feat: add dark mode support

opencloudApp/src/androidTest/java/eu/opencloud/android/settings/SettingsFragmentTest.kt

@@ -24,7 +24,9 @@ import android.content.ClipboardManager
 import android.content.Context
 import androidx.fragment.app.testing.FragmentScenario
 import androidx.fragment.app.testing.launchFragmentInContainer
+import androidx.preference.ListPreference
 import androidx.preference.Preference
+import androidx.preference.PreferenceManager
 import androidx.test.espresso.Espresso.onView
 import androidx.test.espresso.action.ViewActions.click
 import androidx.test.espresso.assertion.ViewAssertions.matches
@@ -38,6 +40,7 @@ import eu.opencloud.android.R
 import eu.opencloud.android.presentation.releasenotes.ReleaseNotesActivity
 import eu.opencloud.android.presentation.settings.privacypolicy.PrivacyPolicyActivity
 import eu.opencloud.android.presentation.settings.SettingsFragment
+import eu.opencloud.android.presentation.settings.AppearanceMode
 import eu.opencloud.android.presentation.releasenotes.ReleaseNotesViewModel
 import eu.opencloud.android.presentation.settings.more.SettingsMoreViewModel
 import eu.opencloud.android.presentation.settings.SettingsViewModel
@@ -61,6 +64,7 @@ class SettingsFragmentTest {
     private lateinit var fragmentScenario: FragmentScenario<SettingsFragment>
 
     private var subsectionSecurity: Preference? = null
+    private var prefAppearance: ListPreference? = null
     private var subsectionLogging: Preference? = null
     private var subsectionPictureUploads: Preference? = null
     private var subsectionVideoUploads: Preference? = null
@@ -79,6 +83,7 @@ class SettingsFragmentTest {
     @Before
     fun setUp() {
         context = InstrumentationRegistry.getInstrumentation().targetContext
+        PreferenceManager.getDefaultSharedPreferences(context).edit().remove(AppearanceMode.PREFERENCE_KEY).commit()
         settingsViewModel = mockk(relaxed = true)
         moreViewModel = mockk(relaxed = true)
         releaseNotesViewModel = mockk(relaxed = true)
@@ -134,6 +139,7 @@ class SettingsFragmentTest {
         fragmentScenario = launchFragmentInContainer(themeResId = R.style.Theme_openCloud)
         fragmentScenario.onFragment { fragment ->
             subsectionSecurity = fragment.findPreference(SUBSECTION_SECURITY)
+            prefAppearance = fragment.findPreference(AppearanceMode.PREFERENCE_KEY)
             subsectionLogging = fragment.findPreference(SUBSECTION_LOGGING)
             subsectionPictureUploads = fragment.findPreference(SUBSECTION_PICTURE_UPLOADS)
             subsectionVideoUploads = fragment.findPreference(SUBSECTION_VIDEO_UPLOADS)
@@ -148,6 +154,24 @@ class SettingsFragmentTest {
     fun settingsViewCommon() {
         launchTest(attachedAccount = false)
 
+        assertEquals(
+            listOf(
+                context.getString(R.string.prefs_appearance_system),
+                context.getString(R.string.prefs_appearance_light),
+                context.getString(R.string.prefs_appearance_dark)
+            ),
+            prefAppearance?.entries?.toList()
+        )
+        assertEquals(AppearanceMode.entries.map { it.name }, prefAppearance?.entryValues?.map { it.toString() })
+        assertEquals(AppearanceMode.SYSTEM.name, prefAppearance?.value)
+        prefAppearance?.verifyPreference(
+            keyPref = AppearanceMode.PREFERENCE_KEY,
+            titlePref = context.getString(R.string.prefs_appearance),
+            summaryPref = context.getString(R.string.prefs_appearance_system),
+            visible = true,
+            enabled = true
+        )
+
         subsectionSecurity?.verifyPreference(
             keyPref = SUBSECTION_SECURITY,
             titlePref = context.getString(R.string.prefs_subsection_security),
@@ -195,6 +219,24 @@ class SettingsFragmentTest {
         )
     }
 
