Question

我创建了一个具有登录功能的应用。当用户第一次登录时，他的凭据将使用SharedPreferences保存。他下次登录时会直接重定向到第二个屏幕。我实现了注销功能。我清除了首选项，但是当我尝试从其他帐户登录时，我仍然可以获得之前帐户的详细信息。

这是我的代码： -

Main.java

private SessionManagement sessionManager;

sessionManager.createLoginSession(username, deviceUrl, deviceId, endPointHost, deviceName, name , encodedAccountNameToken, hostUrlToken);

SessionManagement.java

public class SessionManagement
{
     SharedPreferences pref;

        // Editor for Shared preferences
        Editor editor;

        // Context
        Context _context;

        // Shared pref mode
        int PRIVATE_MODE = 0;

        // Sharedpref file name
        private static final String PREF_NAME = "UserDetails";

        // All Shared Preferences Keys
        private static final String IS_LOGIN = "IsLoggedIn";

        // User name (make variable public to access from outside)
        public static final String KEY_EMAILID = "email";

        // Email address (make variable public to access from outside)
        public static final String KEY_DEVICEURL = "deviceurl";

        public static final String KEY_ENDPOINTHOST = "endpointhost";
        public static final String KEY_DEVICENAME = "devicename";
        public static final String KEY_USERSNAME = "usersname";
        public static final String KEY_ENCODEDACCOUNTNAME = "encodedaccountname";
        public static final String KEY_HOSTURL = "hosturl";
        public static final String KEY_DEVICEiD = "deviceid";

        public static final String  KEY_DEVICEREGISTERED = "deviceregistered";
        // Constructor
        public SessionManagement(Context context)
        {
            this._context = context;
            pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
            editor = pref.edit();
        }

        public void createLoginSession(String emailId, String deviceauthurl, String deviceid, String endpointhost, String devicename, String usersname, String encodedaccountname, String hosturl)
        {
            // Storing login value as TRUE
            editor.putBoolean(IS_LOGIN, true);

            editor.putBoolean(KEY_DEVICEREGISTERED, true);
            editor.putString(KEY_EMAILID, emailId);
            editor.putString(KEY_DEVICEURL, deviceurl);
            editor.putString(KEY_DEVICEiD, deviceid);
            editor.putString(KEY_ENDPOINTHOST, endpointhost);
            editor.putString(KEY_DEVICENAME,devicename);
            editor.putString(KEY_USERSNAME, usersname);
            editor.putString(KEY_ENCODEDACCOUNTNAME, encodedaccountname);
            editor.putString(KEY_HOSTURL, hosturl);

            // commit changes
            editor.commit();
        }

        /**
         * Get stored session data
         * */
        public HashMap<String, String> getUserDetails()
        {
            HashMap<String, String> user = new HashMap<String, String>();

            user.put(KEY_EMAILID, pref.getString(KEY_EMAILID, null));
             user.put(KEY_DEVICEAUTHURL, pref.getString(KEY_DEVICEAUTHURL, null));
            user.put(KEY_DEVICEiD, pref.getString(KEY_DEVICEiD, null));
            user.put(KEY_ENDPOINTHOST, pref.getString(KEY_ENDPOINTHOST, null));
            user.put(KEY_DEVICENAME, pref.getString(KEY_DEVICENAME, null));
            user.put(KEY_USERSNAME, pref.getString(KEY_USERSNAME, null));
            user.put(KEY_ENCODEDACCOUNTNAME, pref.getString(KEY_ENCODEDACCOUNTNAME, null));
            user.put(KEY_HOSTURL, pref.getString(KEY_HOSTURL, null));

            // return user
            return user;

        }
        /**
         * Check login method wil check user login status
         * If false it will redirect user to login page
         * Else won't do anything
         * */
        public void checkLogin()
        {
            // Check login status
            if(!this.isLoggedIn())
            {
                // user is not logged in redirect him to Login Activity
                Intent i = new Intent(_context, Login.class);
                // Closing all the Activities
                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                // Add new Flag to start new Activity
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                // Staring Login Activity
                  _context.startActivity(i);
            }

        }

       // This function clears all session data and redirect the user to LoginActivity
        /**
             * Clear session details
             * */
            public void logoutUser()
            {
                // Clearing all data from Shared Preferences
                //editor.clear();
                editor.remove(KEY_DEVICEURL);
                editor.remove(KEY_DEVICENAME);
                editor.remove(KEY_DEVICEREGISTERED);
                editor.remove(KEY_DEVICEiD);
                editor.remove(KEY_EMAILID);
                editor.remove(KEY_ENCODEDACCOUNTNAME);
                editor.remove(KEY_ENDPOINTHOST);
                editor.remove(KEY_HOSTURL);
                editor.remove(KEY_USERSNAME);
                editor.remove(IS_LOGIN);
                editor.remove(PREF_NAME);
                editor.clear();
                editor.commit();

                // After logout redirect user to Loing Activity
                Intent i = new Intent(_context, Login.class);
                // Closing all the Activities
                i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

                // Add new Flag to start new Activity
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                // Staring Login Activity
                _context.startActivity(i);
            }

            public boolean isLoggedIn()
            {
                return pref.getBoolean(IS_LOGIN, false);
            }
}

可能出现什么问题？

Answer 1

您的主要活动不包含完整来源。请确保您从MainActivity调用logoutUser方法

在主要活动中的ondestroy方法中调用logout函数。

Answer 2

在您注销时调用main.class中的session.logoutUser（）

Intent z = new Intent(this,main.class);
    z.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | 
          Intent.FLAG_ACTIVITY_CLEAR_TASK |
          Intent.FLAG_ACTIVITY_NEW_TASK);
    SharedPreferences prefs = getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = prefs.edit();
        editor.putString("EMP_ID"," ");
        editor.commit();
        session.logoutUser();
        startActivity(z);
        this.finish();

Answer 3

使用Context初始化SessionManagement。

public SessionManagement(Context context)
        {
            this._context = context;
            pref = _context.getSharedPreferences(PREF_NAME, PRIVATE_MODE);
            editor = pref.edit();
        }

这＆＃34; context＆＃34;不可用。

使用SharedPreferences注销功能

3 个答案: