Notify other activity of a preference changed

Question

I'm trying to have the main activity notified of a change in preferences in the PreferenceActivity but the onSharedPreferenceChanged is not firing when I change the preference.

    SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
    prefs.registerOnSharedPreferenceChangeListener(new OnSharedPreferenceChangeListener()
    {   
        public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key)
        {
            Log.d("Dict", "PreferenceChanged: " + key);
        }
    });

Answer 1

My guess is (because it's a common mistake) that you are registering the listener in onResume() and unregister it in onPause(). That will prevent the listener from firing. If that's what's happening, changing your code to register during onCreate() and unregister during onDestroy() will fix the problem.

Answer 2

You can use this code Find the what Preference current value change according to his key

public class SharedPreferences implements OnSharedPreferenceChangeListener {

@Override
public void onSharedPreferenceChanged(
        android.content.SharedPreferences sharedPreferences, String key) {
    // TODO Auto-generated method stub

    sharedPreferences.getBoolean(key, defValue);
    sharedPreferences.getFloat(key,defValue);
    sharedPreferences.getInt(key, defValue);
    sharedPreferences.getString(key, defValue);
    sharedPreferences.getString(key, defValue);
}

}