diff --git a/libs/nativewindow/AHardwareBuffer.cpp b/libs/nativewindow/AHardwareBuffer.cpp
index 1ec73ce..a375d43 100644
--- a/libs/nativewindow/AHardwareBuffer.cpp
+++ b/libs/nativewindow/AHardwareBuffer.cpp
@@ -397,6 +397,16 @@
     return 0;
 }
 
+int AHardwareBuffer_getId(const AHardwareBuffer* buffer, uint64_t* outId) {
+    if (!buffer || !outId) return BAD_VALUE;
+
+    const GraphicBuffer* gb = AHardwareBuffer_to_GraphicBuffer(buffer);
+    if (!gb) return BAD_VALUE;
+
+    *outId = gb->getId();
+
+    return OK;
+}
 
 // ----------------------------------------------------------------------------
 // VNDK functions
diff --git a/libs/nativewindow/include/android/hardware_buffer.h b/libs/nativewindow/include/android/hardware_buffer.h
index ae5e47b..4fcca9e 100644
--- a/libs/nativewindow/include/android/hardware_buffer.h
+++ b/libs/nativewindow/include/android/hardware_buffer.h
@@ -45,14 +45,14 @@
 #ifndef ANDROID_HARDWARE_BUFFER_H
 #define ANDROID_HARDWARE_BUFFER_H
 
+#include <android/rect.h>
 #include <inttypes.h>
-
 #include <sys/cdefs.h>
 
-#include <android/rect.h>
-
 __BEGIN_DECLS
 
+// clang-format off
+
 /**
  * Buffer pixel formats.
  */
@@ -201,9 +201,9 @@
     AHARDWAREBUFFER_USAGE_CPU_WRITE_MASK        = 0xFUL << 4,
 
     /// The buffer will be read from by the GPU as a texture.
-    AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE      = 1UL << 8,
+    AHARDWAREBUFFER_USAGE_GPU_SAMPLED_IMAGE     = 1UL << 8,
     /// The buffer will be written to by the GPU as a framebuffer attachment.
-    AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER        = 1UL << 9,
+    AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER       = 1UL << 9,
     /**
      * The buffer will be written to by the GPU as a framebuffer
      * attachment.
@@ -214,7 +214,7 @@
      * attachment should also have this flag. Use the equivalent flag
      * AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER to avoid this confusion.
      */
-    AHARDWAREBUFFER_USAGE_GPU_COLOR_OUTPUT       = AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER,
+    AHARDWAREBUFFER_USAGE_GPU_COLOR_OUTPUT      = AHARDWAREBUFFER_USAGE_GPU_FRAMEBUFFER,
     /**
      * The buffer will be used as a composer HAL overlay layer.
      *
@@ -225,7 +225,7 @@
      * directly through AHardwareBuffer_allocate instead of buffers allocated
      * by the framework.
      */
-    AHARDWAREBUFFER_USAGE_COMPOSER_OVERLAY       = 1ULL << 11,
+    AHARDWAREBUFFER_USAGE_COMPOSER_OVERLAY      = 1ULL << 11,
     /**
      * The buffer is protected from direct CPU access or being read by
      * non-secure hardware, such as video encoders.
@@ -236,19 +236,19 @@
      * GL_EXT_protected_textures for more information on how these
      * buffers are expected to behave.
      */
-    AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT      = 1UL << 14,
+    AHARDWAREBUFFER_USAGE_PROTECTED_CONTENT     = 1UL << 14,
     /// The buffer will be read by a hardware video encoder.
-    AHARDWAREBUFFER_USAGE_VIDEO_ENCODE           = 1UL << 16,
+    AHARDWAREBUFFER_USAGE_VIDEO_ENCODE          = 1UL << 16,
     /**
      * The buffer will be used for direct writes from sensors.
      * When this flag is present, the format must be AHARDWAREBUFFER_FORMAT_BLOB.
      */
-    AHARDWAREBUFFER_USAGE_SENSOR_DIRECT_DATA     = 1UL << 23,
+    AHARDWAREBUFFER_USAGE_SENSOR_DIRECT_DATA    = 1UL << 23,
     /**
      * The buffer will be used as a shader storage or uniform buffer object.
      * When this flag is present, the format must be AHARDWAREBUFFER_FORMAT_BLOB.
      */
-    AHARDWAREBUFFER_USAGE_GPU_DATA_BUFFER        = 1UL << 24,
+    AHARDWAREBUFFER_USAGE_GPU_DATA_BUFFER       = 1UL << 24,
     /**
      * The buffer will be used as a cube map texture.
      * When this flag is present, the buffer must have a layer count
@@ -256,13 +256,13 @@
      * bound to OpenGL textures using the extension
      * GL_EXT_EGL_image_storage instead of GL_KHR_EGL_image.
      */
-    AHARDWAREBUFFER_USAGE_GPU_CUBE_MAP               = 1UL << 25,
+    AHARDWAREBUFFER_USAGE_GPU_CUBE_MAP          = 1UL << 25,
     /**
      * The buffer contains a complete mipmap hierarchy.
      * Note that buffers with this flag must be bound to OpenGL textures using
      * the extension GL_EXT_EGL_image_storage instead of GL_KHR_EGL_image.
      */
-    AHARDWAREBUFFER_USAGE_GPU_MIPMAP_COMPLETE        = 1UL << 26,
+    AHARDWAREBUFFER_USAGE_GPU_MIPMAP_COMPLETE   = 1UL << 26,
 
