diff --git a/ndk/platforms/android-9/arch-arm/lib/libandroid.so b/ndk/platforms/android-9/arch-arm/lib/libandroid.so
index e8afccdcb..1ac0a9cc6 100644
Binary files a/ndk/platforms/android-9/arch-arm/lib/libandroid.so and b/ndk/platforms/android-9/arch-arm/lib/libandroid.so differ
diff --git a/ndk/platforms/android-9/include/android/native_activity.h b/ndk/platforms/android-9/include/android/native_activity.h
index d74e1ce5a..a8f11c97e 100644
--- a/ndk/platforms/android-9/include/android/native_activity.h
+++ b/ndk/platforms/android-9/include/android/native_activity.h
@@ -227,6 +227,12 @@ typedef void ANativeActivity_createFunc(ANativeActivity* activity,
  */
 extern ANativeActivity_createFunc ANativeActivity_onCreate;
 
+/**
+ * Finish the given activity.  Its finish() method will be called, causing it
+ * to be stopped and destroyed.
+ */
+void ANativeActivity_finish(ANativeActivity* activity);
+
 void ANativeActivity_setWindowFormat(ANativeActivity* activity, int32_t format);
 
 void ANativeActivity_setWindowFlags(ANativeActivity* activity,
diff --git a/ndk/platforms/android-9/include/android/storage_manager.h b/ndk/platforms/android-9/include/android/storage_manager.h
index 6f925c1ee..bad249133 100644
--- a/ndk/platforms/android-9/include/android/storage_manager.h
+++ b/ndk/platforms/android-9/include/android/storage_manager.h
@@ -18,6 +18,8 @@
 #ifndef ANDROID_STORAGE_MANAGER_H
 #define ANDROID_STORAGE_MANAGER_H
 
+#include <stdint.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -25,6 +27,60 @@ extern "C" {
 struct AStorageManager;
 typedef struct AStorageManager AStorageManager;
 
+enum {
+    /*
+     * The OBB container is now mounted and ready for use. Can be returned
+     * as the status for callbacks made during asynchronous OBB actions.
+     */
+    AOBB_STATE_MOUNTED = 1,
+
+    /*
+     * The OBB container is now unmounted and not usable. Can be returned
+     * as the status for callbacks made during asynchronous OBB actions.
+     */
+    AOBB_STATE_UNMOUNTED = 2,
+
+    /*
+     * There was an internal system error encountered while trying to
+     * mount the OBB. Can be returned as the status for callbacks made
+     * during asynchronous OBB actions.
+     */
+    AOBB_STATE_ERROR_INTERNAL = 20,
+
+    /*
+     * The OBB could not be mounted by the system. Can be returned as the
+     * status for callbacks made during asynchronous OBB actions.
+     */
+    AOBB_STATE_ERROR_COULD_NOT_MOUNT = 21,
+
+    /*
+     * The OBB could not be unmounted. This most likely indicates that a
+     * file is in use on the OBB. Can be returned as the status for
+     * callbacks made during asynchronous OBB actions.
+     */
+    AOBB_STATE_ERROR_COULD_NOT_UNMOUNT = 22,
+
+    /*
+     * A call was made to unmount the OBB when it was not mounted. Can be
+     * returned as the status for callbacks made during asynchronous OBB
+     * actions.
+     */
+    AOBB_STATE_ERROR_NOT_MOUNTED = 23,
+
+    /*
+     * The OBB has already been mounted. Can be returned as the status for
+     * callbacks made during asynchronous OBB actions.
+     */
+    AOBB_STATE_ERROR_ALREADY_MOUNTED = 24,
+
+    /*
+     * The current application does not have permission to use this OBB.
+     * This could be because the OBB indicates it's owned by a different
+     * package. Can be returned as the status for callbacks made during
+     * asynchronous OBB actions.
+     */
+    AOBB_STATE_ERROR_PERMISSION_DENIED = 25,
+};
 
 /**
  * Obtains a new instance of AStorageManager.
@@ -39,22 +95,19 @@ void AStorageManager_delete(AStorageManager* mgr);
 /**
  * Callback function for asynchronous calls made on OBB files.
  */
-typedef void (*AStorageManager_obbCallbackFunc)(const char* filename, const char* state, void* data);
-
-/**
- * Callback to call when requested asynchronous OBB operation is complete.
- */
-void AStorageManager_setObbCallback(AStorageManager* mgr, AStorageManager_obbCallbackFunc cb, void* data);
+typedef void (*AStorageManager_obbCallbackFunc)(const char* filename, const int32_t state, void* data);
 
 /**
  * Attempts to mount an OBB file. This is an asynchronous operation.
  */
-void AStorageManager_mountObb(AStorageManager* mgr, const char* filename, const char* key);
+void AStorageManager_mountObb(AStorageManager* mgr, const char* filename, const char* key,
+        AStorageManager_obbCallbackFunc cb, void* data);
 
 /**
  * Attempts to unmount an OBB file. This is an asynchronous operation.
  */
-void AStorageManager_unmountObb(AStorageManager* mgr, const char* filename, const int force);
+void AStorageManager_unmountObb(AStorageManager* mgr, const char* filename, const int force,
+        AStorageManager_obbCallbackFunc cb, void* data);
 
 /**
  * Check whether an OBB is mounted.