[android,ui] feat fullscreen app setting (#3676)

why not? i like it a lot on both phone and TV.
toggle in app settings. disabled by default so no hassle.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3676
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Co-authored-by: xbzk <xbzk@eden-emu.dev>
Co-committed-by: xbzk <xbzk@eden-emu.dev>

src/android/app/src/main/java/org/yuzu/yuzu_emu/dialogs/ChatDialog.kt

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 package org.yuzu.yuzu_emu.dialogs
@@ -20,6 +20,8 @@ import org.yuzu.yuzu_emu.databinding.DialogChatBinding
 import org.yuzu.yuzu_emu.databinding.ItemChatMessageBinding
 import org.yuzu.yuzu_emu.features.settings.model.StringSetting
 import org.yuzu.yuzu_emu.network.NetPlayManager
+import org.yuzu.yuzu_emu.utils.CompatUtils
+import org.yuzu.yuzu_emu.utils.FullscreenHelper
 import java.text.SimpleDateFormat
 import java.util.*
 
@@ -34,6 +36,13 @@ class ChatDialog(context: Context) : BottomSheetDialog(context) {
     private lateinit var binding: DialogChatBinding
     private lateinit var chatAdapter: ChatAdapter
     private val handler = Handler(Looper.getMainLooper())
+    private val hideSystemBars: Boolean by lazy {
+        runCatching {
+            FullscreenHelper.shouldHideSystemBars(CompatUtils.findActivity(context))
+        }.getOrElse {
+            FullscreenHelper.isFullscreenEnabled(context)
+        }
+    }
 
     // TODO(alekpop, crueter): Top drawer for message notifications, perhaps use system notifs?
     // TODO(alekpop, crueter): Context menu actions for chat users
@@ -41,6 +50,7 @@ class ChatDialog(context: Context) : BottomSheetDialog(context) {
     @SuppressLint("NotifyDataSetChanged")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setOnShowListener { applyFullscreenMode() }
         binding = DialogChatBinding.inflate(LayoutInflater.from(context))
         setContentView(binding.root)
 
@@ -75,6 +85,11 @@ class ChatDialog(context: Context) : BottomSheetDialog(context) {
         }
     }
 
+    override fun onStart() {
+        super.onStart()
+        applyFullscreenMode()
+    }
+
     override fun dismiss() {
         NetPlayManager.setChatOpen(false)
         super.dismiss()
@@ -108,6 +123,12 @@ class ChatDialog(context: Context) : BottomSheetDialog(context) {
     private fun scrollToBottom() {
         binding.chatRecyclerView.scrollToPosition(chatAdapter.itemCount - 1)
     }
+
+    private fun applyFullscreenMode() {
+        window?.let { window ->
+            FullscreenHelper.applyToWindow(window, hideSystemBars)
+        }
+    }
 }
 
 class ChatAdapter(private val messages: List<ChatMessage>) :

src/android/app/src/main/java/org/yuzu/yuzu_emu/dialogs/LobbyBrowser.kt

@@ -31,15 +31,25 @@ import org.yuzu.yuzu_emu.databinding.DialogLobbyBrowserBinding
 import org.yuzu.yuzu_emu.databinding.ItemLobbyRoomBinding
 import org.yuzu.yuzu_emu.features.settings.model.StringSetting
 import org.yuzu.yuzu_emu.network.NetPlayManager
+import org.yuzu.yuzu_emu.utils.CompatUtils
+import org.yuzu.yuzu_emu.utils.FullscreenHelper
 import java.util.Locale
 
 class LobbyBrowser(context: Context) : BottomSheetDialog(context) {
     private lateinit var binding: DialogLobbyBrowserBinding
     private lateinit var adapter: LobbyRoomAdapter
     private val handler = Handler(Looper.getMainLooper())
+    private val hideSystemBars: Boolean by lazy {
+        runCatching {
+            FullscreenHelper.shouldHideSystemBars(CompatUtils.findActivity(context))
+        }.getOrElse {
+            FullscreenHelper.isFullscreenEnabled(context)
+        }
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setOnShowListener { applyFullscreenMode() }
 
