Support follow system theme[Android 10] (#2603)

* Support follow system theme

* Show [follow system theme] only on Oreo and newer

* Update preference values of theme

* Refine theme preference

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceKeys.kt

@@ -5,7 +5,9 @@ package eu.kanade.tachiyomi.data.preference
  */
 object PreferenceKeys {
 
-    const val theme = "pref_theme_key"
+    const val themeMode = "pref_theme_mode_key"
+
+    const val themeDark = "pref_theme_dark_key"
 
     const val rotation = "pref_rotation_type_key"
 

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferenceValues.kt

@@ -0,0 +1,19 @@
+package eu.kanade.tachiyomi.data.preference
+
+/**
+ * This class stores the values for the preferences in the application.
+ */
+object PreferenceValues {
+
+    const val THEME_MODE_LIGHT = "light"
+
+    const val THEME_MODE_DARK = "dark"
+
+    const val THEME_MODE_SYSTEM = "system"
+
+    const val THEME_DARK_DEFAULT = "default"
+
+    const val THEME_DARK_AMOLED = "amoled"
+
+    const val THEME_DARK_BLUE = "blue"
+}

app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt

@@ -15,6 +15,7 @@ import java.text.DateFormat
 import java.text.SimpleDateFormat
 import java.util.Locale
 import eu.kanade.tachiyomi.data.preference.PreferenceKeys as Keys
+import eu.kanade.tachiyomi.data.preference.PreferenceValues as Values
 
 fun <T> Preference<T>.getOrDefault(): T = get() ?: defaultValue()!!
 
@@ -53,7 +54,9 @@ class PreferencesHelper(val context: Context) {
 
     fun clear() = prefs.edit().clear().apply()
 
-    fun theme() = prefs.getInt(Keys.theme, 1)
+    fun themeMode() = prefs.getString(Keys.themeMode, Values.THEME_MODE_LIGHT)
+
+    fun themeDark() = prefs.getString(Keys.themeDark, Values.THEME_DARK_DEFAULT)
 
     fun rotation() = rxPrefs.getInteger(Keys.rotation, 1)
 

app/src/main/java/eu/kanade/tachiyomi/ui/base/activity/BaseActivity.kt

@@ -1,27 +1,44 @@
 package eu.kanade.tachiyomi.ui.base.activity
 
+import android.app.UiModeManager
+import android.content.Context
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.util.system.LocaleHelper
 import uy.kohesive.injekt.injectLazy
+import eu.kanade.tachiyomi.data.preference.PreferenceValues as Values
 
 abstract class BaseActivity : AppCompatActivity() {
 
     val preferences: PreferencesHelper by injectLazy()
 
+    private val darkTheme: Int
+        get() = when (preferences.themeDark()) {
+            Values.THEME_DARK_DEFAULT -> R.style.Theme_Tachiyomi_Dark
+            Values.THEME_DARK_AMOLED -> R.style.Theme_Tachiyomi_Amoled
+            else -> R.style.Theme_Tachiyomi_DarkBlue
+        }
+
     init {
         @Suppress("LeakingThis")
         LocaleHelper.updateConfiguration(this)
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        setTheme(when (preferences.theme()) {
-            2 -> R.style.Theme_Tachiyomi_Dark
-            3 -> R.style.Theme_Tachiyomi_Amoled
-            4 -> R.style.Theme_Tachiyomi_DarkBlue
-            else -> R.style.Theme_Tachiyomi
+        setTheme(when (preferences.themeMode()) {
+            Values.THEME_MODE_LIGHT -> R.style.Theme_Tachiyomi
+            Values.THEME_MODE_DARK -> darkTheme
+            else -> {
+                val mode = getSystemService(Context.UI_MODE_SERVICE) as UiModeManager
+                if (mode.nightMode == AppCompatDelegate.MODE_NIGHT_YES) {
+                    darkTheme
+                } else {
+                    R.style.Theme_Tachiyomi
+                }
+            }
         })
         super.onCreate(savedInstanceState)
     }

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsGeneralController.kt

@@ -1,10 +1,12 @@
 package eu.kanade.tachiyomi.ui.setting
 
+import android.os.Build
 import androidx.preference.PreferenceScreen
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.util.preference.*
 import eu.kanade.tachiyomi.util.system.LocaleHelper
 import eu.kanade.tachiyomi.data.preference.PreferenceKeys as Keys
+import eu.kanade.tachiyomi.data.preference.PreferenceValues as Values
 
 class SettingsGeneralController : SettingsController() {
 
@@ -48,13 +50,27 @@ class SettingsGeneralController : SettingsController() {
             defaultValue = ""
             summary = "%s"
         }
-        intListPreference {
-            key = Keys.theme
-            titleRes = R.string.pref_theme
-            entriesRes = arrayOf(R.string.light_theme, R.string.dark_theme,
-                    R.string.amoled_theme, R.string.darkblue_theme)
-            entryValues = arrayOf("1", "2", "3", "4")
-            defaultValue = "1"
+        listPreference {
+            key = Keys.themeMode
+            titleRes = R.string.pref_theme_mode
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                entriesRes = arrayOf(
+                        R.string.theme_light,
+                        R.string.theme_dark,
+                        R.string.theme_system)
+                entryValues = arrayOf(
+                        Values.THEME_MODE_LIGHT,
+                        Values.THEME_MODE_DARK,
+                        Values.THEME_MODE_SYSTEM)
+            } else {
+                entriesRes = arrayOf(
+                        R.string.theme_light,
+                        R.string.theme_dark)
+                entryValues = arrayOf(
+                        Values.THEME_MODE_LIGHT,
+                        Values.THEME_MODE_DARK)
+            }
+            defaultValue = Values.THEME_MODE_LIGHT
             summary = "%s"
 
             onChange {
@@ -62,6 +78,27 @@ class SettingsGeneralController : SettingsController() {
                 true
             }
         }
+        listPreference {
+            key = Keys.themeDark
+            titleRes = R.string.pref_theme_dark
+            entriesRes = arrayOf(
+                    R.string.theme_dark_default,
+                    R.string.theme_dark_amoled,
+                    R.string.theme_dark_blue)
+            entryValues = arrayOf(
+                    Values.THEME_DARK_DEFAULT,
+                    Values.THEME_DARK_AMOLED,
+                    Values.THEME_DARK_BLUE)
+            defaultValue = Values.THEME_DARK_DEFAULT
+            summary = "%s"
+
+            onChange {
+                if (preferences.themeMode() != Values.THEME_MODE_LIGHT) {
+                    activity?.recreate()
+                }
+                true
+            }
+        }
         intListPreference {
             key = Keys.startScreen
             titleRes = R.string.pref_start_screen

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

@@ -118,11 +118,14 @@
     <string name="pref_category_about">About</string>
 
       <!-- General section -->
-    <string name="pref_theme">App theme</string>
-    <string name="light_theme">Light</string>
-    <string name="dark_theme">Dark</string>
-    <string name="amoled_theme">AMOLED dark</string>
-    <string name="darkblue_theme">Dark blue</string>
+    <string name="pref_theme_mode">App theme</string>
+    <string name="theme_light">Light</string>
+    <string name="theme_dark">Dark</string>
+    <string name="theme_system">Follow system</string>
+    <string name="pref_theme_dark">Dark theme</string>
+    <string name="theme_dark_default">Default</string>
+    <string name="theme_dark_amoled">AMOLED</string>
+    <string name="theme_dark_blue">Dark blue</string>
     <string name="pref_start_screen">Start screen</string>
     <string name="pref_language">Language</string>
     <string name="system_default">System default</string>