Data That is Fetched From The Web Server Are Appending

package learn2crack.listview;

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

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

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.EditText;

import learn2crack.listview.library.JSONParser;

public class MainActivity extends Activity {
	ListView list;
	TextView title;
	Button Btngetdata;
	ArrayList<HashMap<String, String>> oslist = new ArrayList<HashMap<String, String>>();
	
	//JSON Node Names 
	private static final String TAG_NEWS = "news";
	private static final String TAG_TITLE = "title";
	
	JSONArray android = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
      
        setContentView(R.layout.activity_main);
        oslist = new ArrayList<HashMap<String, String>>();
        
        Btngetdata = (Button)findViewById(R.id.getdata);
        Btngetdata.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View view) {
		         new JSONParse().execute();
			}
		});
    }
    
    private class JSONParse extends AsyncTask<String, String, JSONObject> {
    	 private ProgressDialog pDialog;
    	@Override
        protected void onPreExecute() {
            super.onPreExecute();
             title = (TextView)findViewById(R.id.title);
            pDialog = new ProgressDialog(MainActivity.this);
            pDialog.setMessage("Getting Data ...");
            pDialog.setIndeterminate(false);
            pDialog.setCancelable(true);
            pDialog.show();
    	}
    	
    	@Override
        protected JSONObject doInBackground(String... args) {
    		
    		JSONParser jParser = new JSONParser();

    		String url = "http://localhost/abc-news/news.php?json-request-news=";
    	
    		EditText id = (EditText)findViewById(R.id.search_text);
    		
    		url = url + id.getText().toString();
    		
    		// Getting JSON from URL
    		JSONObject json = jParser.getJSONFromUrl(url);
    		return json;
    	}
    	
    	 @Override
         protected void onPostExecute(JSONObject json) {
    		 pDialog.dismiss();
    		 try {
    				// Getting JSON Array from URL
    				android = json.getJSONArray(TAG_NEWS);
    				for(int i = 0; i < android.length(); i++){
    				JSONObject c = android.getJSONObject(i);
    				
    				// Storing  JSON item in a Variable
    				String title = c.getString(TAG_TITLE);	
    				
    				// Adding value HashMap key => value

    				HashMap<String, String> map = new HashMap<String, String>();

    				map.put(TAG_TITLE, title);
    				
    				oslist.add(map);
    				list=(ListView)findViewById(R.id.list);

    				ListAdapter adapter = new SimpleAdapter(MainActivity.this, oslist,
    						R.layout.list_v,
    						new String[] { TAG_TITLE }, new int[] {
    								R.id.title });

    				list.setAdapter(adapter);
    				list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    		            @Override
    		            public void onItemClick(AdapterView<?> parent, View view,
    		                                    int position, long id) {
    		                Toast.makeText(MainActivity.this, "You Clicked at "+oslist.get(+position).get("name"), Toast.LENGTH_SHORT).show();

    		            }
    		        });

    				}
    		} catch (JSONException e) {
    			e.printStackTrace();
    		} 
    	 }
    }
}