add android sample for falling balls mpp (#2275)

Co-authored-by: theapache64 <theapache64@users.noreply.github.com>

experimental/examples/falling-balls-mpp/.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

experimental/examples/falling-balls-mpp/.idea/artifacts/falling_balls_mpp_desktop_1_0_SNAPSHOT.xml

@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="falling-balls-mpp-desktop-1.0-SNAPSHOT">
+    <output-path>$PROJECT_DIR$/build/libs</output-path>
+    <root id="archive" name="falling-balls-mpp-desktop-1.0-SNAPSHOT.jar">
+      <element id="module-output" name="falling-balls-mpp.desktopMain" />
+    </root>
+  </artifact>
+</component>

experimental/examples/falling-balls-mpp/.idea/artifacts/falling_balls_mpp_js_1_0_SNAPSHOT.xml

@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="falling-balls-mpp-js-1.0-SNAPSHOT">
+    <output-path>$PROJECT_DIR$/build/libs</output-path>
+    <root id="archive" name="falling-balls-mpp-js-1.0-SNAPSHOT.jar">
+      <element id="module-output" name="falling-balls-mpp.jsMain" />
+    </root>
+  </artifact>
+</component>

experimental/examples/falling-balls-mpp/.idea/compiler.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="15" />
+  </component>
+</project>

experimental/examples/falling-balls-mpp/.idea/gradle.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="gradleJvm" value="#JAVA_HOME" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>

experimental/examples/falling-balls-mpp/.idea/jarRepositories.xml

@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenRepo" />
+      <option name="name" value="MavenRepo" />
+      <option name="url" value="https://repo.maven.apache.org/maven2/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="Gradle Central Plugin Repository" />
+      <option name="name" value="Gradle Central Plugin Repository" />
+      <option name="url" value="https://plugins.gradle.org/m2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenLocal" />
+      <option name="name" value="MavenLocal" />
+      <option name="url" value="file:$MAVEN_REPOSITORY$/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="maven" />
+      <option name="name" value="maven" />
+      <option name="url" value="https://maven.pkg.jetbrains.space/public/p/compose/dev" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="Google" />
+      <option name="name" value="Google" />
+      <option name="url" value="https://dl.google.com/dl/android/maven2/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenLocal" />
+      <option name="name" value="MavenLocal" />
+      <option name="url" value="file:$USER_HOME$/.m2/repository/" />
+    </remote-repository>
+  </component>
+</project>

experimental/examples/falling-balls-mpp/.idea/misc.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_15_PREVIEW" project-jdk-name="15" project-jdk-type="JavaSDK" />
+</project>

experimental/examples/falling-balls-mpp/.idea/vcs.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/../../.." vcs="Git" />
+    <mapping directory="$PROJECT_DIR$/build/xcodegen-2.26.0-src" vcs="Git" />
+  </component>
+</project>

experimental/examples/falling-balls-mpp/build.gradle.kts

@@ -15,6 +15,7 @@ buildscript {
 }
 
 plugins {
+    id("com.android.application")
     kotlin("multiplatform")
     id("org.jetbrains.compose")
 }
@@ -29,6 +30,7 @@ repositories {
     google()}
 
 kotlin {
+    android()
     jvm("desktop")
     js(IR) {
         browser()
@@ -98,6 +100,15 @@ kotlin {
             }
         }
 
+        val androidMain by getting {
+            dependsOn(commonMain)
+            kotlin.srcDirs("src/jvmMain/kotlin")
+            dependencies {
+                api("androidx.appcompat:appcompat:1.4.1")
+                implementation("androidx.activity:activity-compose:1.4.0")
+            }
+        }
+
         val desktopMain by getting {
              dependencies {
                 implementation(compose.desktop.currentOs)
@@ -210,3 +221,24 @@ project.tasks.withType(org.jetbrains.kotlin.gradle.dsl.KotlinJsCompile::class.ja
         "-Xir-dce-runtime-diagnostic=log"
     )
 }
+
+android {
+    compileSdk = 31
+
+    defaultConfig {
+        minSdk = 21
+        targetSdk = 31
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
+    }
+
+    sourceSets {
+        named("main") {
+            manifest.srcFile("src/androidMain/AndroidManifest.xml")
+            res.srcDirs("src/androidMain/res", "src/commonMain/resources")
+        }
+    }
+}

