FastNotes app made in Kotlin

This commit is contained in:
Christopher Sanden
2026-02-28 23:11:51 +01:00
parent 31e8ece40d
commit 820451c7e1
56 changed files with 1499 additions and 0 deletions

1
FastNotesKotlin/app/.gitignore vendored Normal file
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/build

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plugins {
alias(libs.plugins.android.application)
alias(libs.plugins.kotlin.compose)
}
android {
namespace = "com.example.fastnotes_kotlin"
compileSdk {
version = release(36) {
minorApiLevel = 1
}
}
defaultConfig {
applicationId = "com.example.fastnotes_kotlin"
minSdk = 36
targetSdk = 36
versionCode = 1
versionName = "1.0"
testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
isMinifyEnabled = false
proguardFiles(
getDefaultProguardFile("proguard-android-optimize.txt"),
"proguard-rules.pro"
)
}
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_11
targetCompatibility = JavaVersion.VERSION_11
}
buildFeatures {
compose = true
}
}
dependencies {
implementation(libs.androidx.core.ktx)
implementation(libs.androidx.lifecycle.runtime.ktx)
implementation(libs.androidx.activity.compose)
implementation(platform(libs.androidx.compose.bom))
implementation(libs.androidx.compose.ui)
implementation(libs.androidx.compose.ui.graphics)
implementation(libs.androidx.compose.ui.tooling.preview)
implementation(libs.androidx.compose.material3)
implementation(libs.androidx.navigation.compose)
testImplementation(libs.junit)
androidTestImplementation(libs.androidx.junit)
androidTestImplementation(libs.androidx.espresso.core)
androidTestImplementation(platform(libs.androidx.compose.bom))
androidTestImplementation(libs.androidx.compose.ui.test.junit4)
debugImplementation(libs.androidx.compose.ui.tooling)
debugImplementation(libs.androidx.compose.ui.test.manifest)
}

21
FastNotesKotlin/app/proguard-rules.pro vendored Normal file
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# Add project specific ProGuard rules here.
# You can control the set of applied configuration files using the
# proguardFiles setting in build.gradle.
#
# For more details, see
# http://developer.android.com/guide/developing/tools/proguard.html
# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
# public *;
#}
# Uncomment this to preserve the line number information for
# debugging stack traces.
#-keepattributes SourceFile,LineNumberTable
# If you keep the line number information, uncomment this to
# hide the original source file name.
#-renamesourcefileattribute SourceFile

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package com.example.fastnotes_kotlin
import androidx.test.platform.app.InstrumentationRegistry
import androidx.test.ext.junit.runners.AndroidJUnit4
import org.junit.Test
import org.junit.runner.RunWith
import org.junit.Assert.*
/**
* Instrumented test, which will execute on an Android device.
*
* See [testing documentation](http://d.android.com/tools/testing).
*/
@RunWith(AndroidJUnit4::class)
class ExampleInstrumentedTest {
@Test
fun useAppContext() {
// Context of the app under test.
val appContext = InstrumentationRegistry.getInstrumentation().targetContext
assertEquals("com.example.fastnotes_kotlin", appContext.packageName)
}
}

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<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.FastNotesKotlin">
<activity
android:name=".MainActivity"
android:exported="true"
android:label="@string/app_name"
android:theme="@style/Theme.FastNotesKotlin">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

