├── .gitignore ├── .idea ├── .gitignore ├── .name ├── compiler.xml ├── deploymentTargetDropDown.xml ├── gradle.xml ├── misc.xml └── sonarlint │ └── issuestore │ └── index.pb ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── plcoding │ │ └── kotlinflows │ │ └── ExampleInstrumentedTest.kt │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── plcoding │ │ │ └── kotlinflows │ │ │ ├── DispatcherProvider.kt │ │ │ ├── MainActivity.kt │ │ │ ├── MainViewModel.kt │ │ │ └── ui │ │ │ └── theme │ │ │ ├── Color.kt │ │ │ ├── Shape.kt │ │ │ ├── Theme.kt │ │ │ └── Type.kt │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ └── ic_launcher_background.xml │ │ ├── mipmap-anydpi-v26 │ │ ├── ic_launcher.xml │ │ └── ic_launcher_round.xml │ │ ├── mipmap-hdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-mdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-xhdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-xxhdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── mipmap-xxxhdpi │ │ ├── ic_launcher.webp │ │ └── ic_launcher_round.webp │ │ ├── values-night │ │ └── themes.xml │ │ └── values │ │ ├── colors.xml │ │ ├── strings.xml │ │ └── themes.xml │ └── test │ └── java │ └── com │ └── plcoding │ └── kotlinflows │ ├── ExampleUnitTest.kt │ ├── MainViewModelTest.kt │ └── TestDispatchers.kt ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | .cxx 15 | local.properties 16 | -------------------------------------------------------------------------------- /.idea/.gitignore: -------------------------------------------------------------------------------- 1 | # Default ignored files 2 | /shelf/ 3 | /workspace.xml 4 | -------------------------------------------------------------------------------- /.idea/.name: -------------------------------------------------------------------------------- 1 | KotlinFlows -------------------------------------------------------------------------------- /.idea/compiler.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/deploymentTargetDropDown.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 19 | 20 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 9 | -------------------------------------------------------------------------------- /.idea/sonarlint/issuestore/index.pb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/philipplackner/KotlinFlowsGuide/cb1a28bb79701dd52b7cbdd553bfa50fce6c9a16/.idea/sonarlint/issuestore/index.pb -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | id 'com.android.application' 3 | id 'kotlin-android' 4 | } 5 | 6 | android { 7 | compileSdk 31 8 | 9 | defaultConfig { 10 | applicationId "com.plcoding.kotlinflows" 11 | minSdk 21 12 | targetSdk 31 13 | versionCode 1 14 | versionName "1.0" 15 | 16 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 17 | vectorDrawables { 18 | useSupportLibrary true 19 | } 20 | } 21 | 22 | buildTypes { 23 | release { 24 | minifyEnabled false 25 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 26 | } 27 | } 28 | compileOptions { 29 | sourceCompatibility JavaVersion.VERSION_1_8 30 | targetCompatibility JavaVersion.VERSION_1_8 31 | } 32 | kotlinOptions { 33 | jvmTarget = '1.8' 34 | useIR = true 35 | } 36 | buildFeatures { 37 | compose true 38 | } 39 | composeOptions { 40 | kotlinCompilerExtensionVersion compose_version 41 | kotlinCompilerVersion '1.5.21' 42 | } 43 | packagingOptions { 44 | resources { 45 | excludes += '/META-INF/{AL2.0,LGPL2.1}' 46 | } 47 | } 48 | } 49 | 50 | dependencies { 51 | 52 | implementation 'androidx.core:core-ktx:1.7.0' 53 | implementation 'androidx.appcompat:appcompat:1.4.0' 54 | implementation 'com.google.android.material:material:1.4.0' 55 | implementation "androidx.compose.ui:ui:$compose_version" 56 | implementation "androidx.compose.material:material:$compose_version" 57 | implementation "androidx.compose.ui:ui-tooling-preview:$compose_version" 58 | implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.4.0' 59 | implementation 'androidx.activity:activity-compose:1.4.0' 60 | testImplementation 'junit:junit:4.+' 61 | androidTestImplementation 'androidx.test.ext:junit:1.1.3' 62 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0' 63 | androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version" 64 | debugImplementation "androidx.compose.ui:ui-tooling:$compose_version" 65 | 66 | implementation "androidx.lifecycle:lifecycle-viewmodel-compose:2.4.0" 67 | 68 | testImplementation 'app.cash.turbine:turbine:0.7.0' 69 | testImplementation "com.google.truth:truth:1.1.3" 70 | testImplementation "org.jetbrains.kotlinx:kotlinx-coroutines-test:1.5.1" 71 | } -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile -------------------------------------------------------------------------------- /app/src/androidTest/java/com/plcoding/kotlinflows/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.plcoding.kotlinflows", appContext.packageName) 23 | } 24 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/DispatcherProvider.