         behavior.state = BottomSheetBehavior.STATE_EXPANDED
         behavior.skipCollapsed =
@@ -81,6 +91,7 @@ class LobbyBrowser(context: Context) : BottomSheetDialog(context) {
         behavior.expandedOffset = 0
         behavior.skipCollapsed = true
         behavior.state = BottomSheetBehavior.STATE_EXPANDED
+        applyFullscreenMode()
     }
 
     private fun setupRecyclerView() {
@@ -274,4 +285,10 @@ class LobbyBrowser(context: Context) : BottomSheetDialog(context) {
     }
 
     private inner class ScoreItem(val score: Double, val item: NetPlayManager.RoomInfo)
+
+    private fun applyFullscreenMode() {
+        window?.let { window ->
+            FullscreenHelper.applyToWindow(window, hideSystemBars)
+        }
+    }
 }

src/android/app/src/main/java/org/yuzu/yuzu_emu/dialogs/NetPlayDialog.kt

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 package org.yuzu.yuzu_emu.dialogs
@@ -36,6 +36,7 @@ import org.yuzu.yuzu_emu.features.settings.model.StringSetting
 import org.yuzu.yuzu_emu.network.NetDataValidators
 import org.yuzu.yuzu_emu.network.NetPlayManager
 import org.yuzu.yuzu_emu.utils.CompatUtils
+import org.yuzu.yuzu_emu.utils.FullscreenHelper
 import org.yuzu.yuzu_emu.utils.GameHelper
 
 class NetPlayDialog(context: Context) : BottomSheetDialog(context) {
@@ -43,9 +44,17 @@ class NetPlayDialog(context: Context) : BottomSheetDialog(context) {
 
     private val gameNameList: MutableList<Array<String>> = mutableListOf()
     private val gameIdList: MutableList<Array<Long>> = mutableListOf()
+    private val hideSystemBars: Boolean by lazy {
+        runCatching {
+            FullscreenHelper.shouldHideSystemBars(CompatUtils.findActivity(context))
+        }.getOrElse {
+            FullscreenHelper.isFullscreenEnabled(context)
+        }
+    }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        setOnShowListener { applyFullscreenMode() }
 
         behavior.state = BottomSheetBehavior.STATE_EXPANDED
         behavior.state = BottomSheetBehavior.STATE_EXPANDED
@@ -118,6 +127,11 @@ class NetPlayDialog(context: Context) : BottomSheetDialog(context) {
         }
     }
 
+    override fun onStart() {
+        super.onStart()
+        applyFullscreenMode()
+    }
+
     data class NetPlayItems(
         val option: Int,
         val name: String,
@@ -352,6 +366,11 @@ class NetPlayDialog(context: Context) : BottomSheetDialog(context) {
         TextValidatorWatcher.validStates.clear()
         val activity = CompatUtils.findActivity(context)
         val dialog = BottomSheetDialog(activity)
+        dialog.setOnShowListener {
+            dialog.window?.let { window ->
+                FullscreenHelper.applyToWindow(window, hideSystemBars)
+            }
+        }
 
         dialog.behavior.state = BottomSheetBehavior.STATE_EXPANDED
         dialog.behavior.state = BottomSheetBehavior.STATE_EXPANDED
@@ -582,6 +601,12 @@ class NetPlayDialog(context: Context) : BottomSheetDialog(context) {
         dialog.show()
     }
 
+    private fun applyFullscreenMode() {
+        window?.let { window ->
+            FullscreenHelper.applyToWindow(window, hideSystemBars)
+        }
+    }
+
     private fun showModerationDialog() {
         val activity = CompatUtils.findActivity(context)
         val dialog = MaterialAlertDialogBuilder(activity)

