Support users to set sdkDir for Android

Author: kx412764776

plugin/main/src/kotlinx/benchmark/gradle/AndroidMultiplatformTasks.kt

@@ -51,6 +51,16 @@ private fun Project.createSetupAndroidProjectTask(target: AndroidBenchmarkTarget
                 )
                 it.writeText(newText)
             }
+
+            generatedAndroidProjectDir.resolve("local.properties").let {
+                val sdkPath = target.sdkDir.orNull
+                if (sdkPath.isNullOrBlank()) {
+                    throw GradleException("Android SDK path is not set. Please set ANDROID_HOME environment variable or specify sdkPath in the build script.")
+                } else {
+                    it.writeText("sdk.dir=${sdkPath.replace("\\", "/")}\n")
+                    logger.info("SDK path written to local.properties: ${it.readText()}")
+                }
+            }
         }
     }
 }

plugin/main/src/kotlinx/benchmark/gradle/BenchmarkConfiguration.kt

@@ -1,6 +1,7 @@
 package kotlinx.benchmark.gradle
 
 import kotlinx.benchmark.gradle.internal.KotlinxBenchmarkPluginInternalApi
+import org.gradle.api.provider.Property
 import org.gradle.api.tasks.*
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinAndroidTarget
 import org.jetbrains.kotlin.gradle.plugin.mpp.KotlinJvmCompilation
@@ -134,5 +135,9 @@ class AndroidBenchmarkTarget
 constructor(
     extension: BenchmarksExtension,
     name: String,
-    val target: KotlinAndroidTarget
-) : BenchmarkTarget(extension, name)
+    val target: KotlinAndroidTarget,
+) : BenchmarkTarget(extension, name) {
+    val sdkDir: Property<String> = extension.project.objects.property(String::class.java).convention(
+        System.getenv("ANDROID_HOME") ?: ""
+    )
+}