diff --git a/libs/androidfw/AssetManager2.cpp b/libs/androidfw/AssetManager2.cpp
index 4fdae32..0cde3d1 100644
--- a/libs/androidfw/AssetManager2.cpp
+++ b/libs/androidfw/AssetManager2.cpp
@@ -1417,6 +1417,18 @@
   return {};
 }
 
+void Theme::Rebase(AssetManager2* am, const uint32_t* style_ids, const uint8_t* force,
+                   size_t style_count) {
+  ATRACE_NAME("Theme::Rebase");
+  // Reset the entries without changing the vector capacity to prevent reallocations during
+  // ApplyStyle.
+  entries_.clear();
+  asset_manager_ = am;
+  for (size_t i = 0; i < style_count; i++) {
+    ApplyStyle(style_ids[i], force[i]);
+  }
+}
+
 std::optional<AssetManager2::SelectedValue> Theme::GetAttribute(uint32_t resid) const {
 
   constexpr const uint32_t kMaxIterations = 20;
diff --git a/libs/androidfw/include/androidfw/AssetManager2.h b/libs/androidfw/include/androidfw/AssetManager2.h
index ae07e4b..7d01395 100644
--- a/libs/androidfw/include/androidfw/AssetManager2.h
+++ b/libs/androidfw/include/androidfw/AssetManager2.h
@@ -508,6 +508,11 @@
   // data failed.
   base::expected<std::monostate, NullOrIOError> ApplyStyle(uint32_t resid, bool force = false);
 
+  // Clears the existing theme, sets the new asset manager to use for this theme, and applies the
+  // styles in `style_ids` through repeated invocations of `ApplyStyle`.
+  void Rebase(AssetManager2* am, const uint32_t* style_ids, const uint8_t* force,
+              size_t style_count);
+
   // Sets this Theme to be a copy of `source` if `source` has the same AssetManager as this Theme.
   //
   // If `source` does not have the same AssetManager as this theme, only attributes from ApkAssets
diff --git a/libs/androidfw/tests/Theme_test.cpp b/libs/androidfw/tests/Theme_test.cpp
index f658735..77114f2 100644
--- a/libs/androidfw/tests/Theme_test.cpp
+++ b/libs/androidfw/tests/Theme_test.cpp
@@ -251,6 +251,80 @@
   EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC), value->flags);
 }
 
+TEST_F(ThemeTest, ThemeRebase) {
+  AssetManager2 am;
+  am.SetApkAssets({style_assets_.get()});
+
+  AssetManager2 am_night;
+  am_night.SetApkAssets({style_assets_.get()});
+
+  ResTable_config night{};
+  night.uiMode = ResTable_config::UI_MODE_NIGHT_YES;
+  night.version = 8u;
+  am_night.SetConfiguration(night);
+
+  auto theme = am.NewTheme();
+  {
+    const uint32_t styles[] = {app::R::style::StyleOne, app::R::style::StyleDayNight};
+    const uint8_t force[] = {true, true};
+    theme->Rebase(&am, styles, force, arraysize(styles));
+  }
+
+  // attr_one in StyleDayNight force overrides StyleOne. attr_one is defined in the StyleOne.
+  auto value = theme->GetAttribute(app::R::attr::attr_one);
+  ASSERT_TRUE(value);
+  EXPECT_EQ(10u, value->data);
+  EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC | ResTable_config::CONFIG_UI_MODE |
+            ResTable_config::CONFIG_VERSION), value->flags);
+
+  // attr_two is defined in the StyleOne.
+  value = theme->GetAttribute(app::R::attr::attr_two);
+  ASSERT_TRUE(value);
+  EXPECT_EQ(Res_value::TYPE_INT_DEC, value->type);
+  EXPECT_EQ(2u, value->data);
+  EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC), value->flags);
+
+  {
+    const uint32_t styles[] = {app::R::style::StyleOne, app::R::style::StyleDayNight};
+    const uint8_t force[] = {false, false};
+    theme->Rebase(&am, styles, force, arraysize(styles));
+  }
+
+  // attr_one in StyleDayNight does not override StyleOne because `force` is false.
+  value = theme->GetAttribute(app::R::attr::attr_one);
+  ASSERT_TRUE(value);
+  EXPECT_EQ(1u, value->data);
+  EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC), value->flags);
+
+  // attr_two is defined in the StyleOne.
+  value = theme->GetAttribute(app::R::attr::attr_two);
+  ASSERT_TRUE(value);
+  EXPECT_EQ(Res_value::TYPE_INT_DEC, value->type);
+  EXPECT_EQ(2u, value->data);
+  EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC), value->flags);
+
+  {
+    const uint32_t styles[] = {app::R::style::StyleOne, app::R::style::StyleDayNight};
+    const uint8_t force[] = {false, true};
+    theme->Rebase(&am_night, styles, force, arraysize(styles));
+  }
+
+  // attr_one is defined in the StyleDayNight.
+  value = theme->GetAttribute(app::R::attr::attr_one);
+  ASSERT_TRUE(value);
+  EXPECT_EQ(Res_value::TYPE_INT_DEC, value->type);
+  EXPECT_EQ(100u, value->data);
+  EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC | ResTable_config::CONFIG_UI_MODE |
+            ResTable_config::CONFIG_VERSION), value->flags);
+
+  // attr_two is now not here.
+  value = theme->GetAttribute(app::R::attr::attr_two);
+  ASSERT_TRUE(value);
+  EXPECT_EQ(Res_value::TYPE_INT_DEC, value->type);
+  EXPECT_EQ(2u, value->data);
+  EXPECT_EQ(static_cast<uint32_t>(ResTable_typeSpec::SPEC_PUBLIC), value->flags);
+}
+
 TEST_F(ThemeTest, OnlyCopySameAssetsThemeWhenAssetManagersDiffer) {
   AssetManager2 assetmanager_dst;
   assetmanager_dst.SetApkAssets({system_assets_.get(), lib_one_assets_.get(), style_assets_.get(),
diff --git a/libs/androidfw/tests/data/styles/R.h b/libs/androidfw/tests/data/styles/R.h
index f11486f..393a207 100644
--- a/libs/androidfw/tests/data/styles/R.h
+++ b/libs/androidfw/tests/data/styles/R.h
@@ -52,6 +52,7 @@
       StyleFive = 0x7f020004u,
       StyleSix = 0x7f020005u,
       StyleSeven = 0x7f020006u,
+      StyleDayNight = 0x7f020007u,
     };
   };
 };
diff --git a/libs/androidfw/tests/data/styles/res/values/styles.xml b/libs/androidfw/tests/data/styles/res/values/styles.xml
index 06774a8..fe46a3fa 100644
--- a/libs/androidfw/tests/data/styles/res/values/styles.xml
+++ b/libs/androidfw/tests/data/styles/res/values/styles.xml
@@ -89,4 +89,9 @@
         <item name="android:theme">@empty</item>
     </style>
 
+    <public type="style" name="StyleDayNight" id="0x7f020007" />
+    <style name="StyleDayNight">
+        <item name="attr_one">10</item>
+    </style>
+
 </resources>
diff --git a/libs/androidfw/tests/data/styles/styles.apk b/libs/androidfw/tests/data/styles/styles.apk
index 92e9bf9..91cd654 100644
--- a/libs/androidfw/tests/data/styles/styles.apk
+++ b/libs/androidfw/tests/data/styles/styles.apk
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