Learn first jetpack compose ui

FirstUI.kt

import androidx.compose.animation.AnimatedVisibility
import androidx.compose.foundation.Image
import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.Spacer
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.safeContentPadding
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.material3.Button
import androidx.compose.material3.ButtonColors
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Text
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.text.style.TextAlign
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import org.jetbrains.compose.resources.painterResource
import org.jetbrains.compose.ui.tooling.preview.Preview

import firstcmpproject.composeapp.generated.resources.Res
import firstcmpproject.composeapp.generated.resources.compose_multiplatform
import firstcmpproject.composeapp.generated.resources.yippy

@Composable
@Preview(showBackground = true)
fun App() {
    MaterialTheme {
        Column(
            modifier = Modifier
                .fillMaxSize()
                .background(
                    color = Color(0xffffffff)
                )
                .padding(16.dp),
            horizontalAlignment = Alignment.CenterHorizontally
        ) {
            Image(
                modifier = Modifier.size(300.dp),
                painter = painterResource(resource = Res.drawable.yippy),
                contentDescription = "This is a yippy"
            )
            Spacer(modifier = Modifier.height(48.dp))
            Text(
                "You guys are awesome",
                style = TextStyle(
                    fontSize = 48.sp,
                    fontWeight = FontWeight.Black,
                    textAlign = TextAlign.Center
                )
            )
            Spacer(modifier = Modifier.weight(1f))
            Button(
                modifier = Modifier.fillMaxWidth().height(56.dp),
                onClick = {},
                colors = ButtonColors(
                    containerColor = Color.Blue,
                    contentColor = Color.White,
                    disabledContainerColor = Color.Gray,
                    disabledContentColor = Color.Cyan
                )
            ){
                Text(
                    "Continue",
                    style = TextStyle(
                        fontSize = 24.sp,
                        fontWeight = FontWeight.Normal,
                        textAlign = TextAlign.Center
                    )
                )
            }

            Row(
                modifier = Modifier.fillMaxWidth(),
                horizontalArrangement = Arrangement.SpaceBetween
            ) {
                Row {
                    Box(
                        modifier = Modifier.size(24.dp).
                        background(
                            color = Color.Magenta,
                            shape = RoundedCornerShape(24.dp)
                        ),
                        contentAlignment = Alignment.Center
                    ) {
                        Text("1")
                    }
                    Text(
                        modifier = Modifier.padding(start = 12.dp),
                        text = "Hello"
                    )
                }

            }
        }
    }
}