feat fullscreen app setting

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

@@ -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
 
 // SPDX-FileCopyrightText: 2023 yuzu Emulator Project
@@ -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

@@ -31,6 +31,7 @@ import org.yuzu.yuzu_emu.utils.GpuDriverHelper
 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
@@ -1201,6 +1202,39 @@ 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/ui/main/MainActivity.kt

@@ -177,6 +177,7 @@ class MainActivity : AppCompatActivity(), ThemeProvider {
              checkForUpdates()
         }
         setInsets()
+        applyFullscreenPreference()
     }
 
     private fun checkForUpdates() {
@@ -353,6 +354,14 @@ 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(
@@ -372,6 +381,10 @@ 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 +1,39 @@
+// 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 androidx.core.content.edit
+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 applyToActivity(activity: Activity) {
+        val controller = WindowInsetsControllerCompat(activity.window, activity.window.decorView)
+
+        if (isFullscreenEnabled(activity)) {
+            controller.hide(WindowInsetsCompat.Type.systemBars())
+            controller.systemBarsBehavior =
+                WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
+        } else {
+            controller.show(WindowInsetsCompat.Type.systemBars())
+        }
+    }
+}

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>