<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:orientation="vertical" 
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent"> 
  <TextView 
    android:id="@+id/textView" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:gravity="center_horizontal" 
    android:textColor="#FF0000"/> 
</LinearLayout> 

package com.scott.prefs; 
 
import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.content.SharedPreferences; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.widget.TextView; 
 
public class MainActivity extends Activity { 
 
  private static final int SETTINGS_ID = 0; 
  private static final int EXIT_ID = 1; 
 
  private TextView textView; 
 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    textView = (TextView) findViewById(R.id.textView); 
    showSettings(); 
  } 
 
  @Override 
  public boolean onCreateOptionsMenu(Menu menu) { 
    super.onCreateOptionsMenu(menu); 
    menu.add(0, SETTINGS_ID, 0, "Settings"); 
    menu.add(0, EXIT_ID, 0, "Quit"); 
    return true; 
  } 
 
  @Override 
  public boolean onOptionsItemSelected(MenuItem item) { 
    if (item.getItemId() == SETTINGS_ID) { 
      Intent intent = new Intent(MainActivity.this, PrefsActivity.class); 
      //如果requestCode >= 0 则返回结果时会回调 onActivityResult()方法 
      startActivityForResult(intent, 1); 
    } else { 
      finish(); 
    } 
    return true; 
  } 
 
  @Override 
  protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    showSettings(); 
  } 
 
  private void showSettings() { 
    String prefsName = getPackageName() + "_preferences";  //[PACKAGE_NAME]_preferences 
    SharedPreferences prefs = getSharedPreferences(prefsName, Context.MODE_PRIVATE); 
 
    String nickName = prefs.getString("nickName", "机器人"); 
    textView.setText("欢迎您：" + nickName); 
 
    boolean nightMode = prefs.getBoolean("nightMode", false); 
    textView.setBackgroundColor(nightMode ? Color.BLACK : Color.WHITE); 
 
    String textSize = prefs.getString("textSize", "0"); 
    if (textSize.equals("0")) { 
      textView.setTextSize(18f); 
    } else if (textSize.equals("1")) { 
      textView.setTextSize(22f); 
    } else if (textSize.equals("2")) { 
      textView.setTextSize(36f); 
    } 
  } 
} 

<?xml version="1.0" encoding="utf-8"?> 
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" 
  android:key="settings" 
  android:title="软件设置"> 
  <PreferenceCategory 
    android:key="basic" 
    android:title="基本设置"> 
    <EditTextPreference 
      android:key="nickName" 
      android:title="昵称" 
      android:defaultValue="机器人"/> 
    <CheckBoxPreference 
      android:key="nightMode" 
      android:title="夜间模式" 
      android:summaryOn="已启用" 
      android:summaryOff="未启用"/> 
    <ListPreference 
      android:key="textSize" 
      android:title="文字大小" 
      android:dialogTitle="文字大小" 
      android:entries="@array/textSize_entry" 
      android:entryValues="@array/textSize_entry_value" 
      android:defaultValue="0"/> 
  </PreferenceCategory> 
  <PreferenceCategory 
    android:key="clean" 
    android:title="清除记录"> 
    <Preference  
      android:key="cleanHistory" 
      android:title="清除历史记录" />   
  </PreferenceCategory> 
</PreferenceScreen> 

<?xml version="1.0" encoding="utf-8"?> 
<resources> 
  <string-array name="textSize_entry"> 
    <item>小</item> 
    <item>中</item> 
    <item>大</item> 
  </string-array> 
  <string-array name="textSize_entry_value"> 
    <item>0</item> 
    <item>1</item> 
    <item>2</item> 
  </string-array> 
</resources> 

package com.scott.prefs; 
 
import android.app.AlertDialog; 
import android.content.DialogInterface; 
import android.os.Bundle; 
import android.preference.EditTextPreference; 
import android.preference.ListPreference; 
import android.preference.Preference; 
import android.preference.PreferenceActivity; 
import android.preference.PreferenceScreen; 
import android.widget.Toast; 
 
public class PrefsActivity extends PreferenceActivity implements Preference.OnPreferenceChangeListener { 
 
  private EditTextPreference nickName; 
  private ListPreference textSize; 
  private Preference cleanHistory; 
 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    addPreferencesFromResource(R.xml.setttings); 
    nickName = (EditTextPreference) findPreference("nickName"); 
    textSize = (ListPreference) findPreference("textSize"); 
    cleanHistory = findPreference("cleanHistory"); 
 
    //为nickName和textSize注册Preference.OnPreferenceChangeListener监听事件 
    //当值更改时我们可以立即更新summary 
    nickName.setOnPreferenceChangeListener(this); 
    textSize.setOnPreferenceChangeListener(this); 
 
    initSummary(); 
  } 
 
  //初始化summary 
  private void initSummary() { 
    nickName.setSummary(nickName.getText()); 
 
    setTextSizeSummary(textSize.getValue()); 
  } 
 
  private void setTextSizeSummary(String textSizeValue) { 
    if (textSizeValue.equals("0")) { 
      textSize.setSummary("小"); 
    } else if (textSizeValue.equals("1")) { 
      textSize.setSummary("中"); 
    } else if (textSizeValue.equals("2")) { 
      textSize.setSummary("大"); 
    } 
  } 
 
  /** 
   * 重写PreferenceActivity的onPreferenceTreeClick方法 
   * 在首选项被点击时 做出相应处理操作 
   */ 
  @Override 
  public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) { 
    if (preference == cleanHistory) { 
      new AlertDialog.Builder(this) 
          .setTitle("清除历史记录") 
          .setMessage("是否真的要清除历史记录？") 
          .setPositiveButton("是", new DialogInterface.OnClickListener() { 
            @Override 
            public void onClick(DialogInterface dialog, int which) { 
              //cleaning history... 
              Toast.makeText(PrefsActivity.this, "清除成功", Toast.LENGTH_SHORT).show(); 
            } 
          }).setNegativeButton("否", new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface dialog, int which) { 
          dialog.dismiss(); 
        } 
      }).create().show(); 
    } 
    return true; 
  } 
 
  /** 
   * 重写Preference.OnPreferenceChangeListener的onPreferenceChange方法 
   * 当首选项的值更改时 做出相应处理操作 
   */ 
  @Override 
  public boolean onPreferenceChange(Preference preference, Object newValue) { 
    if (preference == nickName) { 
      nickName.setSummary(newValue.toString()); 
    } else if (preference == textSize) { 
      setTextSizeSummary(newValue.toString()); 
    } 
    return true; 
  } 
} 

<activity android:name=".PrefsActivity"/> 

<?xml version='1.0' encoding='utf-8' standalone='yes' ?> 
<map> 
  <boolean name="nightMode" value="true" /> 
  <string name="nickName">scott</string> 
  <string name="textSize">2</string> 
</map>