SharedPreferences封装工具类

package com.demo.utils;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

import android.content.Context;
import android.content.SharedPreferences;

public class SpUtils
{
  /**
   * 保存在手机里面的文件名
   */
  public static final String FILE_NAME = "share_data";

  /**
   * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
   * 
   * @param context
   * @param key
   * @param object
   */
  public static void put(Context context, String key, Object object)
  {

    SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
        Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();

    if (object instanceof String)
    {
      editor.putString(key, (String) object);
    } else if (object instanceof Integer)
    {
      editor.putInt(key, (Integer) object);
    } else if (object instanceof Boolean)
    {
      editor.putBoolean(key, (Boolean) object);
    } else if (object instanceof Float)
    {
      editor.putFloat(key, (Float) object);
    } else if (object instanceof Long)
    {
      editor.putLong(key, (Long) object);
    } else
    {
      editor.putString(key, object.toString());
    }

    SharedPreferencesCompat.apply(editor);
  }

  /**
   * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
   * 
   * @param context
   * @param key
   * @param defaultObject
   * @return
   */
  public static Object get(Context context, String key, Object defaultObject)
  {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
        Context.MODE_PRIVATE);

    if (defaultObject instanceof String)
    {
      return sp.getString(key, (String) defaultObject);
    } else if (defaultObject instanceof Integer)
    {
      return sp.getInt(key, (Integer) defaultObject);
    } else if (defaultObject instanceof Boolean)
    {
      return sp.getBoolean(key, (Boolean) defaultObject);
    } else if (defaultObject instanceof Float)
    {
      return sp.getFloat(key, (Float) defaultObject);
    } else if (defaultObject instanceof Long)
    {
      return sp.getLong(key, (Long) defaultObject);
    }

    return null;
  }

  /**
   * 移除某个key值已经对应的值
   * @param context
   * @param key
   */
  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);
    SharedPreferencesCompat.apply(editor);
  }

  /**
   * 清除所有数据
   * @param context
   */
  public static void clear(Context context)
  {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
        Context.MODE_PRIVATE);
    SharedPreferences.Editor editor = sp.edit();
    editor.clear();
    SharedPreferencesCompat.apply(editor);
  }

  /**
   * 查询某个key是否已经存在
   * @param context
   * @param key
   * @return
   */
  public static boolean contains(Context context, String key)
  {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
        Context.MODE_PRIVATE);
    return sp.contains(key);
  }

  /**
   * 返回所有的键值对
   * 
   * @param context
   * @return
   */
  public static Map<String, ?> getAll(Context context)
  {
    SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
        Context.MODE_PRIVATE);
    return sp.getAll();
  }

  /**
   * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
   * 
   */
  private static class SharedPreferencesCompat
  {
    private static final Method sApplyMethod = findApplyMethod();

    /**
     * 反射查找apply的方法
     * 
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    private static Method findApplyMethod()
    {
      try
      {
        Class clz = SharedPreferences.Editor.class;
        return clz.getMethod("apply");
      } catch (NoSuchMethodException e)
      {
      }

      return null;
    }

    /**
     * 如果找到则使用apply执行，否则使用commit
     * 
     * @param editor
     */
    public static void apply(SharedPreferences.Editor editor)
    {
      try
      {
        if (sApplyMethod != null)
        {
          sApplyMethod.invoke(editor);
          return;
        }
      } catch (IllegalArgumentException e)
      {
      } catch (IllegalAccessException e)
      {
      } catch (InvocationTargetException e)
      {
      }
      editor.commit();
    }
  }

}