Umsebenzi sisikrini esinye kwi-android. … Ifana nefestile okanye isakhelo seJava. Ngoncedo lomsebenzi, ungabeka zonke izinto zakho ze-UI okanye iwijethi kwiscreen esinye. Indlela yesi-7 yobomi bomjikelo wobomi ichaza indlela umsebenzi oya kuziphatha ngayo kwiindawo ezahlukeneyo.
Uthetha ukuthini ngomsebenzi kwi-Android?
Umsebenzi inikeza ifestile apho usetyenziso luzoba UI yayo. Le festile igcwalisa ikhusi, kodwa inokuba ncinane kunekhusi kwaye idande phezu kwezinye iifestile. Ngokubanzi, umsebenzi omnye usebenzisa isikrini esinye kwi-app.
Yintoni umsebenzi kwi-Android ngomzekelo?
Umsebenzi umele isikrini esinye esinojongano lomsebenzisi njengefestile okanye isakhelo seJava. Umsebenzi we-Android yinxalenye yeklasi yeContextThemeWrapper. Iklasi yoMsebenzi ichaza ezi call backs zilandelayo, okt iziganeko. Awudingi ukusebenzisa zonke iindlela zokufowuna.
Yintoni umahluko phakathi komsebenzi kunye ne-AppCompatActivity?
Umahluko phakathi kwazo ngulo: Umsebenzi ngowona usisiseko. Ngokusekwe kuMsebenzi , iFragmentActivity ibonelela ngokukwazi ukusebenzisa i Fragment . Ngokusekwe kwiFragmentActivity , I-AppCompatActivity ibonelela ngeempawu kwi-ActionBar .
Ziziphi iindlela zomjikelo wobomi bomsebenzi we-Android?
Isishwankathelo se-Android Lifecycles
| Iindlela zoBomi boMsebenzi | ||
|---|---|---|
| indlela yokwenza | inkcazelo | Indlela elandelayo |
| Yenza () | Ibizwe xa umsebenzi uqala ukuyilwa | kwiStart () |
| ukuqala kwakhona () | Ifowunelwe emva kokuba umsebenzi uyekile, phambi kokuba uqalise kwakhona | kwiStart () |
| kwiStart () | Ibizwa xa umsebenzi ubonakala kumsebenzisi | onResume()/onStop() |
Yintoni ukusetyenziswa kwenjongo kwi-Android?
Injongo kukuba ukwenza intshukumo kwiskrini. Isetyenziswa kakhulu ukuqalisa umsebenzi, ukuthumela umamkeli wosasazo, ukuqala iinkonzo kunye nokuthumela umyalezo phakathi kwemisebenzi emibini. Kukho iinjongo ezimbini ezifumanekayo kwi-android njengeNjongo eNgaphandle kunye neenjongo ezicacileyo. Nanku umzekelo ongumzekelo wokuqalisa umsebenzi omtsha ngomsebenzi omdala.
Yintoni umahluko phakathi komsebenzi we-OnCreate kunye ne-OnStart?
onCreate() yi ebizwa ngokuba xa umsebenzi usenziwa okokuqala. onStart () ibizwa ngokuba xa umsebenzi ubonakala kumsebenzisi.
Ngaba i-onCreate ibizwe kube kanye kuphela?
@OnCreate yeyokudala kuphela, kwaye kufanelekile ukubizwa kube kanye kuphela. Ukuba unayo nayiphi na inkqubo onqwenela ukuyigqiba amaxesha amaninzi kufuneka uyibeke kwenye indawo, mhlawumbi kwindlela ye-@OnResume.
Yeyiphi i-callback ebizwayo xa umsebenzi uqala kwakhona emva kokuwuyeka?
Ngenxa yesi sizathu, kufuneka usebenzise rhoqo onStart () indlela yokufowuna njengeqabane kwi-onStop () indlela, kuba inkqubo ifowuna kuQala () zombini xa isenza umsebenzi wakho naxa iphinda iqala umsebenzi ukusuka kwimeko yokumisa.