android - 我无法将 Android 与 codeigniter 连接

Question

这是我的代码。我和他们一起工作了 2 天。我认为我的问题出在 codeigniter 部分，因为我的 android 代码适用于普通 php。当我使用普通的 php 代码时，我收到了“登录成功”的消息。但是，当我使用 codeigniter 时，我收到了“有问题”的消息。我也收到此错误消息。

08-14 20:49:06.077: W/System.err(1660): org.json.JSONException: java.lang.String 类型的致命值无法转换为 JSONObject

08-14 20:49:06.077: W/System.err(1660): 在 com.example.test2.MainActivity$1.onClick(MainActivity.java:79)

这是我的代码。

安卓

    public class MainActivity extends Activity {

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

        // Permission StrictMode
        if (android.os.Build.VERSION.SDK_INT > 9) {
            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
                    .permitAll().build();
            StrictMode.setThreadPolicy(policy);
        }

        final AlertDialog.Builder ad = new AlertDialog.Builder(this);

        // txtUsername & txtPassword
        final EditText txtUser = (EditText) findViewById(R.id.txtUsername);
        final EditText txtPass = (EditText) findViewById(R.id.txtPassword);

        // btnLogin
        final Button btnLogin = (Button) findViewById(R.id.btnLogin);
        // Perform action on click
        btnLogin.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {

                String url = "http://sit-edu4.sit.kmutt.ac.th/csc498/53270323/Boss/sftrip/application/controllers/checkLogin.php";
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("strUser", txtUser.getText()
                        .toString()));
                params.add(new BasicNameValuePair("strPass", txtPass.getText()
                        .toString()));

                String resultServer = getHttpPost(url, params);

                /*** Default Value ***/
                String success = "0";
                String error = "0";
                String error_msg = "Unknow Status!";

                JSONObject c;
                try {
                    c = new JSONObject(resultServer);
                    success = c.getString("success");
                    error = c.getString("error");
                    error_msg = c.getString("error_msg");

                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                // Prepare Login
                if (error.equals("1")) {
                    // Dialog
                    ad.setTitle("Error! ");
                    ad.setIcon(android.R.drawable.btn_star_big_on);
                    ad.setPositiveButton("Close", null);
                    ad.setMessage(error_msg);
                    ad.show();
                    txtUser.setText("");
                    txtPass.setText("");
                } else if (success.equals("1")) {
                    Toast.makeText(MainActivity.this, "Login OK",
                            Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(MainActivity.this, "Something wrong",
                            Toast.LENGTH_SHORT).show();
                }

            }
        });

    }

    public String getHttpPost(String url, List<NameValuePair> params) {
        StringBuilder str = new StringBuilder();
        HttpClient client = new DefaultHttpClient();
        HttpPost httpPost = new HttpPost(url);

        try {
            httpPost.setEntity(new UrlEncodedFormEntity(params));
            HttpResponse response = client.execute(httpPost);
            StatusLine statusLine = response.getStatusLine();
            int statusCode = statusLine.getStatusCode();
            if (statusCode == 200) { // Status OK
                HttpEntity entity = response.getEntity();
                InputStream content = entity.getContent();
                BufferedReader reader = new BufferedReader(
                        new InputStreamReader(content));
                String line;
                while ((line = reader.readLine()) != null) {
                    str.append(line);
                }
            } else {
                Log.e("Log", "Failed to download result..");
            }
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str.toString();
    }
}

普通的php代码

    <?
    $objConnect = mysql_connect("mydb-pj.sit.kmutt.ac.th","s53270327csc498","Y44TECWK");
    $objDB = mysql_select_db("s53270327csc498db");

    //$_POST["strUser"] = "weerachai"; // for Sample
    //$_POST["strUser"] = "weerachai@1";  // for Sample

    $strUsername = $_POST["strUser"];
    $strPassword = $_POST["strPass"];
    $strSQL = "SELECT * FROM personal_information WHERE email = '$strUsername' AND password = '$strPassword'";

    $objQuery = mysql_query($strSQL);
    $objResult = mysql_fetch_array($objQuery);
    $intNumRows = mysql_num_rows($objQuery);
    if($intNumRows==0)
    {
        $arr['success'] = "0"; 
        $arr['error'] = "1"; 
        $arr['error_msg'] = "Incorrect Username and Password";  
    }
    else
    {
        $arr['success'] = "1"; 
        $arr['error'] = "0"; 
        $arr['error_msg'] = ""; 
    }

    mysql_close($objConnect);

    echo json_encode($arr);
?>

代码点火器

    <?php
class Test extends CI_Controller {
    public function __construct() {
        parent::__construct();
        /*
         load you helper library
         */
        /*
         load you model
         */
        $this -> load -> model('login_model');
    }

    function test() {
        //$tag = $this -> input -> post('tag');
        //if ($tag == 'login') {
        $email = $this -> input -> post("strUser");
        $password = $this -> input -> post("strPass");
        $response = array('success' => "0", 'error' => "0", 'error_msg' => "Unknown");
        if ($email == null || $password == null) {
            $response['error'] = "1";
            $response['error_msg'] = "Both email and password must be filled";
            //echo json_encode($response);
        } else {
            $query = $this -> login_model -> validate_email_password($email, $password);
            if ($query) {
                $arr['success'] = "1";
                $arr['error'] = "0";
                $arr['error_msg'] = "";
                //echo json_encode($response);
            } else {
                $arr['success'] = "0";
                $arr['error'] = "1";
                $arr['error_msg'] = "Incorrect Username and Password";
            }
        }
        echo json_encode($arr);
    }
}
?>

请帮我。谢谢你。