     AHARDWAREBUFFER_USAGE_VENDOR_0  = 1ULL << 28,
     AHARDWAREBUFFER_USAGE_VENDOR_1  = 1ULL << 29,
@@ -291,8 +291,8 @@
  * parameters of existing ones.
  */
 typedef struct AHardwareBuffer_Desc {
-    uint32_t    width;      ///< Width in pixels.
-    uint32_t    height;     ///< Height in pixels.
+    uint32_t width;  ///< Width in pixels.
+    uint32_t height; ///< Height in pixels.
     /**
      * Number of images in an image array. AHardwareBuffers with one
      * layer correspond to regular 2D textures. AHardwareBuffers with
@@ -301,21 +301,21 @@
      * AHARDWAREBUFFER_USAGE_GPU_CUBE_MAP is present, the buffer is
      * a cube map or a cube map array.
      */
-    uint32_t    layers;
-    uint32_t    format;     ///< One of AHardwareBuffer_Format.
-    uint64_t    usage;      ///< Combination of AHardwareBuffer_UsageFlags.
-    uint32_t    stride;     ///< Row stride in pixels, ignored for AHardwareBuffer_allocate()
-    uint32_t    rfu0;       ///< Initialize to zero, reserved for future use.
-    uint64_t    rfu1;       ///< Initialize to zero, reserved for future use.
+    uint32_t layers;
+    uint32_t format; ///< One of AHardwareBuffer_Format.
+    uint64_t usage;  ///< Combination of AHardwareBuffer_UsageFlags.
+    uint32_t stride; ///< Row stride in pixels, ignored for AHardwareBuffer_allocate()
+    uint32_t rfu0;   ///< Initialize to zero, reserved for future use.
+    uint64_t rfu1;   ///< Initialize to zero, reserved for future use.
 } AHardwareBuffer_Desc;
 
 /**
  * Holds data for a single image plane.
  */
 typedef struct AHardwareBuffer_Plane {
-    void*       data;        ///< Points to first byte in plane
-    uint32_t    pixelStride; ///< Distance in bytes from the color channel of one pixel to the next
-    uint32_t    rowStride;   ///< Distance in bytes from the first value of one row of the image to
+    void*    _Nullable data; ///< Points to first byte in plane
+    uint32_t pixelStride;    ///< Distance in bytes from the color channel of one pixel to the next
+    uint32_t rowStride;      ///< Distance in bytes from the first value of one row of the image to
                              ///  the first value of the next row.
 } AHardwareBuffer_Plane;
 
