android: Persist settings across configuration changes

Mostly things get refactored here to remove previous assumptions made about how the activity/fragment lifecycles would operate. The important change for persistence is removing the assumption that the user will be at the first settings fragment on recreation when deciding whether or not to reload settings. Now we check a flag in Settings to know if we loaded the settings within this lifecycle.

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

@@ -13,6 +13,8 @@ import java.util.*
 class Settings {
     private var gameId: String? = null
 
+    var isLoaded = false
+
     /**
      * A HashMap<String></String>, SettingSection> that constructs a new SettingSection instead of returning null
      * when getting a key not already in the map
@@ -43,6 +45,7 @@ class Settings {
         if (!TextUtils.isEmpty(gameId)) {
             loadCustomGameSettings(gameId!!, view)
         }
+        isLoaded = true
     }
 
     private fun loadYuzuSettings(view: SettingsActivityView) {

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

@@ -3,5 +3,5 @@ package org.yuzu.yuzu_emu.features.settings.model
 import androidx.lifecycle.ViewModel
 
 class SettingsViewModel : ViewModel() {
-    var settings = Settings()
+    val settings = Settings()
 }

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

@@ -35,11 +35,7 @@ class SettingsActivity : AppCompatActivity(), SettingsActivityView {
 
     private val settingsViewModel: SettingsViewModel by viewModels()
 
-    override var settings: Settings
+    override val settings: Settings get() = settingsViewModel.settings
-        get() = settingsViewModel.settings
-        set(settings) {
-            settingsViewModel.settings = settings
-        }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         ThemeHelper.setTheme(this)
@@ -179,14 +175,14 @@ class SettingsActivity : AppCompatActivity(), SettingsActivityView {
         ).show()
     }
 
-    override fun onSettingsFileLoaded(settings: Settings) {
+    override fun onSettingsFileLoaded() {
         val fragment: SettingsFragmentView? = settingsFragment
-        fragment?.onSettingsFileLoaded(settings)
+        fragment?.loadSettingsList()
     }
 
     override fun onSettingsFileNotFound() {
         val fragment: SettingsFragmentView? = settingsFragment
-        fragment?.loadDefaultSettings()
+        fragment?.loadSettingsList()
     }
 
     override fun showToastMessage(message: String, is_long: Boolean) {

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

@@ -36,7 +36,7 @@ class SettingsActivityPresenter(private val activityView: SettingsActivityView)
     }
 
     private fun loadSettingsUI() {
-        if (settings.isEmpty) {
+        if (!settings.isLoaded) {
             if (!TextUtils.isEmpty(gameId)) {
                 settings.loadSettings(gameId, activityView)
             } else {
@@ -44,7 +44,7 @@ class SettingsActivityPresenter(private val activityView: SettingsActivityView)
             }
         }
         activityView.showSettingsFragment(menuTag, false, gameId)
-        activityView.onSettingsFileLoaded(settings)
+        activityView.onSettingsFileLoaded()
     }
 
     private fun prepareDirectoriesIfNeeded() {

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

@@ -24,19 +24,17 @@ interface SettingsActivityView {
      * loaded from disk, so that each Fragment doesn't need to perform its own
      * read operation.
      *
-     * @return A possibly null HashMap of Settings.
+     * @return A HashMap of Settings.
      */
-    var settings: Settings
+    val settings: Settings
 
     /**
-     * Called when an asynchronous load operation completes.
+     * Called when a load operation completes.
-     *
-     * @param settings The (possibly null) result of the ini load operation.
      */
-    fun onSettingsFileLoaded(settings: Settings)
+    fun onSettingsFileLoaded()
 
     /**
-     * Called when an asynchronous load operation fails.
+     * Called when a load operation fails.
      */
     fun onSettingsFileNotFound()
 

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

@@ -12,6 +12,7 @@ import android.view.LayoutInflater
 import android.view.ViewGroup
 import android.widget.TextView
 import androidx.appcompat.app.AlertDialog
+import androidx.appcompat.app.AppCompatActivity
 import androidx.recyclerview.widget.RecyclerView
 import com.google.android.material.datepicker.MaterialDatePicker
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -93,7 +94,7 @@ class SettingsAdapter(
         return getItem(position).type
     }
 