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows 2 | 3 | import kotlinx.coroutines.CoroutineDispatcher 4 | import kotlinx.coroutines.Dispatchers 5 | 6 | interface DispatcherProvider { 7 | val main: CoroutineDispatcher 8 | val io: CoroutineDispatcher 9 | val default: CoroutineDispatcher 10 | } 11 | 12 | class DefaultDispatchers: DispatcherProvider { 13 | override val main: CoroutineDispatcher 14 | get() = Dispatchers.Main 15 | override val io: CoroutineDispatcher 16 | get() = Dispatchers.IO 17 | override val default: CoroutineDispatcher 18 | get() = Dispatchers.Default 19 | } -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows 2 | 3 | import android.os.Bundle 4 | import androidx.activity.ComponentActivity 5 | import androidx.activity.compose.setContent 6 | import androidx.activity.viewModels 7 | import androidx.compose.foundation.layout.Box 8 | import androidx.compose.foundation.layout.fillMaxSize 9 | import androidx.compose.material.Button 10 | import androidx.compose.material.MaterialTheme 11 | import androidx.compose.material.Surface 12 | import androidx.compose.material.Text 13 | import androidx.compose.runtime.Composable 14 | import androidx.compose.runtime.LaunchedEffect 15 | import androidx.compose.runtime.collectAsState 16 | import androidx.compose.ui.Alignment 17 | import androidx.compose.ui.Modifier 18 | import androidx.compose.ui.tooling.preview.Preview 19 | import androidx.compose.ui.unit.sp 20 | import androidx.lifecycle.Lifecycle 21 | import androidx.lifecycle.lifecycleScope 22 | import androidx.lifecycle.repeatOnLifecycle 23 | import androidx.lifecycle.viewmodel.compose.viewModel 24 | import com.plcoding.kotlinflows.ui.theme.KotlinFlowsTheme 25 | import kotlinx.coroutines.flow.Flow 26 | import kotlinx.coroutines.flow.collect 27 | import kotlinx.coroutines.flow.collectLatest 28 | import kotlinx.coroutines.launch 29 | 30 | class MainActivity : ComponentActivity() { 31 | 32 | private val viewModel: MainViewModel by viewModels() 33 | 34 | override fun onCreate(savedInstanceState: Bundle?) { 35 | super.onCreate(savedInstanceState) 36 | collectLatestLifecycleFlow(viewModel.stateFlow) { number -> 37 | 38 | } 39 | setContent { 40 | KotlinFlowsTheme { 41 | val viewModel = viewModel() 42 | val count = viewModel.stateFlow.collectAsState(initial = 0) 43 | 44 | LaunchedEffect(key1 = true) { 45 | viewModel.sharedFlow.collect { number -> 46 | 47 | } 48 | } 49 | 50 | Box(modifier = Modifier.fillMaxSize()) { 51 | Button(onClick = { viewModel.incrementCounter() }) { 52 | Text(text = "Counter: ${count.value}") 53 | } 54 | } 55 | } 56 | } 57 | } 58 | } 59 | 60 | fun ComponentActivity.collectLatestLifecycleFlow(flow: Flow, collect: suspend (T) -> Unit) { 61 | lifecycleScope.launch { 62 | repeatOnLifecycle(Lifecycle.State.STARTED) { 63 | flow.collectLatest(collect) 64 | } 65 | } 66 | } 67 | 68 | fun ComponentActivity.collectLifecycleFlow(flow: Flow, collect: suspend (T) -> Unit) { 69 | lifecycleScope.launch { 70 | repeatOnLifecycle(Lifecycle.State.STARTED) { 71 | flow.collect(collect) 72 | } 73 | } 74 | } -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/MainViewModel.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows 2 | 3 | import androidx.lifecycle.ViewModel 4 | import androidx.lifecycle.viewModelScope 5 | import kotlinx.coroutines.delay 6 | import kotlinx.coroutines.flow.* 7 | import kotlinx.coroutines.launch 8 | 9 | class MainViewModel( 10 | private val dispatchers: DispatcherProvider 11 | ) : ViewModel() { 12 | 13 | val countDownFlow = flow { 14 | val startingValue = 5 15 | var currentValue = startingValue 16 | emit(startingValue) 17 | while (currentValue > 0) { 18 | delay(1000L) 19 | currentValue-- 20 | emit(currentValue) 21 | } 22 | }.flowOn(dispatchers.main) 23 | 24 | private val _stateFlow = MutableStateFlow(0) 25 | val stateFlow = _stateFlow.asStateFlow() 26 | 27 | private val _sharedFlow = MutableSharedFlow(replay = 5) 28 | val sharedFlow = _sharedFlow.asSharedFlow() 29 | 30 | init { 31 | squareNumber(3) 32 | viewModelScope.launch(dispatchers.main) { 33 | sharedFlow.collect { 34 | delay(2000L) 35 | println("FIRST FLOW: The received number is $it") 36 | } 37 | } 38 | viewModelScope.launch(dispatchers.main) { 39 | sharedFlow.collect { 40 | delay(3000L) 41 | println("SECOND FLOW: The received number is $it") 42 | } 43 | } 44 | } 45 | 46 | fun squareNumber(number: Int) { 47 | viewModelScope.launch(dispatchers.main) { 48 | _sharedFlow.emit(number * number) 49 | } 50 | } 51 | 52 | fun incrementCounter() { 53 | _stateFlow.value += 1 54 | } 55 | 56 | private fun collectFlow() { 57 | val flow = flow { 58 | delay(250L) 59 | emit("Appetizer") 60 | delay(1000L) 61 | emit("Main dish") 62 | delay(100L) 63 | emit("Dessert") 64 | } 65 | viewModelScope.launch { 66 | flow.onEach { 67 | println("FLOW: $it is delivered") 68 | } 69 | .collectLatest { 70 | println("FLOW: Now eating $it") 71 | delay(1500L) 72 | println("FLOW: Finished eating $it") 73 | } 74 | } 75 | } 76 | } -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/ui/theme/Color.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows.ui.theme 2 | 3 | import androidx.compose.ui.graphics.Color 4 | 5 | val Purple200 = Color(0xFFBB86FC) 6 | val Purple500 = Color(0xFF6200EE) 7 | val Purple700 = Color(0xFF3700B3) 8 | val Teal200 = Color(0xFF03DAC5) -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/ui/theme/Shape.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows.ui.theme 2 | 3 | import androidx.compose.foundation.shape.RoundedCornerShape 4 | import androidx.compose.material.Shapes 5 | import androidx.compose.ui.unit.dp 6 | 7 | val Shapes = Shapes( 8 | small = RoundedCornerShape(4.dp), 9 | medium = RoundedCornerShape(4.dp), 10 | large = RoundedCornerShape(0.dp) 11 | ) -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/ui/theme/Theme.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows.ui.theme 2 | 3 | import androidx.compose.foundation.isSystemInDarkTheme 4 | import androidx.compose.material.MaterialTheme 5 | import androidx.compose.material.darkColors 6 | import androidx.compose.material.lightColors 7 | import androidx.compose.runtime.Composable 8 | 9 | private val DarkColorPalette = darkColors( 10 | primary = Purple200, 11 | primaryVariant = Purple700, 12 | secondary = Teal200 13 | ) 14 | 15 | private val LightColorPalette = lightColors( 16 | primary = Purple500, 17 | primaryVariant = Purple700, 18 | secondary = Teal200 19 | 20 | /* Other default colors to override 21 | background = Color.White, 22 | surface = Color.White, 23 | onPrimary = Color.White, 24 | onSecondary = Color.Black, 25 | onBackground = Color.Black, 26 | onSurface = Color.Black, 27 | */ 28 | ) 29 | 30 | @Composable 31 | fun KotlinFlowsTheme(darkTheme: Boolean = isSystemInDarkTheme(), content: @Composable() () -> Unit) { 32 | val colors = if (darkTheme) { 33 | DarkColorPalette 34 | } else { 35 | LightColorPalette 36 | } 37 | 38 | MaterialTheme( 39 | colors = colors, 40 | typography = Typography, 41 | shapes = Shapes, 42 | content = content 43 | ) 44 | } -------------------------------------------------------------------------------- /app/src/main/java/com/plcoding/kotlinflows/ui/theme/Type.kt: -------------------------------------------------------------------------------- 1 | package com.plcoding.kotlinflows.ui.theme 2 | 3 | import androidx.compose.material.Typography 4 | import androidx.compose.ui.text.TextStyle 5 | import androidx.compose.ui.text.font.FontFamily 6 | import androidx.compose.ui.text.font.FontWeight 7 | import androidx.compose.ui.unit.sp 8 | 9 | // Set of Material typography styles to start with 10 | val Typography = Typography( 11 | body1 = TextStyle( 12 | fontFamily = FontFamily.Default, 13 | fontWeight = FontWeight.Normal, 14 | fontSize = 16.sp 15 | ) 16 | /* Other default text styles to override 17 | button = TextStyle( 18 | fontFamily = FontFamily.Default, 19 | fontWeight = FontWeight.W500, 20 | fontSize = 14.sp 21 | ), 22 | caption = TextStyle( 23 | fontFamily = FontFamily.Default, 24 | fontWeight = FontWeight.Normal, 25 | fontSize = 12.sp 26 | ) 27 | */ 28 | ) -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 8 | 9 | 15 | 18 | 21 | 22 | 23 | 24 | 30 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: 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/app/src/main/res/values-night/themes.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 16 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #FFBB86FC 4 | #FF6200EE 5 | #FF3700B3 6 | #FF03DAC5 7 | #FF018786 8 | #FF000000 9 | #FFFFFFFF 10 | -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | KotlinFlows 3 | -------------------------------------------------------------------------------- /app/src/main/res/values/themes.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 16 | 17 | 21 | 22 |