急！新手求助！关于Android调用webservice出错！！

v155449508 2013-07-08 09:25:42

我是完全根据这个教程复制的代码：
http://www.androidhive.info/2012/01/android-login-and-registration-with-php-mysql-and-sqlite/

然后把mysql的用户密码什么的都改成我自己的了。但还是出现了错误。

下面是其中一个出错的activity的代码：



package com.example.androidhive;

 

import org.json.JSONException;

import org.json.JSONObject;

 

import com.example.androidhive.library.DatabaseHandler;

import com.example.androidhive.library.UserFunctions;

 

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

 

public class RegisterActivity extends Activity {

    Button btnRegister;

    Button btnLinkToLogin;

    EditText inputFullName;

    EditText inputEmail;

    EditText inputPassword;

    TextView registerErrorMsg;

     

    // JSON Response node names

    private static String KEY_SUCCESS = "success";

    private static String KEY_ERROR = "error";

    private static String KEY_ERROR_MSG = "error_msg";

    private static String KEY_UID = "uid";

    private static String KEY_NAME = "name";

    private static String KEY_EMAIL = "email";

    private static String KEY_CREATED_AT = "created_at";

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.register);

 

        // Importing all assets like buttons, text fields

        inputFullName = (EditText) findViewById(R.id.registerName);

        inputEmail = (EditText) findViewById(R.id.registerEmail);

        inputPassword = (EditText) findViewById(R.id.registerPassword);

        btnRegister = (Button) findViewById(R.id.btnRegister);

        btnLinkToLogin = (Button) findViewById(R.id.btnLinkToLoginScreen);

        registerErrorMsg = (TextView) findViewById(R.id.register_error);

         

        // Register Button Click event

        btnRegister.setOnClickListener(new View.OnClickListener() {         

            public void onClick(View view) {

                String name = inputFullName.getText().toString();

                String email = inputEmail.getText().toString();

                String password = inputPassword.getText().toString();

                UserFunctions userFunction = new UserFunctions();

                JSONObject json = userFunction.registerUser(name, email, password);

                 

                // check for login response

                try {

                    if (json.getString(KEY_SUCCESS) != null && json.getString(KEY_SUCCESS)!="") {

                        registerErrorMsg.setText("");

                        String res = json.getString(KEY_SUCCESS); 

                        if(Integer.parseInt(res) == 1){

                            // user successfully registred

                            // Store user details in SQLite Database

                            DatabaseHandler db = new DatabaseHandler(getApplicationContext());

                            JSONObject json_user = json.getJSONObject("user");

                             

                            // Clear all previous data in database

                            userFunction.logoutUser(getApplicationContext());

                            db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));                        

                            // Launch Dashboard Screen

                            Intent dashboard = new Intent(getApplicationContext(), DashboardActivity.class);

                            // Close all views before launching Dashboard

                            dashboard.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                            startActivity(dashboard);

                            // Close Registration Screen

                            finish();

                        }else{

                            // Error in registration

                            registerErrorMsg.setText("Error occured in registration");

                        }

                    }

                } catch (JSONException e) {

                    e.printStackTrace();

                }

            }

        });

 

        // Link to Login Screen

        btnLinkToLogin.setOnClickListener(new View.OnClickListener() {

 

            public void onClick(View view) {

                Intent i = new Intent(getApplicationContext(),

                        LoginActivity.class);

                startActivity(i);

                // Close Registration View

                finish();

            }

        });

    }

}

然后下面是logcat：



07-08 12:50:08.025: E/JSON(655): <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">n<html><head>n<title>404 Not Found</title>n</head><body>n<h1>Not Found</h1>n<p>The requested URL /ah_login_api/ was not found on this server.</p>n</body></html>n

07-08 12:50:08.025: E/JSON Parser(655): Error parsing data org.json.JSONException: Value <!DOCTYPE of type java.lang.String cannot be converted to JSONObject

07-08 12:50:08.035: D/AndroidRuntime(655): Shutting down VM

07-08 12:50:08.035: W/dalvikvm(655): threadid=1: thread exiting with uncaught exception (group=0x40015560)

07-08 12:50:08.045: E/AndroidRuntime(655): FATAL EXCEPTION: main

07-08 12:50:08.045: E/AndroidRuntime(655): java.lang.NullPointerException

07-08 12:50:08.045: E/AndroidRuntime(655): 	at com.example.androidhive.RegisterActivity$1.onClick(RegisterActivity.java:59)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at android.view.View.performClick(View.java:2485)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at android.view.View$PerformClick.run(View.java:9080)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at android.os.Handler.handleCallback(Handler.java:587)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at android.os.Handler.dispatchMessage(Handler.java:92)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at android.os.Looper.loop(Looper.java:123)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at android.app.ActivityThread.main(ActivityThread.java:3683)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at java.lang.reflect.Method.invokeNative(Native Method)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at java.lang.reflect.Method.invoke(Method.java:507)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

07-08 12:50:08.045: E/AndroidRuntime(655): 	at dalvik.system.NativeStart.main(Native Method)