-    fun setSettings(settings: ArrayList<SettingsItem>?) {
+    fun setSettingsList(settings: ArrayList<SettingsItem>?) {
         this.settings = settings
         notifyDataSetChanged()
     }
@@ -144,7 +145,7 @@ class SettingsAdapter(
         calendar.timeZone = TimeZone.getTimeZone("UTC")
 
         var timeFormat: Int = TimeFormat.CLOCK_12H
-        if (DateFormat.is24HourFormat(fragmentView.fragmentActivity)) {
+        if (DateFormat.is24HourFormat(fragmentView.activityView as AppCompatActivity)) {
             timeFormat = TimeFormat.CLOCK_24H
         }
 
@@ -161,7 +162,7 @@ class SettingsAdapter(
 
         datePicker.addOnPositiveButtonClickListener {
             timePicker.show(
-                fragmentView.fragmentActivity.supportFragmentManager,
+                (fragmentView.activityView as AppCompatActivity).supportFragmentManager,
                 "TimePicker"
             )
         }
@@ -177,7 +178,7 @@ class SettingsAdapter(
             item.setSelectedValue(rtcString)
             clickedItem = null
         }
-        datePicker.show(fragmentView.fragmentActivity.supportFragmentManager, "DatePicker")
+        datePicker.show((fragmentView.activityView as AppCompatActivity).supportFragmentManager, "DatePicker")
     }
 
     fun onSliderClick(item: SliderSetting, position: Int) {

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

@@ -12,7 +12,6 @@ import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.updatePadding
 import androidx.fragment.app.Fragment
-import androidx.fragment.app.FragmentActivity
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.google.android.material.divider.MaterialDividerItemDecoration
 import org.yuzu.yuzu_emu.databinding.FragmentSettingsBinding
@@ -21,10 +20,9 @@ import org.yuzu.yuzu_emu.features.settings.model.Settings
 import org.yuzu.yuzu_emu.features.settings.model.view.SettingsItem
 
 class SettingsFragment : Fragment(), SettingsFragmentView {
-    override lateinit var fragmentActivity: FragmentActivity
+    override var activityView: SettingsActivityView? = null
 
-    private val presenter = SettingsFragmentPresenter(this)
+    private val fragmentPresenter = SettingsFragmentPresenter(this)
-    private var activityView: SettingsActivityView? = null
     private var settingsAdapter: SettingsAdapter? = null
 
     private var _binding: FragmentSettingsBinding? = null
@@ -32,15 +30,14 @@ class SettingsFragment : Fragment(), SettingsFragmentView {
 
     override fun onAttach(context: Context) {
         super.onAttach(context)
-        activityView = context as SettingsActivityView
+        activityView = requireActivity() as SettingsActivityView
-        fragmentActivity = requireActivity()
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         val menuTag = requireArguments().getString(ARGUMENT_MENU_TAG)
         val gameId = requireArguments().getString(ARGUMENT_GAME_ID)
-        presenter.onCreate(menuTag!!, gameId!!)
+        fragmentPresenter.onCreate(menuTag!!, gameId!!)
     }
 
     override fun onCreateView(
@@ -61,8 +58,7 @@ class SettingsFragment : Fragment(), SettingsFragmentView {
             layoutManager = LinearLayoutManager(activity)
             addItemDecoration(dividerDecoration)
         }
-        val activity = activity as SettingsActivityView?
+        fragmentPresenter.onViewCreated()
-        presenter.onViewCreated(activity!!.settings)
 
         setInsets()
     }
@@ -75,16 +71,12 @@ class SettingsFragment : Fragment(), SettingsFragmentView {
         }
     }
 
-    override fun onSettingsFileLoaded(settings: Settings) {
-        presenter.setSettings(settings)
-    }
-
     override fun showSettingsList(settingsList: ArrayList<SettingsItem>) {
-        settingsAdapter!!.setSettings(settingsList)
+        settingsAdapter!!.setSettingsList(settingsList)
     }
 