@@ -323,8 +323,8 @@
  * Holds all image planes that contain the pixel data.
  */
 typedef struct AHardwareBuffer_Planes {
-    uint32_t               planeCount; ///< Number of distinct planes
-    AHardwareBuffer_Plane  planes[4];     ///< Array of image planes
+    uint32_t              planeCount; ///< Number of distinct planes
+    AHardwareBuffer_Plane planes[4];  ///< Array of image planes
 } AHardwareBuffer_Planes;
 
 /**
@@ -332,6 +332,8 @@
  */
 typedef struct AHardwareBuffer AHardwareBuffer;
 
+// clang-format on
+
 #if __ANDROID_API__ >= 26
 
 /**
@@ -347,8 +349,8 @@
  * \return 0 on success, or an error number of the allocation fails for
  * any reason. The returned buffer has a reference count of 1.
  */
-int AHardwareBuffer_allocate(const AHardwareBuffer_Desc* desc,
-        AHardwareBuffer** outBuffer) __INTRODUCED_IN(26);
+int AHardwareBuffer_allocate(const AHardwareBuffer_Desc* _Nonnull desc,
+                             AHardwareBuffer* _Nullable* _Nonnull outBuffer) __INTRODUCED_IN(26);
 /**
  * Acquire a reference on the given AHardwareBuffer object.
  *
@@ -357,7 +359,7 @@
  *
  * Available since API level 26.
  */
-void AHardwareBuffer_acquire(AHardwareBuffer* buffer) __INTRODUCED_IN(26);
+void AHardwareBuffer_acquire(AHardwareBuffer* _Nonnull buffer) __INTRODUCED_IN(26);
 
 /**
  * Remove a reference that was previously acquired with
@@ -365,7 +367,7 @@
  *
  * Available since API level 26.
  */
-void AHardwareBuffer_release(AHardwareBuffer* buffer) __INTRODUCED_IN(26);
+void AHardwareBuffer_release(AHardwareBuffer* _Nonnull buffer) __INTRODUCED_IN(26);
 
 /**
  * Return a description of the AHardwareBuffer in the passed
@@ -373,8 +375,8 @@
  *
  * Available since API level 26.
  */
-void AHardwareBuffer_describe(const AHardwareBuffer* buffer,
-        AHardwareBuffer_Desc* outDesc) __INTRODUCED_IN(26);
+void AHardwareBuffer_describe(const AHardwareBuffer* _Nonnull buffer,
+                              AHardwareBuffer_Desc* _Nonnull outDesc) __INTRODUCED_IN(26);
 
 /**
  * Lock the AHardwareBuffer for direct CPU access.
@@ -428,8 +430,57 @@
  * has more than one layer. Error number if the lock fails for any other
  * reason.
  */
-int AHardwareBuffer_lock(AHardwareBuffer* buffer, uint64_t usage,
-        int32_t fence, const ARect* rect, void** outVirtualAddress) __INTRODUCED_IN(26);
+int AHardwareBuffer_lock(AHardwareBuffer* _Nonnull buffer, uint64_t usage, int32_t fence,
+                         const ARect* _Nullable rect, void* _Nullable* _Nonnull outVirtualAddress)
+        __INTRODUCED_IN(26);
+
+/**
+ * Unlock the AHardwareBuffer from direct CPU access.
+ *
+ * Must be called after all changes to the buffer are completed by the
+ * caller.  If \a fence is NULL, the function will block until all work
+ * is completed.  Otherwise, \a fence will be set either to a valid file
+ * descriptor or to -1.  The file descriptor will become signaled once
+ * the unlocking is complete and buffer contents are updated.
+ * The caller is responsible for closing the file descriptor once it's
+ * no longer needed.  The value -1 indicates that unlocking has already
+ * completed before the function returned and no further operations are
+ * necessary.
+ *
+ * Available since API level 26.
+ *
+ * \return 0 on success. -EINVAL if \a buffer is NULL. Error number if
+ * the unlock fails for any reason.
+ */
+int AHardwareBuffer_unlock(AHardwareBuffer* _Nonnull buffer, int32_t* _Nullable fence)
+        __INTRODUCED_IN(26);
+
+/**
+ * Send the AHardwareBuffer to an AF_UNIX socket.
+ *
+ * Available since API level 26.
+ *
+ * \return 0 on success, -EINVAL if \a buffer is NULL, or an error
+ * number if the operation fails for any reason.
+ */
+int AHardwareBuffer_sendHandleToUnixSocket(const AHardwareBuffer* _Nonnull buffer, int socketFd)
+        __INTRODUCED_IN(26);
+
+/**
+ * Receive an AHardwareBuffer from an AF_UNIX socket.
+ *
+ * Available since API level 26.
+ *
+ * \return 0 on success, -EINVAL if \a outBuffer is NULL, or an error
+ * number if the operation fails for any reason.
+ */
+int AHardwareBuffer_recvHandleFromUnixSocket(int socketFd,
+                                             AHardwareBuffer* _Nullable* _Nonnull outBuffer)
+        __INTRODUCED_IN(26);
+
+#endif // __ANDROID_API__ >= 26
+
+#if __ANDROID_API__ >= 29
 
