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‎app/build.gradle.kts‎

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plugins {
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alias(libs.plugins.android.application)
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alias(libs.plugins.kotlin.android)
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alias(libs.plugins.kotlin.compose)
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}
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android {
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namespace = "com.example.lintexercise"
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compileSdk = 36
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defaultConfig {
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applicationId = "com.example.lintexercise"
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minSdk = 24
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targetSdk = 36
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versionCode = 1
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versionName = "1.0"
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testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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isMinifyEnabled = false
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proguardFiles(
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getDefaultProguardFile("proguard-android-optimize.txt"),
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"proguard-rules.pro"
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)
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_11
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targetCompatibility = JavaVersion.VERSION_11
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}
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kotlinOptions {
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jvmTarget = "11"
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}
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buildFeatures {
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compose = true
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}
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}
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dependencies {
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implementation(libs.androidx.core.ktx)
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implementation(libs.androidx.lifecycle.runtime.ktx)
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implementation(libs.androidx.activity.compose)
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implementation(platform(libs.androidx.compose.bom))
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implementation(libs.androidx.ui)
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implementation(libs.androidx.ui.graphics)
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implementation(libs.androidx.ui.tooling.preview)
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implementation(libs.androidx.material3)
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testImplementation(libs.junit)
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androidTestImplementation(libs.androidx.junit)
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androidTestImplementation(libs.androidx.espresso.core)
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androidTestImplementation(platform(libs.androidx.compose.bom))
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androidTestImplementation(libs.androidx.ui.test.junit4)
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debugImplementation(libs.androidx.ui.tooling)
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debugImplementation(libs.androidx.ui.test.manifest)
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}

‎app/proguard-rules.pro‎

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

‎app/src/androidTest/java/com/example/lintexercise/ExampleInstrumentedTest.kt‎

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

‎app/src/main/AndroidManifest.xml‎

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

‎app/src/main/java/com/example/lintexercise/MainActivity.kt‎

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package com.example.lintexercise
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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.compose.material3.Text
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import androidx.compose.material3.MaterialTheme
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class MainActivity : ComponentActivity() {
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// ❌ Lint: Class body should not start with a blank line
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// (→ remove the empty line below this line)
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContent {
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// ❌ Lint issues:
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// - Missing newline after "("
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// - Each argument should be on a separate line
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// - Unexpected indentation (should be 16 spaces)
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// - Missing newline before ")"
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// - Missing trailing comma before ")"
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// - Trailing spaces detected
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Text(text = "Hello", // ← Arguments should not start on the same line as the function call
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style = MaterialTheme.typography.bodyLarge, // ← Incorrect indentation
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maxLines = 1) // ← Missing newline and trailing comma before ")"
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// ✅ Correct formatting:
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Text(
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text = "Hello",
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style = MaterialTheme.typography.bodyLarge,
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maxLines = 1,
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)
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}
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}
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}

‎app/src/main/java/com/example/lintexercise/ui/theme/Color.kt‎

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

‎app/src/main/java/com/example/lintexercise/ui/theme/Theme.kt‎

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

‎app/src/main/java/com/example/lintexercise/ui/theme/Type.kt‎

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

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