Yini isipina ku-Android ngesibonelo?
I-Android Spinner ifana nebhokisi le-combox le-AWT noma i-Swing. Ingasetshenziselwa ukubonisa izinketho eziningi kumsebenzisi lapho into eyodwa kuphela engakhethwa ngumsebenzisi. I-Android spinner ifana nemenyu yokudonsela phansi enamanani amaningi lapho umsebenzisi wokugcina angakhetha khona inani elilodwa kuphela.
Kuyini ukulawula kwesipina?
I-Android Spinner iwukubuka okufana nohlu lokudonsela phansi olusetshenziselwa ukukhetha inketho eyodwa ohlwini lwezinketho. Inikeza indlela elula yokukhetha into eyodwa ohlwini lwezinto futhi ibonisa uhlu olwehliswayo lawo wonke amanani lapho sichofoza kukho.
Ungayisebenzisa kanjani i-spinner e-Kotlin?
Ikhodi yesipina ye-Android
- Isinyathelo 1: Dala i-Spinner kufayela lesakhiwo. …
- Isinyathelo sesi-2: Engeza i-AdapterView. …
- Isinyathelo sesi-3: Lungiselela izinto eziningi ezizoboniswa ekubukeni kwesipina. …
- Isinyathelo sesi-4: Setha i-setOnItemSelectedListener kusipina. …
- Isinyathelo sesi-5: Dala i-ArrayAdapter ngohlu lwezinto nezakhiwo ezizenzakalelayo. …
- Isinyathelo sesi-6: Setha i-ArrayAdapter ibe Spinner.
How can use spinner inside RecyclerView in Android?
- Remove allocations from onBindViewHolder. In the following code: …
- Reuse LayoutInflater, instead of getting a new one every time. In the following code: public RecyclerView. …
- Minimize repetitive work in onBindViewHolder implementation. …
- Spinner Adapter should also recycle the views.
4 авг. 2016 g.
Iyini i-TextView ku-Android?
Izikhangiso. I-TextView ibonisa umbhalo kumsebenzisi futhi imvumela ngokuzithandela ukuthi ayihlele. I-TextView iwumhleli wombhalo ophelele, nokho isigaba esiyisisekelo silungiselelwe ukuthi singavumeli ukuhlela.
Iyini i-ArrayAdapter ku-Android?
I-ArrayAdapter ikilasi le-Android SDK lokulungisa izinto eziningi njengomthombo wedatha. Ama-adaptha asetshenziswa i-Android ukuphatha umphumela omisiwe ngendlela efanayo noma ngabe usuka kusizindalwazi, ifayela, noma izinto ezisenkumbulweni ukuze uboniswe engxenyeni ye-UI. I-ArrayAdapter iwusizo kokugcina.
Yini intombazane yesipina?
Umsuka: owesifazane mncane ngokwanele ukuthi angaphothwa ephezu kwendoda ngesikhathi socansi. Intombazane ebengiyixhume izolo ebusuku ibiyi spinner.
Ngazi kanjani ukuthi isipina sami se-android asinalutho?
Umqondo : I-Spinner ku-android empeleni iqoqo lokubukwa kombhalo okufakwe kuhlu ngokuya ngenani lokufakiwe ohlwini. Odinga ukukwenza nje, ukuhlola ukuthi isipina asinalutho yini bese ukhetha ukubuka kombhalo okuzenzakalelayo bese usetha umlayezo wephutha kulokho kubuka kombhalo.
Ngilithola kanjani inani lesipina?
Buyisa uhlu lokudonsela phansi lwe-Spinner inani lento ekhethiwe ku-android. I-Spinner iwuhlobo lwemenyu yohlu oludonsela phansi futhi ungakhetha into yakho ngokuthepha kusikrini seselula. Umsebenzi we-OnItemSelectedListener() uyasebenza ukuze uthole inani lento ekhethiwe kumenyu yohlu lokudonsela phansi lwesipina.
Iyini i-spinner ye-Android?
Spinners provide a quick way to select one value from a set. In the default state, a spinner shows its currently selected value. Touching the spinner displays a dropdown menu with all other available values, from which the user can select a new one. You can add a spinner to your layout with the Spinner object.
Ngingasebenzisa kanjani isipina esingaphezu kwesisodwa ku-Android?
Ungabelana nge-adaptha phakathi kwama-Spinner ahlukene uma eguqule ulwazi olufanayo. Ngokusobala i-adaptha yakho ngayinye idinga ukulungisa isethi ehlukile ye-String s, ngakho-ke udinga ukudala i-ArrayAdapter yesipina ngasinye. I-OnItemSelectedListener eyodwa izosebenzela ama-Spinner angu-3 (inqobo nje uma uwasethile).
Ayini ama-adaptha ku-Android?
Ku-Android, i-adaptha iyibhuloho phakathi kwengxenye ye-UI nomthombo wedatha osisiza ukuthi sigcwalise idatha engxenyeni ye-UI. Iphethe idatha futhi ithumele idatha ekubukeni kwe-Adaptha bese ukubuka kungathatha idatha ekubukeni kwe-adaptha futhi ibonise idatha ekubukweni okuhlukene njengokuthi ListView, GridView, Spinner njll.