-    override fun loadDefaultSettings() {
+    override fun loadSettingsList() {
-        presenter.loadDefaultSettings()
+        fragmentPresenter.loadSettingsList()
     }
 
     override fun loadSubMenu(menuKey: String) {
@@ -100,7 +92,7 @@ class SettingsFragment : Fragment(), SettingsFragmentView {
     }
 
     override fun putSetting(setting: Setting) {
-        presenter.putSetting(setting)
+        fragmentPresenter.putSetting(setting)
     }
 
     override fun onSettingChanged() {

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

@@ -4,58 +4,37 @@
 package org.yuzu.yuzu_emu.features.settings.ui
 
 import android.text.TextUtils
+import androidx.appcompat.app.AppCompatActivity
 import org.yuzu.yuzu_emu.R
 import org.yuzu.yuzu_emu.features.settings.model.Setting
 import org.yuzu.yuzu_emu.features.settings.model.Settings
-import org.yuzu.yuzu_emu.features.settings.model.StringSetting
 import org.yuzu.yuzu_emu.features.settings.model.view.*
 import org.yuzu.yuzu_emu.features.settings.utils.SettingsFile
 
 class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView) {
     private var menuTag: String? = null
     private lateinit var gameId: String
-    private var settings: Settings? = null
     private var settingsList: ArrayList<SettingsItem>? = null
 
+    private val settingsActivity get() = fragmentView.activityView as AppCompatActivity
+    private val settings get() = fragmentView.activityView!!.settings
+
     fun onCreate(menuTag: String, gameId: String) {
         this.gameId = gameId
         this.menuTag = menuTag
     }
 
-    fun onViewCreated(settings: Settings) {
+    fun onViewCreated() {
-        setSettings(settings)
-    }
-
-    fun putSetting(setting: Setting) {
-        settings!!.getSection(setting.section)!!.putSetting(setting)
-    }
-
-    private fun asStringSetting(setting: Setting?): StringSetting? {
-        if (setting == null) {
-            return null
-        }
-        val stringSetting = StringSetting(setting.key, setting.section, setting.valueAsString)
-        putSetting(stringSetting)
-        return stringSetting
-    }
-
-    fun loadDefaultSettings() {
         loadSettingsList()
     }
 
-    fun setSettings(settings: Settings) {
+    fun putSetting(setting: Setting) {
-        if (settingsList == null) {
+        settings.getSection(setting.section)!!.putSetting(setting)
-            this.settings = settings
-            loadSettingsList()
-        } else {
-            fragmentView.fragmentActivity.setTitle(R.string.preferences_settings)
-            fragmentView.showSettingsList(settingsList!!)
-        }
     }
 
-    private fun loadSettingsList() {
+    fun loadSettingsList() {
         if (!TextUtils.isEmpty(gameId)) {
-            fragmentView.fragmentActivity.title = "Game Settings: $gameId"
+            settingsActivity.title = "Game Settings: $gameId"
         }
         val sl = ArrayList<SettingsItem>()
         if (menuTag == null) {
@@ -77,7 +56,7 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
     }
 
     private fun addConfigSettings(sl: ArrayList<SettingsItem>) {
-        fragmentView.fragmentActivity.setTitle(R.string.preferences_settings)
+        settingsActivity.setTitle(R.string.preferences_settings)
         sl.apply {
             add(
                 SubmenuSetting(
@@ -119,12 +98,12 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
     }
 
     private fun addGeneralSettings(sl: ArrayList<SettingsItem>) {
-        fragmentView.fragmentActivity.setTitle(R.string.preferences_general)
+        settingsActivity.setTitle(R.string.preferences_general)
-        val rendererSection = settings!!.getSection(Settings.SECTION_RENDERER)
+        val rendererSection = settings.getSection(Settings.SECTION_RENDERER)
         val frameLimitEnable =
             rendererSection!!.getSetting(SettingsFile.KEY_RENDERER_USE_SPEED_LIMIT)
         val frameLimitValue = rendererSection.getSetting(SettingsFile.KEY_RENDERER_SPEED_LIMIT)
-        val cpuSection = settings!!.getSection(Settings.SECTION_CPU)
+        val cpuSection = settings.getSection(Settings.SECTION_CPU)
         val cpuAccuracy = cpuSection!!.getSetting(SettingsFile.KEY_CPU_ACCURACY)
         sl.apply {
             add(
@@ -166,8 +145,8 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
     }
 
