I-savedInstanceState iyireferensi yento yenqwaba edluliselwa endleleni ye-onCreate yawo wonke umsebenzi we-Android. Imisebenzi inamandla, ngaphansi kwezimo ezikhethekile, ukuzibuyisela esimweni sangaphambilini isebenzisa idatha egcinwe kule nqwaba.
Kuyini ukusetshenziswa kwe-onSaveInstanceState ku-Android?
Indlela ye-onSaveInstanceState() ikuvumela ukuthi ungeze amapheya okhiye/inani ngaphandle kweSifunda sohlelo lokusebenza. Bese indlela ye-onRestoreInstanceState() izokuvumela ukuthi ubuyise inani futhi ulibuyisele kokuguquguqukayo lapho liqoqwe khona ekuqaleni.
Usilondoloza kanjani isimo socezu?
Izinhlobo zezifunda ezishiwo kuthebula zimi kanje:
- Okuguquguqukayo: okuguquguqukayo kwendawo kucezu.
- Buka Isimo: noma iyiphi idatha ephethwe ukubukwa okukodwa noma ngaphezulu esiqeshini.
- I-SavedState: idatha ekhona kulesi senzakalo sesiqephu okufanele ilondolozwe ku-onSaveInstanceState() .
30 uNovemba. UDisemba 2020
Ngiyisebenzisa kanjani i-OnStart ku-Android?
i-onStart ()
- Uma umsebenzi uqala ukubonakala kumsebenzisi kuzothiwa onStart() uzobizwa.
- Lokhu kushaya ngemuva nje kokuthi i-onCreate() yethulwe okokuqala ngqa.
- Lapho umsebenzi wethulwa, qala u-onCreate() indlela yokushaya ucingo bese u- onStart() bese u- onResume().
- Uma umsebenzi uku-onPause() isimo okungukuthi asibonakali kumsebenzisi.
Iyini ukusetshenziswa kwendlela ye-onCreate ku-Android?
onCreate(savedInstanceState); ishayela indlela ku-superclass kanye ne-InstanceState egciniwe yomsebenzi uma kukhona into elimaza umsebenzi ukuze ilondolozwe ku-emosstateState ukuze uma ulayisha kabusha umsebenzi uzofana ngaphambili.
Yini i-bundle class ku-Android?
I-Android Bundle isetshenziselwa ukudlulisa idatha phakathi kwemisebenzi. Amanani azodluliswa afakwe kumephu kokuthi String keys ezisetshenziswa kamuva emsebenzini olandelayo ukuze kutholwe amanani. Okulandelayo yizinhlobo ezinkulu ezidluliswayo/ezibuyiswa ku/kusuka kunqwaba.
Uma indlela ye-OnPause ibizwa nge-Android?
Misa. Ibizwa lapho Umsebenzi usabonakala kancane, kodwa umsebenzisi cishe uzulazula eshiya Umsebenzi wakho ngokuphelele (lapho i-OnStop izobizwa ngokulandelayo). Isibonelo, uma umsebenzisi echofoza inkinobho ethi Ikhaya, isistimu ibiza okuthi Misa futhi okuthi Misa ngokulandelana okusheshayo kokuthi Umsebenzi wakho .
Ulwakha kanjani ucezu?
Ukuze udale Ucezu olungenalutho , nweba uhlelo lokusebenza > i-java kuphrojekthi: Buka i-Android, khetha ifolda equkethe ikhodi ye-Java yohlelo lwakho lokusebenza, bese ukhetha Ifayela > Okusha > Ucezu > Ucezu (Akunalutho).
Siyini isimo se-fragment?
I-Fragment imele ingxenye engasetshenziswa kabusha ye-UI yohlelo lwakho lokusebenza. Isiqeshana sichaza futhi silawule isakhiwo saso, sinomjikelezo waso wempilo, futhi singasingatha imicimbi yaso yokokufaka. Izingcezu azikwazi ukuphila ngokwazo–kumele zisingathwe umsebenzi noma esinye isiqephu.
Ngiyilondoloza kanjani idatha yami egciniwe ye-InstanceState?
Le ndlela ibizwa nge-onStart().
onSaveInstanceState(savedInstanceState); // Buyisela isimo se-UI usebenzisa i-savedInstanceState. Usebenzisa le ndlela ungagcina zonke izifunda kanye nokunye okuguquguqukayo kwedatha okungalahleka ekuzungezisweni kwesikrini noma uma umsebenzi wamanje ungena ngemuva.
Iyini indlela ye-onStart ku-Android?
onStart(): Le ndlela ibizwa lapho umsebenzi ubonakala kumsebenzisi futhi ubizwa ngemuva kokuthi onCreate. onResume(): Ibizwa ngaphambi nje kokuthi umsebenzisi aqale ukusebenzisana nohlelo lokusebenza. … onDestroy(): Kubizwa uma umsebenzi ususuliwe kusitaki sohlelo lokusebenza.
Uwubulala kanjani umsebenzi?
Yethula uhlelo lwakho lokusebenza, vula Umsebenzi omusha, yenza umsebenzi othile. Chofoza inkinobho ethi Ikhaya (uhlelo lokusebenza luzoba ngemuva, esimweni sokumiswa). Bulala Isicelo — indlela elula iwukuba uvele uchofoze inkinobho ebomvu ethi “misa” ku-Android Studio. Buyela emuva kuhlelo lwakho lokusebenza (qalisa ngezinhlelo zokusebenza zakamuva).
Uyini umehluko phakathi kwe-OnCreate ne-OnStart Android?
i-onCreate() ibizwa ngokuthi lapho umsebenzi udalwa okokuqala. i-onStart() ibizwa lapho umsebenzi usubonakala kumsebenzisi.
Iyini ukusetshenziswa kwe-SetContentView ku-Android?
I-SetContentView isetshenziselwa ukugcwalisa iwindi nge-UI ehlinzekwe kufayela lesakhiwo uma kukhona i-setContentView(R. layout. somae_file). Lapha ifayela lesakhiwo liyakhuphuka ukuze libukwe futhi lingezwe kumongo womsebenzi(Iwindi).
Ithini indima yomsebenzi ku-Android?
Ngale ndlela, umsebenzi usebenza njengendawo yokungena yokusebenzelana kohlelo lokusebenza nomsebenzisi. Usebenzisa umsebenzi njengesigaba esingaphansi sekilasi Lomsebenzi. Umsebenzi uhlinzeka ngewindi lapho uhlelo lokusebenza ludweba i-UI yalo. … Ngokuvamile, umsebenzi owodwa usebenzisa isikrini esisodwa kuhlelo lokusebenza.
Ngiyisebenzisa kanjani i-GetIntent ku-Android?
ungakwazi ukubuyisa le datha usebenzisa i-getIntent kumsebenzi omusha: Inhloso yenjongo = getIntent(); inhloso. getExtra(“someKey”) … Ngakho-ke, akukona okokuphatha ukubuyisa idatha evela kokuthi Umsebenzi, njenge-onActivityResult, kodwa okokudlulisa idatha Emsebenzini omusha.