안드로이드 php 연동 질문입니다.

   btn1.setOnClickListener(new View.OnClickListener() {
@Override
 public void onClick(View v) {

try {
            PHPRequest request = new PHPRequest("http://hankh113.maru.net/login.php");
            String result = request.PhPtest3(String.valueOf(edt1.getText()), String.valueOf(edt2.getText()));
if (result.equals("1")) {
                Toast.makeText(getApplication(), "아이디를 확인해주세요.", Toast.LENGTH_LONG).show();
            }else if(result.equals("2")){
                Toast.makeText(getApplication(), "비밀번호를 확인해주세요.", Toast.LENGTH_SHORT).show();

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

    }
});

------

   public String PhPtest3(final String data1,final String data2) {
try {
            String postData = "Data1=" + data1 + "&" + "Data2=" + data2;
            Log.i("PHPRequest", "request was failed.1");
            HttpURLConnection conn = (HttpURLConnection)url.openConnection();
            Log.i("PHPRequest", "request was failed.2");
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            Log.i("PHPRequest", "request was failed.3");
            conn.setRequestMethod("POST");
            Log.i("PHPRequest", "request was failed.4");
            conn.setConnectTimeout(5000);
            Log.i("PHPRequest", "request was failed.5");
            conn.setDoOutput(true);
            Log.i("PHPRequest", "request was failed.6");
            conn.setDoInput(true);
            Log.i("PHPRequest", "request was failed.7");
            OutputStream outputStream = conn.getOutputStream();
            Log.i("PHPRequest", "request was failed.8");
            outputStream.write(postData.getBytes("UTF-8"));
            Log.i("PHPRequest", "request was failed.9");
            outputStream.flush();
            Log.i("PHPRequest", "request was failed.10");
            outputStream.close();
            Log.i("PHPRequest", "request was failed.11");
            String result = readStream(conn.getInputStream());
            Log.i("PHPRequest", "request was failed.12");
            conn.disconnect();
            Log.i("PHPRequest", "request was failed.13");
return result;
        }
catch (Exception e) {
            Log.i("PHPRequest", "request was failed.");
return null;
        }
    }
}

이런식인데요 널포인트 에러가 나더라구요 

login.php를 그냥 웹상에다가 찍었을때에는 0이 아닌값이 분명 찍히는데

어디서 잘못된건가 해서 log를 일일이 다 찍어봤더니 

Log.i("PHPRequest", "request was failed.7"); <----이부분까지 로그가 찍히고 캐치문으로 넘어가더라구요.

오류가 난 부분은 알겠는데 왜 그러는지 도통모르겠어서 꽤 오래붙잡고 있는지라 더이상 시간지체할 수가 없어서 물어봅니다.

부탁드리겠습니다.