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/model/Settings.kt

@@ -104,6 +104,8 @@ object Settings {
     const val PREF_THEME_MODE = "ThemeMode"
     const val PREF_BLACK_BACKGROUNDS = "BlackBackgrounds"
     const val PREF_STATIC_THEME_COLOR = "StaticThemeColor"
+    const val PREF_APP_FULLSCREEN = "AppFullscreen"
+    const val APP_FULLSCREEN_DEFAULT = false
 
     enum class EmulationOrientation(val int: Int) {
         Unspecified(0),

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsActivity.kt

@@ -103,6 +103,7 @@ class SettingsActivity : AppCompatActivity() {
         )
 
         setInsets()
+        applyFullscreenPreference()
     }
 
     fun navigateBack() {
@@ -122,6 +123,18 @@ class SettingsActivity : AppCompatActivity() {
         }
     }
 
+    override fun onResume() {
+        super.onResume()
+        applyFullscreenPreference()
+    }
+
+    override fun onWindowFocusChanged(hasFocus: Boolean) {
+        super.onWindowFocusChanged(hasFocus)
+        if (hasFocus) {
+            applyFullscreenPreference()
+        }
+    }
+
     override fun onStop() {
         super.onStop()
         Log.info("[SettingsActivity] Settings activity stopping. Saving settings to INI...")
@@ -188,4 +201,8 @@ class SettingsActivity : AppCompatActivity() {
             windowInsets
         }
     }
+
+    private fun applyFullscreenPreference() {
+        FullscreenHelper.applyToActivity(this)
+    }
 }

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -29,6 +29,8 @@ import org.yuzu.yuzu_emu.features.settings.model.view.*
 import org.yuzu.yuzu_emu.utils.InputHandler
 import org.yuzu.yuzu_emu.utils.NativeConfig
 import org.yuzu.yuzu_emu.utils.DirectoryInitialization
+import org.yuzu.yuzu_emu.utils.FullscreenHelper
+import androidx.core.content.edit
 import androidx.fragment.app.FragmentActivity
 import org.yuzu.yuzu_emu.fragments.MessageDialogFragment
 
@@ -1187,6 +1189,39 @@ class SettingsFragmentPresenter(
                 )
             )
 
+            val fullscreenSetting: AbstractBooleanSetting = object : AbstractBooleanSetting {
+                override fun getBoolean(needsGlobal: Boolean): Boolean =
+                    FullscreenHelper.isFullscreenEnabled(context)
+
+                override fun setBoolean(value: Boolean) {
+                    FullscreenHelper.setFullscreenEnabled(context, value)
+                    settingsViewModel.setShouldRecreate(true)
+                }
+
+                override val key: String = Settings.PREF_APP_FULLSCREEN
+                override val isRuntimeModifiable: Boolean = true
+                override val pairedSettingKey: String = ""
+                override val isSwitchable: Boolean = false
+                override var global: Boolean = true
+                override val isSaveable: Boolean = true
+                override val defaultValue: Boolean = Settings.APP_FULLSCREEN_DEFAULT
+
+                override fun getValueAsString(needsGlobal: Boolean): String =
+                    getBoolean(needsGlobal).toString()
+
+                override fun reset() {
+                    setBoolean(defaultValue)
+                }
+            }
+
+            add(
+                SwitchSetting(
+                    fullscreenSetting,
+                    titleId = R.string.fullscreen_mode,
+                    descriptionId = R.string.fullscreen_mode_description
+                )
+            )
+
             add(HeaderSetting(R.string.buttons))
             add(BooleanSetting.ENABLE_FOLDER_BUTTON.key)
             add(BooleanSetting.ENABLE_QLAUNCH_BUTTON.key)

src/android/app/src/main/java/org/yuzu/yuzu_emu/features/settings/ui/SettingsSubscreenActivity.kt

@@ -20,6 +20,7 @@ import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.YuzuApplication
 import org.yuzu.yuzu_emu.databinding.ActivitySettingsBinding
 import org.yuzu.yuzu_emu.utils.DirectoryInitialization
+import org.yuzu.yuzu_emu.utils.FullscreenHelper
 import org.yuzu.yuzu_emu.utils.InsetsHelper
 import org.yuzu.yuzu_emu.utils.ThemeHelper
 
