Enable app optimization with R8

AGENTS.md

@@ -39,6 +39,12 @@ Project-specific skills live in `./.claude/skills/<skill-name>/`. Load a skill w
 - **`android-java-to-kotlin`** (`./.claude/skills/android-java-to-kotlin/SKILL.md`) — Completes a Java-to-Kotlin conversion in this Android app. Use it when finishing a conversion, when the user mentions "java to kotlin", "j2k", "convert java", or "make it idiomatic", or when a freshly IDE-converted `.kt` file needs cleanup. The workflow is two-person: the developer first runs the Android Studio converter (`Code > Convert Java File to Kotlin File`), then the agent drives the idiomatic second pass — fail-fast control flow, function decomposition, `lifecycleScope`/coroutines instead of Java threads, modern Android APIs, and project conventions (SPDX headers, no magic numbers, `@JvmStatic`). The conversion must preserve behaviour, and the agent must write a behaviour-locking test before declaring it done.
 - **`android-activity-to-navigator-fragment`** (`./.claude/skills/android-activity-to-navigator-fragment/SKILL.md`) — Converts a standalone Activity (typically a drawer destination) into a Fragment hosted by `NavigatorActivity`. Use it when the user mentions "navigator", `NavigatorActivity`, `NavigatorScreen`, or "convert activity to fragment". It covers registering the `NavigatorScreen`, the fragment and its layout, decoupling collaborators from `FileActivity`, rewiring every entry point with `NavigatorActivity.intent(...)`, DI and manifest cleanup, and migrating the screenshot test.
 
+### Android Skills
+
+Agent skills for Android development at https://github.com/android/skills (overview: https://developer.android.com/tools/agents/android-skills). Use them when a task matches their trigger and no project-specific skill above covers it. Install one with the Android CLI (`android skills add <skill-name>`) or read its `SKILL.md` directly from the repository. Project-specific skills and the rules in this file take precedence over the official skills.
+
+- **`r8-analyzer`** (https://github.com/android/skills/tree/main/performance/r8-analyzer) — Analyzes the R8 configuration and keep rules for redundant, overly broad, or library-subsumed rules. Use it when changing the keep rules in `app/src/main/keepRules/` or the `optimization {}` blocks in `app/build.gradle.kts`.
+
 ## General Guidance
 
 Every new file needs to get a SPDX header in the first rows according to this template. 

app/build.gradle.kts

@@ -142,9 +142,11 @@ android {
 
         buildTypes {
             release {
+                optimization {
+                    enable = true
+                }
                 buildConfigField("String", "NC_TEST_SERVER_DATA_STRING", "\"\"")
             }
-
             debug {
                 enableUnitTestCoverage = project.hasProperty("coverage")
                 enableAndroidTestCoverage = project.hasProperty("coverage")

app/src/main/java/com/nextcloud/client/preferences/AppPreferencesImpl.java

@@ -15,8 +15,8 @@
 import android.content.SharedPreferences;
 import android.content.res.Configuration;
 
-import com.google.common.reflect.TypeToken;
 import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
 import com.nextcloud.appReview.AppReviewShownModel;
 import com.nextcloud.client.account.User;
 import com.nextcloud.client.account.UserAccountManager;

app/src/main/java/com/nextcloud/utils/extensions/ViewExtensions.kt

@@ -17,6 +17,7 @@ import android.view.ViewOutlineProvider
 import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.doOnLayout
 import androidx.core.view.updatePadding
 import com.google.android.material.behavior.HideViewOnScrollBehavior
 
@@ -81,7 +82,7 @@ fun View?.slideHideBottomBehavior(visible: Boolean) {
     if (params?.behavior !is HideViewOnScrollBehavior<*>) return
 
     val behavior = HideViewOnScrollBehavior.from(view)
-    view.post {
+    view.doOnLayout {
         if (visible) behavior.slideIn(view) else behavior.slideOut(view)
     }
 }

app/src/main/keepRules/ezvcard.keep

@@ -0,0 +1,11 @@
+# Nextcloud - Android Client
+#
+# SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+-keepclassmembers class * extends ezvcard.parameter.VCardParameter {
+    public static <fields>;
+    <init>(java.lang.String);
+    <init>(java.lang.String, ezvcard.VCardVersion[]);
+    <init>(java.lang.String, java.lang.String, java.lang.String);
+}

app/src/main/keepRules/gson-models.keep

@@ -0,0 +1,25 @@
+# Nextcloud - Android Client
+#
+# SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+-keepclassmembers class com.owncloud.android.authentication.AuthObject,
+        com.owncloud.android.authentication.Poll,
+        com.owncloud.android.authentication.LoginUrlInfo,
+        com.owncloud.android.authentication.EnforcedServer,
+        com.owncloud.android.datamodel.PushConfigurationState,
+        com.owncloud.android.datamodel.MediaFoldersModel,
+        com.owncloud.android.datamodel.DecryptedPushMessage,
+        com.nextcloud.client.jobs.LogEntry,
+        com.nextcloud.appReview.AppReviewShownModel,
+        com.nextcloud.client.NominatimClient$Companion$ReverseGeocodingResult,
+        com.nextcloud.model.OfflineOperationType$* {
+    !static !transient <fields>;
+    <init>(...);
+}
+
+-keepclassmembers class com.owncloud.android.datamodel.e2e.**,
+        com.owncloud.android.datamodel.EncryptedFiledrop {
+    <fields>;
+    <init>(...);
+}

app/src/main/keepRules/ical4j.keep

@@ -0,0 +1,14 @@
+# Nextcloud - Android Client
+#
+# SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+-keep class com.nextcloud.utils.ical.AndroidCompatTimeZoneRegistryFactory,
+            net.fortuna.ical4j.util.MapTimeZoneCache {
+    <init>();
+}
+
+-keeppackagenames net.fortuna.ical4j.transform.compliance
+
+-dontwarn java.time.zone.ZoneRulesProvider
+-dontwarn org.joda.convert.ToString

app/src/main/keepRules/legacy-http.keep

@@ -0,0 +1,15 @@
+# Nextcloud - Android Client
+#
+# SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+-keep class org.apache.commons.httpclient.auth.AuthPolicy
+-keep class org.apache.commons.httpclient.cookie.CookiePolicy
+-keep class * implements org.apache.commons.httpclient.auth.AuthScheme {
+    public <init>();
+}
+-keep class * implements org.apache.commons.httpclient.cookie.CookieSpec {
+    public <init>();
+}
+
+-keeppackagenames org.apache.jackrabbit.webdav

app/src/main/keepRules/nextcloud-library.keep

@@ -0,0 +1,12 @@
+# Nextcloud - Android Client
+#
+# SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+-keepclassmembers class com.owncloud.android.lib.**, com.nextcloud.android.lib.** {
+    !static !transient <fields>;
+    <init>(...);
+}
+
+-keep,allowobfuscation,allowshrinking class com.owncloud.android.lib.ocs.ServerResponse,
+        com.owncloud.android.lib.ocs.OCSResponse

app/src/main/keepRules/sso.keep

@@ -0,0 +1,14 @@
+# Nextcloud - Android Client
+#
+# SPDX-FileCopyrightText: 2026 Alper Ozturk <alper.ozturk@nextcloud.com>
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+-keep class com.nextcloud.android.sso.aidl.NextcloudRequest,
+            com.nextcloud.android.sso.QueryParam,
+            com.nextcloud.android.sso.PlainHeader {
+    static final long serialVersionUID;
+    !static !transient <fields>;
+    <init>(...);
+    private void writeObject(java.io.ObjectOutputStream);
+    private void readObject(java.io.ObjectInputStream);
+}