diff --git a/android/build.gradle.kts b/android/build.gradle.kts
index dbee657..0ce25a9 100644
--- a/android/build.gradle.kts
+++ b/android/build.gradle.kts
@@ -1,3 +1,10 @@
+plugins {
+    // Declared with apply false so the Kotlin Gradle Plugin classes (used below to fix up
+    // file_picker's Kotlin compilation) are resolvable from this script, without applying the
+    // plugin to the root project itself. Version matches settings.gradle.kts.
+    id("org.jetbrains.kotlin.android") version "2.3.20" apply false
+}
+
 allprojects {
     repositories {
         google()
@@ -19,6 +26,28 @@ subprojects {
     project.evaluationDependsOn(":app")
 }
 
+// file_picker's android/build.gradle guards `apply plugin: 'org.jetbrains.kotlin.android'`
+// behind a runtime AGP-version check (skipped on AGP 9+, where it assumes AGP's built-in
+// Kotlin support is active). Flutter's own auto-apply logic in FlutterPluginUtils only
+// scans the file's text for that apply statement -- it matches even though the guard makes
+// it a no-op on this project's AGP 9, so Flutter skips applying Kotlin itself too. With
+// android.builtInKotlin=false (kept for compatibility with other plugins), no Kotlin plugin
+// ever gets applied to file_picker, and its Kotlin sources (including FilePickerPlugin) never
+// compile. Apply it explicitly here once AGP's library plugin is in place.
+subprojects {
+    if (name == "file_picker") {
+        pluginManager.withPlugin("com.android.library") {
+            pluginManager.apply("org.jetbrains.kotlin.android")
+            // file_picker's own jvmTarget = 17 setup is behind the same dead AGP9 guard, so its
+            // Kotlin compile tasks would otherwise default to the running JDK's target (21),
+            // conflicting with the javac target (17) set by its `compileOptions` block.
+            tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile>().configureEach {
+                compilerOptions.jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+            }
+        }
+    }
+}
+
 tasks.register<Delete>("clean") {
     delete(rootProject.layout.buildDirectory)
 }