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//1.
package course.examples.DataManagement.PreferenceActivity;

import android.app.Activity;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.os.Bundle;
import android.preference.Preference;
import android.preference.PreferenceFragment;

public class ViewAndUpdatePreferencesActivity extends Activity {

	private static final String USERNAME = "uname";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.user_prefs_fragment);

	}

	// Fragment that displays the username preference
	public static class UserPreferenceFragment extends PreferenceFragment {

		protected static final String TAG = "UserPrefsFragment";
		private OnSharedPreferenceChangeListener mListener;
		private Preference mUserNamePreference;

		@Override
		public void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);

			// Load the preferences from an XML resource
			addPreferencesFromResource(R.xml.user_prefs);

			// Get the username Preference
			mUserNamePreference = (Preference) getPreferenceManager()
					.findPreference(USERNAME);

			// Attach a listener to update summary when username changes
			mListener = new OnSharedPreferenceChangeListener() {
				@Override
				public void onSharedPreferenceChanged(
						SharedPreferences sharedPreferences, String key) {
					mUserNamePreference.setSummary(sharedPreferences.getString(
							USERNAME, "None Set"));
				}
			};

			// Get SharedPreferences object managed by the PreferenceManager for
			// this Fragment
			SharedPreferences prefs = getPreferenceManager()
					.getSharedPreferences();

			// Register a listener on the SharedPreferences object
			prefs.registerOnSharedPreferenceChangeListener(mListener);

			// Invoke callback manually to display the current username
			mListener.onSharedPreferenceChanged(prefs, USERNAME);

		}

	}
}
==================================================================
//2.
package course.examples.DataManagement.PreferenceActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class PreferencesActivityExample extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		// Open a User Preferences Entry Activity 
		final Button button = (Button) findViewById(R.id.check_pref_button);
		button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				startActivity(new Intent(
						PreferencesActivityExample.this,
						ViewAndUpdatePreferencesActivity.class));
			}
		});

	}
}
=====================================================================
//3.  
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="course.examples.DataManagement.PreferenceActivity"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="false"
        android:icon="@drawable/icon"
        android:label="@string/app_name" >
        <activity
            android:name=".PreferencesActivityExample"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".ViewAndUpdatePreferencesActivity" >
        </activity>
    </application>

</manifest>