线程安全的SharedpreferenceUtil

package com.xinchuang.buynow.utility;
import android.content.Context;
import android.content.SharedPreferences;

/**
 * SP工具类
 */
public class PreferenceManager {
   public static final String PREFERENCE_NAME = "saveInfo";
   private static SharedPreferences mSharedPreferences;
   private static PreferenceManager mPreferencemManager;
   private static SharedPreferences.Editor editor;
   
   private PreferenceManager(Context cxt) {
      mSharedPreferences = cxt.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
      editor = mSharedPreferences.edit();
   }

   public static synchronized void init(Context cxt){
       if(mPreferencemManager == null){
           mPreferencemManager = new PreferenceManager(cxt);
       }
   }

   /**
    * 单例模式，获取instance实例
    * 
    * @return
    */
   public synchronized static PreferenceManager getInstance() {
      if (mPreferencemManager == null) {
         throw new RuntimeException("please init first!");
      }
      
      return mPreferencemManager;
   }
   final public void saveData(String key , String value){
      editor.putString(key, value).commit();
   }
   
    final public void saveData(String key , int value){
      editor.putInt(key, value).commit();
   }
   
    final public void saveData(String key , boolean value){
      editor.putBoolean(key, value).commit();
   }
   
    final public void saveData(String key , float value){
      editor.putFloat(key, value).commit();
   }
    
    final public void saveData(String key , long value){
      editor.putLong(key, value).commit();
   }
   
    final public String getSaveStringData(String key , String defaultValue){
      return mSharedPreferences.getString(key, defaultValue);
   } 
   
    final public int getSaveIntData(String key,int defaultValue){
      return mSharedPreferences.getInt(key, defaultValue);
   } 
   
    final public boolean getSaveBooleanData(String key,boolean defaultValue){
      return mSharedPreferences.getBoolean(key, defaultValue);
   } 
   
    final public float getSaveFloatData(String key,float defaultValue){
      return mSharedPreferences.getFloat(key, defaultValue);
   } 
    
    final public long getSaveLongData(String key,long defaultValue){
      return mSharedPreferences.getLong(key, defaultValue);
   } 
    final public void cleatData(){
      editor.clear().commit();
   }

}