How to find preferences and setup listeners in UnifiedPreference

DemoUnifiedPreferenceActivity.java

/* 
** Copyright 2012, Joel Pedraza
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

package net.saik0.android.unifiedpreference.demo;

import android.content.Context;
import android.os.Bundle;
import android.preference.EditTextPreference;
import android.preference.Preference;
import android.widget.Toast;

import net.saik0.android.unifiedpreference.demo.R;
import net.saik0.android.unifiedpreference.UnifiedPreferenceFragment;
import net.saik0.android.unifiedpreference.UnifiedSherlockPreferenceActivity;

public class DemoUnifiedPreferenceActivity extends UnifiedSherlockPreferenceActivity {

	@Override public void onCreate(Bundle savedInstanceState) {
		// Set header resource MUST BE CALLED BEFORE super.onCreate 
		setHeaderRes(R.xml.pref_headers);
		// Set desired preference file and mode (optional)
		setSharedPreferencesName("unified_preference_demo");
		setSharedPreferencesMode(Context.MODE_PRIVATE);
		super.onCreate(savedInstanceState);
	}

	private void initGeneralPreferences() {
		EditTextPreference exampleText = (EditTextPreference) findPreference("example_text");
		exampleText.setOnPreferenceClickListener(exampleChangeListener);
	}

	@Override
	@SuppressWarnings("deprecation")
	protected void onPostCreate(Bundle savedInstanceState) {
		super.onPostCreate(savedInstanceState);
		/* 
		 * We must first test if single pane, the lifecycle method is always called whether or not
		 * the Activity is managing the preferences. (The legacy way)
		 */
		if (isSinglePane()) {
			// Set a listener for the activity
			initGeneralPreferences();
		}
	}

	public static class GeneralPreferenceFragment extends UnifiedPreferenceFragment {
		@Override
		public void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			// Set a listener for a fragment
			initGeneralPreferences();
		}
		
	}

	public static class NotificationPreferenceFragment extends UnifiedPreferenceFragment {
		// This fragment does not contain the example_text preference, so we do nothing.
	}

	public static class DataSyncPreferenceFragment extends UnifiedPreferenceFragment {}

	/** 
	 * A sample listener that shows the key of the Preference that was clicked. It does not consume the click event.
	 */
	private static Preference.OnPreferenceClickListener exampleChangeListener = new Preference.OnPreferenceClickListener() {
		@Override
		public boolean onPreferenceClick(Preference preference) {
			Toast.makeText(preference.getContext(), preference.getKey() + " clicked", Toast.LENGTH_SHORT).show();
			return false;
		}
	};
}

I tried this .. But, i never get any notification nor any error .. What have i done wrong here ?

Thanks in Advance !

package com.njlabs.example;

import net.saik0.android.unifiedpreference.UnifiedPreferenceFragment;
import net.saik0.android.unifiedpreference.UnifiedSherlockPreferenceActivity;

import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.view.MenuItem;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.Preference;
import android.widget.Toast;

/**
 * @author Niranjan
 */
public class preferences extends UnifiedSherlockPreferenceActivity implements OnSharedPreferenceChangeListener  {

    @Override public void onCreate(Bundle savedInstanceState) {
        // Set header resource MUST BE CALLED BEFORE super.onCreate 
        setHeaderRes(R.xml.pref_headers);
        // Set desired preference file and mode (optional)
        setSharedPreferencesName("preferences");
        setSharedPreferencesMode(Context.MODE_PRIVATE);
        super.onCreate(savedInstanceState);

        ActionBar actionBar = getSupportActionBar();
        actionBar.setDisplayHomeAsUpEnabled(true);

    }

    public static class PersonalDetailsFragment extends UnifiedPreferenceFragment {}

    public static class AmritaExplorerFragment extends UnifiedPreferenceFragment {}

    public static class LibrariesFragment extends UnifiedPreferenceFragment {        
        /** 
         * A sample listener that shows the key of the Preference that was clicked. It does not consume the click event.
         */
        private static Preference.OnPreferenceClickListener exampleChangeListener = new Preference.OnPreferenceClickListener() {
            @Override
            public boolean onPreferenceClick(Preference preference) {
                Toast.makeText(preference.getContext(), preference.getKey() + " clicked", Toast.LENGTH_SHORT).show();
                return false;
            }
        };      
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
            case android.R.id.home:
                // app icon in action bar clicked; go home
                finish();
                overridePendingTransition(R.anim.push_up_in, R.anim.push_up_out);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }
    public void onBackPressed() {
        super.onBackPressed();
        overridePendingTransition(R.anim.push_up_in, R.anim.push_up_out);
    }
    @Override
    public void onSharedPreferenceChanged(SharedPreferences arg0, String arg1) {
        // TODO Auto-generated method stub

    }
}