Android应用程序登录和注册错误
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【中文标题】Android应用程序登录和注册错误【英文标题】：Android application login and registration error 【发布时间】：2015-02-22 16:20:33 【问题描述】：我一直在关注使用 php、mysql 开发安卓登录和注册系统的教程。注册用户时，我的本地数据库 (xampp) 中添加了一条记录，但应用程序崩溃了。我已经查看了有关此问题的类似问题，但我仍然感到困惑并且找不到解决方案。
日志猫：
12-24 14:43:10.875: E/JSON(782): <br />
12-24 14:43:10.875: E/JSON(782): <b>Deprecated</b>: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in <b>G:\xampp\htdocs\learn2crack_login_api\include\DB_Connect.php</b> on line <b>18</b><br />
12-24 14:43:10.875: E/JSON(782): "tag":"register","success":1,"error":0,"user":"fname":"benmid","lname":"muli","email":"benmid@yahoo.com","uname":"benmid14","uid":"549ad0fcaf8052.70050491","created_at":"2014-12-24 14:43:08"
12-24 14:43:10.875: E/JSON Parser(782): Error parsing data org.json.JSONException: Value <br of type java.lang.String cannot be converted to JSONObject
12-24 14:43:10.905: D/androidRuntime(782): Shutting down VM
12-24 14:43:10.905: W/dalvikvm(782): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
12-24 14:43:10.915: E/AndroidRuntime(782): FATAL EXCEPTION: main
12-24 14:43:10.915: E/AndroidRuntime(782): java.lang.NullPointerException
12-24 14:43:10.915: E/AndroidRuntime(782): at com.learn2crack.Register$ProcessRegister.onPostExecute(Register.java:237)
12-24 14:43:10.915: E/AndroidRuntime(782): at com.learn2crack.Register$ProcessRegister.onPostExecute(Register.java:1)
12-24 14:43:10.915: E/AndroidRuntime(782): at android.os.AsyncTask.finish(AsyncTask.java:631)
12-24 14:43:10.915: E/AndroidRuntime(782): at android.os.AsyncTask.access$600(AsyncTask.java:177)
12-24 14:43:10.915: E/AndroidRuntime(782): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
12-24 14:43:10.915: E/AndroidRuntime(782): at android.os.Handler.dispatchMessage(Handler.java:99)
12-24 14:43:10.915: E/AndroidRuntime(782): at android.os.Looper.loop(Looper.java:137)
12-24 14:43:10.915: E/AndroidRuntime(782): at android.app.ActivityThread.main(ActivityThread.java:5041)
12-24 14:43:10.915: E/AndroidRuntime(782): at java.lang.reflect.Method.invokeNative(Native Method)
12-24 14:43:10.915: E/AndroidRuntime(782): at java.lang.reflect.Method.invoke(Method.java:511)
12-24 14:43:10.915: E/AndroidRuntime(782): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-24 14:43:10.915: E/AndroidRuntime(782): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-24 14:43:10.915: E/AndroidRuntime(782): at dalvik.system.NativeStart.main(Native Method)
DB_Functions 文件
<?php
class DB_Functions
private $db;
//put your code here
// constructor
function __construct()
require_once 'DB_Connect.php';
// connecting to database
$this->db = new DB_Connect();
$this->db->connect();
// destructor
function __destruct()
/**
* Random string which is sent by mail to reset password
*/
public function random_string()
$character_set_array = array();
$character_set_array[] = array('count' => 7, 'characters' => 'abcdefghijklmnopqrstuvwxyz');
$character_set_array[] = array('count' => 1, 'characters' => '0123456789');
$temp_array = array();
foreach ($character_set_array as $character_set)
for ($i = 0; $i < $character_set['count']; $i++)
$temp_array[] = $character_set['characters'][rand(0, strlen($character_set['characters']) - 1)];
shuffle($temp_array);
return implode('', $temp_array);
public function forgotPassword($forgotpassword, $newpassword, $salt)
$result = mysql_query("UPDATE `users` SET `encrypted_password` = '$newpassword',`salt` = '$salt'
WHERE `email` = '$forgotpassword'");
if ($result)
return true;
else
