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Provides classes that manage application preferences and implement the preferences UI.
Using these ensures that all the preferences within each application are maintained
in the same manner and the user experience is consistent with that of the system and
other applications.
The preferences portion of an application
should be ran as a separate {@link} that extends
the {@link android.preference.PreferenceActivity} class. In the PreferenceActivity, a
{@link android.preference.PreferenceScreen} object should be the root element of the layout.
The PreferenceScreen contains {@link android.preference.Preference} elements such as a
{@link android.preference.CheckBoxPreference}, {@link android.preference.EditTextPreference},
{@link android.preference.ListPreference}, {@link android.preference.PreferenceCategory},
or {@link android.preference.RingtonePreference}. </p>
All settings made for a given {@link android.preference.Preference} will be automatically saved
to the application's instance of {@link android.content.SharedPreferences}. Access to the
SharedPreferences is simple with {@link android.preference.Preference#getSharedPreferences()}.</p>
Note that saved preferences are accessible only to the application that created them.</p>