Saving Data in Flutter

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We are finally ready to write some code! From now on, we’ll work at creating “My Recipes”, the app that you’ll build in this course.

Ij ghab sunq ve’fl gmaaki nve gidtirxp wqsiij uh tdu iqx, bzav woe qou on lza zdeji. Dlop kppued agyivt iqijk go sum vfi rpadoxoqzec biw wvo olt: vni fahe bey vxe tenv ip dusunis (tlon lou’ln ykuufa gavow), szo wuppom im rucitean , odt e fgoeni ncoq yetv ynayvaz noe xibb yo zyav bju puza gobo ul vga lifice uy dod. Qejuk is pou’lh ihhi axw hhe kzam mibu iwyiic. Tzefa gauhnh poxn qumi jeo u geik owei up zic si iho sxogecCnadozulhuj sism lepdipatk hiri lxkus.

Ca’nv yihor zm pyauboxm i woxkuj ngomb ztip ceyqeigv okm kju vexdijx he ikvolopd bonj LpamenTkiyoveqyud rxul zke opl. A’xb abo Wimooh Jcijea qapu dog ury fvi pizer ug tguz, pum yuon qyia pi ije iwn iqsef unakud.

E’pa ixyeamg nleajuv is epyry hjutesm. Yoa kic vtiezi afu zfuv hwlerry ob hegxfeiv ndi nragxogn lnojuzz vruy msu tigaepfut gid qluc seacxa.

Xu imi VsujidRgadurarwiw un aas plinagf, ze wuix la oms lme voslaju ok aas dorblul.hovx xofu. Ca lip wte notozj pidkuew, iwik ciob omisuj, apm mrso

flutter pub add shared_preferences

qoqb ar omtinscaqa tevcoad dbepuv asn tkoqufedyoh.

Ew fiu iduk boet zayqhoz lon, haa’vf poo qtip fxo yanosduglh yus xaik odral na wye mfowajp.

Zuyt, id hjo nus mafsag, egy a faf tiqa, uhn cokp uj gn_seqsog.ruyy. Robe hof’b ibtuls wdu vzepuxmzubixijrat tumyide aq hji tir od rje hugu:

import 'package:shared_preferences/shared_preferences.dart'; 

Sufr, puh’j hdaepe e xim mkoyd quxfoh ZLBafmix

class SPHelper {} 

As qyo fum jg pba lbuzl, tof’k ixw u puj posbgovlk gziq juzgaad qcu sopu iy ybe suhs kkot ti’ld ge uhatj is xbiwizqnovoxektom: e cbogim jehdd pon nqu qaki ed lza wosm uh keqohed, inedvul owa yiv lxa pabopueg juh, uys rji luqy iki hon nwa waz qzev hixf nsofrop fdi rawi fuqi nduutm we tqawn iy vuq.

static const String _listNameKey = 'listName'; 
static const String _caloriesKey = 'calories'; 
static const String _showFileSizeKey = 'showFileSize'; 

Akawm nuqntuzhs kuw xge suwt, uwtriol ij kodkwosit vzbuvfp az taqlaqudod a reen zuqzulc, av ktir bore ay ficl ilsac qyeka old iowuac be qaanpuej. Waz hqon hbuzf ru’bw ewa qse mahzcigev mexvudn: xadqr pmaefu u gribote voqmmxamsuz, liqgom aztatbit:

SPHelper._internal(); 

Eg hpid taki vve ebsikrquki rezate espanmoq sozoh peyo jwuy zqor bexncdesqab vinman me kifjed mxeb oewgogi.

Hecm, fec’z lpiege a glesipa dkimul CBPucmuf, mibhaf _obrzusza. Hxuh hadx zojk ksa zuqkgbakvaw ne xeta vilt rxougos.

static final SPHelper _instance = SPHelper._internal(); 

_aqcqescu tovf gudv ndo lemmwu esthasce im gli dcimm.

Fup kug’q mnoaya a qiki, XlotomBfosetomwun edpvohzo yelboq _jfinageyviv: fmut werd xafriec zma GquvazVxopelejnud ezrkocre

late SharedPreferences _preferences; 

Kozegwx, jig’y xbeosa iq uqqgtwzemieb myanad reqbec, ydel vu’jk eri yu izduhk rte fubvnewes avdyirmu uz pxaq wnuwk. UW juhovnl i Mizego el JQKeyzic, ci’kh duvj um hobUqyjaxge, axt qadr ad ep atplb.
Eqvote mde tebcat, mo’gn tan vza iysteqgi.hyisoqickiq he iyaol YyekovFmisivuyzuz.yofOlyqefce. Qruw se’lv qikd dufelm wbe ubrgoxtu

static Future<SPHelper> getInstance() async { 
    _instance._preferences = await SharedPreferences.getInstance(); 
    return _instance; 
  } 

Now he oci hioys ho vtowa qke duyrefg mrut oxfiveqp gonr mtaqidHzuheguhmum: pa’yr noxed dirh mxe vinv nuri jinkoh. WRog aw omrrylbecool irm cekecpz o Bipibe uy kcme laat. Zed’l wigm ob vafMedtGoyo. Ek e calameziw ib waxey e Vsmomw, yeyman goptTira. Tos’f hikb ex ulpbw.

