Android - มีปัญหาอยู่ว่า ทำไม่ กด selete แล้วมันไม่ show ในหน้าหลักอ่าครับ

 public void select() { //------------ Method to select data ---------------//
    	tv_res.setText("");
		InputStream is = null;
		String js_result = "";
		try {			
			HttpClient httpclient = new DefaultHttpClient();
			HttpPost httppost = new HttpPost("http://127.0.0.1:80/php_get_data.php");			
			HttpResponse response = httpclient.execute(httppost);
			HttpEntity entity = response.getEntity();
			is = entity.getContent();
			Toast.makeText(getApplicationContext(), "yse !!! ",Toast.LENGTH_SHORT).show();
		} catch (Exception e) {
			Log.d("log_err", "Error in http connection " + e.toString());
			Toast.makeText(getApplicationContext(), "No selete",Toast.LENGTH_SHORT).show();
		}				
		try {
			BufferedReader reader = new BufferedReader(new InputStreamReader(is,"utf8_bin"));
			StringBuilder sb = new StringBuilder();
			String line = null;
			while ((line = reader.readLine()) != null) {
				sb.append(line);
			}
			is.close();
			js_result = sb.toString();
		} catch (Exception e) {
			Log.e("log_tag", "Error converting result " + e.toString());
		}
		try {						
			final JSONArray jArray = new JSONArray(js_result);
			for (int i = 0; i < jArray.length(); i++) {
				JSONObject jo = jArray.getJSONObject(i);
				String hn = jo.getString("hn");
				String name = jo.getString("name");				
				String age = String.valueOf(jo.getInt("age"));
				String date_serv  = jo.getString("date_serv");			
				Log.d("log",hn+","+name+","+age+","+date_serv);
				tv_res.append(hn+","+name+","+age+","+date_serv+"\n");
			}				
		} catch (JSONException e) {
			Log.e("log_tag", "Error parsing data " + e.toString());
			Toast.makeText(getApplicationContext(), "No show ",Toast.LENGTH_SHORT).show();
		} 		
}  
    

<?php
header("content-type:text/javascript;charset=utf-8");  
$con=mysql_connect('127.0.0.1','root','1234')or die(mysql_error());  // เปลี่ยน localhost เป็น ip ของ mysql server
mysql_select_db('android')or die(mysql_error());
mysql_query("SET NAMES UTF8");
$sql="SELECT * FROM patient";
$res=mysql_query($sql);
while($row=mysql_fetch_assoc($res)){
	$output[]=$row;
}
print(json_encode($output));
mysql_close();
?>