SPUtils SharedPreferences工具類

SharedPreferences工具類，作為存儲和獲取data下相關文件工具類，對SharedPreferences進行封裝，使其使用更簡單。

    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");  
    }  

    /** 
     * 保存在手機里面的文件名 
     */  
    public static final String FILE_NAME = "share_data";  

    /** 
     * 保存數據的方法，我們需要拿到保存數據的具體類型，然后根據類型調用不同的保存方法 
     *  
     * @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);  
    }  

    /** 
     * 得到保存數據的方法，我們根據默認值得到保存的數據的具體類型，然后調用相對于的方法獲取值 
     *  
     * @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;  
    }  

    /** 
     * 移除某個key值已經對應的值 
     *  
     * @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);  
    }  

    /** 
     * 清除所有數據 
     *  
     * @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);  
    }  

    /** 
     * 查詢某個key是否已經存在 
     *  
     * @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);  
    }  

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

    /** 
     * 創建一個解決SharedPreferencesCompat.apply方法的一個兼容類 
     *  
     * @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;  
        }  

        /** 
         * 如果找到則使用apply執行，否則使用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();  
        }  
    }  

}  </pre>