protected void onPostExecute(String s) {
    String err=null;

    try {
        JSONObject root = new JSONObject(s);
        JSONObject user_data = root.getJSONObject("user_data");
        NAME = user_data.getString("name");
        PASSWORD = user_data.getString("password");
        EMAIL = user_data.getString("email");
        if(NAME == ""){
            Toast.makeText(getApplicationContext(),
                    "Invlaid Login Details", Toast.LENGTH_LONG).show();
        }
    } catch (JSONException e) {
        e.printStackTrace();
        err = "Exception: "+e.getMessage();
    }

    Intent i = new Intent(ctx, Home.class);
    i.putExtra("name", NAME);
    i.putExtra("password", PASSWORD);
    i.putExtra("email", EMAIL);
    i.putExtra("err", err);
    startActivity(i);

}

require 'connection.php';
try{

    $username = filter_input(INPUT_POST, 'name');
    $pssword =  filter_input(INPUT_POST, 'password');

    if($username == "" )
    {
        $results = "Invalid Entry";
        echo json_encode(array("user_data"=>$results));
    }
    else
    {
        $stmt = $db->prepare('SELECT * '
                        . 'FROM users1 '
                        . 'WHERE name = :uname AND password = :password ');
        $stmt->bindParam(':uname', $username);
        $stmt->bindParam(':password', $pssword);
        $stmt->execute();
        $results = $stmt->fetch(PDO::FETCH_ASSOC);

        if($results > 0 ){

            $response = array();
            echo json_encode(array("user_data"=>$results));
        } else{
            $results = "No Record Found";
            $results["success"] = 0;
            $results["message"] = "No Record Found";
             die(json_encode($results));
        }
        }

    }catch(PDOException $e) {
    echo 'ERROR: ' . $e->getMessage();
    }
$stmt = NULL;
$results = NULL;
exit();
//}

Name ==  ""

"".equals(Name)