Melakukan perubahan pada rumus perhitungan agar lebih akurat pada perhitungan usc atau non usc unit, dan sedikit perapihan pada tampilan
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@ -1,214 +1,314 @@
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/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.tiptime
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import android.os.Bundle
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import androidx.activity.ComponentActivity
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import androidx.activity.compose.setContent
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import androidx.activity.enableEdgeToEdge
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import androidx.annotation.DrawableRes
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import androidx.annotation.StringRes
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import androidx.compose.foundation.layout.Arrangement
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import androidx.compose.foundation.layout.Column
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import androidx.compose.foundation.layout.Row
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import androidx.compose.foundation.layout.Spacer
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import androidx.compose.foundation.layout.fillMaxSize
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import androidx.compose.foundation.layout.fillMaxWidth
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import androidx.compose.foundation.layout.height
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import androidx.compose.foundation.layout.padding
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import androidx.compose.foundation.layout.safeDrawingPadding
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import androidx.compose.foundation.layout.statusBarsPadding
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import androidx.compose.foundation.layout.wrapContentWidth
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import androidx.compose.foundation.rememberScrollState
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import androidx.compose.foundation.layout.*
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import androidx.compose.foundation.text.KeyboardOptions
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import androidx.compose.foundation.verticalScroll
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import androidx.compose.material3.Icon
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import androidx.compose.material3.MaterialTheme
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import androidx.compose.material3.Surface
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import androidx.compose.material3.Switch
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import androidx.compose.material3.Text
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import androidx.compose.material3.TextField
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import androidx.compose.runtime.Composable
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import androidx.compose.runtime.getValue
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import androidx.compose.runtime.mutableStateOf
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import androidx.compose.runtime.remember
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import androidx.compose.runtime.setValue
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import androidx.compose.material3.*
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import androidx.compose.runtime.*
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import androidx.compose.ui.Alignment
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import androidx.compose.ui.Modifier
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import androidx.compose.ui.res.painterResource
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import androidx.compose.ui.res.stringResource
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import androidx.compose.ui.text.input.ImeAction
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import androidx.compose.ui.text.input.KeyboardType
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import androidx.compose.ui.tooling.preview.Preview
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import androidx.compose.ui.unit.dp
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import com.example.tiptime.ui.theme.TipTimeTheme
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import java.text.NumberFormat
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/**
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* BMI Calculator Application
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*
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* NPM: [202310715051]
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* Nama: [Dendi Yogia Pratama]
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*/
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class MainActivity : ComponentActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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enableEdgeToEdge()
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super.onCreate(savedInstanceState)
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enableEdgeToEdge()
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setContent {
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TipTimeTheme {
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Surface(
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modifier = Modifier.fillMaxSize(),
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color = MaterialTheme.colorScheme.background
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) {
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TipTimeLayout()
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BMICalculatorLayout()
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}
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}
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}
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}
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}
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/**
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* Data class untuk menyimpan hasil kalkulasi BMI
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*/
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data class BMIResult(
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val bmiValue: Double,
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val category: String,
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val isValid: Boolean = true,
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val errorMessage: String = ""
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)
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/**
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* Composable untuk switch pemilihan unit sistem (USC/SI)
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*/
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@Composable
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fun TipTimeLayout() {
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var amountInput by remember { mutableStateOf("") }
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var tipInput by remember { mutableStateOf("") }
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var roundUp by remember { mutableStateOf(false) }
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val BmiHeight = amountInput.toDoubleOrNull() ?: 0.0
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val BmiWeight = tipInput.toDoubleOrNull() ?: 0.0
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val bmi = calculateBMI(BmiHeight, BmiWeight, roundUp)
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val category = calculateBMICategory(BmiHeight, BmiWeight, roundUp)
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Column(
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modifier = Modifier
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.statusBarsPadding()
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.padding(horizontal = 40.dp)
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.verticalScroll(rememberScrollState())
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.safeDrawingPadding(),
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horizontalAlignment = Alignment.CenterHorizontally,
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verticalArrangement = Arrangement.Center
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) {
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Text(
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text = stringResource(R.string.calculate_tip),
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modifier = Modifier
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.padding(bottom = 16.dp, top = 40.dp)
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.align(alignment = Alignment.Start)
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)
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EditNumberField(
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label = R.string.height,
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leadingIcon = R.drawable.number,
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keyboardOptions = KeyboardOptions.Default.copy(
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keyboardType = KeyboardType.Number,
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imeAction = ImeAction.Next
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),
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value = amountInput,
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onValueChanged = { amountInput = it },
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modifier = Modifier.padding(bottom = 32.dp).fillMaxWidth(),
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)
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EditNumberField(
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label = R.string.weight,
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leadingIcon = R.drawable.number,
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keyboardOptions = KeyboardOptions.Default.copy(
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keyboardType = KeyboardType.Number,
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imeAction = ImeAction.Done
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),
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value = tipInput,
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onValueChanged = { tipInput = it },
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modifier = Modifier.padding(bottom = 32.dp).fillMaxWidth(),
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)
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RoundTheTipRow(
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roundUp = roundUp,
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onRoundUpChanged = { roundUp = it },
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modifier = Modifier.padding(bottom = 32.dp)
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)
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Text(
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text = stringResource(R.string.bmi_calculation, bmi),
