Tugas 2 - Membuat Aplikasi Sederhana dengan Jetpack Compose

Membuat Aplikasi Sederhana dengan Jetpack Compose

Ricardo Supriyanto 5025221218

Jetpack Compose adalah toolkit UI modern untuk pengembangan aplikasi Android yang dikembangkan oleh Google. Dengan menggunakan Kotlin sebagai bahasa pemrograman, Compose memungkinkan pengembang untuk membangun antarmuka pengguna yang deklaratif dan reaktif dengan sintaksis yang lebih sederhana dan ekspresif.

Berdasarkan panduan yang diberikan pada dokumentasi JetPack Compose, di mulai dengan membuat project Compose baru di Android Studio, lalu membangun antarmuka pengguna sederhana menggunakan fungsi composable. Setelah itu, menyesuaikan UI dengan menambahkan elemen-elemen seperti kolom dan baris, serta menerapkan tema dan gaya.

Untuk memulai project Compose baru, buka Android Studio.

Jika baru memulai di jendela Welcome to Android Studio, klik Start a new Android Studio project. Jika sudah membuka project Android Studio, pilih File > New > New Project dari panel menu.

Untuk project baru, pilih Empty Activity dari template yang tersedia.

Setelah itu, lanjut untuk mengedit berdasarkan dokumentasi tersebut. Berikut merupakan isi dari code saya.

Link Github: Tugas 2 - PPB

package com.basicscodelab

import android.content.res.Configuration.UI_MODE_NIGHT_YES
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.animation.animateContentSize
import androidx.compose.animation.core.Spring
import androidx.compose.animation.core.spring
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.foundation.lazy.items
import androidx.compose.material.icons.Icons.Filled
import androidx.compose.material.icons.filled.ExpandLess
import androidx.compose.material.icons.filled.ExpandMore
import androidx.compose.material3.Button
import androidx.compose.material3.Card
import androidx.compose.material3.CardDefaults
import androidx.compose.material3.Icon
import androidx.compose.material3.IconButton
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.saveable.rememberSaveable
import androidx.compose.runtime.setValue
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.basicscodelab.ui.theme.BasicsCodelabTheme

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            BasicsCodelabTheme {
                MyApp(modifier = Modifier.fillMaxSize())
            }
        }
    }
}

@Composable
fun MyApp(modifier: Modifier = Modifier) {
    var shouldShowOnboarding by rememberSaveable { mutableStateOf(true) }

    Surface(modifier, color = MaterialTheme.colorScheme.background) {
        if (shouldShowOnboarding) {
            OnboardingScreen(onContinueClicked = { shouldShowOnboarding = false })
        } else {
            Greetings()
        }
    }
}

@Composable
fun OnboardingScreen(
    onContinueClicked: () -> Unit,
    modifier: Modifier = Modifier
) {
    Column(
        modifier = modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Text("Welcome to the Basics Code lab!")
        Button(
            modifier = Modifier.padding(vertical = 24.dp),
            onClick = onContinueClicked
        ) {
            Text("Continue")
        }
    }
}

@Composable
private fun Greetings(
    modifier: Modifier = Modifier,
    names: List<String> = List(1000) { "$it" }
) {
    LazyColumn(modifier = modifier.padding(vertical = 4.dp)) {
        items(items = names) { name ->
            Greeting(name = name)
        }
    }
}

@Composable
private fun Greeting(name: String, modifier: Modifier = Modifier) {
    Card(
        colors = CardDefaults.cardColors(
            containerColor = MaterialTheme.colorScheme.primary
        ),
        modifier = modifier.padding(vertical = 4.dp, horizontal = 8.dp)
    ) {
        CardContent(name)
    }
}

@Composable
private fun CardContent(name: String) {
    var expanded by rememberSaveable { mutableStateOf(false) }

    Row(
        modifier = Modifier
            .padding(12.dp)
            .animateContentSize(
                animationSpec = spring(
                    dampingRatio = Spring.DampingRatioMediumBouncy,
                    stiffness = Spring.StiffnessLow
                )
            )
    ) {
        Column(
            modifier = Modifier
                .weight(1f)
                .padding(12.dp)
        ) {
            Text(text = "Hello, ")
            Text(
                text = name, style = MaterialTheme.typography.headlineMedium.copy(
                    fontWeight = FontWeight.ExtraBold
                )
            )
            if (expanded) {
                Text(
                    text = ("Compose ipsum color sit lazy, " +
                            "padding theme elit, sed do bouncy. ").repeat(4),
                )
            }
        }
        IconButton(onClick = { expanded = !expanded }) {
            Icon(
                imageVector = if (expanded) Filled.ExpandLess else Filled.ExpandMore,
                contentDescription = if (expanded) {
                    stringResource(R.string.show_less)
                } else {
                    stringResource(R.string.show_more)
                }
            )
        }
    }
}

@Preview(
    showBackground = true,
    widthDp = 320,
    uiMode = UI_MODE_NIGHT_YES,
    name = "GreetingPreviewDark"
)
@Preview(showBackground = true, widthDp = 320)
@Composable
fun GreetingPreview() {
    BasicsCodelabTheme {
        Greetings()
    }
}

@Preview(showBackground = true, widthDp = 320, heightDp = 320)
@Composable
fun OnboardingPreview() {
    BasicsCodelabTheme {
        OnboardingScreen(onContinueClicked = {})
    }
}

@Preview
@Composable
fun MyAppPreview() {
    BasicsCodelabTheme {
        MyApp(Modifier.fillMaxSize())
    }
}