安卓工具类->SharedPreferences

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{	public SPUtils()	{		/* cannot be instantiated */		throw new UnsupportedOperationException("cannot be instantiated");	}	/**	 * 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();		}	}}