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  • SPUtils

    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);
        }
    
    }
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  • 原文地址:https://www.cnblogs.com/yl-saber/p/7099412.html
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