SharedPreferences封装与全局使用

package com.tmeos.xueliang.util;
 
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
 
import android.content.Context;
import android.content.SharedPreferences;
 
/**
 * @author
 * @version 
 */
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
	 * 
	 * @author zhy
	 * 
	 */
	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();
		}
	}
 
}