return false;
/**
* Adding new user to mysql database
* returns user details
*/
public function storeUser($fname, $lname, $email, $uname, $password)
$uuid = uniqid('', true);
$hash = $this->hashSSHA($password);
$encrypted_password = $hash["encrypted"]; // encrypted password
$salt = $hash["salt"]; // salt
$result = mysql_query("INSERT INTO users(unique_id, firstname, lastname, email, username, encrypted_password, salt, created_at) VALUES('$uuid', '$fname', '$lname', '$email', '$uname', '$encrypted_password', '$salt', NOW())");
// check for successful store
if ($result)
// get user details
$uid = mysql_insert_id(); // last inserted id
$result = mysql_query("SELECT * FROM users WHERE uid = $uid");
// return user details
return mysql_fetch_array($result);
else
return false;
/**
* Verifies user by email and password
*/
public function getUserByEmailAndPassword($email, $password)
$result = mysql_query("SELECT * FROM users WHERE email = '$email'") or die(mysql_error());
// check for result
$no_of_rows = mysql_num_rows($result);
if ($no_of_rows > 0)
$result = mysql_fetch_array($result);
$salt = $result['salt'];
$encrypted_password = $result['encrypted_password'];
$hash = $this->checkhashSSHA($salt, $password);
// check for password equality
if ($encrypted_password == $hash)
// user authentication details are correct
return $result;
else
// user not found
return false;
/**
* Check user is existed or not
*/
public function isUserExisted($email)
$result = mysql_query("SELECT email from users WHERE email = '$email'");
$no_of_rows = mysql_num_rows($result);
if ($no_of_rows > 0)
// user existed
return true;
else
// user not existed
return false;
/**
* Encrypting password
* returns salt and encrypted password
*/
public function hashSSHA($password)
$salt = sha1(rand());
$salt = substr($salt, 0, 10);
$encrypted = base64_encode(sha1($password . $salt, true) . $salt);
$hash = array("salt" => $salt, "encrypted" => $encrypted);
return $hash;
/**
* Decrypting password
* returns hash string
*/
public function checkhashSSHA($salt, $password)
$hash = base64_encode(sha1($password . $salt, true) . $salt);
return $hash;
?>
DB_Connect 文件
<?php
class DB_Connect
// constructor
function __construct()
// destructor
function __destruct()
// $this->close();
// Connecting to database
public function connect()
require_once 'include/config.php';
// connecting to mysql
$con = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
// selecting database
mysql_select_db(DB_DATABASE);
// return database handler
return $con;
// Closing database connection
public function close()
mysql_close();
?>
配置文件
<?php
/**
* Database config variables
*/
define("DB_HOST", "127.0.0.1");
define("DB_USER", "root");
define("DB_PASSWORD", "");
define("DB_DATABASE", "learn2crack_login_api");
?>
DatabaseHandler.java
package com.learn2crack.library;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.HashMap;
public class DatabaseHandler extends SQLiteOpenHelper
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "cloud_contacts";
// Login table name
private static final String TABLE_LOGIN = "login";
// Login Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_FIRSTNAME = "fname";
private static final String KEY_LASTNAME = "lname";
private static final String KEY_EMAIL = "email";
private static final String KEY_USERNAME = "uname";
private static final String KEY_UID = "uid";
private static final String KEY_CREATED_AT = "created_at";
public DatabaseHandler(Context context)
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db)
String CREATE_LOGIN_TABLE = "CREATE TABLE " + TABLE_LOGIN + "("
