private void savedata()
        {
            SQLiteConnection dbconn = new SQLiteConnection(App.settingpath);

            dbconn.CreateTable <settingsdata>();

            settingsdata settinginfo = new settingsdata()
            {
                height    = toheightunit(Heightset.Detail),
                weight    = toweightunit(Weightset.Detail),
                bp        = tobpunit(Bpset.Detail),
                _temp     = totempunit(Tpset.Detail),
                alerttime = timeofalert.Time,
                walert    = weatheroption.On,
                oalert    = otheroption.On,
                language  = tolang(Lang.Detail)
            };

            try
            {
                dbconn.DeleteAll <settingsdata>();
            }
            catch (Exception) { }
            dbconn.Insert(settinginfo);
            dbconn.Dispose();
        }
        private void setcontent()
        {
            SQLiteConnection dbconn = new SQLiteConnection(App.settingpath);

            try
            {
                settingsdata settinginfo = dbconn.Table <settingsdata>().ToList().First();
                lang             = settinginfo.language;
                Weightset.Detail = fromweightunit(settinginfo.weight);
                Heightset.Detail = fromheightunit(settinginfo.height);
                Bpset.Detail     = frombpunit(settinginfo.bp);
                Tpset.Detail     = fromtempunit(settinginfo._temp);
                timeofalert.Time = settinginfo.alerttime;
                weatheroption.On = settinginfo.walert;
                otheroption.On   = settinginfo.oalert;
                Lang.Detail      = fromlang(settinginfo.language);
                var k = (int)lang;


                measurementsection.Title = new string[] { "Unit of measurement", "量度單位", "量度單位" }[k];
                Weightset.Text           = new string[] { "Weight", "體重", "体重" }[k];
                Heightset.Text           = new string[] { "Height", "身高", "身高" }[k];
                Bpset.Text         = new string[] { "Blood pressure", "血壓", "血压" }[k];
                Tpset.Text         = new string[] { "Temperature", "溫度", "温度" }[k];
                Lang.Text          = new string[] { "Language", "語言", "语言" }[k];
                notifsection.Title = new string[] { "Notification", "通知", "通知" }[k];

                weatheroption.Text = new string[] { "Weather alerts", "顯示天氣", "显示天气" }[k];
                otheroption.Text   = new string[] { "Other alerts", "顯示其他通知", "显示其他通知" }[k];
                toatitle.Text      = new string[] { "Time of alert", "通知時間", "通知时间" }[k];
                toadetail.Text     = new string[] { "When do you want to receive alerts about your health?", "接收天氣通知的時間", "接收天气通知的时间" }[k];

                Title       = new string[] { "Preferences", "設定", "设定" }[k];
                btnext.Text = new string[] { "Next", "下一步", "下一步" }[k];
            }
            catch (Exception) { }
            base.OnAppearing();
        }