diff --git a/android/src/main/kotlin/qiuxiang/android_window/AndroidWindowApplication.kt b/android/src/main/kotlin/qiuxiang/android_window/AndroidWindowApplication.kt
index 5a440e5..f03d654 100644
--- a/android/src/main/kotlin/qiuxiang/android_window/AndroidWindowApplication.kt
+++ b/android/src/main/kotlin/qiuxiang/android_window/AndroidWindowApplication.kt
@@ -9,5 +9,6 @@ open class AndroidWindowApplication : FlutterApplication() {
   var androidWindowMessenger: BinaryMessenger? = null
   var mainApi: MainApi? = null
   var activity: Activity? = null
+  var running = false
 }
 
diff --git a/android/src/main/kotlin/qiuxiang/android_window/MainApi.kt b/android/src/main/kotlin/qiuxiang/android_window/MainApi.kt
index 55fca21..93ae56f 100644
--- a/android/src/main/kotlin/qiuxiang/android_window/MainApi.kt
+++ b/android/src/main/kotlin/qiuxiang/android_window/MainApi.kt
@@ -40,6 +40,10 @@ class MainApi(private val activity: Activity) : Pigeon.MainApi {
     requestPermission { result.success(null) }
   }
 
+  override fun isRunning(result: Pigeon.Result<Boolean>) {
+    result.success((activity.application as AndroidWindowApplication).running)
+  }
+
   override fun post(data: MutableMap<Any, Any>?, result: Pigeon.Result<MutableMap<Any, Any>>?) {
     activity.app?.androidWindowMessenger?.let {
       Pigeon.AndroidWindowHandler(it).handler(data) { response -> result?.success(response) }
diff --git a/android/src/main/kotlin/qiuxiang/android_window/WindowService.kt b/android/src/main/kotlin/qiuxiang/android_window/WindowService.kt
index 9742ede..df80ca1 100644
--- a/android/src/main/kotlin/qiuxiang/android_window/WindowService.kt
+++ b/android/src/main/kotlin/qiuxiang/android_window/WindowService.kt
@@ -42,6 +42,7 @@ class WindowService : android.app.Service() {
       androidWindow.open()
       startForeground(1, getNotification())
       running = true
+      (application as AndroidWindowApplication).running = true
     }
     return super.onStartCommand(intent, flags, startId)
   }
@@ -61,5 +62,6 @@ class WindowService : android.app.Service() {
   override fun onDestroy() {
     androidWindow.close()
     engine.destroy()
+    (application as AndroidWindowApplication).running = false
   }
 }
diff --git a/lib/main.dart b/lib/main.dart
index 8cb8649..0bec76d 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -42,6 +42,11 @@ Future<bool> canDrawOverlays() {
   return _api.canDrawOverlays();
 }
 
+/// Checks if the window is running.
+Future<bool> isRunning() {
+  return _api.isRunning();
+}
+
 /// Request overlay permission.
 ///
 /// Show screen for controlling which apps can draw on top of other apps.
diff --git a/lib/pigeon.dart b/lib/pigeon.dart
index 7015144..c440768 100644
--- a/lib/pigeon.dart
+++ b/lib/pigeon.dart
@@ -14,6 +14,8 @@ abstract class MainApi {
   @async
   void requestPermission();
   @async
+  bool isRunning();
+  @async
   Map post(Map message);
   void open(String entry, int width, int height, int x, int y, bool focusable);
   void close();