experimental/examples/falling-balls-mpp/gradle.properties

@@ -9,3 +9,5 @@ kotlin.mpp.enableGranularSourceSetsMetadata=true
 # Enable kotlin/native experimental memory model
 kotlin.native.binary.memoryModel=experimental
 compose.desktop.verbose=true
+agp.version=7.0.4
+android.useAndroidX=true

experimental/examples/falling-balls-mpp/settings.gradle.kts

@@ -10,6 +10,10 @@ pluginManagement {
     plugins {
         val kotlinVersion = extra["kotlin.version"] as String
         kotlin("multiplatform").version(kotlinVersion)
+        kotlin("android").version(kotlinVersion)
+
+        val agpVersion = extra["agp.version"] as String
+        id("com.android.application").version(agpVersion)
 
         val composeVersion = extra["compose.version"] as String
         id("org.jetbrains.compose").version(composeVersion)

experimental/examples/falling-balls-mpp/src/androidMain/AndroidManifest.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="org.jetbrains.fallingballs">
+
+    <application
+        android:allowBackup="true"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+        <activity
+            android:exported="true"
+            android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

experimental/examples/falling-balls-mpp/src/androidMain/kotlin/org/jetbrains/fallingballs/MainActivity.kt

@@ -0,0 +1,23 @@
+package org.jetbrains.fallingballs
+
+import FallingBalls
+import Game
+import Time
+import android.os.Bundle
+import androidx.activity.compose.setContent
+import androidx.appcompat.app.AppCompatActivity
+import androidx.compose.runtime.remember
+
+object AndroidTime : Time {
+    override fun now(): Long = System.nanoTime()
+}
+
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContent {
+            val game = remember { Game(AndroidTime) }
+            FallingBalls(game)
+        }
+    }
+}

experimental/examples/falling-balls-mpp/src/androidMain/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Chat app</string>
+</resources>

experimental/examples/falling-balls-mpp/src/commonMain/kotlin/fallingBalls/FallingBalls.kt

@@ -12,9 +12,7 @@ import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.layout.onSizeChanged
 import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.em
-import org.jetbrains.skiko.KotlinBackend
-import kotlin.math.round
+import androidx.compose.ui.unit.sp
 
 @Composable
 fun FallingBalls(game: Game) {
@@ -22,10 +20,10 @@ fun FallingBalls(game: Game) {
     Column {
         Text(
             "Catch balls!${if (game.finished) " Game over!" else ""}",
-            fontSize = 1.8f.em,
+            fontSize = 20.sp,
             color = Color(218, 120, 91)
         )
-        Text("Score: ${game.score} Time: ${game.elapsed / 1_000_000} Blocks: ${game.numBlocks.toInt()}", fontSize = 1.8f.em)
+        Text("Score: ${game.score} Time: ${game.elapsed / 1_000_000} Blocks: ${game.numBlocks.toInt()}", fontSize = 20.sp)
         Row {
             if (!game.started) {
                 Slider(
@@ -45,7 +43,7 @@ fun FallingBalls(game: Game) {
                     }
                 }
             ) {
-                Text(if (game.started) "Stop" else "Start", fontSize = 2f.em)
+                Text(if (game.started) "Stop" else "Start", fontSize = 25.sp)
             }
             if (game.started) {
                 Button(
@@ -56,7 +54,7 @@ fun FallingBalls(game: Game) {
                     onClick = {
                     game.togglePause()
                 }) {
-                    Text(if (game.paused) "Resume" else "Pause", fontSize = 2f.em)
+                    Text(if (game.paused) "Resume" else "Pause", fontSize = 25.sp)
                 }
             }
         }