[DocsUI M3] Add a DocsUI flag for adopting material 3

The flag will be used in both Java code and XML files, resource
flag needs to be read only.

Bug: 373720657
Test: m DocumentsUIGoogle
Flag: com.android.documentsui.flags.use_material3
Change-Id: I5b8e7734a4826137927d13fc0b29f874642b3ed5

2 files changed, 26 insertions, 0 deletions

diff --git a/Android.bp b/Android.bp
index f2ae7919c..cd0b9c99c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -27,6 +27,20 @@ license {
     license_text: [],
 }
 
+aconfig_declarations {
+    name: "docsui-flags-aconfig",
+    package: "com.android.documentsui.flags",
+    container: "system",
+    srcs: ["flags.aconfig"],
+}
+
+java_aconfig_library {
+    name: "docsui-flags-aconfig-java-lib",
+    aconfig_declarations: "docsui-flags-aconfig",
+    min_sdk_version: "29",
+    sdk_version: "system_current",
+}
+
 java_library {
     name: "docsui-change-ids",
     srcs: ["src/com/android/documentsui/ChangeIds.java"],
@@ -95,6 +109,8 @@ genrule {
 android_library {
     name: "DocumentsUI-lib",
     defaults: ["documentsui_defaults"],
+    static_libs: ["docsui-flags-aconfig-java-lib"],
+    flags_packages: ["docsui-flags-aconfig"],
 
     manifest: "AndroidManifestLib.xml",
 
diff --git a/flags.aconfig b/flags.aconfig
new file mode 100644
index 000000000..6ce714fe9
--- /dev/null
+++ b/flags.aconfig
@@ -0,0 +1,10 @@
+package: "com.android.documentsui.flags"
+container: "system"
+
+flag {
+    name: "use_material3"
+    namespace: "documentsui"
+    description: "Use Material 3 theme and styles."
+    bug: "373720657"
+    is_fixed_read_only: true
+}
\ No newline at end of file