IT. Expert System.

Enclosing interface:

SharedPreferences

public static interface SharedPreferences.Editor

• Method Summary

  Methods

  Modifier and Type	Method and Description
  void	apply() Commit your preferences changes back from this Editor to the SharedPreferences object it is editing.
  SharedPreferences.Editor	clear() Mark in the editor to remove all values from the preferences.
  boolean	commit() Commit your preferences changes back from this Editor to the SharedPreferences object it is editing.
  SharedPreferences.Editor	putBoolean(String key, boolean value) Set a boolean value in the preferences editor, to be written back once commit() or apply() are called.
  SharedPreferences.Editor	putFloat(String key, float value) Set a float value in the preferences editor, to be written back once commit() or apply() are called.
  SharedPreferences.Editor	putInt(String key, int value) Set an int value in the preferences editor, to be written back once commit() or apply() are called.
  SharedPreferences.Editor	putLong(String key, long value) Set a long value in the preferences editor, to be written back once commit() or apply() are called.
  SharedPreferences.Editor	putString(String key, String value) Set a String value in the preferences editor, to be written back once commit() or apply() are called.
  SharedPreferences.Editor	putStringSet(String key, Set<String> values) Set a set of String values in the preferences editor, to be written back once commit() is called.
  SharedPreferences.Editor	remove(String key) Mark in the editor that a preference value should be removed, which will be done in the actual preferences once commit() is called.

• Method Detail

  • putString

    SharedPreferences.Editor putString(String key,
                                     String value)

    Set a String value in the preferences editor, to be written back once commit() or apply() are called.

    Parameters:

    key - The name of the preference to modify.

    value - The new value for the preference.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • putStringSet

    SharedPreferences.Editor putStringSet(String key,
                                        Set<String> values)

    Set a set of String values in the preferences editor, to be written back once commit() is called.

    Parameters:

    key - The name of the preference to modify.

    values - The new values for the preference.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • putInt

    SharedPreferences.Editor putInt(String key,
                                  int value)

    Set an int value in the preferences editor, to be written back once commit() or apply() are called.

    Parameters:

    key - The name of the preference to modify.

    value - The new value for the preference.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • putLong

    SharedPreferences.Editor putLong(String key,
                                   long value)

    Set a long value in the preferences editor, to be written back once commit() or apply() are called.

    Parameters:

    key - The name of the preference to modify.

    value - The new value for the preference.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • putFloat

    SharedPreferences.Editor putFloat(String key,
                                    float value)

    Set a float value in the preferences editor, to be written back once commit() or apply() are called.

    Parameters:

    key - The name of the preference to modify.

    value - The new value for the preference.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • putBoolean

    SharedPreferences.Editor putBoolean(String key,
                                      boolean value)

    Set a boolean value in the preferences editor, to be written back once commit() or apply() are called.

    Parameters:

    key - The name of the preference to modify.

    value - The new value for the preference.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • remove

    SharedPreferences.Editor remove(String key)

    Mark in the editor that a preference value should be removed, which will be done in the actual preferences once commit() is called.

    Note that when committing back to the preferences, all removals are done first, regardless of whether you called remove before or after put methods on this editor.

    Parameters:

    key - The name of the preference to remove.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • clear

    SharedPreferences.Editor clear()

    Mark in the editor to remove all values from the preferences. Once commit is called, the only remaining preferences will be any that you have defined in this editor.

    Note that when committing back to the preferences, the clear is done first, regardless of whether you called clear before or after put methods on this editor.

    Returns:

    Returns a reference to the same Editor object, so you can chain put calls together.

  • commit

    boolean commit()

    Commit your preferences changes back from this Editor to the SharedPreferences object it is editing. This atomically performs the requested modifications, replacing whatever is currently in the SharedPreferences.

    Note that when two editors are modifying preferences at the same time, the last one to call commit wins.

    If you don't care about the return value and you're using this from your application's main thread, consider using apply() instead.

    Returns:

    Returns true if the new values were successfully written to persistent storage.

  • apply

    void apply()

    Commit your preferences changes back from this Editor to the SharedPreferences object it is editing. This atomically performs the requested modifications, replacing whatever is currently in the SharedPreferences.

    Note that when two editors are modifying preferences at the same time, the last one to call apply wins.

    Unlike commit(), which writes its preferences out to persistent storage synchronously, apply() commits its changes to the in-memory SharedPreferences immediately but starts an asynchronous commit to disk and you won't be notified of any failures. If another editor on this SharedPreferences does a regular commit() while a apply() is still outstanding, the commit() will block until all async commits are completed as well as the commit itself.

    As SharedPreferences instances are singletons within a process, it's safe to replace any instance of commit() with apply() if you were already ignoring the return value.

    You don't need to worry about Android component lifecycles and their interaction with apply() writing to disk. The framework makes sure in-flight disk writes from apply() complete before switching states.

    The SharedPreferences.Editor interface isn't expected to be implemented directly. However, if you previously did implement it and are now getting errors about missing apply(), you can simply call commit() from apply().