     private fun addSystemSettings(sl: ArrayList<SettingsItem>) {
-        fragmentView.fragmentActivity.setTitle(R.string.preferences_system)
+        settingsActivity.setTitle(R.string.preferences_system)
-        val systemSection = settings!!.getSection(Settings.SECTION_SYSTEM)
+        val systemSection = settings.getSection(Settings.SECTION_SYSTEM)
         val dockedMode = systemSection!!.getSetting(SettingsFile.KEY_USE_DOCKED_MODE)
         val region = systemSection.getSetting(SettingsFile.KEY_REGION_INDEX)
         val language = systemSection.getSetting(SettingsFile.KEY_LANGUAGE_INDEX)
@@ -210,8 +189,8 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
     }
 
     private fun addGraphicsSettings(sl: ArrayList<SettingsItem>) {
-        fragmentView.fragmentActivity.setTitle(R.string.preferences_graphics)
+        settingsActivity.setTitle(R.string.preferences_graphics)
-        val rendererSection = settings!!.getSection(Settings.SECTION_RENDERER)
+        val rendererSection = settings.getSection(Settings.SECTION_RENDERER)
         val rendererBackend = rendererSection!!.getSetting(SettingsFile.KEY_RENDERER_BACKEND)
         val rendererAccuracy = rendererSection.getSetting(SettingsFile.KEY_RENDERER_ACCURACY)
         val rendererResolution = rendererSection.getSetting(SettingsFile.KEY_RENDERER_RESOLUTION)
@@ -305,8 +284,8 @@ class SettingsFragmentPresenter(private val fragmentView: SettingsFragmentView)
     }
 
     private fun addAudioSettings(sl: ArrayList<SettingsItem>) {
-        fragmentView.fragmentActivity.setTitle(R.string.preferences_audio)
+        settingsActivity.setTitle(R.string.preferences_audio)
-        val audioSection = settings!!.getSection(Settings.SECTION_AUDIO)
+        val audioSection = settings.getSection(Settings.SECTION_AUDIO)
         val audioVolume = audioSection!!.getSetting(SettingsFile.KEY_AUDIO_VOLUME)
         sl.add(
             SliderSetting(

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

@@ -3,9 +3,7 @@
 
 package org.yuzu.yuzu_emu.features.settings.ui
 
-import androidx.fragment.app.FragmentActivity
 import org.yuzu.yuzu_emu.features.settings.model.Setting
-import org.yuzu.yuzu_emu.features.settings.model.Settings
 import org.yuzu.yuzu_emu.features.settings.model.view.SettingsItem
 
 /**
@@ -13,14 +11,6 @@ import org.yuzu.yuzu_emu.features.settings.model.view.SettingsItem
  * this type of view will each display a layer of the setting hierarchy.
  */
 interface SettingsFragmentView {
-    /**
-     * Called by the containing Activity to notify the Fragment that an
-     * asynchronous load operation completed.
-     *
-     * @param settings The (possibly null) result of the ini load operation.
-     */
-    fun onSettingsFileLoaded(settings: Settings)
-
     /**
      * Pass an ArrayList to the View so that it can be displayed on screen.
      *
@@ -29,15 +19,14 @@ interface SettingsFragmentView {
     fun showSettingsList(settingsList: ArrayList<SettingsItem>)
 
     /**
-     * Called by the containing Activity when an asynchronous load operation fails.
+     * Instructs the Fragment to load the settings screen.
-     * Instructs the Fragment to load the settings screen with defaults selected.
      */
-    fun loadDefaultSettings()
+    fun loadSettingsList()
 
     /**
      * @return The Fragment's containing activity.
      */
-    val fragmentActivity: FragmentActivity
+    val activityView: SettingsActivityView?
 
     /**
      * Tell the Fragment to tell the containing Activity to show a new