 /**
  * Lock a potentially multi-planar AHardwareBuffer for direct CPU access.
@@ -458,52 +509,9 @@
  * has more than one layer. Error number if the lock fails for any other
  * reason.
  */
-int AHardwareBuffer_lockPlanes(AHardwareBuffer* buffer, uint64_t usage,
-        int32_t fence, const ARect* rect, AHardwareBuffer_Planes* outPlanes) __INTRODUCED_IN(29);
-
-/**
- * Unlock the AHardwareBuffer from direct CPU access.
- *
- * Must be called after all changes to the buffer are completed by the
- * caller.  If \a fence is NULL, the function will block until all work
- * is completed.  Otherwise, \a fence will be set either to a valid file
- * descriptor or to -1.  The file descriptor will become signaled once
- * the unlocking is complete and buffer contents are updated.
- * The caller is responsible for closing the file descriptor once it's
- * no longer needed.  The value -1 indicates that unlocking has already
- * completed before the function returned and no further operations are
- * necessary.
- *
- * Available since API level 26.
- *
- * \return 0 on success. -EINVAL if \a buffer is NULL. Error number if
- * the unlock fails for any reason.
- */
-int AHardwareBuffer_unlock(AHardwareBuffer* buffer, int32_t* fence) __INTRODUCED_IN(26);
-
-/**
- * Send the AHardwareBuffer to an AF_UNIX socket.
- *
- * Available since API level 26.
- *
- * \return 0 on success, -EINVAL if \a buffer is NULL, or an error
- * number if the operation fails for any reason.
- */
-int AHardwareBuffer_sendHandleToUnixSocket(const AHardwareBuffer* buffer, int socketFd) __INTRODUCED_IN(26);
-
-/**
- * Receive an AHardwareBuffer from an AF_UNIX socket.
- *
- * Available since API level 26.
- *
- * \return 0 on success, -EINVAL if \a outBuffer is NULL, or an error
- * number if the operation fails for any reason.
- */
-int AHardwareBuffer_recvHandleFromUnixSocket(int socketFd, AHardwareBuffer** outBuffer) __INTRODUCED_IN(26);
-
-#endif // __ANDROID_API__ >= 26
-
-#if __ANDROID_API__ >= 29
+int AHardwareBuffer_lockPlanes(AHardwareBuffer* _Nonnull buffer, uint64_t usage, int32_t fence,
+                               const ARect* _Nullable rect,
+                               AHardwareBuffer_Planes* _Nonnull outPlanes) __INTRODUCED_IN(29);
 
 /**
  * Test whether the given format and usage flag combination is
@@ -524,7 +532,7 @@
  * \return 1 if the format and usage flag combination is allocatable,
  *     0 otherwise.
  */
-int AHardwareBuffer_isSupported(const AHardwareBuffer_Desc* desc) __INTRODUCED_IN(29);
+int AHardwareBuffer_isSupported(const AHardwareBuffer_Desc* _Nonnull desc) __INTRODUCED_IN(29);
 
