SharePrefUtil.java

package com.finddreams.baselib.utils;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.apache.commons.codec.binary.Base64;

import android.content.Context;
import android.content.SharedPreferences;
import android.text.TextUtils;

public class SharePrefUtil {
	
		private static String tag = SharePrefUtil.class.getSimpleName();
		private final static String SP_NAME = "config";
		private static SharedPreferences sp;

		/**
		 * 保存布尔值
		 * 
		 * @param context
		 * @param key
		 * @param value
		 */
		public static void saveBoolean(Context context, String key, boolean value) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			    sp.edit().putBoolean(key, value).commit();
		}

		/**
		 * 保存字符串
		 * 
		 * @param context
		 * @param key
		 * @param value
		 */
		public static void saveString(Context context, String key, String value) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			sp.edit().putString(key, value).commit();
			
		}
		
		public static void clear(Context context){
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			sp.edit().clear().commit();
		}

		/**
		 * 保存long型
		 * 
		 * @param context
		 * @param key
		 * @param value
		 */
		public static void saveLong(Context context, String key, long value) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			sp.edit().putLong(key, value).commit();
		}

		/**
		 * 保存int型
		 * 
		 * @param context
		 * @param key
		 * @param value
		 */
		public static void saveInt(Context context, String key, int value) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			sp.edit().putInt(key, value).commit();
		}

		/**
		 * 保存float型
		 * 
		 * @param context
		 * @param key
		 * @param value
		 */
		public static void saveFloat(Context context, String key, float value) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			sp.edit().putFloat(key, value).commit();
		}

		/**
		 * 获取字符值
		 * 
		 * @param context
		 * @param key
		 * @param defValue
		 * @return
		 */
		public static String getString(Context context, String key, String defValue) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			return sp.getString(key, defValue);
		}

		/**
		 * 获取int值
		 * 
		 * @param context
		 * @param key
		 * @param defValue
		 * @return
		 */
		public static int getInt(Context context, String key, int defValue) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			return sp.getInt(key, defValue);
		}

		/**
		 * 获取long值
		 * 
		 * @param context
		 * @param key
		 * @param defValue
		 * @return
		 */
		public static long getLong(Context context, String key, long defValue) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			return sp.getLong(key, defValue);
		}

		/**
		 * 获取float值
		 * 
		 * @param context
		 * @param key
		 * @param defValue
		 * @return
		 */
		public static float getFloat(Context context, String key, float defValue) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			return sp.getFloat(key, defValue);
		}

		/**
		 * 获取布尔值
		 * 
		 * @param context
		 * @param key
		 * @param defValue
		 * @return
		 */
		public static boolean getBoolean(Context context, String key,
				boolean defValue) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			return sp.getBoolean(key, defValue);
		}
		
		/**
		 * 将对象进行base64编码后保存到SharePref中
		 * 
		 * @param context
		 * @param key
		 * @param object
		 */
		public static void saveObj(Context context, String key, Object object) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ObjectOutputStream oos = null;
			try {
				oos = new ObjectOutputStream(baos);
				oos.writeObject(object);
				// 将对象的转为base64码
				String objBase64 = new String(Base64.encodeBase64(baos
						.toByteArray()));

				sp.edit()
						.putString(key,objBase64).commit();
				oos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		/**
		 * 将SharePref中经过base64编码的对象读取出来
		 * 
		 * @param context
		 * @param key
		 * @param defValue
		 * @return
		 */
		public static Object getObj(Context context, String key) {
			if (sp == null)
				sp = context.getSharedPreferences(SP_NAME, 0);
			String objBase64 = sp.getString(key, null);
			if (TextUtils.isEmpty(objBase64))
				return null;

			// 对Base64格式的字符串进行解码
			byte[] base64Bytes = Base64.decodeBase64(objBase64.getBytes());
			ByteArrayInputStream bais = new ByteArrayInputStream(base64Bytes);

			ObjectInputStream ois;
			Object obj = null;
			try {
				ois = new ObjectInputStream(bais);
				obj = (Object) ois.readObject();
				ois.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
			return obj;
		}

	}