SharedPreferences詳解
1、SharedPreferences的簡(jiǎn)單介紹
應(yīng)用程序在運(yùn)行的時(shí)候，可能會(huì)隨著用戶的使用而保持該用戶的配置信息，如上次播放時(shí)的eq設(shè)置，音量設(shè)置，上網(wǎng)的cookies信息等等，這些小量 的信息可以通過SharedPreferences來保持，通過SharedPreferences保持的數(shù)據(jù)為一個(gè)XML文件，位于應(yīng)用程序的私有文件夾。
2、具體操作方法
獲取SharedPreferences，可以通過以下方法獲取
public SharedPreferences getSharedPreferences (String name, int mode)
Retrieve and hold the contents of the preferences file 'name', returning a SharedPreferences through which you can retrieve and modify its values. Only one instance of the SharedPreferences object is returned to any callers for the same name, meaning they will see each other's edits as soon as they are made.
Parameters
| name | Desired preferences file. If a preferences file by this name does not exist, it will be created when you retrieve an editor (SharedPreferences.edit()) and then commit changes (Editor.commit()). |
|---|---|
| mode |
Operating mode. Use 0 or MODE_PRIVATE for the default operation,MODE_WORLD_READABLE andMODE_WORLD_WRITEABLE to control permissions. The bitMODE_MULTI_PROCESS can also be used if multiple processes are mutating the same SharedPreferences file.MODE_MULTI_PROCESS is always on in apps targetting Gingerbread (Android 2.3) and below, and off by default in later versions. |
參數(shù)簡(jiǎn)述：
Name————獲得SharedPreferences之后，將會(huì)在應(yīng)用程序的私有文件夾中保存著一個(gè)XML文件，第一個(gè)參數(shù)name就是這個(gè)文件名字。
Mode————XML文件的保存模式，默認(rèn)為0，也就是MODE_PRIVATE
3、簡(jiǎn)單的demo
通過service的一個(gè)音樂播放例子，“播放”與“暫停”兩個(gè)按鈕
暫停之后，保持播放進(jìn)度到SharedPreferences里面，然后再次播放的話，讀取進(jìn)度值進(jìn)行音樂播放。
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