diff --git a/core/api/current.txt b/core/api/current.txt
index 1eeb9275b0b20..d9ba8d4b2bdc1 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -8163,6 +8163,7 @@ package android.app.usage {
     method public long getAppBytes();
     method public long getCacheBytes();
     method public long getDataBytes();
+    method public long getExternalCacheBytes();
     method public void writeToParcel(android.os.Parcel, int);
     field @NonNull public static final android.os.Parcelable.Creator<android.app.usage.StorageStats> CREATOR;
   }
diff --git a/core/java/android/app/usage/StorageStats.java b/core/java/android/app/usage/StorageStats.java
index 4757557d0fd52..8d25d7bfb11bc 100644
--- a/core/java/android/app/usage/StorageStats.java
+++ b/core/java/android/app/usage/StorageStats.java
@@ -32,6 +32,7 @@ public final class StorageStats implements Parcelable {
     /** {@hide} */ public long codeBytes;
     /** {@hide} */ public long dataBytes;
     /** {@hide} */ public long cacheBytes;
+    /** {@hide} */ public long externalCacheBytes;
 
     /**
      * Return the size of app. This includes {@code APK} files, optimized
@@ -77,6 +78,17 @@ public final class StorageStats implements Parcelable {
         return cacheBytes;
     }
 
+    /**
+     * Return the size of all cached data in the primary external/shared storage.
+     * This includes files stored under
+     * {@link Context#getExternalCacheDir()}.
+     * <p>
+     * Cached data is isolated for each user on a multiuser device.
+     */
+    public @BytesLong long getExternalCacheBytes() {
+        return externalCacheBytes;
+    }
+
     /** {@hide} */
     public StorageStats() {
     }
@@ -86,6 +98,7 @@ public final class StorageStats implements Parcelable {
         this.codeBytes = in.readLong();
         this.dataBytes = in.readLong();
         this.cacheBytes = in.readLong();
+        this.externalCacheBytes = in.readLong();
     }
 
     @Override
@@ -98,6 +111,7 @@ public final class StorageStats implements Parcelable {
         dest.writeLong(codeBytes);
         dest.writeLong(dataBytes);
         dest.writeLong(cacheBytes);
+        dest.writeLong(externalCacheBytes);
     }
 
     public static final @android.annotation.NonNull Creator<StorageStats> CREATOR = new Creator<StorageStats>() {
diff --git a/services/usage/java/com/android/server/usage/StorageStatsService.java b/services/usage/java/com/android/server/usage/StorageStatsService.java
index 52b0afb56b3cd..a0a390947822a 100644
--- a/services/usage/java/com/android/server/usage/StorageStatsService.java
+++ b/services/usage/java/com/android/server/usage/StorageStatsService.java
@@ -514,6 +514,7 @@ public class StorageStatsService extends IStorageStatsManager.Stub {
         res.codeBytes = stats.codeSize + stats.externalCodeSize;
         res.dataBytes = stats.dataSize + stats.externalDataSize;
         res.cacheBytes = stats.cacheSize + stats.externalCacheSize;
+        res.externalCacheBytes = stats.externalCacheSize;
         return res;
     }