在我的android项目中我使用自定义列表视图，其中从服务器检索所有值并显示在列表视图中。我在listview条目中有一个按钮和textview，现在我希望按钮的功能就像我点击它时将获取同一组的任何textview中的值并将其显示在警告框中。我检索了数据并成功显示但我无法破解如何使用该按钮获取列表的textview值..提前感谢您的任何帮助...我的代码发布在下面。
这是我的联系适配器类：
package com.example.sohan.doctor;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Sohan on 6/9/2016.
*/
public class ContactAdapter extends ArrayAdapter {
notification nt = new notification();
List list = new ArrayList();
View row;
ContactHolder contactHolder;
public ContactAdapter(Context context, int resource) {
super(context, resource);
}
public void add(List<Contacts> updatedList) {
list.clear();
list.addAll(updatedList);
notifyDataSetChanged();
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public int getCount() {
return list.size();
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
row = convertView;
if(row==null){
LayoutInflater layoutInflater = (LayoutInflater)this.getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = layoutInflater.inflate(R.layout.view_symptom_layout,parent,false);
contactHolder = new ContactHolder();
contactHolder.Name =(TextView) row.findViewById(R.id.textView2);
contactHolder.Age =(TextView) row.findViewById(R.id.textView3);
contactHolder.Height =(TextView) row.findViewById(R.id.textView4);
contactHolder.Weight =(TextView) row.findViewById(R.id.textView5);
contactHolder.Symptom =(TextView) row.findViewById(R.id.textView6);
contactHolder.button = (Button) row.findViewById(R.id.button3);
contactHolder.button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name;
name = nt.newList.get(position).getName(); // This is where I'm stucked.
Toast.makeText(getContext().getApplicationContext(), name+" is served ", Toast.LENGTH_LONG).show();
}
});
row.setTag(contactHolder);
}
else{
contactHolder = (ContactHolder)row.getTag();
}
Contacts contacts = (Contacts)this.getItem(position);
contactHolder.Name.setText("Name: "+contacts.getName());
contactHolder.Age.setText("Age: "+contacts.getAge());
contactHolder.Height.setText("Height: "+contacts.getHeight());
contactHolder.Weight.setText("Weight: "+contacts.getWeight());
contactHolder.Symptom.setText("Symptoms: "+contacts.getSymptom());
return row;
}
static class ContactHolder{
TextView Name;
TextView Age;
TextView Height;
TextView Weight;
TextView Symptom;
Button button;
}
}
这是我从服务器检索所有值并将其存储在listview中的类：
package com.example.sohan.doctor;
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.TextView;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Sohan on 6/25/2016.
*/
public class notification extends Fragment implements AdapterView.OnItemSelectedListener{
public final static String Message = "Sohan";
View myView;
String selectedCity;
Context myContext;
String jsonResult;
JSONObject jsonObject;
JSONArray jsonArray;
String JSON_String;
ContactAdapter contactAdapter;
ListView listView;
List<Contacts> newList;
Button button;
String send;
public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
myView = inflater.inflate(R.layout.notification, container, false);
myContext = inflater.getContext();
contactAdapter = new ContactAdapter(myContext, R.layout.view_symptom_layout);
listView = (ListView)myView.findViewById(R.id.listView);
listView.setAdapter(contactAdapter);
retrieveInfo ri = new retrieveInfo();
ri.execute();
return myView;
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
class retrieveInfo extends AsyncTask<Void, Void, String> { // send data to server
String myUrl;
protected void onPreExecute() {
myUrl ="httP://myserver.com"; // change php script
}
protected String doInBackground(Void... args) {
String city;
String result = null;
JSONArray jsonArray = null;
try{
URL url = new URL(myUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setDoOutput(true);
OutputStream outputStream = httpURLConnection.getOutputStream();
BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(outputStream, "UTF-8"));
// String data_to_send = URLEncoder.encode("city", "UTF-8")+"="+URLEncoder.encode(city,"UTF-8");
//bufferedWriter.write(data_to_send);
bufferedWriter.flush();
bufferedWriter.close();
outputStream.close();
InputStream is = httpURLConnection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
while ((JSON_String = reader.readLine()) != null)
{
sb.append(JSON_String+"\n");
}
reader.close();
httpURLConnection.disconnect();
is.close();
return sb.toString().trim();
}catch(MalformedURLException e){
e.printStackTrace();
}catch(IOException f){
f.printStackTrace();
}
return null;
}
protected void onPostExecute(String result) {
jsonResult = result;
parseJSON(jsonResult);
}
}
public void parseJSON(String json){
Contacts contacts=null;
try {
jsonObject = new JSONObject(json);
jsonArray = jsonObject.getJSONArray("patient");
int count = 0;
String name,age,height,weight,symptom;
newList = new ArrayList<Contacts>();
while (count < jsonArray.length()) {
JSONObject jo = jsonArray.getJSONObject(count);
name = jo.getString("Name"); // data's are send to store in and print in listview
age = jo.getString("Age");
height = jo.getString("Height");
weight = jo.getString("Weight");
symptom = jo.getString("Symptom");
contacts = new Contacts(name,age,height,weight,symptom);
newList.add(contacts); // data are stored in the newlist array
count++;
}
contactAdapter.add(newList); // the newlist array are send to add in the listview
} catch (Exception e) {
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
name = nt.newList.get(position).getName();
我认为应该是：
name = list.get(position).getName();
您还可以阅读这篇文章： ListView with Add and Delete Buttons in each Row in android
答案 1 :(得分：0)
您可以进行更多更改，例如以下内容。
ContactAdapter extends ArrayAdapter<Contacts>
List<Contacts> list = new ArrayList<Contacts>();
这一行：
String name,age,height,weight,symptom;
你应该将while循环初始化为null ""