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package com.example.fastnotes_kotlin
import android.graphics.Outline
import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.lazy.LazyColumn
import androidx.compose.material3.FloatingActionButton
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import com.example.fastnotes_kotlin.ui.theme.FastNotesKotlinTheme
import androidx.compose.foundation.lazy.items
import androidx.compose.material3.*
import androidx.compose.foundation.layout.*
import androidx.navigation.NavType
import androidx.navigation.compose.NavHost
import androidx.navigation.compose.rememberNavController
import androidx.navigation.navArgument
import androidx.navigation.compose.composable
import androidx.compose.foundation.clickable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.runtime.setValue
import androidx.lifecycle.viewmodel.compose.viewModel
class MainActivity : ComponentActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
enableEdgeToEdge()
setContent {
FastNotesKotlinTheme {
FastNotesApp()
}
}
}
}
@Composable
fun FastNotesApp() {
val navController = rememberNavController()
val vm: NotesViewModel = viewModel()
NavHost(navController = navController, startDestination = Routes.LIST) {
composable(Routes.LIST) {
NotesListScreen(
notes = vm.notes,
onAddClick = { navController.navigate(Routes.NEW) },
onNoteClick = { id -> navController.navigate(Routes.details(id)) }
)
}
composable(Routes.NEW) {
NewNotesScreen(
onSave = { title, content ->
vm.addNote(title, content)
navController.popBackStack()
},
onCancel = { navController.popBackStack() }
)
}
composable(route = Routes.DETAILS,
arguments = listOf(navArgument("noteId") { type = NavType.LongType }))
{
entry ->
val noteId = entry.arguments?.getLong("noteId") ?: -1L
val note = vm.getNote(noteId)
NoteDetailsScreen(note = note, onBack = { navController.popBackStack() })
}
}
}
@Composable
fun NotesListScreen(notes: List<Note>, onAddClick: () -> Unit, onNoteClick: (Long) -> Unit) {
Scaffold(
floatingActionButton = {
FloatingActionButton(onClick = onAddClick,
modifier = Modifier.offset(x = (-26).dp, y = (-16).dp)
){
Text("+")
}
}
) {padding ->
LazyColumn(modifier = Modifier.padding(padding)) {
items(notes){ note ->
Text(
text = note.title,
modifier = Modifier
.fillParentMaxWidth()
.clickable { onNoteClick(note.id) }
.padding(16.dp)
)
}
}
}
}
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun NewNotesScreen(onSave: (String, String) -> Unit, onCancel: () -> Unit) {
var title by remember { mutableStateOf("") }
var content by remember { mutableStateOf("") }
Scaffold(
topBar = { TopAppBar(title = { Text("New note") }) }
) { padding ->
Column(modifier = Modifier
.padding(padding)
.padding(16.dp),
verticalArrangement = Arrangement.spacedBy(12.dp))
{
OutlinedTextField(value = title, onValueChange = { title = it },
label = { Text("Title")}, modifier = Modifier.fillMaxWidth())
OutlinedTextField(value = content, onValueChange = { content = it},
label = { Text("Content")}, modifier = Modifier.fillMaxWidth(),
minLines = 5)
Button(onClick = { onSave(title, content) }) { Text("Save") }
OutlinedButton(onCancel) { Text("Cancel") }
}
}
}
@OptIn(ExperimentalMaterial3Api::class)
@Composable
fun NoteDetailsScreen(note: Note?, onBack: () -> Unit) {
Scaffold(
topBar = {
TopAppBar(
title = { Text("Details") },
navigationIcon = {
TextButton(onBack) { Text("Back") }
}
)
}
) { padding ->
Column(modifier = Modifier
.padding(padding)
.padding(16.dp),
verticalArrangement = Arrangement.spacedBy(8.dp)) {
if (note == null){
Text("Note not found")
}
else{
Text(note.title, style = MaterialTheme.typography.titleLarge)
Text(note.content)
}
}
}
}

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package com.example.fastnotes_kotlin
data class Note(
val id: Long,
val title: String,
val content: String
)

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package com.example.fastnotes_kotlin
import androidx.compose.runtime.mutableStateListOf
import androidx.lifecycle.ViewModel
class NotesViewModel : ViewModel() {
val notes = mutableStateListOf(
Note(1, "First note", "This is my first note"),
Note(2, "Second note", "This is my second note")
)
fun addNote(title: String, content: String) {
val nextId = (notes.maxOfOrNull { it.id } ?: 0L) + 1L
notes.add(Note(nextId, title, content))
}
fun getNote(id: Long): Note? = notes.find { it.id == id }
}

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package com.example.fastnotes_kotlin
object Routes {
const val LIST = "list"
const val NEW = "new"
const val DETAILS = "details/{noteId}"
fun details(noteId: Long) = "details/$noteId"
}

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package com.example.fastnotes_kotlin.ui.theme
import androidx.compose.ui.graphics.Color
val Purple80 = Color(0xFFD0BCFF)
val PurpleGrey80 = Color(0xFFCCC2DC)
val Pink80 = Color(0xFFEFB8C8)
val Purple40 = Color(0xFF6650a4)
val PurpleGrey40 = Color(0xFF625b71)
val Pink40 = Color(0xFF7D5260)