@@ -89,6 +90,7 @@ class SettingsSubscreenActivity : AppCompatActivity() {
         )
 
         setInsets()
+        applyFullscreenPreference()
     }
 
     override fun onStart() {
@@ -98,6 +100,18 @@ class SettingsSubscreenActivity : AppCompatActivity() {
         }
     }
 
+    override fun onResume() {
+        super.onResume()
+        applyFullscreenPreference()
+    }
+
+    override fun onWindowFocusChanged(hasFocus: Boolean) {
+        super.onWindowFocusChanged(hasFocus)
+        if (hasFocus) {
+            applyFullscreenPreference()
+        }
+    }
+
     fun navigateBack() {
         val navHostFragment =
             supportFragmentManager.findFragmentById(R.id.fragment_container) as NavHostFragment
@@ -149,4 +163,8 @@ class SettingsSubscreenActivity : AppCompatActivity() {
             windowInsets
         }
     }
+
+    private fun applyFullscreenPreference() {
+        FullscreenHelper.applyToActivity(this)
+    }
 }

src/android/app/src/main/java/org/yuzu/yuzu_emu/fragments/ProfileManagerFragment.kt

@@ -9,6 +9,7 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.updatePadding
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.navigation.fragment.findNavController
@@ -22,6 +23,7 @@ import org.yuzu.yuzu_emu.databinding.FragmentProfileManagerBinding
 import org.yuzu.yuzu_emu.model.HomeViewModel
 import org.yuzu.yuzu_emu.model.UserProfile
 import org.yuzu.yuzu_emu.utils.NativeConfig
+import org.yuzu.yuzu_emu.utils.ViewUtils.updateMargins
 
 class ProfileManagerFragment : Fragment() {
     private var _binding: FragmentProfileManagerBinding? = null
@@ -172,11 +174,19 @@ class ProfileManagerFragment : Fragment() {
             val leftInsets = barInsets.left + cutoutInsets.left
             val rightInsets = barInsets.right + cutoutInsets.right
 
-            val fabLayoutParams = binding.buttonAddUser.layoutParams as ViewGroup.MarginLayoutParams
-            fabLayoutParams.leftMargin = leftInsets + 24
-            fabLayoutParams.rightMargin = rightInsets + 24
-            fabLayoutParams.bottomMargin = barInsets.bottom + 24
-            binding.buttonAddUser.layoutParams = fabLayoutParams
+            binding.toolbarProfiles.updateMargins(left = leftInsets, right = rightInsets)
+            binding.listProfiles.updateMargins(left = leftInsets, right = rightInsets)
+            binding.listProfiles.updatePadding(
+                bottom = barInsets.bottom +
+                    resources.getDimensionPixelSize(R.dimen.spacing_bottom_list_fab)
+            )
+
+            val fabSpacing = resources.getDimensionPixelSize(R.dimen.spacing_fab)
+            binding.buttonAddUser.updateMargins(
+                left = leftInsets + fabSpacing,
+                right = rightInsets + fabSpacing,
+                bottom = barInsets.bottom + fabSpacing
+            )
 
             windowInsets
         }

src/android/app/src/main/java/org/yuzu/yuzu_emu/ui/main/MainActivity.kt

@@ -169,6 +169,7 @@ class MainActivity : AppCompatActivity(), ThemeProvider {
              checkForUpdates()
         }
         setInsets()
+        applyFullscreenPreference()
     }
 
     private fun checkForUpdates() {
@@ -345,6 +346,14 @@ class MainActivity : AppCompatActivity(), ThemeProvider {
     override fun onResume() {
         ThemeHelper.setCorrectTheme(this)
         super.onResume()
+        applyFullscreenPreference()
+    }
+
+    override fun onWindowFocusChanged(hasFocus: Boolean) {
+        super.onWindowFocusChanged(hasFocus)
+        if (hasFocus) {
+            applyFullscreenPreference()
+        }
     }
 
     private fun setInsets() = ViewCompat.setOnApplyWindowInsetsListener(
@@ -364,6 +373,10 @@ class MainActivity : AppCompatActivity(), ThemeProvider {
         windowInsets
     }
 
