diff --git a/camera/include/camera/camera2/CaptureRequest.h b/camera/include/camera/camera2/CaptureRequest.h
index 0180183..e39dfcf 100644
--- a/camera/include/camera/camera2/CaptureRequest.h
+++ b/camera/include/camera/camera2/CaptureRequest.h
@@ -43,6 +43,7 @@
     CameraMetadata          mMetadata;
     Vector<sp<Surface> >    mSurfaceList;
     bool                    mIsReprocess;
+    void*                   mContext; // arbitrary user context from NDK apps, null for java apps
 
     /**
      * Keep impl up-to-date with CaptureRequest.java in frameworks/base
diff --git a/camera/ndk/NdkCaptureRequest.cpp b/camera/ndk/NdkCaptureRequest.cpp
index 5b4c180..ac1856b 100644
--- a/camera/ndk/NdkCaptureRequest.cpp
+++ b/camera/ndk/NdkCaptureRequest.cpp
@@ -142,3 +142,40 @@
     delete request;
     return;
 }
+
+EXPORT
+camera_status_t ACaptureRequest_setUserContext(
+        ACaptureRequest* request, void* context) {
+    if (request == nullptr) {
+        ALOGE("%s: invalid argument! request is NULL", __FUNCTION__);
+        return ACAMERA_ERROR_INVALID_PARAMETER;
+    }
+    return request->setContext(context);
+}
+
+EXPORT
+camera_status_t ACaptureRequest_getUserContext(
+        const ACaptureRequest* request, /*out*/void** context) {
+    if (request == nullptr || context == nullptr) {
+        ALOGE("%s: invalid argument! request %p, context %p",
+                __FUNCTION__, request, context);
+        return ACAMERA_ERROR_INVALID_PARAMETER;
+    }
+    return request->getContext(context);
+}
+
+EXPORT
+ACaptureRequest* ACaptureRequest_copy(const ACaptureRequest* src) {
+    ATRACE_CALL();
+    if (src == nullptr) {
+        ALOGE("%s: src is null!", __FUNCTION__);
+        return nullptr;
+    }
+
+    ACaptureRequest* pRequest = new ACaptureRequest();
+    pRequest->settings = new ACameraMetadata(*(src->settings));
+    pRequest->targets  = new ACameraOutputTargets();
+    *(pRequest->targets)  = *(src->targets);
+    pRequest->context = src->context;
+    return pRequest;
+}
diff --git a/camera/ndk/impl/ACameraDevice.cpp b/camera/ndk/impl/ACameraDevice.cpp
index 9ce0ac8..45fa28e 100644
--- a/camera/ndk/impl/ACameraDevice.cpp
+++ b/camera/ndk/impl/ACameraDevice.cpp
@@ -372,6 +372,7 @@
     sp<CaptureRequest> req(new CaptureRequest());
     req->mMetadata = request->settings->getInternalData();
     req->mIsReprocess = false; // NDK does not support reprocessing yet
+    req->mContext = request->context;
 
     for (auto outputTarget : request->targets->mOutputs) {
         ANativeWindow* anw = outputTarget.mWindow;
@@ -398,6 +399,7 @@
         ACameraOutputTarget outputTarget(anw);
         pRequest->targets->mOutputs.insert(outputTarget);
     }
+    pRequest->context = req->mContext;
     return pRequest;
 }
 
diff --git a/camera/ndk/impl/ACaptureRequest.h b/camera/ndk/impl/ACaptureRequest.h
index e5b453e..06b2cc3 100644
--- a/camera/ndk/impl/ACaptureRequest.h
+++ b/camera/ndk/impl/ACaptureRequest.h
@@ -45,8 +45,19 @@
 };
 
 struct ACaptureRequest {
+    camera_status_t setContext(void* ctx) {
+        context = ctx;
+        return ACAMERA_OK;
+    }
+
+    camera_status_t getContext(void** ctx) const {
+        *ctx = context;
+        return ACAMERA_OK;
+    }
+
     ACameraMetadata*      settings;
     ACameraOutputTargets* targets;
+    void*                 context;
 };
 
