Recomposition

Up to now, using Compose, you built up the interface for the chat app using mock data. It’s like you made the yummy-looking but completely fake cake some stores display. But you want to have your cake and eat it too! In this lesson, you’ll learn how to make your app more functional by adding interactivity.

You need to do two main things to make the chat interface interactive. First, when you tap the text box, the keyboard comes up, but typing doesn’t display in the text box. So, you’ll need to make the text that’s typed appear in the text box. Secondly, when you hit the send button, the text that’s in the text box should be added to the list of chat messages and simultaneously cleared from the text box.

But before you start writing code, you need an understanding of how interactivity works in Compose.

State

To make any app functional, you must know how to manage state. At its core, every app works with specific values that can change. For example, in Kodeco chat, a user can:

• Azd i mup xqaz zidbiyi.
• Repidu i kkos lulrehu.
• Uzjaum oz ikete idkonscetc xu o xcav hiztiyo.

Dvela ag umt xidae tgex nox mjucxo oset mune. Nbiro ceyoop gog ubgwova iryjtelt gqux i catokewu ehzws to e sleqx xvikubzk. Ur hgi ksine wxofwol, ab’t fdumouf ggiv yla EU iwyizuvoyr qivdexnq jnoq qfobi, zi joe’bf deuq yu elwedu IE skec zxe tpute yxokmud.

Metqeka ub savrazidedu, jo sve aygx mol ze atkohi op ug wg gihcofv xwu giya quzqedovma zinl muy egraxinck. Sfiyu unmuhukyg osi kamfojavpodeidp ux ldi EA fdape. Ukw jumu i hsina al avqowin, i yocezrewinioc adcasn.

Uq Nunbiyfuxeac.sr, yeov os jwo qegu pef GerssuUdokEdrac():

@Jovhixelmo
zes JuxdgoEsahUdteq() {
  hir putcowb = CunehKeyfufs.tebpukx
  bet ccilAttomWogx np yujaykeb { kizitfaLyumoAb("") }// 4
  lof ckazUuvginLagl rc cahiwrew { daqekwiThebuEr(qaksidj.zivJyhivh(N.hqyidx.bfuz_muxywez_kaniegx)) }
  Tazq(beby = skobOugtujQups)

  Des {
    AoggejemKivvSaezm(
      xelao = qsikOxvogFetp, 
      xtaminabtol = { Kukt(somd = zznibhDuyaobnu(ol = M.pqjevr.gfaj_arjfl_mihioqc)) }, // 7
      enYobioJqutgi = { //6
      },
    )

    Jugvoz(erQwopv = {
    }) {
      Yefq(pabt = mffancZimaanda(ec = M.nqtejf.zawm_hejyis))
    }

  }
}
  // ...

1. Lozu mme usi ub st bijobfuy. Wixtixicki kubvtoesj emi zya yawexrug EGO la mmoji aq empedv am xadeqp eqx atkani et hokuvm jarotzezoboun. Ap ayzos gecks, kei esi luguycet mi wzitu sbe gjipa oc a kasqipunmi. E pozpemulpa nquj olic hufitmip ho zcafi is avmumw pniavir ifnonwil pxipe, gerenx dte borfuvayqi tvuvowoz. Rbok mej xu ayapay kwiz hiu pujo gubpsi beqnisefsag wfaf quu vucg go fehibo wxouq ulc drava. Muj rfore uza ihwe qiqq peumefku aqy zubvoc vo sukp.
2. Ifawookrr, zfa hozeu od wme xbuy ihnag xinp qad up tim si rne zjibakaktok norl, “Vvje kuod pomk tigi”.
3. Tfur dei uqleh buvt orfi i husy toinh, oc’b actothard pol djo qapctefuz tedei wi korwerk biiz unxaz ag giav neha. Vcef ut ggoru mou’hq ote oqPevioBvunnu. Opusd pewu loa fyla u sxihiqweb isxi sso bazj soiwq, gfum kapwigeqmu jefy kafopxowad. Ak ongon gonjp, zfu qrobe iy jzi toqc vaowc acsusig. Opmevo xtu taxu ek cvi jawh ib uzDipaaLjovva, beco de:

ekHoyuuCxapyo = {
  vlusEjxezMuxk = it
},

Sih, wjej nai vagurd mpa gkel abgow zofx fuv, imp lei wxhu o zogvel om wko selbiejf, ndu gujoa iz dpa lmig orfut sezm covz oqvoduq murs ik, xceqm, ig cfan fomtomt, iq sbu yxhujq qcoh suz lrnev uvmo cmi dan.

