diff --git a/core/java/android/content/res/Configuration.java b/core/java/android/content/res/Configuration.java
index 1abfe7000221a..861ae7ba122ed 100644
--- a/core/java/android/content/res/Configuration.java
+++ b/core/java/android/content/res/Configuration.java
@@ -23,7 +23,6 @@ import static android.content.ConfigurationProto.HARD_KEYBOARD_HIDDEN;
 import static android.content.ConfigurationProto.KEYBOARD;
 import static android.content.ConfigurationProto.KEYBOARD_HIDDEN;
 import static android.content.ConfigurationProto.LOCALES;
-import static android.content.ConfigurationProto.LOCALE_LIST;
 import static android.content.ConfigurationProto.MCC;
 import static android.content.ConfigurationProto.MNC;
 import static android.content.ConfigurationProto.NAVIGATION;
@@ -1112,7 +1111,7 @@ public final class Configuration implements Parcelable, Comparable<Configuration
             protoOutputStream.write(MCC, mcc);
             protoOutputStream.write(MNC, mnc);
             if (mLocaleList != null) {
-                protoOutputStream.write(LOCALE_LIST, mLocaleList.toLanguageTags());
+                mLocaleList.writeToProto(protoOutputStream, LOCALES);
             }
             protoOutputStream.write(SCREEN_LAYOUT, screenLayout);
             protoOutputStream.write(COLOR_MODE, colorMode);
@@ -1276,14 +1275,6 @@ public final class Configuration implements Parcelable, Comparable<Configuration
                     case (int) WINDOW_CONFIGURATION:
                         windowConfiguration.readFromProto(protoInputStream, WINDOW_CONFIGURATION);
                         break;
-                    case (int) LOCALE_LIST:
-                        try {
-                            setLocales(LocaleList.forLanguageTags(protoInputStream.readString(
-                                    LOCALE_LIST)));
-                        } catch (Exception e) {
-                            Slog.e(TAG, "error parsing locale list in configuration.", e);
-                        }
-                        break;
                 }
             }
         } finally {
diff --git a/core/java/android/os/LocaleList.java b/core/java/android/os/LocaleList.java
index 0de09efad8eae..7782753e4abc9 100644
--- a/core/java/android/os/LocaleList.java
+++ b/core/java/android/os/LocaleList.java
@@ -21,7 +21,9 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.annotation.Size;
 import android.annotation.UnsupportedAppUsage;
+import android.content.LocaleProto;
 import android.icu.util.ULocale;
+import android.util.proto.ProtoOutputStream;
 
 import com.android.internal.annotations.GuardedBy;
 
@@ -140,6 +142,26 @@ public final class LocaleList implements Parcelable {
         dest.writeString(mStringRepresentation);
     }
 
+    /**
+     * Helper to write LocaleList to a protocol buffer output stream.  Assumes the parent
+     * protobuf has declared the locale as repeated.
+     *
+     * @param protoOutputStream Stream to write the locale to.
+     * @param fieldId Field Id of the Locale as defined in the parent message.
+     * @hide
+     */
+    public void writeToProto(ProtoOutputStream protoOutputStream, long fieldId) {
+        for (int i = 0; i < mList.length; i++) {
+            final Locale locale = mList[i];
+            final long token = protoOutputStream.start(fieldId);
+            protoOutputStream.write(LocaleProto.LANGUAGE, locale.getLanguage());
+            protoOutputStream.write(LocaleProto.COUNTRY, locale.getCountry());
+            protoOutputStream.write(LocaleProto.VARIANT, locale.getVariant());
+            protoOutputStream.write(LocaleProto.SCRIPT, locale.getScript());
+            protoOutputStream.end(token);
+        }
+    }
+
     /**
      * Retrieves a String representation of the language tags in this list.
      */
diff --git a/core/proto/android/content/configuration.proto b/core/proto/android/content/configuration.proto
index 7fa0ff64f8bfb..57ced09240f27 100644
--- a/core/proto/android/content/configuration.proto
+++ b/core/proto/android/content/configuration.proto
@@ -32,7 +32,7 @@ message ConfigurationProto {
     optional float font_scale = 1;
     optional uint32 mcc = 2;
     optional uint32 mnc = 3 [ (.android.privacy).dest = DEST_EXPLICIT ];
-    repeated LocaleProto locales = 4 [deprecated = true];
+    repeated LocaleProto locales = 4;
     optional uint32 screen_layout = 5;
     optional uint32 color_mode = 6;
     optional uint32 touchscreen = 7;
@@ -48,7 +48,6 @@ message ConfigurationProto {
     optional uint32 smallest_screen_width_dp = 17;
     optional uint32 density_dpi = 18;
     optional .android.app.WindowConfigurationProto window_configuration = 19;
-    optional string locale_list = 20;
 }
 
