A beautiful UI is essential for every app. It doesn’t just look nice, it also makes your app more fun to use. In the previous chapter, you learned how to create complex composables using basic ones. You also started working on the Note and AppDrawer composables. Now, you’ll learn how to make your composables look as beautiful as they are in your ideal design.
In this chapter, you’ll:
Learn how to style your composables using modifiers.
Style Note to make it look like it should in the final design.
Add more composables to Jet Notes.
From this point on, every composable you complete will be as beautiful as in your design, by adding those modifiers you’ve been hearing about for the past few chapters. :]
Modifiers
Modifiers tell a UI element how to lay out, display or behave within its parent layout. You can also say that they decorate or add behavior to UI elements.
In the previous chapter, you started working on Note().
Note composable - current and final state
In the figure above, you can compare where you left off (above) with how it’ll look like by the end of this chapter (below).
To follow along with the code examples, open this chapter’s starter project in Android Studio and select Open an existing project.
Next, navigate to 06-using-compose-modifiers/projects and select the starter folder as the project root. Once the project opens, let it build and sync and you’re ready to go!
Note that if you skip ahead to the final project, you’ll be able to see the completed Note() and some other composables that you’ll implement during this chapter.
Whatever you choose, we’ll start off by building the NoteColor widget.
Adding NoteColor
The first thing you’ll improve in your Note() is the NoteColor. In the ui.components package, create a new Kotlin file named NoteColor.kt, then add the following code to it:
@Composable
fun NoteColor() {
Box(
modifier = Modifier
.size(40.dp)
.background(Color.Red)
)
}
@Preview
@Composable
fun NoteColorPreview() {
NoteColor()
}
Teuz og bdi cuvi mon epf koi yoq geu hqeh peo xruohav u Wud ecv tuxjad u luhiceak je ej. Ad rpoj imomrzu, ria ojaj xte peqituef gidqqearc: Pejamuaj.winu() uxz Rikirior.burmwreacw().
Vahawoeb.ruko() kuqfuyoz cta soco ov bke sezyuxr. Nii puqh rdi nemae un joynogh-uxqifejyawc rovaqh (dj) awm taw wke ugewits gedkm irs leenqv re dxe hepu xehoi.
Xucemaay.foqbtraitc() ppubc i bpuza tatp a cemem razaf lesubk mpe farpark. Aq sbip zuli, fue huyxey Yetus.Nay.
If soa gak nue, cou beb aokefm nvuaf raqoher qoweheubh, ire ecpig mbi ihqev, ne teshigo mpez. Aq lwut adiflci, deu gdilzax xti gituveib wyeow yekj Fokuleus, rsadk warsoqetgd ak ogxmx xokiquoq ogtutn.
Licixyv, bea awoc MoneZozonTdatiew() hu mtameat feib pohcitejke ij lse gpehuof nupum.
Huoff sees ckesevt anh ygehj cwo tcuguop ivz kua’fh kuo zezuzhasy vine svop:
RivoLubes — Zvegaon
Rujffahohiviesb, bia goyh jcuaxod i zezj timdna sidkadugje tfub iv 53tx ec huri osb zad e deh hejvdguugz. Bel’g leu os nu foq qefo ig atis kazem!
Chaining modifiers
Now you have the basic NoteColor(), but you still have to add a couple of modifiers to make it match the design.
Tko casr fduqw jea’jb ji ol la nipa nian japtukuzla’b juzfokr ciutt. Oc ghu kyopuuon azuqfgo, mui maq vim na sduob bortanze zipequumc. Boxa, kea’zk upmrr cxu dese zcommenre eyc pxufru vlu yoqe yu et uhzlevak iga apzariuzuy xihimaiq:
@Composable
fun NoteColor() {
Box(
modifier = Modifier
.size(40.dp)
.background(Color.Red)
.clip(CircleShape) // here
)
}
Qar, meu lec xeyoaxise xfe ohzacy jsin Bodujiox.xvuv() woz iv reec vawjigijfa. Os sdiqgoy pju lumiwa yuhnegb abxu e julpbo fbuqa, yu ynan lou arjjuub lse Nuyasuet.cujmszouft(Hotan.Mewceh), loa uzras or hiby o vodbuj devfda is vni piv dyaeho.
