android: Implement Hide All 3DS Images from Android setting

Co-Authored-By: Reg Tiangha <rtiangha@users.noreply.github.com>
Co-authored-by: OpenSauce04 <opensauce04@gmail.com>

src/android/app/src/main/java/org/citra/citra_emu/features/settings/model/BooleanSetting.kt

@@ -49,7 +49,8 @@ enum class BooleanSetting(
     DISABLE_RIGHT_EYE_RENDER("disable_right_eye_render", Settings.SECTION_RENDERER, false),
     USE_ARTIC_BASE_CONTROLLER("use_artic_base_controller", Settings.SECTION_CONTROLS, false),
     UPRIGHT_SCREEN("upright_screen", Settings.SECTION_LAYOUT, false),
-    COMPRESS_INSTALLED_CIA_CONTENT("compress_cia_installs", Settings.SECTION_STORAGE, false);
+    COMPRESS_INSTALLED_CIA_CONTENT("compress_cia_installs", Settings.SECTION_STORAGE, false),
+    ANDROID_HIDE_IMAGES("android_hide_images", Settings.SECTION_CORE, false);
 
     override var boolean: Boolean = defaultValue
 
@@ -83,6 +84,7 @@ enum class BooleanSetting(
             SHADERS_ACCURATE_MUL,
             USE_ARTIC_BASE_CONTROLLER,
             COMPRESS_INSTALLED_CIA_CONTENT,
+            ANDROID_HIDE_IMAGES
         )
 
         fun from(key: String): BooleanSetting? =

src/android/app/src/main/java/org/citra/citra_emu/features/settings/ui/SettingsActivityPresenter.kt

@@ -4,14 +4,19 @@
 
 package org.citra.citra_emu.features.settings.ui
 
+import android.net.Uri
 import android.os.Bundle
 import android.text.TextUtils
+import androidx.documentfile.provider.DocumentFile
+import org.citra.citra_emu.CitraApplication
 import org.citra.citra_emu.NativeLibrary
-import org.citra.citra_emu.features.settings.model.IntSetting
+import org.citra.citra_emu.features.settings.model.BooleanSetting
 import org.citra.citra_emu.features.settings.model.Settings
 import org.citra.citra_emu.utils.SystemSaveGame
 import org.citra.citra_emu.utils.DirectoryInitialization
+import org.citra.citra_emu.utils.FileUtil
 import org.citra.citra_emu.utils.Log
+import org.citra.citra_emu.utils.PermissionsHandler
 import org.citra.citra_emu.utils.TurboHelper
 
 class SettingsActivityPresenter(private val activityView: SettingsActivityView) {
@@ -60,6 +65,32 @@ class SettingsActivityPresenter(private val activityView: SettingsActivityView)
         loadSettingsUI()
     }
 
+    private fun updateAndroidImageVisibility() {
+        val dataDirTreeUri: Uri
+        val dataDirDocument: DocumentFile
+        val nomediaFileDocument: DocumentFile?
+        val nomediaFileExists: Boolean
+        try {
+            dataDirTreeUri = PermissionsHandler.citraDirectory
+            dataDirDocument = DocumentFile.fromTreeUri(CitraApplication.appContext, dataDirTreeUri)!!
+            nomediaFileDocument = dataDirDocument.findFile(".nomedia")
+            nomediaFileExists = (nomediaFileDocument != null)
+        } catch (e: Exception) {
+            Log.error("[SettingsActivity]: Error occurred while trying to find .nomedia, error: " + e.message)
+            return
+        }
+
+        if (BooleanSetting.ANDROID_HIDE_IMAGES.boolean) {
+            if (!nomediaFileExists) {
+                Log.info("[SettingsActivity]: Attempting to create .nomedia in user data directory")
+                FileUtil.createFile(dataDirTreeUri.toString(), ".nomedia")
+            }
+        } else if (nomediaFileExists) {
+            Log.info("[SettingsActivity]: Attempting to delete .nomedia in user data directory")
+            nomediaFileDocument!!.delete()
+        }
+    }
+
     fun onStop(finishing: Boolean) {
         if (finishing && shouldSave) {
             Log.debug("[SettingsActivity] Settings activity stopping. Saving settings to INI...")
@@ -67,6 +98,7 @@ class SettingsActivityPresenter(private val activityView: SettingsActivityView)
             //added to ensure that layout changes take effect as soon as settings window closes
             NativeLibrary.reloadSettings()
             NativeLibrary.updateFramebuffer(NativeLibrary.isPortraitMode)
+            updateAndroidImageVisibility()
             TurboHelper.reloadTurbo(false) // TODO: Can this go somewhere else? -OS
         }
         NativeLibrary.reloadSettings()

src/android/app/src/main/java/org/citra/citra_emu/features/settings/ui/SettingsFragmentPresenter.kt

@@ -248,6 +248,15 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
                     IntSetting.TURBO_LIMIT.defaultValue.toFloat()
                 )
             )
+            add(
+                SwitchSetting(
+                    BooleanSetting.ANDROID_HIDE_IMAGES,
+                    R.string.android_hide_images,
+                    R.string.android_hide_images_description,
+                    BooleanSetting.ANDROID_HIDE_IMAGES.key,
+                    BooleanSetting.ANDROID_HIDE_IMAGES.defaultValue
+                )
+            )
         }
     }
 

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

@@ -257,6 +257,8 @@
     <string name="frame_limit_enable_description">When enabled, emulation speed will be limited to a specified percentage of normal speed. If disabled, emulation speed will be uncapped and the turbo speed hotkey will not work.</string>
     <string name="frame_limit_slider">Limit Speed Percent</string>
     <string name="frame_limit_slider_description">Specifies the percentage to limit emulation speed. With the default of 100% emulation will be limited to normal speed. Values higher or lower will increase or decrease the speed limit.</string>
+    <string name="android_hide_images">Hide 3DS Images from Android</string>
+    <string name="android_hide_images_description">Prevent 3DS camera, screenshot, and custom texture images from being indexed by Android and displayed in the gallery. Your device may need to be rebooted after changing this setting to take effect.</string>
     <string name="turbo_limit">Turbo Speed Limit</string>
     <string name="turbo_limit_description">Emulation speed limit used while the turbo hotkey is active.</string>
     <string name="expand_to_cutout_area">Expand to Cutout Area</string>