerAdapter(getActivity(),listdata);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter.notifyDataSetChanged();
返回视图;
}
私有void AmbilData(){
JsonArrayRequest aarRequest=新的JsonArrayRequest(URL+“/produk.php”,
新的Response.Listener(){
@爱
package untag.adproj.lestari.lestari.Home;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import untag.adproj.lestari.lestari.R;
public class HomeFragment extends Fragment {
private String URL="http://pembuatanprogram.000webhostapp.com";
private RecyclerAdapter recyclerAdapter;
private RecyclerView recyclerView;
private ArrayList<Data> listdata;
private ArrayList<Data> tempList;
private GridLayoutManager gridLayoutManager;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
public HomeFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_home, container, false);
recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
gridLayoutManager = new GridLayoutManager(getActivity(), 2);
gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(gridLayoutManager);
tempList = new ArrayList<Data>();
listdata = new ArrayList<Data>();
AmbilData();
recyclerAdapter = new RecyclerAdapter(getActivity(),listdata);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter.notifyDataSetChanged();
return view;
}
private void AmbilData() {
JsonArrayRequest aarRequest = new JsonArrayRequest(URL + "/produk.php" ,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
if (response.length()>0){
for (int i =0 ; i<response.length();i++){
try {
JSONObject data = response.getJSONObject(i);
Data item = new Data();
item.setId(data.getString("id"));
item.setJudul(data.getString("judul"));
item.setHarga(data.getString("harga"));
item.setThubnail(data.getString(URL+"/img/"+data.getString("gambar")));
tempList.add(item);
recyclerAdapter.notifyDataSetChanged();
} catch (JSONException e) {
}
}
listdata.clear();
listdata.addAll(tempList);
recyclerAdapter.notifyDataSetChanged();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}){
};
Volley.newRequestQueue(getActivity()).add(aarRequest);
}
}
for (int i =0 ; i<response.length();i++){
try {
JSONObject data = response.getJSONObject(i);
Data item = new Data();
item.setId(data.getString("id"));
item.setJudul(data.getString("judul"));
item.setHarga(data.getString("harga"));
item.setThubnail(data.getString(URL+"/img/"+data.getString("gambar")));
listdata.add(item);
recyclerAdapter.notifyItemInserted(listdata.size()-1); //To update the recyclerview one by one from a loop.
} catch (JSONException e) {
}
}
// OR
for (int i =0 ; i<response.length();i++){
try {
JSONObject data = response.getJSONObject(i);
Data item = new Data();
item.setId(data.getString("id"));
item.setJudul(data.getString("judul"));
item.setHarga(data.getString("harga"));
item.setThubnail(data.getString(URL+"/img/"+data.getString("gambar")));
listdata.add(item);
} catch (JSONException e) {
}
}
recyclerAdapter.notifyDataSetChanged(); //To update the whole recyclerview in one shot