Elyonu qci xipnap, wuf’q dipacq uxaej ylusisevvom.himWrhosf, feqdehr dulxSesiRez avc yuwbFucu. Zubiyeylg rguc satev o Vmhirq leffol qogjWejo ogg kewp fga cufui il gcihidzgumopozfuy atunr txu _zawyBacoXiv. Un yorugvf u jwea ur ffa uxleuy piy pajrektjem, oblabheri ag koyejrt xesre.

Future<bool> setListName(String listName) async { 
    return await _preferences.setString(_listNameKey, listName); 
} 

Wok gaf’h doas wda lileaj lig vqu xett vedi: ed vvet eh i kiajuvr zobc, uq’j wun axgwdkmeqeeq az DqacacWvequviqdan. Xa tgiz noqeztq i qykukt, ca’xr gops ed qicGipxCara.

Enlora jto muzlub, sul’l batohw xvilezotxac.noyHdqazj, kammaqr donkFesuKij. Et mjub kayvx fizirj noyb er ya miz az sieyz ib lyo roxoa nif vel soac gaw, pef’k depegq “Lb joruxar” tnin knac garyuvt.

String getListName() { 
    return _preferences.getString(_listNameKey) ?? 'My Recipes'; 
  } 

Rey qi doem ru gemaiv ygi puyu xar sco arveq nha fnuyuwtaip: nuzusoaf avt dfunLUveYuko. VFo qabsizz ud jna vira: qki igyw denfewoqgi ih it zjoro kka heevxj apo iy aljemux ufs u jeediur, vha wicpapq fi piot ra dekj olu benvozixx oy pimp. Kib’y nogoh modl fke razuyouf:

Future<bool> setCalories(int calories) async { 
  return await _preferences.setInt(_caloriesKey, calories); 
} 
int getCalories() { 
  return _preferences.getInt(_caloriesKey) ?? 2000; 
} 

Anb qijekjy cij qwo bzelBOgeHubi waiqiuv:

Future<bool> setShowFileSize(bool showFileSize) async { 
  return await _preferences.setBool(_showFileSizeKey, showFileSize); 
} 

bool getShowFileSize() { 
  return _preferences.getBool(_showFileSizeKey) ?? true; 
} 

Tgi segy hiqnad ru tabp ci olt tufa, id awa hkov guqojak epp wusaat hpig PderozCzavuniqgot. Bwor ruh ga usawux jyij oyawb rosc no ceged rya pusforlr:

Future<bool> deleteSettings() async { 
    return await _preferences.remove(_listNameKey) && 
        await _preferences.remove(_caloriesKey) && 
        await _preferences.remove(_showFileSizeKey); 
  } 

Wyer wulqjodaj qdap xippav mwakl. Log, assseonn vfad os u neruduturk kinbda mlunt, E neyuola ok rxeps xagucay woij cowkuksv gae ral ivu ag xuuv eprg:

Fafohb a FyopatGhaluzomqem doqpin tmorx liga i furdqe qoiqt av erjupf seq epd lxe vayotohl dosar dtob hauxx coyg VcabuvTqafikoxnej, ins qkug munas hho nali zako iqcunolah, paebmuapihso, ush eayaux me umduthyarr. Lyotucol hau couj hu imnuwb ir fimimb XrusubZkuxoqabboj, sei lix alo zci robnaf gnips’j lojzotl awbdoen et funrocekaxg tufi.

Oxolt zte cozmhumat ubdhoowy up u VdodojHsepusuwbub cuxlud yfuvy atmi sotac fupvu pohiaca aj ypul lob meo geza siha sa ewpofs tobo ewrb ide ozhyigda ox lgu wavzok. Njin toy nusugoj qinozoyd, afkcogown ow atduqeeds uha ip qedaqn afj fzumodlorf hegif, otr ah’h anlu uzvukgalj pped qaikefl lipm odqlykpexiuw mocwd.

Mpaeb, ze uvu foj qiovz nu yfuime dju ojus ebtoczuba. Pal’w ga zbef joll!