新增一个lib

composeApp/build.gradle.kts

@@ -35,6 +35,7 @@ kotlin {
     sourceSets {
         androidMain.dependencies {
             implementation(libs.androidx.activity.compose)
+            implementation(project(":lib-arith"))
         }
         commonMain.dependencies {
         }

composeApp/src/androidMain/kotlin/com/example/testdemo/MainActivity.kt

@@ -27,7 +27,16 @@ class MainActivity : ComponentActivity() {
             textSize = 24f
         }
 
+        val resultAdd = com.example.arith.Arith.add(7, 3)
+        val resultSub = com.example.arith.Arith.sub(7, 3)
+
+        val addView = TextView(this).apply {
+            text = "Add is ${resultAdd}, Sub is ${resultSub}"
+            textSize = 24f
+        }
+
         root.addView(msgView)
+        root.addView(addView)
 
         setContentView(root)
     }

gradle.properties

@@ -12,3 +12,5 @@ android.nonTransitiveRClass=true
 android.useAndroidX=true
 
 org.gradle.java.home=/Users/jiangyuhuan/zulu-17.jdk/Contents/Home
+kotlin.mpp.androidGradlePluginCompatibility.nowarn=true
+kotlin.mpp.applyDefaultHierarchyTemplate=false
\ No newline at end of file

lib-arith/build.gradle.kts

+plugins {
+    id("org.jetbrains.kotlin.multiplatform")
+    id("com.android.library")
+}
+
+kotlin {
+    androidTarget()
+    iosArm64()
+    iosSimulatorArm64()
+    iosX64()
+
+
+    sourceSets {
+        val commonMain by getting
+        val androidMain by getting
+        val iosMain by creating { dependsOn(commonMain) }
+        val iosArm64Main by getting { dependsOn(iosMain) }
+        val iosSimulatorArm64Main by getting { dependsOn(iosMain) }
+        val iosX64Main by getting { dependsOn(iosMain) }
+
+    }
+}
+
+android {
+    namespace = "com.example.arith"
+    compileSdk = 34
+    defaultConfig { minSdk = 24 }
+}
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lib-arith/src/androidMain/AndroidManifest.xml

+<manifest package="com.example.arith" />
\ No newline at end of file

lib-arith/src/commonMain/kotlin/com/example/arith/Arith.kt

+package com.example.arith
+
+object Arith {
+    fun add(a: Int, b: Int): Int = a + b
+    fun sub(a: Int, b: Int): Int = a - b
+}
\ No newline at end of file

settings.gradle.kts

@@ -31,3 +31,4 @@ dependencyResolutionManagement {
 }
 
 include(":composeApp")
+include(":lib-arith")
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