diff --git a/sample_updater/src/com/example/android/systemupdatersample/util/UpdateEngineErrorCodes.java b/sample_updater/src/com/example/android/systemupdatersample/util/UpdateEngineErrorCodes.java
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+++ b/sample_updater/src/com/example/android/systemupdatersample/util/UpdateEngineErrorCodes.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.example.android.systemupdatersample.util;
+
+import android.os.UpdateEngine;
+import android.util.SparseArray;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Helper class to work with update_engine's error codes.
+ * Many error codes are defined in  {@link UpdateEngine.ErrorCodeConstants},
+ * but you can find more in system/update_engine/common/error_code.h.
+ */
+public final class UpdateEngineErrorCodes {
+
+    /**
+    * Error code from the update engine. Values must agree with the ones in
+    * system/update_engine/common/error_code.h.
+    */
+    public static final int UPDATED_BUT_NOT_ACTIVE = 52;
+
+    private static final SparseArray<String> CODE_TO_NAME_MAP = new SparseArray<>();
+
+    static {
+        CODE_TO_NAME_MAP.put(0, "SUCCESS");
+        CODE_TO_NAME_MAP.put(1, "ERROR");
+        CODE_TO_NAME_MAP.put(4, "FILESYSTEM_COPIER_ERROR");
+        CODE_TO_NAME_MAP.put(5, "POST_INSTALL_RUNNER_ERROR");
+        CODE_TO_NAME_MAP.put(6, "PAYLOAD_MISMATCHED_TYPE_ERROR");
+        CODE_TO_NAME_MAP.put(7, "INSTALL_DEVICE_OPEN_ERROR");
+        CODE_TO_NAME_MAP.put(8, "KERNEL_DEVICE_OPEN_ERROR");
+        CODE_TO_NAME_MAP.put(9, "DOWNLOAD_TRANSFER_ERROR");
+        CODE_TO_NAME_MAP.put(10, "PAYLOAD_HASH_MISMATCH_ERROR");
+        CODE_TO_NAME_MAP.put(11, "PAYLOAD_SIZE_MISMATCH_ERROR");
+        CODE_TO_NAME_MAP.put(12, "DOWNLOAD_PAYLOAD_VERIFICATION_ERROR");
+        CODE_TO_NAME_MAP.put(20, "DOWNLOAD_STATE_INITIALIZATION_ERROR");
+        CODE_TO_NAME_MAP.put(48, "USER_CANCELLED");
+        CODE_TO_NAME_MAP.put(52, "UPDATED_BUT_NOT_ACTIVE");
+    }
+
+    /**
+     * Completion codes returned by update engine indicating that the update
+     * was successfully applied.
+     */
+    private static final Set<Integer> SUCCEEDED_COMPLETION_CODES = new HashSet<Integer>(
+            Arrays.asList(UpdateEngine.ErrorCodeConstants.SUCCESS,
+                    // UPDATED_BUT_NOT_ACTIVE is returned when the payload is
+                    // successfully applied but the
+                    // device won't switch to the new slot after the next boot.
+                    UPDATED_BUT_NOT_ACTIVE));
+
+    /**
+     * checks if update succeeded using errorCode
+     */
+    public static boolean isUpdateSucceeded(int errorCode) {
+        return SUCCEEDED_COMPLETION_CODES.contains(errorCode);
+    }
+
+    /**
+     * converts error code to error name
+     */
+    public static String getCodeName(int errorCode) {
+        return CODE_TO_NAME_MAP.get(errorCode);
+    }
+
+    private UpdateEngineErrorCodes() {}
+}