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style = MaterialTheme.typography.displaySmall
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)
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Text(
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text = stringResource(R.string.bmi_category, category),
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style = MaterialTheme.typography.displaySmall
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)
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Spacer(modifier = Modifier.height(150.dp))
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}
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}
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@Composable
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fun EditNumberField(
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@StringRes label: Int,
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@DrawableRes leadingIcon: Int,
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keyboardOptions: KeyboardOptions,
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value: String,
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onValueChanged: (String) -> Unit,
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modifier: Modifier = Modifier
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) {
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TextField(
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value = value,
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singleLine = true,
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leadingIcon = { Icon(painter = painterResource(id = leadingIcon), null) },
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modifier = modifier,
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onValueChange = onValueChanged,
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label = { Text(stringResource(label)) },
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keyboardOptions = keyboardOptions
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)
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}
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@Composable
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fun RoundTheTipRow(
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roundUp: Boolean,
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onRoundUpChanged: (Boolean) -> Unit,
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fun UnitSystemSwitchRow(
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useUSC: Boolean,
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onUseUSCChanged: (Boolean) -> Unit,
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modifier: Modifier = Modifier
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) {
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Row(
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modifier = modifier.fillMaxWidth(),
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verticalAlignment = Alignment.CenterVertically
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) {
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Text(text = stringResource(R.string.use_usc))
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Text(text = "Use USC Units (lbs/inches)")
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Switch(
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modifier = Modifier
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.fillMaxWidth()
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.wrapContentWidth(Alignment.End),
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checked = roundUp,
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onCheckedChange = onRoundUpChanged
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checked = useUSC,
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onCheckedChange = onUseUSCChanged
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)
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}
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}
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/**
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* Calculates the BMI
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*
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* Catatan: tambahkan unit test untuk kalkulasi BMI ini
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*/
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private fun calculateBMI(BmiHeight: Double, BmiWeight: Double = 15.0, roundUp: Boolean): String {
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var bmi = BmiWeight / 100 * BmiHeight
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if (roundUp) {
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bmi = kotlin.math.ceil(bmi)
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}
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return NumberFormat.getNumberInstance().format(bmi)
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}
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/**
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* Calculates the BMI Category
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*
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* Catatan: tambahkan unit test untuk kalkulasi BMI ini
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* Main BMI Calculator Layout
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*/
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@Composable
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fun BMICalculatorLayout() {
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var heightInput by remember { mutableStateOf("") }
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var weightInput by remember { mutableStateOf("") }
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var useUSC by remember { mutableStateOf(false) }
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var bmiResult by remember { mutableStateOf<BMIResult?>(null) }
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private fun calculateBMICategory(BmiHeight: Double, BmiWeight: Double = 15.0, roundUp: Boolean): String {
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var bmi = BmiWeight / 100 * BmiHeight
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if (roundUp) {
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bmi = kotlin.math.ceil(bmi)
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Column(
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modifier = Modifier
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.padding(40.dp)
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.fillMaxWidth(),
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verticalArrangement = Arrangement.spacedBy(8.dp)
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) {
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Text(
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text = "BMI Calculator",
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style = MaterialTheme.typography.headlineMedium,
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modifier = Modifier.padding(bottom = 16.dp)
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)
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// Unit System Switch
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UnitSystemSwitchRow(
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useUSC = useUSC,
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onUseUSCChanged = { useUSC = it },
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modifier = Modifier.padding(vertical = 8.dp)
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)
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// Height Input
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OutlinedTextField(
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value = heightInput,
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onValueChange = { heightInput = it },
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label = {
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Text(if (useUSC) "Height (inches)" else "Height (meters)")
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},
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keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Decimal),
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modifier = Modifier.fillMaxWidth(),
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singleLine = true
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)
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// Weight Input
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OutlinedTextField(
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value = weightInput,
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onValueChange = { weightInput = it },
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label = {
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Text(if (useUSC) "Weight (lbs)" else "Weight (kg)")
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},
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keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Decimal),
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modifier = Modifier.fillMaxWidth(),
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singleLine = true
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)
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// Calculate Button
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Button(
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onClick = {
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val height = heightInput.toDoubleOrNull()
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val weight = weightInput.toDoubleOrNull()
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if (height != null && weight != null) {
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bmiResult = calculateBMI(height, weight, useUSC)
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} else {
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bmiResult = BMIResult(
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bmiValue = 0.0,
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category = "",
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isValid = false,
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errorMessage = "Please enter valid numbers"
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)
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}
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},
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modifier = Modifier
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.fillMaxWidth()
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.padding(top = 16.dp)
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) {
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Text("Calculate BMI")
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}
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// Display Result
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bmiResult?.let { result ->
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Card(
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modifier = Modifier
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.fillMaxWidth()
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.padding(top = 16.dp),
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colors = CardDefaults.cardColors(
