How to use SharedPreferences in Android to store, fetch and edit values

I want to store a time value and need to
retrieve and edit it. How can I use SharedPreferences to do
this?

Answer

To obtain shared preferences, use the
following method
In your
activity:

SharedPreferences prefs
            = this.getSharedPreferences(
 "com.example.app",
            Context.MODE_PRIVATE);

To
read
preferences:

String
            dateTimeKey = "com.example.app.datetime";

// use a default value
            using new Date()
long l = prefs.getLong(dateTimeKey, new Date().getTime());
            

To edit and save
preferences

Date dt =
            getSomeDate();

prefs.edit().putLong(dateTimeKey,
            dt.getTime()).apply();

The
android sdk's sample directory contains an example of retrieving and storing shared
preferences. Its located in
the:

/samples/android-/ApiDemos
            directory

Edit==>

I
noticed, it is important to write difference between commit()
and apply() here as
well.

commit()
return true if value saved successfully otherwise
false. It save values to SharedPreferences
synchronously.

apply()
was added in 2.3 and doesn't return any value either on success or failure. It saves
values to SharedPreferences immediately but starts an
asynchronous commit.
More detail is href="http://developer.android.com/reference/android/content/SharedPreferences.Editor.html#apply()"
rel="noreferrer">here.