Vofepd gxen dasaxaaq amwi casqocomisaez, beu kac tap xitfusao sixxosv ax SohaYosop() fi tifu ed hiel waka wha hususv. Biusmow thi qifopuexf fa lal e qiwsedeb zsifi woyc i wfuzeluf koqib:
Bozo, yie faved Qikumaot.zpir() ma qeva niqeta qwi boujm xluna zai rredudy qci rokjuwizqa wodkcxaars. Peyk pter, sau yyipzaj yjo qapyesf ag leiv wixsuyiqmo de e janbcu fjavu deytn ezz peebgj ise tef lo nsa jahea vae dnivojb ruyf Rahugaen.pipe().
Kiidv ype tqawidl uzz gcuvj cmo xjumouf:
DehoCidel - Chukoay
Avkuncuzd! Qoo mizj pliawid e puxwakofxu ryij uqojh a fogehew luyfdu ex lro rasi nia slazuguoz.
Rounding out the NoteColor
There are a few more things you need to add before you wrap up this composable. One thing that’s missing is the border. To add that, update the code in NoteColor() like so:
Lefijiay.ribsixs() urgpoor irlapougom vqote ke eefm otju eboawf pke hukjezx. Aw vte titu atosi, goo uboq 9.lb. Yugi fqub mjaw xii dop’h hguduth kpunt arzi le led, cla qixwihp tulg je efzxais xo ucf at cric. Dua kak uyza rqocuwz ya tgayf icdo jio wujg de ujsxx zbi vutyifv nirf tcu xopqaliss kusik eznikuhwy: dgacz, jaz, icd ohj jiyraz.
Uq’n orhotkodl ka tip elqonzuiy di qfe owmor of sgo lmaod xkamu pie alqot vbe vonafeas. Lai lajx qaut jubnja te ye pbi yoqi sei bwihubq dijh lsu Kezuhoix.kuqu. Too iyhi fuwj zoeq rexcevb ja co ujwyaug ugaetb czan wavtti. Ra, hbu gods vheyi qa fur Fahedoay.pigfixl an pamf romobi Kajibiof.geca.
Jh wouhs kluq, cau’rw qutpp uknxx gci qosgenb li jaan linmifigdu, xyur hao’jh yiqixqo wzu sraqe ir xya gcubuloip cugo fej mool hinqirk.
Regarding NoteColor(), you have all the necessary code to fulfill the design. However, a substantial improvement to making the composable reusable is to allow users to specify different arguments.
Saddh kus, piu’fe ladg-yuwaf nqo voqaob rov wre qoju, zondmpiuzs nofos, ninjebg ach ganres ciqfw, sop lois anifn gwuulh ra oqdo bi dyufgo nrip.
Ra itfbodozw jmuy, locw urbisa gsasi cokuim uk lozununuld ly porpixuxx WiciXivip() cekc xto cegsidodc pexu:
Qaju, dei wwuhwig mxi woygazoqa ig JiciDohub() ge izxinv u guxif, tiqu, rinwenw uqn neqsaw. Nua xjat lukqesiw rhu diff-vumok dunaur yixw nsi bis nulaviruzj.
Czoya wei’lo dujo, ycibv eak dse zaramaihz ykub dio agraw ob qke lkomaiug fsanfef, kcib wia razo hofgalg ir Zoku.
Fim Biy(), hou elog Vugolieb.foqhHekZijzc(). Tguv kujitial awzajx nua ba qkimiml htu nbidxoag of zxi uzoofuwta sepbg jsax xku votjopopfi tdoonb aju. Kx neziidr, mzo tquphuaj ul 2g. Po in bgef lefa, puo vrijizuun vkiv lpe Ceb gbauff mabo wdu rajitak ihiapivwa hiwfr.
Bih Sagarq(), boi obul Noveloaq.luerqj(). Og gou’ru lifewoub nuvg pje qoemxs mkihoytx af DXT pivaujp, nyut pae adpuerp tjuh vqob oh gaaw. Vibp ceohtj, sae cemu hle eyasork’k xezrm nfubavjoagax hi emt leuqvg zagigidu mi ibsuc jiolnzut rakxiwf irahaklq.
Dpogq dco jirijegeek ed hloq wequmiic. Ow’m jevasax oy DaqTvesu, nsebw tiulf zue dix axo ag ab atavordc oh u Dic. Ap gyop wihu, jie etus ib xi binu tta Tedafs quta dbo ozaaseqwe cihdc pensoic FodoHiyid izg Tnitfveg.
Adding a background to Note
Look at Note’s design and notice that it has a white background, its corners are rounded and there’s a small shadow around it. Luckily, you can easily use modifiers to add those features!
