Android中信息保存有三种方法:
1 SharePreferences 2 文件保存 3 数据库存储
但现在个人还没找到 他们中每个有什么特殊的的用途,好像东西用他们每一个都能存储,也都能持久存储
有高手略过欢迎给予指点,多谢。
/** * 应用程序配置类:用于保存用户相关信息及设置 * 用属性文件来保存一些基本信息 * 类设计为单例,Android,一UI线程为主,个人觉得不涉及到线程安全问题 */ @SuppressLint("NewApi") public class AppConfig { private final static String APP_CONFIG = "config"; public final static String CONF_LOAD_IMAGE = "perf_loadimage"; public final static String SAVE_IMAGE_PATH = "save_image_path"; @SuppressLint("NewApi") public final static String DEFAULT_SAVE_IMAGE_PATH = Environment.getExternalStorageDirectory()+ File.separator+ "包名"+ File.separator; private Context mContext; private static AppConfig appConfig; public static AppConfig getAppConfig(Context context) { if (appConfig == null) { appConfig = new AppConfig(); appConfig.mContext = context; } return appConfig; } /** * 获取Preference设置 */ public static SharedPreferences getSharedPreferences(Context context) { return PreferenceManager.getDefaultSharedPreferences(context); } /** * 是否加载显示文章图片 */ public static boolean isLoadImage(Context context) { return getSharedPreferences(context).getBoolean(CONF_LOAD_IMAGE, true); } public String get(String key) { Properties props = get(); return (props != null) ? props.getProperty(key) : null; } public Properties get() { FileInputStream fis = null; Properties props = new Properties(); try { // 读取files目录下的config // fis = activity.openFileInput(APP_CONFIG); // 读取app_config目录下的config File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE); fis = new FileInputStream(dirConf.getPath() + File.separator + APP_CONFIG); Log.i("OSChina", dirConf.getPath() ) ; props.load(fis); } catch (Exception e) { } finally { try { fis.close(); } catch (Exception e) { } } return props; } private void setProps(Properties p) { FileOutputStream fos = null; try { // 把config建在files目录下 // fos = activity.openFileOutput(APP_CONFIG, Context.MODE_PRIVATE); // 把config建在(自定义)app_config的目录下 File dirConf = mContext.getDir(APP_CONFIG, Context.MODE_PRIVATE); File conf = new File(dirConf, APP_CONFIG); fos = new FileOutputStream(conf); p.store(fos, null); fos.flush(); } catch (Exception e) { e.printStackTrace(); } finally { try { fos.close(); } catch (Exception e) { } } } public void set(Properties ps) { Properties props = get(); props.putAll(ps); setProps(props); } public void set(String key, String value) { Properties props = get(); props.setProperty(key, value); setProps(props); } public void remove(String... key) { Properties props = get(); for (String k : key) props.remove(k); setProps(props); } }