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package com.example.fastnotes_kotlin.ui.theme
import android.app.Activity
import android.os.Build
import androidx.compose.foundation.isSystemInDarkTheme
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.darkColorScheme
import androidx.compose.material3.dynamicDarkColorScheme
import androidx.compose.material3.dynamicLightColorScheme
import androidx.compose.material3.lightColorScheme
import androidx.compose.runtime.Composable
import androidx.compose.ui.platform.LocalContext
private val DarkColorScheme = darkColorScheme(
primary = Purple80,
secondary = PurpleGrey80,
tertiary = Pink80
)
private val LightColorScheme = lightColorScheme(
primary = Purple40,
secondary = PurpleGrey40,
tertiary = Pink40
/* Other default colors to override
background = Color(0xFFFFFBFE),
surface = Color(0xFFFFFBFE),
onPrimary = Color.White,
onSecondary = Color.White,
onTertiary = Color.White,
onBackground = Color(0xFF1C1B1F),
onSurface = Color(0xFF1C1B1F),
*/
)
@Composable
fun FastNotesKotlinTheme(
darkTheme: Boolean = isSystemInDarkTheme(),
// Dynamic color is available on Android 12+
dynamicColor: Boolean = true,
content: @Composable () -> Unit
) {
val colorScheme = when {
dynamicColor && Build.VERSION.SDK_INT >= Build.VERSION_CODES.S -> {
val context = LocalContext.current
if (darkTheme) dynamicDarkColorScheme(context) else dynamicLightColorScheme(context)
}
darkTheme -> DarkColorScheme
else -> LightColorScheme
}
MaterialTheme(
colorScheme = colorScheme,
typography = Typography,
content = content
)
}

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package com.example.fastnotes_kotlin.ui.theme
import androidx.compose.material3.Typography
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.text.font.FontFamily
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.unit.sp
// Set of Material typography styles to start with
val Typography = Typography(
bodyLarge = TextStyle(
fontFamily = FontFamily.Default,
fontWeight = FontWeight.Normal,
fontSize = 16.sp,
lineHeight = 24.sp,
letterSpacing = 0.5.sp
)
/* Other default text styles to override
titleLarge = TextStyle(
fontFamily = FontFamily.Default,
fontWeight = FontWeight.Normal,
fontSize = 22.sp,
lineHeight = 28.sp,
letterSpacing = 0.sp
),
labelSmall = TextStyle(
fontFamily = FontFamily.Default,
fontWeight = FontWeight.Medium,
fontSize = 11.sp,
lineHeight = 16.sp,
letterSpacing = 0.5.sp
)
*/
)

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android:width="108dp"
android:height="108dp"
android:viewportWidth="108"
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<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
<background android:drawable="@drawable/ic_launcher_background" />
<foreground android:drawable="@drawable/ic_launcher_foreground" />
<monochrome android:drawable="@drawable/ic_launcher_foreground" />
</adaptive-icon>

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<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
<background android:drawable="@drawable/ic_launcher_background" />
<foreground android:drawable="@drawable/ic_launcher_foreground" />
<monochrome android:drawable="@drawable/ic_launcher_foreground" />
</adaptive-icon>

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<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="purple_200">#FFBB86FC</color>
<color name="purple_500">#FF6200EE</color>
<color name="purple_700">#FF3700B3</color>
<color name="teal_200">#FF03DAC5</color>
<color name="teal_700">#FF018786</color>
<color name="black">#FF000000</color>
<color name="white">#FFFFFFFF</color>
</resources>

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<resources>
<string name="app_name">FastNotes - Kotlin</string>
</resources>

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<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.FastNotesKotlin" parent="android:Theme.Material.Light.NoActionBar" />
</resources>

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<?xml version="1.0" encoding="utf-8"?><!--
Sample backup rules file; uncomment and customize as necessary.
See https://developer.android.com/guide/topics/data/autobackup
for details.
Note: This file is ignored for devices older than API 31
See https://developer.android.com/about/versions/12/backup-restore
-->
<full-backup-content>
<!--
<include domain="sharedpref" path="."/>
<exclude domain="sharedpref" path="device.xml"/>
-->
</full-backup-content>

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<?xml version="1.0" encoding="utf-8"?><!--
Sample data extraction rules file; uncomment and customize as necessary.
See https://developer.android.com/about/versions/12/backup-restore#xml-changes
for details.
-->
<data-extraction-rules>
<cloud-backup>
<!-- TODO: Use <include> and <exclude> to control what is backed up.
<include .../>
<exclude .../>
-->
</cloud-backup>
<!--
<device-transfer>
<include .../>
<exclude .../>
</device-transfer>
-->
</data-extraction-rules>

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package com.example.fastnotes_kotlin
import org.junit.Test
import org.junit.Assert.*
/**
* Example local unit test, which will execute on the development machine (host).
*
* See [testing documentation](http://d.android.com/tools/testing).
*/
class ExampleUnitTest {
@Test
fun addition_isCorrect() {
assertEquals(4, 2 + 2)
}
}