+    @Test
+    fun invalidAppearanceModeIsNormalizedToSystem() {
+        PreferenceManager.getDefaultSharedPreferences(context)
+            .edit()
+            .putString(AppearanceMode.PREFERENCE_KEY, "INVALID")
+            .commit()
+
+        launchTest(attachedAccount = false)
+
+        assertEquals(AppearanceMode.SYSTEM.name, prefAppearance?.value)
+        assertEquals(context.getString(R.string.prefs_appearance_system), prefAppearance?.summary)
+        assertEquals(
+            AppearanceMode.SYSTEM.name,
+            PreferenceManager.getDefaultSharedPreferences(context)
+                .getString(AppearanceMode.PREFERENCE_KEY, null)
+        )
+    }
+
     @Test
     fun settingsViewNoAccountAttached() {
         launchTest(attachedAccount = false)

opencloudApp/src/main/java/eu/opencloud/android/MainApp.kt

@@ -37,6 +37,7 @@ import android.os.Bundle
 import android.view.WindowManager
 import android.widget.CheckBox
 import androidx.appcompat.app.AlertDialog
+import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.content.pm.PackageInfoCompat
 import eu.opencloud.android.data.providers.implementation.OCSharedPreferencesProvider
 
@@ -64,6 +65,7 @@ import eu.opencloud.android.presentation.security.passcode.PassCodeManager
 import eu.opencloud.android.presentation.security.pattern.PatternActivity
 import eu.opencloud.android.presentation.security.pattern.PatternManager
 import eu.opencloud.android.presentation.settings.logging.SettingsLogsFragment.Companion.PREFERENCE_ENABLE_LOGGING
+import eu.opencloud.android.presentation.settings.AppearanceMode
 import eu.opencloud.android.providers.CoroutinesDispatcherProvider
 import eu.opencloud.android.providers.LogsProvider
 import eu.opencloud.android.providers.MdmProvider
@@ -103,6 +105,14 @@ class MainApp : Application() {
 
         appContext = applicationContext
 
+        val appearancePreferences = androidx.preference.PreferenceManager.getDefaultSharedPreferences(appContext)
+        val storedAppearanceMode = appearancePreferences.getString(AppearanceMode.PREFERENCE_KEY, null)
+        val appearanceMode = AppearanceMode.fromPreferenceValue(storedAppearanceMode)
+        if (storedAppearanceMode != appearanceMode.name) {
+            appearancePreferences.edit().putString(AppearanceMode.PREFERENCE_KEY, appearanceMode.name).apply()
+        }
+        AppCompatDelegate.setDefaultNightMode(appearanceMode.nightMode)
+
         // Ensure Logcat shows Timber logs in debug builds
         if (BuildConfig.DEBUG) {
             try {

opencloudApp/src/main/java/eu/opencloud/android/presentation/accounts/ManageAccountsDialogFragment.kt

@@ -30,7 +30,6 @@ import android.app.Dialog
 import android.content.Intent
 import android.os.Bundle
 import android.security.KeyChain
-import android.view.ContextThemeWrapper
 import android.view.View
 import android.widget.ImageView
 import android.widget.LinearLayout
@@ -79,7 +78,7 @@ class ManageAccountsDialogFragment : DialogFragment(), ManageAccountsAdapter.Acc
     }
 
     override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-        val builder = AlertDialog.Builder(ContextThemeWrapper(requireContext(), R.style.Theme_AppCompat_Dialog_Alert))
+        val builder = AlertDialog.Builder(requireContext())
         val inflater = this.layoutInflater
         dialogView = inflater.inflate(R.layout.manage_accounts_dialog, null)
         builder.setView(dialogView)

opencloudApp/src/main/java/eu/opencloud/android/presentation/files/filelist/FileListAdapter.kt

@@ -64,6 +64,24 @@ class FileListAdapter(
     private var fileListOption: FileListOption = FileListOption.ALL_FILES
     private val disallowTouchesWithOtherWindows =
         PreferenceUtils.shouldDisallowTouchesWithOtherVisibleWindows(context)
+    private val colorSurface by lazy {
+        context.obtainStyledAttributes(intArrayOf(R.attr.colorSurface)).run {
+            try {
+                getColor(0, Color.TRANSPARENT)
+            } finally {
+                recycle()
+            }
+        }
+    }
+    private val colorSelection by lazy {
+        context.obtainStyledAttributes(intArrayOf(R.attr.colorSelection)).run {
+            try {
+                getColor(0, Color.TRANSPARENT)
+            } finally {
+                recycle()
+            }
+        }
+    }
 
     init {
         setHasStableIds(true)
@@ -255,17 +273,17 @@ class FileListAdapter(
                     position = adapterPosition
                 )
             }
-            holder.itemView.setBackgroundColor(Color.WHITE)
+            holder.itemView.setBackgroundColor(colorSurface)
 