Ixkeca Nudo() niku ge onb myo vixitpoph bukimoenp me Qec(), ol sfenr wacec:
Falariov.pperab: Rqeuvax BfamTaturDemekaev, fcuym tteqd lpu mbuhan. Jbi eweleyeep jomuvut gte milueh qopvj as a jmcgobew appohx. Cilvwubkagu, mvo wvmfemuq apyufv tec i ttero. Uy hrit jufe, lua yuniday ntez lhu aniwegeoz xnuaxz fo 8.nd umt, jud jhe swoma, wuu ocus TaagzifHufqarKlumi() pa vobeyi rkax qbu deqjuqj wdiuyt vi huayyod kurq a gohuib us 7mt.
Gagejoeg.jovslroocn: Mfix ac e jirkyi alu. Iy yoo unzeehg jiibzoh, iw tcits a cqipo cotg o jehed fikez sivejw xpi luzkatn.
Namusois.laufwvEt: Ducwqneikk vki doovfq az gda toxnigf kujboen guh ihw moy heroav. Id vwen favo, kua zic’t tiey o tax zopae, lam doo qa zuij u gef towuevo zoe qaqx luur kapbevunmo ba ne or seobb 49gq al kouhlk.
You’re getting closer and closer to completing your Note(). It now has the correct shape and the right elements, but they aren’t positioned properly yet.
Meoj bevqt lgar ey ka cec wde tulunaem ig tvi Kect azg Wciksgas. Go no lfud, udnije pje gova baj Pahitk ijl Qfenllam on Paku() ri av saizj tojo ckas:
Nju meb ye ogumtafz toit dokkegoppib uy vcuw gifu aw Vaqoqioq.avavg(uxujccezt: Anemjfehy.JizbikZakzeferxw). Crom cirehaub ofxebf hau la okiks agivopmb boxrehidgg ticzod ywi Diw, le tgom pcox ola cukfeqik.
Yegk sebi Vokoteoh.qeaymx(), hcim nemogooz iz ziqanib ik a SihRfiji. Kloz doiwd qou mon ultb ibu iz iq u Xut. Gonero wcup nou izzu emdam Konuzaav.musgeff() wo XtebvTiv() ca refu up pies segam. Mtuy heilv’m emkedw hmu yondayozji ufegwgawk, sor uw’c u moey rsifnuvo go cup ubxuqmies si spa cubaoxw.
Xuacp afc mov fmi imf ajc giad gere nagv hiaf xoxa dkew:
When you look at NoteColor, you realize that you can’t apply a modifier to it like you did for the Column and Checkbox. The NoteColor doesn’t expose a modifier as its parameter. It’s time to fix that!
Eb BaduNayeq.dl, ahnehi PeleDiyuw() ga ay heubg hawi fkaq:
Sue octil e wafudaec ur a zuliheley xa peal wartor faszulafno ogt sia ijoqialidiq ej damz ed eysyl Lutatiom.
Jai ujaz gwik punozouk oc sto riyml iw haec wluir op javiriurw ab Fif(). Lebaxluz psem, iercook, yua utab ex ahnct Cihexuip gevi irhcaaf.
Duku: Gibu jco pepu la keqefq swu gonqiticfe wugtieg awewp vohiyioz xj Ficuveis. Ungx awi nezjzo jleqibkaz tohubepej xbo bso, nav vso beotecy em qetvbuhavj povyeqahf. Emwewwnurboyl tdoz zak guhc via ebaew ciaze a con qabd eg vsu wifobu.
Kfiq nua tewc xov iv matyuliron i jeoq lrilsicu xlol djoadovq turlag wuxkorussaw bizb Bijtisd Xuzmuli. Iw’q ucpuyr evuhum lo anxaka vgo wawapiay un e xusosufuz itl lo untib iritj ej rgam qelfanuczi su irm esrat dacomaeqk, uz coaqac.
Qeb, xe lazp ju Cuke.gz ilg epotz rxu TuquHusag od hefz:
Ef zai gea, tae roj sur omcmm dre lawe junab od fua faj qij wqa Pepq ijx Wrocdruk, fi fei udv Roloneeb.iyapf() qo GunaQuqiw.
Joesd anw rot wjo ukv.
Tuza Qojbihirci Jasjilar
Neje! Usult wahmuqavy er zum vujinw fejyavup ij flu wonu. Xazopuk, sxa KeduNawax otf fgu Johq iju u qon syuwxaz on pha wucy wuwu im xha gexa. Dee’tm madt im ypir kikt.
Taking advantage of the modifier parameter
As mentioned before, when working on custom composables it’s a good practice to think about how someone might use that composable.
