Initial support for compose multiplatform

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

Author: theimpulson

build.gradle.kts

@@ -5,8 +5,13 @@
 
 plugins {
     alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.android.library) apply false
     alias(libs.plugins.jetbrains.kotlin.android) apply false
     alias(libs.plugins.jetbrains.kotlin.kapt) apply false
+    alias(libs.plugins.jetbrains.kotlin.compose) apply false
+    alias(libs.plugins.jetbrains.kotlin.multiplatform) apply false
+    alias(libs.plugins.jetbrains.compose.multiplatform) apply false
+    alias(libs.plugins.jetbrains.compose.hotreload) apply false
     alias(libs.plugins.google.ksp) apply false
     alias(libs.plugins.jetbrains.kotlin.parcelize) apply false
     alias(libs.plugins.sonarqube) apply false

composeApp/build.gradle.kts

@@ -0,0 +1,73 @@
+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+import org.jetbrains.compose.desktop.application.dsl.TargetFormat
+
+plugins {
+    alias(libs.plugins.android.library)
+    alias(libs.plugins.jetbrains.kotlin.multiplatform)
+    alias(libs.plugins.jetbrains.kotlin.compose)
+    alias(libs.plugins.jetbrains.compose.multiplatform)
+    alias(libs.plugins.jetbrains.compose.hotreload)
+    alias(libs.plugins.google.ksp)
+    alias(libs.plugins.jetbrains.kotlin.parcelize)
+}
+
+kotlin {
+    jvmToolchain(17)
+
+    androidLibrary {
+        namespace = "net.newpipe.app"
+        compileSdk = 36
+        minSdk = 21
+    }
+
+    listOf(
+        iosArm64(),
+        iosSimulatorArm64()
+    ).forEach { iosTarget ->
+        iosTarget.binaries.framework {
+            baseName = "ComposeApp"
+            isStatic = true
+        }
+    }
+
+    jvm()
+
+    sourceSets {
+        commonMain.dependencies {
+            implementation(compose.runtime)
+            implementation(compose.foundation)
+            implementation(compose.material3)
+            implementation(compose.ui)
+            implementation(compose.components.resources)
+            implementation(compose.components.uiToolingPreview)
+            implementation(libs.jetbrains.lifecycle.viewmodel)
+        }
+        commonTest.dependencies {
+            implementation(libs.kotlin.test)
+        }
+        androidMain.dependencies {
+            implementation(compose.preview)
+            implementation(libs.androidx.activity)
+        }
+        jvmMain.dependencies {
+            implementation(compose.desktop.currentOs)
+            implementation(libs.jetbrains.kotlinx.coroutinesSwing)
+        }
+    }
+}
+
+compose.desktop {
+    application {
+        mainClass = "net.newpipe.app.MainKt"
+
+        nativeDistributions {
+            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            packageName = "net.newpipe.app"
+            packageVersion = "1.0.0"
+        }
+    }
+}

composeApp/src/androidMain/AndroidManifest.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+  -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+        <activity
+            android:name="net.newpipe.app.ComposeActivity"
+            android:exported="false" />
+    </application>
+</manifest>

composeApp/src/androidMain/kotlin/net/newpipe/app/ComposeActivity.kt

@@ -0,0 +1,22 @@
+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import android.os.Bundle
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.activity.enableEdgeToEdge
+
+class ComposeActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        enableEdgeToEdge()
+        super.onCreate(savedInstanceState)
+
+        setContent {
+            App()
+        }
+    }
+}

composeApp/src/commonMain/composeResources/values/strings.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+  -->
+<resources>
+    <string name="app_name">NewPipe</string>
+</resources>

composeApp/src/commonMain/kotlin/net/newpipe/app/App.kt

@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.runtime.Composable
+import org.jetbrains.compose.ui.tooling.preview.Preview
+
+@Composable
+@Preview
+fun App() {
+    MaterialTheme {
+
+    }
+}

composeApp/src/commonTest/kotlin/net/newpipe/app/ComposeAppCommonTest.kt

@@ -0,0 +1,17 @@
+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+
+class ComposeAppCommonTest {
+
+    @Test
+    fun example() {
+        assertEquals(3, 1 + 2)
+    }
+}

composeApp/src/iosMain/kotlin/net/newpipe/app/MainViewController.kt

@@ -0,0 +1,10 @@
+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import androidx.compose.ui.window.ComposeUIViewController
+
+fun MainViewController() = ComposeUIViewController { App() }

composeApp/src/jvmMain/kotlin/net/newpipe/app/main.kt

@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: 2026 NewPipe e.V. <https://newpipe-ev.de>
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package net.newpipe.app
+
+import androidx.compose.ui.window.Window
+import androidx.compose.ui.window.application
+import newpipe.composeapp.generated.resources.Res
+import newpipe.composeapp.generated.resources.app_name
+import org.jetbrains.compose.resources.stringResource
+
+fun main() = application {
+    Window(onCloseRequest = ::exitApplication, title = stringResource(Res.string.app_name)) {
+        App()
+    }
+}