+    private fun applyFullscreenPreference() {
+        FullscreenHelper.applyToActivity(this)
+    }
+
     override fun setTheme(resId: Int) {
         super.setTheme(resId)
         themeId = resId

src/android/app/src/main/java/org/yuzu/yuzu_emu/utils/FullscreenHelper.kt

@@ -0,0 +1,52 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package org.yuzu.yuzu_emu.utils
+
+import android.app.Activity
+import android.content.Context
+import android.view.Window
+import androidx.core.content.edit
+import androidx.core.view.ViewCompat
+import androidx.core.view.WindowInsetsCompat
+import androidx.core.view.WindowInsetsControllerCompat
+import androidx.preference.PreferenceManager
+import org.yuzu.yuzu_emu.features.settings.model.Settings
+
+object FullscreenHelper {
+    fun isFullscreenEnabled(context: Context): Boolean {
+        return PreferenceManager.getDefaultSharedPreferences(context).getBoolean(
+            Settings.PREF_APP_FULLSCREEN,
+            Settings.APP_FULLSCREEN_DEFAULT
+        )
+    }
+
+    fun setFullscreenEnabled(context: Context, enabled: Boolean) {
+        PreferenceManager.getDefaultSharedPreferences(context).edit {
+            putBoolean(Settings.PREF_APP_FULLSCREEN, enabled)
+        }
+    }
+
+    fun shouldHideSystemBars(activity: Activity): Boolean {
+        val rootInsets = ViewCompat.getRootWindowInsets(activity.window.decorView)
+        val barsCurrentlyHidden =
+            rootInsets?.isVisible(WindowInsetsCompat.Type.systemBars())?.not() ?: false
+        return isFullscreenEnabled(activity) || barsCurrentlyHidden
+    }
+
+    fun applyToWindow(window: Window, hideSystemBars: Boolean) {
+        val controller = WindowInsetsControllerCompat(window, window.decorView)
+
+        if (hideSystemBars) {
+            controller.hide(WindowInsetsCompat.Type.systemBars())
+            controller.systemBarsBehavior =
+                WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+        } else {
+            controller.show(WindowInsetsCompat.Type.systemBars())
+        }
+    }
+
+    fun applyToActivity(activity: Activity) {
+        applyToWindow(activity.window, isFullscreenEnabled(activity))
+    }
+}

src/android/app/src/main/res/layout/fragment_profile_manager.xml

@@ -5,21 +5,22 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="?attr/colorSurface"
-    android:fitsSystemWindows="true">
+    android:background="?attr/colorSurface">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appbar"
         style="@style/Widget.Eden.TransparentTopAppBarLayout"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:fitsSystemWindows="true">
+        android:fitsSystemWindows="true"
+        android:touchscreenBlocksFocus="false">
 
         <com.google.android.material.appbar.MaterialToolbar
             android:id="@+id/toolbar_profiles"
             style="@style/Widget.Eden.TransparentTopToolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize"
+            android:touchscreenBlocksFocus="false"
             app:title="@string/profile_manager"
             app:navigationIcon="@drawable/ic_back"
             app:titleCentered="false" />

src/android/app/src/main/res/values/strings.xml

@@ -1160,6 +1160,8 @@
     <string name="theme_material_you">Material You</string>
     <string name="app_settings">App Settings</string>
     <string name="theme_and_color">Theme And Color</string>
+    <string name="fullscreen_mode">Fullscreen mode</string>
+    <string name="fullscreen_mode_description">Hide Android system bars across app screens. Swipe from an edge to reveal them temporarily.</string>
 
     <!-- Theme Modes -->
     <string name="change_theme_mode">Change theme mode</string>