how to set button to list from webservice

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Mobile

Android

Hi
i am getting a listview from webservices..
i need a button to set for it..
since user clicks a button then it should get listed..


guide me please.. this is my code

package info.androidhive.jsonparsing;

import java.util.ArrayList;
import java.util.HashMap;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ListActivity {

private ProgressDialog pDialog;

// URL to get contacts JSON
private static String url = "http://www.mouthyapp.com/json.php?action=searchUser&keyword=a";

// JSON Node names
private static final String TAG_TEXT_REAL = "userRealName";
private static final String TAG_TEXT_LAST = "userLastName";
private static final String TAG_TEXT_CHAT = "userChatName";
private static final String TAG_ID = "userId";
private static final String TAG_PROFILE = "userProfilePicture";

private static final String TAG_SEARCH = "userProfilePicture";
// contacts JSONArray
JSONArray contacts = null;

// Hashmap for ListView
ArrayList<hashmap><string,>> contactList;

EditText eText;
Button btn;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

eText = (EditText) findViewById(R.id.inputsearch);
btn = (Button) findViewById(R.id.sample);

btn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// String str = eText.getText().toString();
{
Log.v("EditText",eText.getText().toString());
}
}
});



contactList = new ArrayList<hashmap><string,>>();

ListView lv = getListView();
//
// Calling async task to get json
new GetContacts().execute();
}

/**
* Async task class to get json by making HTTP call
* */
private class GetContacts extends AsyncTask<void,> {

@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Please wait...");
pDialog.setCancelable(false);
pDialog.show();

}

@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
ServiceHandler sh = new ServiceHandler();

// Making a request to url and getting response
String jsonStr = sh.makeServiceCall(url, ServiceHandler.GET);

Log.d("Response: ", "> " + jsonStr);

if (jsonStr != null) {
try {
JSONArray array = new JSONArray(jsonStr);

// looping through All Contacts
for (int i = 0; i < array.length(); i++) {
JSONObject c = array.getJSONObject(i);
HashMap<string,> map = new HashMap<string,>();
String name = c.getString(TAG_TEXT_REAL);
String last = c.getString(TAG_TEXT_LAST);
String user = c.getString(TAG_TEXT_CHAT);

Log.v("id", last);
Log.v("name", name);
// tmp hashmap for single contact

// adding each child node to HashMap key => value
map.put(TAG_TEXT_REAL, name);
map.put(TAG_TEXT_LAST, last);
map.put(TAG_TEXT_CHAT, user);

// adding contact to contact list
contactList.add(map);
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
Log.e("ServiceHandler", "Couldn't get any data from the url");
}

return null;
}

@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
/**
* Updating parsed JSON data into ListView
* */
ListAdapter adapter = new SimpleAdapter(MainActivity.this,
contactList, R.layout.list_item, new String[] {
TAG_TEXT_REAL, TAG_TEXT_LAST, TAG_TEXT_CHAT },
new int[] { R.id.name, R.id.last, R.id.user });

setListAdapter(adapter);
}

}

}