preferences:15500000

class PreferencesUtil { 
  private context = getContext(); 
  private preferences?: dataPreferences.Preferences; 
 
  private initPreferences() { 
    try { 
      let options: dataPreferences.Options = { name: PREFERENCES_NAME }; 
      this.preferences = dataPreferences.getPreferencesSync(this.context, options) 
      console.debug(TAG + `Preferences初始化成功！this.preferences = ` + this.preferences) 
    } catch (err) { 
      console.error(TAG + "Failed to get preferences. code =" + err.code + ", message =" + err.message); 
    } 
  } 
 
  private checkInit() { 
    if (!this.preferences) { 
      console.debug(TAG + `get Preferences尚未初始化！`) 
      this.initPreferences() 
    } 
  } 
 
  put(key: string, value: dataPreferences.ValueType) { 
    this.checkInit() 
 
    try { 
      // 写入数据 
      this.preferences!!.putSync(key, value) 
      // 刷盘 
      this.preferences!!.flush() 
      console.debug(TAG + `保存Preferences[${key} = ${value}]成功`) 
    } catch (e) { 
      console.debug(TAG + `保存Preferences[${key} = ${value}]失败`, JSON.stringify(e)) 
    } 
  } 
 
  get(key: string, defaultValue: dataPreferences.ValueType): dataPreferences.ValueType { 
    this.checkInit() 
 
    try { 
      // 读数据 
      let value = this.preferences!!.getSync(key, defaultValue) 
      console.debug(TAG + `读取Preferences[${key} = ${value}]成功`) 
      return value 
    } catch (e) { 
      console.debug(TAG + `读取Preferences[${key}]失败`, JSON.stringify(e)) 
      return defaultValue 
    } 
  } 
 
  contains(key: string): boolean { 
    return this.preferences!!.hasSync(key); 
  } 
 
  delete(key: string) { 
    this.checkInit() 
 
    this.preferences!!.deleteSync(key) 
    this.preferences!!.flush() 
 
  } 
 
  clear() { 
    this.checkInit() 
 
    this.preferences!!.clearSync() 
    this.preferences!!.flush() 
  } 
}