 #endif // _ACAPTURE_REQUEST_H
diff --git a/camera/ndk/include/camera/NdkCaptureRequest.h b/camera/ndk/include/camera/NdkCaptureRequest.h
index c62ba2c..4961ce3 100644
--- a/camera/ndk/include/camera/NdkCaptureRequest.h
+++ b/camera/ndk/include/camera/NdkCaptureRequest.h
@@ -305,6 +305,58 @@
 
 #endif /* __ANDROID_API__ >= 24 */
 
+#if __ANDROID_API__ >= 28
+
+/**
+ * Associate an arbitrary user context pointer to the {@link ACaptureRequest}
+ *
+ * This method is useful for user to identify the capture request in capture session callbacks.
+ * The context is NULL for newly created request.
+ * {@link ACameraOutputTarget_free} will not free the context. Also calling this method twice
+ * will not cause the previous context be freed.
+ * Also note that calling this method after the request has been sent to capture session will not
+ * change the context pointer in the capture callbacks.
+ *
+ * @param request the {@link ACaptureRequest} of interest.
+ * @param context the user context pointer to be associated with this capture request.
+ *
+ * @return <ul>
+ *         <li>{@link ACAMERA_OK} if the method call succeeds.</li>
+ *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if request is NULL.</li></ul>
+ */
+camera_status_t ACaptureRequest_setUserContext(
+        ACaptureRequest* request, void* context);
+
+/**
+ * Get the user context pointer of the {@link ACaptureRequest}
+ *
+ * This method is useful for user to identify the capture request in capture session callbacks.
+ * The context is NULL for newly created request.
+ *
+ * @param request the {@link ACaptureRequest} of interest.
+ * @param context the user context pointer of this capture request.
+ *
+ * @return <ul>
+ *         <li>{@link ACAMERA_OK} if the method call succeeds.</li>
+ *         <li>{@link ACAMERA_ERROR_INVALID_PARAMETER} if request is NULL.</li></ul>
+ */
+camera_status_t ACaptureRequest_getUserContext(
+        const ACaptureRequest* request, /*out*/void** context);
+
+/**
+ * Create a copy of input {@link ACaptureRequest}.
+ *
+ * <p>The returned ACaptureRequest must be freed by the application by {@link ACaptureRequest_free}
+ * after application is done using it.</p>
+ *
+ * @param src the input {@link ACaptureRequest} to be copied.
+ *
+ * @return a valid ACaptureRequest pointer or NULL if the input request cannot be copied.
+ */
+ACaptureRequest* ACaptureRequest_copy(const ACaptureRequest* src);
+
+#endif /* __ANDROID_API__ >= 28 */
+
 __END_DECLS
 
 #endif /* _NDK_CAPTURE_REQUEST_H */
diff --git a/camera/ndk/libcamera2ndk.map.txt b/camera/ndk/libcamera2ndk.map.txt
index 0a8a6e9..58d239b 100644
--- a/camera/ndk/libcamera2ndk.map.txt
+++ b/camera/ndk/libcamera2ndk.map.txt
@@ -26,9 +26,11 @@
     ACameraOutputTarget_create;
     ACameraOutputTarget_free;
     ACaptureRequest_addTarget;
+    ACaptureRequest_copy;
     ACaptureRequest_free;
     ACaptureRequest_getAllTags;
     ACaptureRequest_getConstEntry;
+    ACaptureRequest_getUserContext;
     ACaptureRequest_removeTarget;
     ACaptureRequest_setEntry_double;
     ACaptureRequest_setEntry_float;
@@ -36,6 +38,7 @@
     ACaptureRequest_setEntry_i64;
     ACaptureRequest_setEntry_rational;
     ACaptureRequest_setEntry_u8;
+    ACaptureRequest_setUserContext;
     ACaptureSessionOutputContainer_add;
     ACaptureSessionOutputContainer_create;
     ACaptureSessionOutputContainer_free;