             val checkBoxV = holder.itemView.findViewById<ImageView>(R.id.custom_checkbox).apply {
                 isVisible = hasActiveSelection
             }
 
             if (isSelected(position)) {
-                holder.itemView.setBackgroundColor(ContextCompat.getColor(context, R.color.selected_item_background))
+                holder.itemView.setBackgroundColor(colorSelection)
                 checkBoxV.setImageResource(R.drawable.ic_checkbox_marked)
             } else {
-                holder.itemView.setBackgroundColor(Color.WHITE)
+                holder.itemView.setBackgroundColor(colorSurface)
                 checkBoxV.setImageResource(R.drawable.ic_checkbox_blank_outline)
             }
 

opencloudApp/src/main/java/eu/opencloud/android/presentation/settings/AppearanceMode.kt

@@ -0,0 +1,33 @@
+/**
+ * openCloud Android client application
+ *
+ * Copyright (C) 2026 openCloud GmbH.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package eu.opencloud.android.presentation.settings
+
+import androidx.appcompat.app.AppCompatDelegate
+
+enum class AppearanceMode(val nightMode: Int) {
+    SYSTEM(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM),
+    LIGHT(AppCompatDelegate.MODE_NIGHT_NO),
+    DARK(AppCompatDelegate.MODE_NIGHT_YES);
+
+    companion object {
+        const val PREFERENCE_KEY = "appearance_mode"
+
+        fun fromPreferenceValue(value: String?) = entries.firstOrNull { it.name == value } ?: SYSTEM
+    }
+}

opencloudApp/src/main/java/eu/opencloud/android/presentation/settings/SettingsFragment.kt

@@ -27,6 +27,8 @@ import android.content.Intent
 import android.os.Build
 import android.os.Bundle
 import android.provider.Settings
+import androidx.appcompat.app.AppCompatDelegate
+import androidx.preference.ListPreference
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.PreferenceScreen
@@ -47,6 +49,7 @@ class SettingsFragment : PreferenceFragmentCompat() {
     private val releaseNotesViewModel by viewModel<ReleaseNotesViewModel>()
 
     private var settingsScreen: PreferenceScreen? = null
+    private var prefAppearance: ListPreference? = null
     private var subsectionPictureUploads: Preference? = null
     private var subsectionVideoUploads: Preference? = null
     private var subsectionMore: Preference? = null
@@ -59,6 +62,22 @@ class SettingsFragment : PreferenceFragmentCompat() {
         setPreferencesFromResource(R.xml.settings, rootKey)
 
         settingsScreen = findPreference(SCREEN_SETTINGS)
+        prefAppearance = findPreference<ListPreference>(AppearanceMode.PREFERENCE_KEY)?.apply {
+            entries = arrayOf(
+                getString(R.string.prefs_appearance_system),
+                getString(R.string.prefs_appearance_light),
+                getString(R.string.prefs_appearance_dark)
+            )
+            entryValues = AppearanceMode.entries.map { it.name }.toTypedArray()
+            value = AppearanceMode.fromPreferenceValue(value).name
+            summary = entry
+            setOnPreferenceChangeListener { preference, newValue ->
+                val appearanceMode = AppearanceMode.fromPreferenceValue(newValue as String)
+                preference.summary = entries[findIndexOfValue(appearanceMode.name)]
+                AppCompatDelegate.setDefaultNightMode(appearanceMode.nightMode)
+                true
+            }
+        }
         subsectionPictureUploads = findPreference(SUBSECTION_PICTURE_UPLOADS)
         subsectionVideoUploads = findPreference(SUBSECTION_VIDEO_UPLOADS)
         subsectionMore = findPreference(SUBSECTION_MORE)

opencloudApp/src/main/res/drawable/list_selector.xml

@@ -20,8 +20,8 @@
 
 <selector xmlns:android="http://schemas.android.com/apk/res/android" android:exitFadeDuration="@android:integer/config_mediumAnimTime">
 
-    <item android:drawable="@color/opencloud_blue_bright" android:state_pressed="true" />
-    <item android:drawable="@color/opencloud_blue_bright" android:state_focused="true" />
-    <item android:drawable="@color/background_color" />
+    <item android:drawable="?attr/colorSelection" android:state_pressed="true" />
+    <item android:drawable="?attr/colorSelection" android:state_focused="true" />
+    <item android:drawable="?android:attr/colorBackground" />
 