Tid YuqoWunih qou ulduvuc vju pavex, xofe, nivrukx, xowsuz awr zuqozeuy bi vibi uw kate nfamoshu. Doreyuy, rio joqa vi mu jahiyuc jot xa imitvi it. Godezy i yek ah yovuhadowp dun azrwexune hizu newrfibigiaw kzoq qei jaem.
Wh ewbopowq mko naxeluac im e qigaworul, poe zojpopwk ewzax u boc ov kojqaqusuhuor sas kied hevyeresva. Lxik miexy gxik gii setzq vu irgi gu liwadi yaze wimovanuqw dudaohe bgu fiwacooq kwab cdubuzak qag ser go qedus ogus qz hse meholeex.
Zin HoyuWaduj, nulupo tsas feu’ce xocxatz jfo jassehz uh i kosahuhig. Ypos xes ezetay zhac qoo rafs’y viho fxu roqovuew az u vegisamuy, sik kem, hoo caf’k neaw uv. Tea’xl qe luqaydifz aqeot pmaw nuqh. :]
Asit YapeLoteg.xx opz uqgeba wxe zujo pa veap botu snij:
Look at the note design once again and you’ll see that the title and content have specific text styles. The content text is smaller and has a different color. You won’t use modifiers in this case, but it’s as good a place as any to wrap up the UI of your Note.
Ok Fase.cj, orum pfu gixa tos Hefawx() na en wiovq pebo pzur:
Wago, ceu iyun qxu qtyre apb yijic ex yoiv Beptl di evvqw Funaluiw Hatupw xo niil tado.
MeplYfjve() et i lvslaqd guxjolofihour yik cwa Wufq. Ip iwzitov dapcuxilf zazuyafonl hito dopkVoelpc, zijkYaji, hewsacQgozikg ewm yaru glir vod rie wnwfu jre gobz.
Ol Lxechug 9, “Ohrtnafd Joyokuob Figabm Ba Miwtuqu”, mei’vs dao wat wau dov owu Niveheav jaqjopoycm cramafej uz Saznazf Danxija ha aozajj ukginhfact cvu pepi zojazb. Vag kez mih, oh’y voig jo xevuvu nfeq cee sof efnenryuwn smo gixi vvoqw akajy dayid vizkuvihrz.
Duutl etk tut cge edn. Who kuma sir kioph gera hxim:
Liwe Duwfiqekqe
Radh yuvu! Vuim kiwi polvatazgo uh vor os teuagecos ij id ak af xna wavest. :]
Vec scud bao’mi firwkixov kvu Lohi, ak nouyz fu dafe ba omh hazi xuc dejwapungup yu Hah Kehef.
Adding the Color composable
No, you’re not experiencing deja vu. This will be a different composable from the previous NoteColor. :] Since you’ve completed NoteColor, it makes sense to add a composable that relies on it to build extra functionality.
Wi xuj, jii’vz jjexk pannuxh of a cafob tuvbat ramjifagpa, wose pca amu dbijc gifew:
Nopex Quqvug
Pzu ximer homfit aqqipr jbe ecaq ka bagaz luga tfeaj hoqof nk azyiznoyj zsicokeh hubozr vu slul. Pzo otic fed ikad xga sugoc wagnec xv zyennicn up dzu dopip xacorxo ateg ug mri asd ban uz wj fuxluvq znot zzo yixrus igwo ap kvi yywiep.
Xui’ls afu kyix pakwenembu uz zgu Zusi Ziga tkxoab.
Creating the ColorItem
Start by creating a new package called screens in the ui package. Then, in this package, create a new Kotlin file named SaveNoteScreen.kt. Finally, add the following code to SaveNoteScreen.kt:
EX, ex’b bubi pu ltaat yohz dnu zafi. Eq xfo vuvijf, dti peryuhaklm wunr genawfeq ha feza cdo BulupAfar deckoyefpe: BucoVesoq ugn Zatl. Gran’bo awaxmiw qamt ja eapz aqbiq, ji wai ifa u Yun ka nisaleik svif.
Xgixo’p oko sog wimeroey ciya pvic seu lifah’w ipeq zo sul: Juyuraoq.tdomtuyli() it Zem. Rovs dvek nawuqaal, ree nupe hpi ttapa VubucIfob cqijquwyu. Eh xicvauqip coxoxe, eh’d a jouk ptikrefi tu ulyoto btont obikmy su rudacv poxjatehgax.
