Codex/r8 release optimization audit

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ concurrency:
 jobs:
   build-and-test:
     name: Build and test
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     steps:
       - name: Check out repository
@@ -38,7 +38,7 @@ jobs:
       - name: Set up Android SDK
         uses: android-actions/setup-android@v4
         with:
-          packages: 'platforms;android-37 build-tools;36.0.0'
+          packages: 'platforms;android-37.0 build-tools;36.0.0'
 
       - name: Set up Gradle
         uses: gradle/actions/setup-gradle@v6

README.md

@@ -26,4 +26,35 @@ This app converts strings with commonly used algorithms. API 26+
 You can check [releases page](https://github.com/SnowVolf/ConvertX/releases) for latest version
 You can also build this app from sources in Android Studio or Intellij IDEA (`Build -> Build Bundles -> Build APK`)
 
+## Build and upload to Google Drive
+
+The helper script can build an APK and upload it to a Google Drive folder through
+[`rclone`](https://rclone.org/drive/). The uploaded filename contains the app
+version from `app/version.properties`, the upload date, and the build variant:
+`Convert X 2.1.3 (19.09.2026) release.apk`.
+
+Configure an authenticated Google Drive remote once:
+
+```bash
+rclone config
+```
+
+Create a remote named `gdrive` with the Google Drive storage type. Then run:
+
+```bash
+./scripts/build-and-upload-drive.sh
+```
+
+Useful variants:
+
+```bash
+./scripts/build-and-upload-drive.sh --variant debug
+./scripts/build-and-upload-drive.sh --variant both
+./scripts/build-and-upload-drive.sh --folder "Convert X" --remote gdrive
+./scripts/build-and-upload-drive.sh --variant release --no-upload
+```
+
+The default destination is the `Convert X` folder in the configured Drive
+remote. Override it with `--folder` or the `DRIVE_FOLDER` environment variable.
+The script does not store Google credentials in the repository.
 

app/build.gradle

@@ -84,7 +84,6 @@ dependencies {
     implementation libs.androidx.lifecycle.viewmodel.navigation3
     implementation libs.androidx.lifecycle.viewmodel.compose
     implementation libs.androidx.lifecycle.runtime.compose
-    implementation libs.androidx.lifecycle.runtime.ktx
 
     implementation libs.androidx.room.runtime
     implementation libs.androidx.room.ktx

app/proguard-rules.pro

@@ -11,30 +11,3 @@
 -dontwarn com.google.auto.**
 -dontwarn com.google.common.**
 -dontwarn com.google.j2objc.**
-
-# Keep `Companion` object fields of serializable classes.
-# This avoids serializer lookup through `getDeclaredClasses` as done for named companion objects.
--if @kotlinx.serialization.Serializable class **
--keepclassmembers class <1> {
-   static <1>$Companion Companion;
-}
-
-# Keep `serializer()` on companion objects (both default and named) of serializable classes.
--if @kotlinx.serialization.Serializable class ** {
-   static **$* *;
-}
--keepclassmembers class <2>$<3> {
-   kotlinx.serialization.KSerializer serializer(...);
-}
-
-# Keep `INSTANCE.serializer()` of serializable objects.
--if @kotlinx.serialization.Serializable class ** {
-   public static ** INSTANCE;
-}
--keepclassmembers class <1> {
-   public static <1> INSTANCE;
-   kotlinx.serialization.KSerializer serializer(...);
-}
-
-# @Serializable and @Polymorphic are used at runtime for polymorphic serialization.
--keepattributes RuntimeVisibleAnnotations,AnnotationDefault