+ KEY_ID + " INTEGER PRIMARY KEY,"
+ KEY_FIRSTNAME + " TEXT,"
+ KEY_LASTNAME + " TEXT,"
+ KEY_EMAIL + " TEXT UNIQUE,"
+ KEY_USERNAME + " TEXT,"
+ KEY_UID + " TEXT,"
+ KEY_CREATED_AT + " TEXT" + ")";
db.execSQL(CREATE_LOGIN_TABLE);
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_LOGIN);
// Create tables again
onCreate(db);
/**
* Storing user details in database
* */
public void addUser(String fname, String lname, String email, String uname, String uid, String created_at)
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_FIRSTNAME, fname); // FirstName
values.put(KEY_LASTNAME, lname); // LastName
values.put(KEY_EMAIL, email); // Email
values.put(KEY_USERNAME, uname); // UserName
values.put(KEY_UID, uid); // Email
values.put(KEY_CREATED_AT, created_at); // Created At
// Inserting Row
db.insert(TABLE_LOGIN, null, values);
db.close(); // Closing database connection
/**
* Getting user data from database
* */
public HashMap<String, String> getUserDetails()
HashMap<String,String> user = new HashMap<String,String>();
String selectQuery = "SELECT * FROM " + TABLE_LOGIN;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// Move to first row
cursor.moveToFirst();
if(cursor.getCount() > 0)
user.put("fname", cursor.getString(1));
user.put("lname", cursor.getString(2));
user.put("email", cursor.getString(3));
user.put("uname", cursor.getString(4));
user.put("uid", cursor.getString(5));
user.put("created_at", cursor.getString(6));
cursor.close();
db.close();
// return user
return user;
/**
* Getting user login status
* return true if rows are there in table
* */
public int getRowCount()
String countQuery = "SELECT * FROM " + TABLE_LOGIN;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int rowCount = cursor.getCount();
db.close();
cursor.close();
// return row count
return rowCount;
/**
* Re crate database
* Delete all tables and create them again
* */
public void resetTables()
SQLiteDatabase db = this.getWritableDatabase();
// Delete All Rows
db.delete(TABLE_LOGIN, null, null);
db.close();
JSONParser.java
package com.learn2crack.library;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser()
public JSONObject getJSONFromUrl(String url, List<NameValuePair> params)
// Making HTTP request
try
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
catch (UnsupportedEncodingException e)
e.printStackTrace();
catch (ClientProtocolException e)
e.printStackTrace();
catch (IOException e)
e.printStackTrace();
try
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
sb.append(line + "\n");
is.close();
json = sb.toString();
Log.e("JSON", json);
catch (Exception e)
Log.e("Buffer Error", "Error converting result " + e.toString());
// try parse the string to a JSON object
try
jObj = new JSONObject(json);
catch (JSONException e)
Log.e("JSON Parser", "Error parsing data " + e.toString());
// return JSON String
return jObj;
UserFunctions.java
package com.learn2crack.library;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONObject;
import android.content.Context;
public class UserFunctions
private JSONParser jsonParser;
//URL of the PHP API
private static String loginURL = "http://10.0.2.2/learn2crack_login_api/";
private static String registerURL = "http://10.0.2.2/learn2crack_login_api/";
private static String forpassURL = "http://10.0.2.2/learn2crack_login_api/";
private static String chgpassURL = "http://10.0.2.2/learn2crack_login_api/";
private static String login_tag = "login";
private static String register_tag = "register";
private static String forpass_tag = "forpass";
