SharedPreference工具类：

本文主要是介绍SharedPreference工具类：，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

每次都要自行实例化SP相关的类，肯定很麻烦，这里贴个SP的工具类，大家可以贴到自己的项目中。

SPUtils.java

package com.jay.sharedpreferencedemo3;import android.content.Context;
import android.content.SharedPreferences;import java.util.Map;/*** Created by Jay on 2015/9/2 0002.*/
public class SPUtils {/*** 保存在手机里的SP文件名*/public static final String FILE_NAME = "my_sp";/*** 保存数据*/public static void put(Context context, String key, Object obj) {SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);SharedPreferences.Editor editor = sp.edit();if (obj instanceof Boolean) {editor.putBoolean(key, (Boolean) obj);} else if (obj instanceof Float) {editor.putFloat(key, (Float) obj);} else if (obj instanceof Integer) {editor.putInt(key, (Integer) obj);} else if (obj instanceof Long) {editor.putLong(key, (Long) obj);} else {editor.putString(key, (String) obj);}editor.commit();}/*** 获取指定数据*/public static Object get(Context context, String key, Object defaultObj) {SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);if (defaultObj instanceof Boolean) {return sp.getBoolean(key, (Boolean) defaultObj);} else if (defaultObj instanceof Float) {return sp.getFloat(key, (Float) defaultObj);} else if (defaultObj instanceof Integer) {return sp.getInt(key, (Integer) defaultObj);} else if (defaultObj instanceof Long) {return sp.getLong(key, (Long) defaultObj);} else if (defaultObj instanceof String) {return sp.getString(key, (String) defaultObj);}return null;}/*** 删除指定数据*/public static void remove(Context context, String key) {SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);SharedPreferences.Editor editor = sp.edit();editor.remove(key);editor.commit();}/*** 返回所有键值对*/public static Map<String, ?> getAll(Context context) {SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);Map<String, ?> map = sp.getAll();return map;}/*** 删除所有数据*/public static void clear(Context context) {SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);SharedPreferences.Editor editor = sp.edit();editor.clear();editor.commit();}/*** 检查key对应的数据是否存在*/public static boolean contains(Context context, String key) {SharedPreferences sp = context.getSharedPreferences(FILE_NAME, context.MODE_PRIVATE);return sp.contains(key);}}

文章参考于：http://www.runoob.com/w3cnote/android-tutorial-sharedpreferences.html

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