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containerColor = if (result.isValid)
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MaterialTheme.colorScheme.primaryContainer
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else
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MaterialTheme.colorScheme.errorContainer
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)
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) {
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Column(
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modifier = Modifier.padding(16.dp)
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) {
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if (result.isValid) {
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Text(
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text = "Your BMI: ${formatBMIResult(result)}",
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style = MaterialTheme.typography.titleLarge
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)
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Text(
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text = "Category: ${result.category}",
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style = MaterialTheme.typography.bodyLarge,
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modifier = Modifier.padding(top = 8.dp)
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)
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// BMI Info
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Spacer(modifier = Modifier.height(8.dp))
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Text(
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text = getBMICategoryInfo(result.category),
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style = MaterialTheme.typography.bodyMedium,
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color = MaterialTheme.colorScheme.onPrimaryContainer
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)
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} else {
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Text(
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text = "Error: ${result.errorMessage}",
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style = MaterialTheme.typography.bodyLarge,
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color = MaterialTheme.colorScheme.error
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)
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}
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}
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}
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}
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}
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return NumberFormat.getNumberInstance().format(bmi)
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}
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/**
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* Memvalidasi input tinggi dan berat badan
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*/
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fun validateBMIInput(height: Double, weight: Double, useUSC: Boolean): Pair<Boolean, String> {
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if (!useUSC) {
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// SI Units validation
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when {
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height <= 0 -> return Pair(false, "Tinggi harus lebih dari 0")
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height < 0.5 -> return Pair(false, "Tinggi terlalu rendah (minimum 0.5m)")
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height > 3.0 -> return Pair(false, "Tinggi tidak wajar (maksimum 3.0m)")
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weight <= 0 -> return Pair(false, "Berat harus lebih dari 0")
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weight < 20 -> return Pair(false, "Berat terlalu rendah (minimum 20kg)")
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weight > 500 -> return Pair(false, "Berat tidak wajar (maksimum 500kg)")
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}
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} else {
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// USC Units validation
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when {
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height <= 0 -> return Pair(false, "Height must be greater than 0")
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height < 20 -> return Pair(false, "Height too low (minimum 20 inches)")
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height > 120 -> return Pair(false, "Height unrealistic (maximum 120 inches)")
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weight <= 0 -> return Pair(false, "Weight must be greater than 0")
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weight < 44 -> return Pair(false, "Weight too low (minimum 44 lbs)")
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weight > 1100 -> return Pair(false, "Weight unrealistic (maximum 1100 lbs)")
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}
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}
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return Pair(true, "")
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}
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/**
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* Menghitung BMI berdasarkan sistem unit yang dipilih
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*
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* Formula USC: BMI = 703 × (weight in lbs / height² in inches)
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* Formula SI: BMI = weight in kg / height² in meters
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*/
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fun calculateBMI(height: Double, weight: Double, useUSC: Boolean): BMIResult {
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// Validasi input
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val (isValid, errorMessage) = validateBMIInput(height, weight, useUSC)
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if (!isValid) {
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return BMIResult(
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bmiValue = 0.0,
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category = "",
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isValid = false,
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errorMessage = errorMessage
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)
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}
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// Kalkulasi BMI
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val bmi = if (useUSC) {
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// USC: BMI = 703 × (weight in lbs / height² in inches)
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703.0 * (weight / (height * height))
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} else {
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// SI: BMI = weight in kg / height² in meters
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weight / (height * height)
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}
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// Tentukan kategori BMI
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val category = getBMICategory(bmi)
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return BMIResult(
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bmiValue = bmi,
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category = category,
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isValid = true,
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errorMessage = ""
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)
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}
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/**
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* Menentukan kategori BMI berdasarkan standar WHO
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*/
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fun getBMICategory(bmi: Double): String {
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return when {
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bmi < 18.5 -> "Underweight"
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bmi < 25.0 -> "Normal weight"
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bmi < 30.0 -> "Overweight"
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else -> "Obese"
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}
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}
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/**
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* Memberikan informasi tambahan tentang kategori BMI
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*/
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fun getBMICategoryInfo(category: String): String {
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return when (category) {
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"Underweight" -> "BMI < 18.5: Berat badan kurang"
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"Normal weight" -> "BMI 18.5-24.9: Berat badan ideal"
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"Overweight" -> "BMI 25.0-29.9: Kelebihan berat badan"
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"Obese" -> "BMI ≥ 30.0: Obesitas"
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else -> ""
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}
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}
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/**
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* Format BMI result untuk ditampilkan
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*/
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fun formatBMIResult(result: BMIResult): String {
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return if (result.isValid) {
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NumberFormat.getNumberInstance().apply {
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minimumFractionDigits = 1
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maximumFractionDigits = 1
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}.format(result.bmiValue)
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} else {
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result.errorMessage
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}
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}
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@Preview(showBackground = true)
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@Composable
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fun TipTimeLayoutPreview() {
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fun BMICalculatorPreview() {
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TipTimeTheme {
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TipTimeLayout()
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BMICalculatorLayout()
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}
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}
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