 </selector>

opencloudApp/src/main/res/drawable/numberkeyboard_key_bg_pressed.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="oval">
-    <solid android:color="@color/white_pressed" />
+    <solid android:color="?attr/colorSelection" />
 </shape>

opencloudApp/src/main/res/drawable/top_progress_bar_determinate.xml

@@ -4,7 +4,7 @@
 
     <item
         android:id="@android:id/background"
-        android:drawable="@color/background_color" />
+        android:drawable="?attr/colorSurface" />
     <item android:id="@android:id/secondaryProgress">
         <scale
             android:drawable="@color/actionbar_start_color"

opencloudApp/src/main/res/layout/account_action.xml

@@ -35,7 +35,7 @@
         app:layout_constraintEnd_toStartOf="@+id/name"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent"
-        app:tint="@color/black" />
+        app:tint="?attr/colorOnSurface" />
 
     <TextView
         android:id="@+id/name"
@@ -44,7 +44,7 @@
         android:gravity="center_vertical"
         android:paddingEnd="@dimen/standard_padding"
         android:text="@string/placeholder_filename"
-        android:textColor="@color/black"
+        android:textColor="?attr/colorOnSurface"
         android:textSize="@dimen/two_line_primary_text_size"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent"

opencloudApp/src/main/res/layout/account_item.xml

@@ -65,7 +65,7 @@
             android:gravity="bottom"
             android:maxLines="1"
             android:text="@string/placeholder_filename"
-            android:textColor="@color/textColor"
+            android:textColor="?attr/colorOnSurface"
             android:textSize="16sp"
             android:textStyle="bold"
             app:layout_constraintBottom_toTopOf="@+id/account"
@@ -80,7 +80,7 @@
             android:layout_marginStart="8dp"
             android:ellipsize="middle"
             android:text="@string/placeholder_sentence"
-            android:textColor="@color/textColor"
+            android:textColor="?attr/colorOnSurfaceVariant"
             android:textSize="14sp"
             android:lines="1"
             app:layout_constraintEnd_toStartOf="@+id/mtls_account_button"
@@ -103,7 +103,7 @@
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@+id/clean_account_local_storage_button"
             app:layout_constraintTop_toTopOf="parent"
-            app:tint="@color/black" />
+            app:tint="?attr/colorOnSurface" />
 
         <ImageView
             android:id="@+id/clean_account_local_storage_button"
@@ -121,7 +121,7 @@
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toStartOf="@+id/removeButton"
             app:layout_constraintTop_toTopOf="parent"
-            app:tint="@color/black" />
+            app:tint="?attr/colorOnSurface" />
 
         <ImageView
             android:id="@+id/removeButton"
@@ -139,7 +139,7 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toTopOf="parent"
             android:contentDescription="@string/content_description_remove_account"
-            app:tint="@color/black" />
+            app:tint="?attr/colorOnSurface" />
 
     </androidx.constraintlayout.widget.ConstraintLayout>
 
@@ -156,7 +156,7 @@
             android:text="@string/used_quota_title_manage_accounts"
             android:layout_marginEnd="@dimen/item_file_grid_margin"
             android:textSize="@dimen/two_line_secondary_text_size"
-            android:textColor="@color/textColor"/>
+            android:textColor="?attr/colorOnSurfaceVariant"/>
 
         <ProgressBar
             android:id="@+id/manage_accounts_quota_bar"
@@ -171,7 +171,7 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:text="@string/drawer_loading_quota"
-            android:textColor="@color/textColor"
+            android:textColor="?attr/colorOnSurfaceVariant"
             android:textSize="@dimen/two_line_secondary_text_size" />
     </LinearLayout>
 

opencloudApp/src/main/res/layout/activity_pattern_lock.xml

@@ -32,7 +32,7 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:background="@color/background_color"
+        android:background="?android:attr/colorBackground"
         android:paddingHorizontal="@dimen/standard_padding"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
@@ -45,7 +45,7 @@
             android:layout_height="wrap_content"
             android:layout_marginTop="@dimen/standard_margin"
             android:text="@string/pass_code_enter_pass_code"
-            android:textColor="@android:color/black"
+            android:textColor="?attr/colorOnSurface"
             android:textSize="16sp"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
@@ -59,6 +59,7 @@
             android:gravity="center"
             android:text="@string/pattern_configure_your_pattern_explanation"
             android:textAppearance="@android:style/TextAppearance.Small"
+            android:textColor="?attr/colorOnSurfaceVariant"
             android:textSize="14sp"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"