 /**
diff --git a/core/proto/android/content/locale.proto b/core/proto/android/content/locale.proto
index a8f2a13340380..bae6ec1419818 100644
--- a/core/proto/android/content/locale.proto
+++ b/core/proto/android/content/locale.proto
@@ -22,7 +22,6 @@ import "frameworks/base/core/proto/android/privacy.proto";
 package android.content;
 
 message LocaleProto {
-    option deprecated = true;
     option (.android.msg_privacy).dest = DEST_AUTOMATIC;
 
     optional string language = 1;
diff --git a/core/tests/coretests/src/android/content/res/ConfigurationTest.java b/core/tests/coretests/src/android/content/res/ConfigurationTest.java
index ad97ff101cb0b..2fc3e36e79483 100644
--- a/core/tests/coretests/src/android/content/res/ConfigurationTest.java
+++ b/core/tests/coretests/src/android/content/res/ConfigurationTest.java
@@ -16,29 +16,16 @@
 
 package android.content.res;
 
-import android.content.Context;
-import android.os.LocaleList;
 import android.platform.test.annotations.Presubmit;
-import android.util.AtomicFile;
-import android.util.proto.ProtoInputStream;
-import android.util.proto.ProtoOutputStream;
 
-import androidx.test.InstrumentationRegistry;
 import androidx.test.filters.SmallTest;
 
-import com.android.server.usage.IntervalStatsProto;
-
 import junit.framework.TestCase;
 
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
 
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.util.Locale;
-
 /**
  * Build/install/run: bit FrameworksCoreTests:android.content.res.ConfigurationTest
  */
@@ -67,70 +54,4 @@ public class ConfigurationTest extends TestCase {
         config2.updateFrom(config);
         assertEquals(config2.screenLayout, Configuration.SCREENLAYOUT_COMPAT_NEEDED);
     }
-
-    @Test
-    public void testReadWriteProto() throws Exception {
-        final Context context = InstrumentationRegistry.getTargetContext();
-        final File testDir = new File(context.getFilesDir(), "ConfigurationTest");
-        testDir.mkdirs();
-        final File proto = new File(testDir, "configs");
-        if (proto.exists()) {
-            proto.delete();
-        }
-
-        final Locale arabic = new Locale.Builder().setLocale(new Locale("ar", "AE")).build();
-        final Locale urdu = new Locale.Builder().setLocale(new Locale("ur", "IN")).build();
-        final Locale urduExtension = new Locale.Builder().setLocale(new Locale("ur", "IN"))
-                .setExtension('u', "nu-latn").build();
-        Configuration write = new Configuration();
-        write.setLocales(new LocaleList(arabic, urdu, urduExtension));
-        writeToProto(proto, write);
-        assertTrue("Failed to write configs to proto.", proto.exists());
-
-        final Configuration read = new Configuration();
-        try {
-            readFromProto(proto, read);
-        } finally {
-            proto.delete();
-        }
-
-        assertEquals("Missing locales in proto file written to disk.",
-                read.getLocales().size(), write.getLocales().size());
-        assertTrue("Arabic locale not found in Configuration locale list.",
-                read.getLocales().indexOf(arabic) != -1);
-        assertTrue("Urdu locale not found in Configuration locale list.",
-                read.getLocales().indexOf(urdu) != -1);
-        assertTrue("Urdu locale with extensions not found in Configuration locale list.",
-                read.getLocales().indexOf(urduExtension) != -1);
-    }
-
-    private void writeToProto(File f, Configuration config) throws Exception {
-        final AtomicFile af = new AtomicFile(f);
-        FileOutputStream fos = af.startWrite();
-        try {
-            final ProtoOutputStream protoOut = new ProtoOutputStream(fos);
-            final long token = protoOut.start(IntervalStatsProto.CONFIGURATIONS);
-            config.writeToProto(protoOut, IntervalStatsProto.Configuration.CONFIG, false, false);
-            protoOut.end(token);
-            protoOut.flush();
-            af.finishWrite(fos);
-            fos = null;
-        } finally {
-            af.failWrite(fos);
-        }
-    }
-
-    private void readFromProto(File f, Configuration config) throws Exception {
-        final AtomicFile afRead = new AtomicFile(f);
-        try (FileInputStream in = afRead.openRead()) {
-            final ProtoInputStream protoIn = new ProtoInputStream(in);
-            if (protoIn.isNextField(IntervalStatsProto.CONFIGURATIONS)) {
-                final long token = protoIn.start(IntervalStatsProto.CONFIGURATIONS);
-                if (protoIn.isNextField(IntervalStatsProto.Configuration.CONFIG)) {
-                    config.readFromProto(protoIn, IntervalStatsProto.Configuration.CONFIG);
-                    protoIn.end(token);
-                }
-            }
-        }
-    }
 }