编写Singleton类来管理Android SharedPreferences

概述我正在尝试编写一个单例类来监督涉及共享首选项的所有 *** 作. 我有3个首选项文件,常规,设置和临时文件 我希望能够使用此类来编写给定类型的首选项,例如： stg_full_screen: true // as boolean 这是我到目前为止所做的： import android.app.Activity;import android.content.Context;import android. 我正在尝试编写一个单例类来监督涉及共享首选项的所有 *** 作.

我有3个首选项文件,常规,设置和临时文件

我希望能够使用此类来编写给定类型的首选项,例如：

stg_full_screen: true // as boolean

这是我到目前为止所做的：

import androID.app.Activity;import androID.content.Context;import androID.content.SharedPreferences;public class SharedPrefManager extends Activity {    // Globals    private int GENERAL             = 1000;    private int SETTINGS            = 2000;    private int TEMP_STORE          = 3000;    private String PREF_GENERAL     = "com.example.general";    private String PREF_SETTINGS    = "com.example.settings";    private String PREF_TEMP_STORE  = "com.example.temp_store";    private SharedPreferences general;    private SharedPreferences settings;    private SharedPreferences tempStore;    private SharedPreferences.Editor general_editor;    private SharedPreferences.Editor settings_editor;    private SharedPreferences.Editor temp_store_editor;    // Instantiate singleton object    private static SharedPrefManager ourInstance = new SharedPrefManager();    public static SharedPrefManager getInstance() { return ourInstance; }    private SharedPrefManager() {        // Get handle on all preference files        general   = getSharedPreferences(PREF_GENERAL,Context.MODE_PRIVATE);        settings  = getSharedPreferences(PREF_SETTINGS,Context.MODE_PRIVATE);        tempStore = getSharedPreferences(PREF_TEMP_STORE,Context.MODE_PRIVATE);        // provision editors for all preference files        general_editor    = general.edit();        settings_editor   = settings.edit();        temp_store_editor = tempStore.edit();    }    private String read_prefs (String pref_name) {        // this method reads a preference and returns it        // IDeally,i would want to be able to return appropriate types by request        // e.g boolean,string        return null;    }    private voID write_prefs (String pref_name,String pref_val) {        // this method would take a preference and write the appropriate type to prefs    }    // this method determines where to put a preference by checking the name of the key    // this works because i use the following naming conventions    // stg_name for settings,tmp_name for all that goes into tempStore    private String resolve_pref_category (String path) {        if (path.startsWith("stn"))         return PREF_SETTINGS;        else if (path.startsWith("tmp"))    return PREF_TEMP_STORE;        else                                return PREF_GENERAL;    }}

我的问题是：

>这是明智的做法吗？
>我如何有效地确定偏好的类型？

谢谢

解决方法 通常,我使用这样的东西：

没有静态上下文引用,每个属性的静态getter / setter,在需要时,您可以为某些属性添加内存缓存值,以便从内存中更快地获取它,而不是从SharedPreferences中读取.明确的API.

public class SharedPreferencesManager {    private static final String APP_SETTINGS = "APP_SETTINGS";    // propertIEs    private static final String SOME_STRING_VALUE = "SOME_STRING_VALUE";    // other propertIEs...    private SharedPreferencesManager() {}    private static SharedPreferences getSharedPreferences(Context context) {        return context.getSharedPreferences(APP_SETTINGS,Context.MODE_PRIVATE);    }    public static String getSomeStringValue(Context context) {        return getSharedPreferences(context).getString(SOME_STRING_VALUE,null);    }    public static voID setSomeStringValue(Context context,String newValue) {        final SharedPreferences.Editor editor = getSharedPreferences(context).edit();        editor.putString(SOME_STRING_VALUE,newValue);        editor.commit();    }    // other getters/setters}

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