从非默认文件中写入和读取首选项

Question

how can I write and read preferences to and from an non default file using androids preferences.

Following code is working but it is deprecated:

    public class MyPreferencesActivity extends PreferenceActivity 
    {
        protected void onCreate(Bundle savedInstanceState) 
        {
             super.onCreate(savedInstanceState);

             PreferenceManager prefMgr = getPreferenceManager();
             prefMgr.setSharedPreferencesName("my_preferences");
             prefMgr.setSharedPreferencesMode(MODE_WORLD_READABLE);

             addPreferencesFromResource(R.xml.preferences);
        }
    }

In addition I need to bind the custom preference file to my Activitiy/Fragment so that any user changes in the preferences by the user are saved automatically to the custom file.

The background is following: I'm writing a widget and every instance of that widget needs its own preferences. So I need to save and load the preference for every widget seperatly.

I did not find any solution for this without using deprecated code. Any help is really welcome :).

Answer 1

简单：

SharedPreferences prefs = context.getSharedPrefernces("fileName", 0);

Answer 2

To read and write settings on your own you can use the following code:

// Get preferences
SharedPreferences sharedPreferences =  PreferenceManager.setSharedPreferencesName("SomeFilename",0);
PreferenceManager.setSharedPreferencesMode(MODE_WORLD_READABLE);
// Read some values
String name = sharedPreferences.getString("Key", "defaultValue");
[...]
//Write preferences
SharedPreferences sharedPreferences = PreferenceManager.getSharedPreferencesName("SomeFilename", 0);
// Write some values
Editor editor = sharedPreferences.edit();
editor.putString("key", "someValue");
[...]
editor.commit();

Documentation can be found here .