AndroidCompose-Study/week2 at main · Dolchae/AndroidCompose-Study · GitHub

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// Dice Roller MainActivity
package com.example.diceroller

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.material.MaterialTheme
import androidx.compose.material.Surface
import androidx.compose.material.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.tooling.preview.Preview
import com.example.diceroller.ui.theme.DiceRollerTheme
import androidx.compose.material.Button
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.res.stringResource

import androidx.compose.foundation.layout.height

import androidx.compose.foundation.layout.Spacer

import androidx.compose.ui.unit.dp

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            DiceRollerTheme {
                DiceRollerApp()
            }
        }
    }

}

@Preview(showBackground = true)
@Composable
fun DiceRollerApp() {
    DiceWithButtonAndImage()
}

@Composable
fun DiceWithButtonAndImage(modifier: Modifier = Modifier) {
    var result = 1
    Column(
        modifier = modifier,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Image(painter = painterResource(imageResource), contentDescription = result.toString())
        Button(onClick = { result = (1..6).random() }) {
            Text(stringResource(R.string.roll))
        }
    }
}}


//TipTime MainActivity
package com.example.tiptime

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
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.text.KeyboardOptions
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.material3.Text
import androidx.compose.material3.TextField
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
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.input.KeyboardType
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import com.example.tiptime.ui.theme.TipTimeTheme
import java.text.NumberFormat

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            TipTimeTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {
                    TipTimeLayout()
                }
            }
        }
    }
}

@Composable
fun TipTimeLayout() {
    var amountInput by remember { mutableStateOf("") }

    val amount = amountInput.toDoubleOrNull() ?: 0.0
    val tip = calculateTip(amount)

    Column(
        modifier = Modifier.padding(40.dp),
        horizontalAlignment = Alignment.CenterHorizontally,
        verticalArrangement = Arrangement.Center
    ) {
        Text(
            text = stringResource(R.string.calculate_tip),
            modifier = Modifier
                .padding(bottom = 16.dp)
                .align(alignment = Alignment.Start)
        )
        EditNumberField(
            value = amountInput,
            onValueChanged = { amountInput = it },
            modifier = Modifier.padding(bottom = 32.dp).fillMaxWidth()
        )
        Text(
            text = stringResource(R.string.tip_amount, tip),
            style = MaterialTheme.typography.displaySmall
        )
        Spacer(modifier = Modifier.height(150.dp))
    }
}

@Composable
fun EditNumberField(
    value: String,
    onValueChanged: (String) -> Unit
) {
    TextField(
        value = value,
        singleLine = true,
        modifier = modifier,
        onValueChange = onValueChanged,
        label = { Text(stringResource(R.string.bill_amount)) },
        keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Number)
    )
}


private fun calculateTip(amount: Double, tipPercent: Double = 15.0): String {
    val tip = tipPercent / 100 * amount
    return NumberFormat.getCurrencyInstance().format(tip)
}

@Preview(showBackground = true)
@Composable
fun TipTimeLayoutPreview() {
    TipTimeTheme {
        TipTimeLayout()
    }
}