How to get a specific String out from a ListView Item

Question

What I'm trying to do

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Hello Guys, I'm creating an App for a friend of mine, i simply show his Channel in my App. I get the Data of the Videos over JSON.

Now I found a Problem. When I filled the data into my ListView over the SimpleListAdapter and try to get it over an OnItemClickListner and retrieve them over lv.getItemAtPosition(position); I get all data which is stored in the specific row. But I only need the Link/Url I saved in that field.

Question

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Like you read I got more than one information in my ListView to be exactly there are four Strings (Thumb,Title, Content, Link). But I only need to get the String of the Link, how can I do this, down here you find the Code.

Code

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test2.java

package de.stepforward;

import java.io.BufferedReader;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import org.apache.http.NameValuePair;
import org.json.JSONArray;
import org.json.JSONObject;



import android.app.ListActivity;
import android.database.Cursor;
import android.media.RingtoneManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class test2 extends ListActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    String result = "";
    String line = null;
    ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();


    //get the Data from URL
    try{
    URL url = new URL("http://gdata.youtube.com/feeds/mobile/users/TheStepForward/uploads?alt=json&format=1"); 

    URLConnection conn = url.openConnection();
    StringBuilder sb = new StringBuilder();
    BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));

    //read d response till d end
    while ((line = rd.readLine()) != null) {
    sb.append(line + "\n");
    }
    result = sb.toString();
    Log.v("log_tag", "Append String " + result);
    } catch (Exception e) {
    Log.e("log_tag", "Error converting result " + e.toString());
    }

    try{
        JSONObject json = new JSONObject(result);
        JSONObject feed = json.getJSONObject("feed");
        JSONArray entrylist = feed.getJSONArray("entry");

        for(int i=0;i<entrylist.length();i++){
            //Get Title
            JSONObject movie = entrylist.getJSONObject(i);
            JSONObject title = movie.getJSONObject("title");
            String txtTitle = title.getString("$t");
            Log.d("Title", txtTitle);

            //Get Description
            JSONObject content = movie.getJSONObject("content");
            String txtContent = content.getString("$t");
            Log.d("Content", txtContent);

            //Get Link
            JSONArray linklist = movie.getJSONArray("link");
            JSONObject link = linklist.getJSONObject(0);
            String txtLink = link.getString("href");
            Log.d("Link", txtLink);


            //Get Thumbnail
            JSONObject medialist = movie.getJSONObject("media$group");
            JSONArray thumblist = medialist.getJSONArray("media$thumbnail");
            JSONObject thumb = thumblist.getJSONObject(2);
            String txtThumb = thumb.getString("url");
            Log.d("Thumb", txtThumb.toString());


            //String Array daraus machen und in Hashmap füllen
            HashMap<String, String> map = new HashMap<String, String>();
            map.put("Thumb", txtThumb);
            map.put("Title", txtTitle);
            map.put("Content", txtContent);
            map.put("Link", txtLink);
            mylist.add(map);

        }
        //ListView füllen
        ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.lit, 
                new String[] { "Thumb","Title","Content","Link"}, 
                new int[] { R.id.img_video,R.id.txt_title,R.id.txt_subtitle});      
        setListAdapter(adapter);


        //OnClickLister um Youtube-Video zu öffnen
        final ListView lv = getListView();
            lv.setOnItemClickListener(new OnItemClickListener(){
                public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

                    lv.getItemAtPosition(position);

                }
            });



    }catch (Exception e) {
        Log.e("log_tag", "Error converting result " + e.toString());
        }
}
}

Thank you in Advance

Answer 1

 final ListView lv = getListView();
            lv.setOnItemClickListener(new OnItemClickListener(){
                public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

                   Map<String, String> map = mylist.get(position);
                   String link = map.get("Link");


                }
            });

Answer 2

Better way is to wrap your information in an Object and download the data from internet and make an Object and add it to any ArrayList.

For Example:

You will make an Java Object class. say: VideoInfo

public class VideoInfo
{
     String title, content, link, thumb;
     // define there setter getter
     // also a constructor with these params 
     public VideoInfo(String title,String content,String link,String thumb)
     {
          //set Values accordingly
     }
}

make a class level ArrayList

ArrayList<VideoInfo> myList = new ArrayList<VideoInfo>();

and when you get data from server parse it and save it like this way:

myList.add(new VideoInfo(txtTitle, txtContent, txtLink, txtThumb));

You will need customization of Adapter (e.g override getView()) to set data from your custom Ojbect (VideoInfo).

and then in your ListActivity in OnItemClickListener you will get your desired object like this way:

public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
    // you have class level ArrayList myList.
    myList.get(position).getLink();  //getLink() will be the getter of you field link in VideoInfo
}

Answer 3

lv.setOnItemClickListener(new OnItemClickListener(){

            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

            HashMap<String, String> selectedHashMapObject = (HashMap<String, String>)lv.getItemAtPosition(position);

            String selectedLink = selectedHashMapObject.get("Link"); 
}

Answer 4

For example, you can do something similar like this:

for(int i = 0; i < ((ListView)lv).getItemCount(); i++){
    Map<String, String> currentView =  (Map<String, String>) ((ListView)lv).getItemAtPosition(i);
    String cVId = currentView.get("id");
}

Answer 5

i think you can use this http://developer.android.com/reference/android/widget/CursorAdapter.html#getItem(int).

Cursor cursor = (Cursor) simple.getItem(position);

// retrieve the data from the cursor