 /**
  * Lock an AHardwareBuffer for direct CPU access.
@@ -537,11 +545,29 @@
  *
  * Available since API level 29.
  */
-int AHardwareBuffer_lockAndGetInfo(AHardwareBuffer* buffer, uint64_t usage,
-        int32_t fence, const ARect* rect, void** outVirtualAddress,
-        int32_t* outBytesPerPixel, int32_t* outBytesPerStride) __INTRODUCED_IN(29);
+int AHardwareBuffer_lockAndGetInfo(AHardwareBuffer* _Nonnull buffer, uint64_t usage, int32_t fence,
+                                   const ARect* _Nullable rect,
+                                   void* _Nullable* _Nonnull outVirtualAddress,
+                                   int32_t* _Nonnull outBytesPerPixel,
+                                   int32_t* _Nonnull outBytesPerStride) __INTRODUCED_IN(29);
+
 #endif // __ANDROID_API__ >= 29
 
+#if __ANDROID_API__ >= 31
+
+/**
+ * Get the system wide unique id for an AHardwareBuffer.
+ *
+ * Available since API level 31.
+ *
+ * \return 0 on success, -EINVAL if \a buffer or \a outId is NULL, or an error number if the
+ * operation fails for any reason.
+ */
+int AHardwareBuffer_getId(const AHardwareBuffer* _Nonnull buffer, uint64_t* _Nonnull outId)
+        __INTRODUCED_IN(31);
+
+#endif // __ANDROID_API__ >= 31
+
 __END_DECLS
 
 #endif // ANDROID_HARDWARE_BUFFER_H
diff --git a/libs/nativewindow/include/vndk/hardware_buffer.h b/libs/nativewindow/include/vndk/hardware_buffer.h
index 3392d7f..50fe0b7 100644
--- a/libs/nativewindow/include/vndk/hardware_buffer.h
+++ b/libs/nativewindow/include/vndk/hardware_buffer.h
@@ -24,7 +24,14 @@
 
 __BEGIN_DECLS
 
-const native_handle_t* AHardwareBuffer_getNativeHandle(const AHardwareBuffer* buffer);
+/**
+ * Get the native handle from an AHardwareBuffer.
+ *
+ * \return a non-NULL native handle on success, NULL if \a buffer is nullptr or the operation fails
+ * for any reason.
+ */
+const native_handle_t* _Nullable AHardwareBuffer_getNativeHandle(
+        const AHardwareBuffer* _Nonnull buffer);
 
 enum CreateFromHandleMethod {
     // enum values chosen to match internal GraphicBuffer::HandleWrapMethod
@@ -33,9 +40,9 @@
 };
 
 /**
- * Create a AHardwareBuffer from a native handle.
+ * Create an AHardwareBuffer from a native handle.
  *
- * This function wraps a native handle in a AHardwareBuffer suitable for use by applications or
+ * This function wraps a native handle in an AHardwareBuffer suitable for use by applications or
  * other parts of the system. The contents of desc will be returned by AHardwareBuffer_describe().
  *
  * If method is AHARDWAREBUFFER_CREATE_FROM_HANDLE_METHOD_REGISTER, the handle is assumed to be
@@ -44,10 +51,13 @@
  *
  * If method is AHARDWAREBUFFER_CREATE_FROM_HANDLE_METHOD_CLONE, the handle will be cloned and the
  * clone registered. The AHardwareBuffer will own the cloned handle but not the original.
+ *
+ * \return 0 on success, -EINVAL if \a desc or \a handle or outBuffer is NULL, or an error number if
+ * the operation fails for any reason.
  */
-int AHardwareBuffer_createFromHandle(const AHardwareBuffer_Desc* desc,
-                                     const native_handle_t* handle, int32_t method,
-                                     AHardwareBuffer** outBuffer);
+int AHardwareBuffer_createFromHandle(const AHardwareBuffer_Desc* _Nonnull desc,
+                                     const native_handle_t* _Nonnull handle, int32_t method,
+                                     AHardwareBuffer* _Nullable* _Nonnull outBuffer);
 
