android - SharedPreferences value is not updated

Question

I am trying to update the values of SharedPreferences, here is my code:

edit = PreferenceManager.getDefaultSharedPreferences(this).edit();
edit.putString(Settings.PREF_USERNAME+"",txtuser);
edit.putString(Settings.PREF_PASSWORD+"",txtpass);
edit.commit();" 

The problem is that when I am accessing this values, it is not returning updated values, it gives me a value of SharedPreferences.

But when I am confirming the data in XML file ,the data updated in that.

And after restarting my application I am getting that updated values. So it requires me to restart the application to get updated values.
So, how to get those updated values once it changes?

Thanks in advance

Here is my whole code:

@Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        ctx=this;

            status=PreferenceManager.getDefaultSharedPreferences(this).getString(Settings.PREF_STATUS, Settings.DEFAULT_STATUS);// get old value
        submit.setOnClickListener(new View.OnClickListener() {
          @Override
            public void onClick(View v) {

                  on(ctx,true);//  function will call and value is updated

                }
            }});    

     status=PreferenceManager.getDefaultSharedPreferences(this).getString(Settings.PREF_STATUS, Settings.DEFAULT_STATUS);// this should give me a updated value but gives old value

    }
    public static boolean on(Context context) {
        return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(Settings.PREF_ON, Settings.DEFAULT_ON);
    }

    public static void on(Context context,boolean on) {
            if (on) Receiver.engine(context).isRegistered(); //
        }




**********in reciver file***********
public void isRegistered ) {
        Editor edit = PreferenceManager.getDefaultSharedPreferences(Receiver.mContext).edit();
        edit.putString(Settings.PREF_STATUS+"","0");
        edit.commit();
}

Answer 1

Instead of using edit.commit();, you should use edit.apply();. Apply will update the preference object instantly and will save the new values asynchronously, so allowing you to read the latest values.

---

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.

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.