实际示例中的共享首选项和编辑器（Android）关系

Question

我可以从Internet上编译与“共享首选项”相关的项目，但是我什至无法理解代码，即使尝试阅读文档也是如此。 您可以举一些现实的例子，看看其中有SharedPreferences和Editor吗？ 或您是否能看到任何与SharedPreferences与Editor的关系以及可以实现SharedPreferences的相关代码的场景。 我想了解基本知识。 谢谢。

            // Shared Preferences
            SharedPreferences pref;

            // Editor for Shared preferences
            Editor editor;

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

                /**
         * Create login session
         * */
        public void createLoginSession(String name, String email){
            // Storing login value as TRUE
            editor.putBoolean(IS_LOGIN, true);

            // Storing name in pref
            editor.putString(KEY_NAME, name);

            // Storing email in pref
            editor.putString(KEY_EMAIL, email);

            // commit changes
            editor.commit();
        }   
/**
         * 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, LoginActivity.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);
            }

        }



        /**
         * Get stored session data
         * */
        public HashMap<String, String> getUserDetails(){
            HashMap<String, String> user = new HashMap<String, String>();
            // user name
            user.put(KEY_NAME, pref.getString(KEY_NAME, null));

            // user email id
            user.put(KEY_EMAIL, pref.getString(KEY_EMAIL, null));

            // return user
            return user;
        }

        /**
         * Clear session details
         * */
        public void logoutUser(){
            // Clearing all data from Shared Preferences
            editor.clear();
            editor.commit();

            // After logout redirect user to Loing Activity
            Intent i = new Intent(_context, LoginActivity.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);
        }

        /**
         * Quick check for login
         * **/
        // Get Login State
        public boolean isLoggedIn(){
            return pref.getBoolean(IS_LOGIN, false);
        }

Answer 1

从开发人员指南本身

The SharedPreferences class provides a general framework that allows you to save and retrieve persistent key-value pairs of primitive data types. You can use SharedPreferences to save any primitive data: booleans, floats, ints, longs, and strings. This data will persist across user sessions (even if your application is killed).

基本上，这是一个xml，可为您提供数据/数据/“包名称” / shared_prefs

当前，它不支持多进程编辑/访问，但是可以满足您的目的。

您可以使用它来存储用户首选项，例如背景颜色，文本颜色，通知音等