 /**
  * Buffer pixel formats.
diff --git a/libs/nativewindow/libnativewindow.map.txt b/libs/nativewindow/libnativewindow.map.txt
index 1b5d20d..8f2a074 100644
--- a/libs/nativewindow/libnativewindow.map.txt
+++ b/libs/nativewindow/libnativewindow.map.txt
@@ -4,6 +4,7 @@
     AHardwareBuffer_allocate;
     AHardwareBuffer_createFromHandle; # llndk # apex
     AHardwareBuffer_describe;
+    AHardwareBuffer_getId; # introduced=31
     AHardwareBuffer_getNativeHandle; # llndk # apex
     AHardwareBuffer_isSupported; # introduced=29
     AHardwareBuffer_lock;
diff --git a/libs/nativewindow/tests/AHardwareBufferTest.cpp b/libs/nativewindow/tests/AHardwareBufferTest.cpp
index 71b1f9f..ef863b6 100644
--- a/libs/nativewindow/tests/AHardwareBufferTest.cpp
+++ b/libs/nativewindow/tests/AHardwareBufferTest.cpp
@@ -17,12 +17,11 @@
 #define LOG_TAG "AHardwareBuffer_test"
 //#define LOG_NDEBUG 0
 
-#include <android/hardware_buffer.h>
-#include <private/android/AHardwareBufferHelpers.h>
 #include <android/hardware/graphics/common/1.0/types.h>
-#include <vndk/hardware_buffer.h>
-
 #include <gtest/gtest.h>
+#include <private/android/AHardwareBufferHelpers.h>
+#include <ui/GraphicBuffer.h>
+#include <vndk/hardware_buffer.h>
 
 using namespace android;
 using android::hardware::graphics::common::V1_0::BufferUsage;
@@ -131,3 +130,43 @@
     AHardwareBuffer_release(buffer);
     AHardwareBuffer_release(otherBuffer);
 }
+
+TEST(AHardwareBufferTest, GetIdTest) {
+    const uint32_t testWidth = 4;
+    const uint32_t testHeight = 4;
+    const uint32_t testLayers = 1;
+
+    AHardwareBuffer* ahb1 = nullptr;
+    uint64_t id1 = 0;
+    const AHardwareBuffer_Desc desc = {
+            .width = testWidth,
+            .height = testHeight,
+            .layers = testLayers,
+            .format = AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM,
+            .usage = AHARDWAREBUFFER_USAGE_CPU_READ_RARELY,
+    };
+    int res = AHardwareBuffer_allocate(&desc, &ahb1);
+    EXPECT_EQ(NO_ERROR, res);
+    EXPECT_NE(nullptr, ahb1);
+    EXPECT_EQ(0, AHardwareBuffer_getId(ahb1, &id1));
+    const GraphicBuffer* gb1 = AHardwareBuffer_to_GraphicBuffer(ahb1);
+    EXPECT_NE(nullptr, gb1);
+    EXPECT_EQ(id1, gb1->getId());
+    EXPECT_NE(id1, 0);
+
+    sp<GraphicBuffer> gb2(new GraphicBuffer(testWidth,
+                                            testHeight,
+                                            PIXEL_FORMAT_RGBA_8888,
+                                            testLayers,
+                                            GraphicBuffer::USAGE_SW_READ_RARELY,
+                                            std::string("test")));
+    EXPECT_NE(nullptr, gb2.get());
+    const AHardwareBuffer* ahb2 = AHardwareBuffer_from_GraphicBuffer(gb2.get());
+    EXPECT_NE(nullptr, ahb2);
+    uint64_t id2 = 0;
+    EXPECT_EQ(0, AHardwareBuffer_getId(ahb2, &id2));
+    EXPECT_EQ(id2, gb2->getId());
+    EXPECT_NE(id2, 0);
+
+    EXPECT_NE(id1, id2);
+}
diff --git a/libs/nativewindow/tests/Android.bp b/libs/nativewindow/tests/Android.bp
index cdb3d20..2e4bd99 100644
--- a/libs/nativewindow/tests/Android.bp
+++ b/libs/nativewindow/tests/Android.bp
@@ -24,6 +24,7 @@
         "liblog",
         "libnativewindow",
         "libsync",
+        "libui",
         "libutils",
         "android.hardware.graphics.common@1.0",
     ],