gradle/libs.versions.toml

@@ -5,6 +5,7 @@
 
 [versions]
 acra = "5.13.1"
+activity = "1.12.2"
 agp = "8.13.2"
 appcompat = "1.7.1"
 assertj = "3.27.6"
@@ -15,11 +16,13 @@ cardview = "1.0.0"
 checkstyle = "12.2.0"
 constraintlayout = "2.2.1"
 core = "1.17.0"
+coroutines = "1.10.2"
 desugar = "2.1.5"
 documentfile = "1.1.0"
 exoplayer = "2.19.1"
 fragment = "1.8.9"
 groupie = "2.10.1"
+hotreload = "1.0.0"
 jsoup = "1.21.2"
 junit = "4.13.2"
 junit-ext = "1.3.0"
@@ -28,11 +31,13 @@ ksp = "2.3.2"
 ktlint = "1.8.0"
 leakcanary = "2.14"
 lifecycle = "2.9.4" # Newer versions require minSdk >= 23
+lifecycle-jetbrains = "2.9.6"
 localbroadcastmanager = "1.1.0"
 markwon = "4.6.2"
 material = "1.13.0"
 media = "1.7.1"
 mockitoCore = "5.21.0"
+multiplatform = "1.9.3"
 okhttp = "5.3.2"
 phoenix = "3.0.0"
 #noinspection NewerVersionAvailable,GradleDependency --> 2.8 is the last version, not 2.71828!
@@ -67,6 +72,7 @@ work = "2.10.5"  # Newer versions require minSdk >= 23
 [libraries]
 acra-core = { module = "ch.acra:acra-core", version.ref = "acra" }
 android-desugar = { module = "com.android.tools:desugar_jdk_libs_nio", version.ref = "desugar" }
+androidx-activity = { module = "androidx.activity:activity-compose", version.ref = "activity" }
 androidx-appcompat = { module = "androidx.appcompat:appcompat", version.ref = "appcompat" }
 androidx-cardview = { module = "androidx.cardview:cardview", version.ref = "cardview" }
 androidx-constraintlayout = { module = "androidx.constraintlayout:constraintlayout", version.ref = "constraintlayout" }
@@ -107,8 +113,11 @@ google-exoplayer-smoothstreaming = { module = "com.google.android.exoplayer:exop
 google-exoplayer-ui = { module = "com.google.android.exoplayer:exoplayer-ui", version.ref = "exoplayer" }
 jakewharton-phoenix = { module = "com.jakewharton:process-phoenix", version.ref = "phoenix" }
 jakewharton-rxbinding = { module = "com.jakewharton.rxbinding4:rxbinding", version.ref = "rxbinding" }
+jetbrains-kotlinx-coroutinesSwing = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-swing", version.ref = "coroutines" }
+jetbrains-lifecycle-viewmodel = { module = "org.jetbrains.androidx.lifecycle:lifecycle-viewmodel-compose", version.ref = "lifecycle-jetbrains" }
 jsoup = { module = "org.jsoup:jsoup", version.ref = "jsoup" }
 junit = { module = "junit:junit", version.ref = "junit" }
+kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }
 lisawray-groupie-core = { module = "com.github.lisawray.groupie:groupie", version.ref = "groupie" }
 lisawray-groupie-viewbinding = { module = "com.github.lisawray.groupie:groupie-viewbinding", version.ref = "groupie" }
 livefront-bridge = { module = "com.github.livefront:bridge", version.ref = "bridge" }
@@ -132,8 +141,13 @@ zacsweers-autoservice-compiler = { module = "dev.zacsweers.autoservice:auto-serv
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "agp" }
+android-library = { id = "com.android.kotlin.multiplatform.library", version.ref = "agp" }
 google-ksp = { id = "com.google.devtools.ksp", version.ref = "ksp" }
+jetbrains-compose-hotreload = { id = "org.jetbrains.compose.hot-reload", version.ref = "hotreload" }
+jetbrains-compose-multiplatform = { id = "org.jetbrains.compose", version.ref = "multiplatform" }
 jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
+jetbrains-kotlin-compose = { id = "org.jetbrains.kotlin.plugin.compose", version.ref = "kotlin" }
 jetbrains-kotlin-kapt = { id = "org.jetbrains.kotlin.kapt", version.ref = "kotlin" } # Needed for statesaver
+jetbrains-kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 jetbrains-kotlin-parcelize = { id = "org.jetbrains.kotlin.plugin.parcelize", version.ref = "kotlin" }
 sonarqube = { id = "org.sonarqube", version.ref = "sonarqube" }