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我有一个自定义ListView从JSON数据库中检索数据，但问题是列表视图只显示一个条目重复。 我该如何解决这个问题？在JSON中重复相同的数据ListView
这里是我的代码
package com.example.monsterking.blood;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
public class all_donors extends Fragment {
String myJSON;
private ProgressDialog pDialog;
private static final String TAG_RESULTS = "result";
private static final String TAG_NAME = "Name";
private static final String TAG_BLOOD = "Blood";
private static final String TAG_AREA = "Area";
private static final String TAG_MOBILE = "Mobile";
private static final String TAG_LASTDONATED = "LastDonated";
private static final String TAG_EMAIL = "Email";
private static final String TAG_GENDER = "Gender";
private static final String TAG_DISTRICT = "District";
Button call;
SwipeRefreshLayout mSwipeRefreshLayout;
JSONArray donors = null;
ArrayList<HashMap<String, String>> donorList;
HashMap<String, String> persons = new HashMap<String, String>();
ListView list;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View myFragmentView = inflater.inflate(R.layout.activity_all_donors, container, false);
list = (ListView) myFragmentView.findViewById(R.id.listViewAll);
donorList = new ArrayList<HashMap<String, String>>();
mSwipeRefreshLayout = (SwipeRefreshLayout) myFragmentView.findViewById(R.id.swifeRefresh);
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
getData();
}
});
return myFragmentView;
}
protected void showList() {
if (TAG_RESULTS != null) {
donorList.clear();
try {
JSONObject jsonObj = new JSONObject(myJSON);
donors = jsonObj.getJSONArray(TAG_RESULTS);
for (int i = 0; i < donors.length(); i++) {
JSONObject c = donors.getJSONObject(i);
String Name = c.getString(TAG_NAME);
String Blood = c.getString(TAG_BLOOD);
String Area = c.getString(TAG_AREA);
String Mobile = c.getString(TAG_MOBILE);
String LastDonated = c.getString(TAG_LASTDONATED);
String Email = c.getString(TAG_EMAIL);
String District = c.getString(TAG_DISTRICT);
String Gender = c.getString(TAG_GENDER);
persons.put(TAG_NAME, Name);
persons.put(TAG_BLOOD, Blood);
persons.put(TAG_AREA, Area);
persons.put(TAG_MOBILE, Mobile);
persons.put(TAG_LASTDONATED, LastDonated);
persons.put(TAG_EMAIL, Email);
persons.put(TAG_DISTRICT, District);
persons.put(TAG_GENDER, Gender);
donorList.add(persons);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
// stopping swipe refresh
mSwipeRefreshLayout.setRefreshing(false);
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
}
public void getData() {
class GetDataJSON extends AsyncTask<String, Void, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(all_donors.this.getActivity());
pDialog.setMessage("Loading. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... params) {
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("http://monsterking.hol.es/fetchAll.php");
// Depends on your web service
httppost.setHeader("Content-type", "application/json");
InputStream inputStream = null;
String result = null;
try {
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
// json is UTF-8 by default
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
result = sb.toString();
} catch (Exception e) {
// Oops
} finally {
try {
if (inputStream != null) inputStream.close();
} catch (Exception squish) {
}
}
return result;
}
@Override
protected void onPostExecute(String result) {
pDialog.dismiss();
myJSON = result;
showList();
mSwipeRefreshLayout.setRefreshing(false);
list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// Launching new Activity on selecting single List Item
Intent i = new Intent(getActivity().getApplicationContext(), donor_details.class);
// sending data to new activity
startActivity(i);
}
});
CustomAdapter cus = new CustomAdapter(all_donors.this.getActivity(), donorList);
list.setAdapter(cus);
}
}
GetDataJSON g = new GetDataJSON();
g.execute();
}
@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
getData();
} else {
// fragment is no longer visible
}
}
public class CustomAdapter extends BaseAdapter {
LayoutInflater mInlfater;
ArrayList<HashMap<String, String>> donorList ;
public CustomAdapter(Context context, ArrayList<HashMap<String, String>> donorList) {
mInlfater = LayoutInflater.from(context);
this.donorList = donorList;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return donorList.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder;
if (convertView == null) {
convertView = mInlfater.inflate(R.layout.donor_list, null);
holder = new ViewHolder();
holder.call = (Button) convertView.findViewById(R.id.listcall);
holder.name = (TextView)convertView.findViewById(R.id.name);
holder.blood = (TextView)convertView.findViewById(R.id.blood);
holder.area = (TextView)convertView.findViewById(R.id.area);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
HashMap<String,String> map = donorList.get(position);
holder.name.setText(map.get(TAG_NAME));
holder.blood.setText(map.get(TAG_BLOOD));
holder.area.setText(map.get(TAG_AREA));
holder.call.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(getActivity().getApplicationContext(), login.class);
startActivity(i);
}
});
return convertView;
}
private class ViewHolder {
Button call;
TextView name,blood,area;
}
}
}
这里是输出
作品:) 谢谢 @Bills –