proguard: Keep fields of generated proguard files

Inspired from https://github.com/protocolbuffers/protobuf/blob/main/java/lite.md#r8-rule-to-make-production-app-builds-work

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

.github/workflows/backport-pr.yml

@@ -22,7 +22,7 @@ jobs:
         github.event.comment.author_association == 'MEMBER'
         )
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Get backport metadata
         # the target branch is the first argument after `/backport`
         env:

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: gradle/actions/wrapper-validation@v4
+      - uses: gradle/actions/wrapper-validation@v5
 
       - name: create and checkout branch
         # push events already checked out the branch

app/build.gradle.kts

@@ -3,6 +3,8 @@
  * SPDX-License-Identifier: GPL-3.0-or-later
  */
 
+import com.android.build.api.dsl.ApplicationExtension
+
 plugins {
     alias(libs.plugins.android.application)
     alias(libs.plugins.jetbrains.kotlin.android)
@@ -32,7 +34,7 @@ kotlin {
     }
 }
 
-android {
+configure<ApplicationExtension> {
     compileSdk = 36
     namespace = "org.schabi.newpipe"
 
@@ -78,7 +80,10 @@ android {
             }
             isMinifyEnabled = true
             isShrinkResources = false // disabled to fix F-Droid"s reproducible build
-            proguardFiles(getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro")
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
         }
     }
 
@@ -100,7 +105,7 @@ android {
 
     sourceSets {
         getByName("androidTest") {
-            assets.srcDir("$projectDir/schemas")
+            assets.directories += "$projectDir/schemas"
         }
     }
 
@@ -111,6 +116,7 @@ android {
     buildFeatures {
         viewBinding = true
         buildConfig = true
+        resValues = true
     }
 
     packaging {

app/proguard-rules.pro

@@ -39,3 +39,8 @@
 
 ## For some reason NotificationModeConfigFragment wasn't kept (only referenced in a preference xml)
 -keep class org.schabi.newpipe.settings.notifications.** { *; }
+
+# Prevent R8 from stripping or renaming Protobuf internal fields
+-keepclassmembers class * extends com.google.protobuf.GeneratedMessageLite {
+    <fields>;
+}

gradle.properties

@@ -1,6 +1,4 @@
-android.enableJetifier=false
 android.nonFinalResIds=false
-android.nonTransitiveRClass=true
 android.useAndroidX=true
 org.gradle.jvmargs=-Xmx2048M --add-opens jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED
 systemProp.file.encoding=utf-8

gradle/libs.versions.toml

@@ -23,8 +23,8 @@ groupie = "2.10.1"
 jsoup = "1.22.1"
 junit = "4.13.2"
 junit-ext = "1.3.0"
-kotlin = "2.2.21"
-ksp = "2.3.4"
+kotlin = "2.3.0"
+ksp = "2.3.5"
 ktlint = "1.8.0"
 leakcanary = "2.14"
 lifecycle = "2.9.4" # Newer versions require minSdk >= 23