SharedPreferences 的使用

原创
2013/04/27 12:22
阅读数 164
public interface

SharedPreferences

android.content.SharedPreferences

Class Overview


Interface for accessing and modifying preference data returned by getSharedPreferences(String, int). For any particular set of preferences, there is a single instance of this class that all clients share. Modifications to the preferences must go through an SharedPreferences.Editor object to ensure the preference values remain in a consistent state and control when they are committed to storage. Objects that are returned from the various get methods must be treated as immutable by the application.

Note: currently this class does not support use across multiple processes. This will be added later.

Developer Guides

For more information about using SharedPreferences, read the Data Storage developer guide.

public abstract SharedPreferences getSharedPreferences (String name, int mode)

Added in   API level 1

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 and MODE_WORLD_WRITEABLE to control permissions. The bit MODE_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.
Returns
  • Returns the single SharedPreferences instance that can be used to retrieve and modify the preference values.
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