private static String chgpass_tag = "chgpass";
// constructor
public UserFunctions()
jsonParser = new JSONParser();
/**
* Function to Login
**/
public JSONObject loginUser(String email, String password)
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", login_tag));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(loginURL, params);
return json;
/**
* Function to change password
**/
public JSONObject chgPass(String newpas, String email)
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", chgpass_tag));
params.add(new BasicNameValuePair("newpas", newpas));
params.add(new BasicNameValuePair("email", email));
JSONObject json = jsonParser.getJSONFromUrl(chgpassURL, params);
return json;
/**
* Function to reset the password
**/
public JSONObject forPass(String forgotpassword)
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", forpass_tag));
params.add(new BasicNameValuePair("forgotpassword", forgotpassword));
JSONObject json = jsonParser.getJSONFromUrl(forpassURL, params);
return json;
/**
* Function to Register
**/
public JSONObject registerUser(String fname, String lname, String email, String uname, String password)
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("tag", register_tag));
params.add(new BasicNameValuePair("fname", fname));
params.add(new BasicNameValuePair("lname", lname));
params.add(new BasicNameValuePair("email", email));
params.add(new BasicNameValuePair("uname", uname));
params.add(new BasicNameValuePair("password", password));
JSONObject json = jsonParser.getJSONFromUrl(registerURL,params);
return json;
/**
* Function to logout user
* Resets the temporary data stored in SQLite Database
* */
public boolean logoutUser(Context context)
DatabaseHandler db = new DatabaseHandler(context);
db.resetTables();
return true;
更新：我关闭了错误信息并将 mysql_* 更改为 mysqli。现在我收到以下错误：
12-24 15:33:34.971: E/JSON(863): "tag":"register","success":0,"error":1,"error_msg":"JSON Error occured in Registartion"
更新：问题已解决。我重新启动了应用程序，现在注册和登录工作正常。谢谢大家的支持。
【问题讨论】：
【参考方案1】：检查 json 的前几行：
<b>Deprecated</b>: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in <b>G:\xampp\htdocs\learn2crack_login_api\include\DB_Connect.php</b> on line <b>18</b><br /
由于此错误消息，您无法解析 json。 关闭错误消息以便快速修复。
但对于真正的解决方案，不要使用 mysql_* 函数。正如消息所说，它们已被弃用。请改用 mysqli_* 或 PDO。它们很简单，并且通过准备好的语句，它们是安全的。
【讨论】：
好主意，提一下准备好的语句，他当前的代码看起来对 SQL 注入开放。 它不仅看起来，而且很容易受到攻击。 :) 嗨，Gerifield 我关闭了错误消息，现在我的屏幕卡在“正在联系服务器，正在注册”。我收到以下错误：12-24 15:33:34.971: E/JSON(863): "tag":"register","success":0,"error":1,"error_msg":"JSON 错误发生在注册” json 本身现在是正确的。这是另一个错误和问题。连接正常，可能检查解析器。【参考方案2】：问题似乎是来自 PHP 代码的响应不是您的应用程序所期望的 JSON 字符串。 PHP 页面提供的是对mysql_connect 的弃用警告。
As per the PHP docs、mysql_connect 已弃用，取而代之的是 mysqli_connect。
或者，您可以更改error level that PHP uses not to display the deprecation message。
我最初认为您可以将 JSON 解码调用包装在 try/catch 中，但是在进一步检查您的代码之后，看起来您已经涵盖了这一点。相反，我意识到它可能是您的代码的其他部分未处理 null 值，如您提供的日志文件中所示稍低的值。确保您有适当的代码来检查可能的 null 值，以防止您的应用程序崩溃，在生产/实时环境中很容易发生这种情况。
【讨论】：
【参考方案3】：您从服务器接收的字符串不是有效的JSON 字符串。
参考下面的字符串：
<b>Deprecated</b>: mysql_connect(): The mysql extension is deprecated and will be removed in the future: use mysqli or PDO instead in <b>G:\xampp\htdocs\learn2crack_login_api\include\DB_Connect.php</b> on line <b>18</b><br />
这意味着，您应该切换到 mysqli 或 PDO，因为 mysql 扩展已被贬值。
替代解决方案：
关闭服务器上的所有 PHP 错误和警告。
【讨论】：
您不需要关闭所有错误和警告，您只需关闭弃用消息即可。 是的，但是在开发服务器上，而不是在实时服务器上。而是在每日日志文件中记录错误和警告。 您好 MTahir，我关闭了错误消息，现在我的屏幕卡在“正在联系服务器，正在注册”。我收到以下错误：12-24 15:33:34.971: E/JSON(863): "tag":"register","success":0,"error":1,"error_msg":"JSON 错误发生在注册”以上是关于Android应用程序登录和注册错误的主要内容，如果未能解决你的问题，请参考以下文章