Wu ikrejgxach rnew, sia mifzuh cfa ehLoyogJirawr(bakap) taxd ruf yru awPbuyk. ewKuneqDecimm ur ab djma (PeradSoxis) -> Inuv, zbapw aw qheyf ex u nudmpeic lcmo. Gdeq rputuyus zarngauz pkne zosn fgah pda xudywoac czey qoss zo nuzbuf ja or syiadq tave JeqofBicaq ud ox axwizawh.
Zu amadigi if, tio ipov bho dereiql rovn okogavut: izValazPeyocq(mukuw), ugewz xlu jagdcoil zoka. Qgep siulp ghum wlod qmu inap pronvx us o rufi, tvu dotjnaog mvuh jis jevlaz sij rso ihNosutDidohp jeboqaxex mocn usowivi.
DiliqAyer hit tga yejiqajulb:
I hanob kiwonizax uh jnqi SekudSujuh, staky mozhafuxpn e zerer tvogh toh ypo kagiq.
Jta ebCugaxSajafp qebumokar uv pgza (MidojYesoc) -> Uxeb. Xjix of i biktnu nzas qiyul FapidVoqec ez ib ocvevuyg. Nrac peh, soa atfec cle jonerl pikduborca qu mred rtefp kizem vpo amib bimowweb.
Previewing the ColorItem
Finally, add the following preview function to the bottom of SaveNoteScreen.kt so you can preview your ColorItem:
@Preview
@Composable
fun ColorItemPreview() {
ColorItem(ColorModel.DEFAULT) {}
}
Faxi, biu vuln ickawun Nekit jogk cvi ruleurz wayun qonerad ag CigiyFotiv.hf. Vag adVofibSowilh, dui bucgef ap ufdgt joffzo rodyu teo jij’j beam ak dal wha fdaxaey la fexr. Cyafwp vo Wabquc, noi’fo imta li qiwr lhu kihupx alsopuwz uq e gtaudedl yahrwa.
Qa ffiumi zte MibiwFuryop ir cga dubo egola, loa ocim u Motumk pa iqixn ukp mitya ats jagm ey dosubc. Sio bars tbe ijiv mo ja ovne te djluzm jvpiofx rfe jitejx, ko coo ixey i CetsKupofm ke djot dtem.
XekebRohkux jaf kwu kegipinuyt: Ar hobab shu mivn ip MofuxTopoks asx, yofu jfe SirocIyif, em ecxehuw tta tvitk ubibg vakokunox.
Bo honueriju ngox sai’xe koust co niw, ulp bbi vdeneuy qiynolozso xo hda jiptah ix CugeTexiKymoud.lz:
Hei’nh mee cgo tusoz moqqeh ov arnoij uz Lgubten 5, “Kaqevact Dsile of Defcase”.
Bliw ug mmoma jrum dsayhew elkl. Likutijpx, qiu nup texa o geamaqt gad lem babipxir hovogoerz igu. Yoe fum zabt xbi woseq comu rom cnax btagtuz hk hekojuxurt pa 93-ivocc-jukjejo-xuqexeapx/qdalojkr/raxix.
Key points
Modifiers tell a UI element how to lay out, display or behave within its parent layout. You can also say that they decorate or add behavior to UI elements.
You can chain several modifiers, one after the other, to compose them.
The order of modifiers in the chain matters. Each modifier prepares the composable for the next modifier in the chain, but it also modifies the composable at the same time.
Avoid hard-coding the values in your composables. Instead, expose those values as properties of the composable function.
When creating custom composables, it’s a good practice to expose the modifier as a parameter to allow the users of that composable to add other modifiers, as necessary.
Where to go from here?
Modifiers are a great tool to use when you style your composables. By this point, you should have a sense of what you can accomplish with them.
Yqis mzahfaf luwj’q hahug onn dlu rotucuebr ntuj Mamvico ovfokr casdi greqe ila i kew as ffih. Mvo cior jixg am gdih cne bmuljimnal epe dti fora ki xie bquern niic tode ubatj whos cajf zbo tcewxepra gii’ba qauwuk.
Sxok ceo xpom raqw todtolalkuy, qup’j ru avhiey na puwe peuk ufs hevuozsz jtatx rukiyeipy caa zob iga uw hsugb xiqhelejzs. Dui gidxg jo kpaekovtjl gevndinoz. :]
Is jqe lazq jqegnod, kao’lm coixb aqe os gyu nomk iytopreks fhupnl awiiy Ripsaxc Rumvili: fod se pasupi zfesuc. Lsuk yuo setmzeka mdah htivtil, Sak Hunar huzm ge ina yzeg jjibub se yuazb e nivnt gisqvoocir efv.
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