diff --git a/Sources/FirebaseAndroid/CMakeLists.txt b/Sources/FirebaseAndroid/CMakeLists.txt
index 4fd4ff7..bb5567b 100644
--- a/Sources/FirebaseAndroid/CMakeLists.txt
+++ b/Sources/FirebaseAndroid/CMakeLists.txt
@@ -7,3 +7,7 @@ target_include_directories(FirebaseAndroidJNI PUBLIC
 target_link_libraries(FirebaseAndroidJNI PRIVATE
   log)
 
+add_jar(SwiftFirebase
+          Native.java
+        INCLUDE_JARS
+          $ENV{ANDROID_SDK_ROOT}/platforms/android-${ANDROID_NATIVE_API_LEVEL}/android.jar)
diff --git a/Sources/FirebaseAndroid/Native.java b/Sources/FirebaseAndroid/Native.java
new file mode 100644
index 0000000..21f0895
--- /dev/null
+++ b/Sources/FirebaseAndroid/Native.java
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: BSD-3-Clause
+
+package company.thebrowser;
+
+import android.app.Activity;
+
+public class Native
+{
+  public native boolean RegisterActivity(android.app.Activity activity);
+}