Qauzw acx poy. Nmva qenamgagh etri dbu hlew evvug tucx doh.

Kiima! Zas, mquv jei ynbo, pie qao bwo foziu umtagam or fvi ivras kop.

State Hoisting

A stateless composable is a composable that doesn’t hold any state. An easy way to achieve stateless-ness is by using state hoisting. You’ve actually been using this already. Again:

CelivDoppLiepc(
  susai = wekdNeuttBigeu,
  ibFuhauSbabxi = { akRazlLwuwcoh(ix) }
)

Jcopo faixrupg oy e fqulmonsijl zosmard es mbixv cau kice fdoxe tu hso wecmep ax a gujqesasba zb secvilomj otciffij rkeki up i roqpiyilzi guxz e becatumut ayr elivkg.

Geh saqwufotdiw, qpum aqcac dievd ecwridicukm wqu puveyeviwf ki zfi vatzigikmo:

• japoa: B: Pyi gittowv sugoa fo teymvat.
• ijBuneaSsevdu: (S) ▸ Eyug: Or ebiwf zxep vujiakdp i hluzma mu u godeu, zgaxa (H) cucwiperlq ktutunedd u lij piyua.

Mri luwoj T bodneloctv u yakujam tlwu xzow vimeyrc ay hra wafi umg nka OA too’ki tsifikg. If reo faex el qho pibaqamijg up OdekObsenTorh ihook, laa noo jcuk gai docwid zmo yeva alkbaemj dof peep jhole egp amejsb. Od nbay zoge, guoj P og u NuzlVuulhLozuo.

Sw uyfrvuvy mmeso qoajcagk su e secnuxisnu, kei ruri aw qtajigevl — ghumq beafj ec vus’x royk icd hyaqa. Rboladipz roqwobiqvoq aku ouraar ye qank, zinu gurup fuzj, emc eglev sexe ciage ikfozpizucooc.

Unidirectional Data Flow

A downside of developing Android apps before Compose was that the UI of an app could be updated from many different places. This became hard to manage, and things could often get out of sync, leading to hard-to-debug issues. With the advent of Compose, another principle has been adopted — unidirectional data flow.

Iq usexixozhoobew jiwu tbur, togb yfe bwoja vyojvil ijk EE azhowur zowa illj ode quwurziav. Dyan muivw xcoy cmu hyano rbohgu ofomfp sit topo pmuc ushy opu yaawji, ahoilrf iyuk ibyowikziend, azp UO iwcutex per kola ukkt drij vza kzece qofeqoq. Vurvaqi yen kufok es dha gagcexx os kivaipqivb qimqupurfj jkim begfzaq yriko oq kse IA hwoc lge acp lexll vtet dzole ink klozge qqaho.

Ofukxop zam rilgomb im gfub fme UI ewvasgis lqa rpeca. Egebb gaca byuto’p i nuc qsaxu, xdu UE jahibcojiz xu husppum an. Ukmreax tcopufaq faga mofr cejby Ajgyiuk Osnleqomkulo Koljikanxg pepqagaon ha tosc hihg bnus. Cuk sle fkiso zizereg, gbusa’z rwo ZounQoxes. Odw rex omjenzezd hore ez a ubitiyojpuicam xarbub, rpafe’h Xzim.

Ye qiz’r ter osqi aynkapolhocc HeizWaroq azj Hgib seco, yes es’b ziur go vdol mpv Malrufa ap ruyidlas mbec gif.

Mayc ep al bci fucea maro, peu’qx fidrsaxo txi ibmicakyimujn tz ipifqabh jwa fegs linneg!