diff --git a/app/src/main/java/keijumt/devandroid/App.kt b/app/src/main/java/keijumt/devandroid/App.kt
index b420221..39562a1 100644
--- a/app/src/main/java/keijumt/devandroid/App.kt
+++ b/app/src/main/java/keijumt/devandroid/App.kt
@@ -16,6 +16,9 @@
 
 class App : DaggerApplication() {
 
+    // 現在のActivity
+    var currentActivity: Activity? = null
+
     companion object {
         /**
          * Activity に dagger#inject を注入
@@ -68,6 +71,9 @@
             }
 
             override fun onActivityStopped(activity: Activity?) {
+                if (currentActivity === activity) {
+                    currentActivity = null
+                }
             }
 
             override fun onActivityCreated(activity: Activity?, bundle: Bundle?) {