ui: no need to manually recreate activities after night change

Since version 1.1.0, setDefaultNightMode now takes care of that. Also,
set the initial mode in a blocking fashion to prevent flashing white.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/Application.kt

@@ -35,6 +35,7 @@ import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.runBlocking
 import java.lang.ref.WeakReference
 import java.util.Locale
 
@@ -92,10 +93,19 @@ class Application : android.app.Application() {
         toolsInstaller = ToolsInstaller(applicationContext, rootShell)
         preferencesDataStore = PreferenceDataStoreFactory.create { applicationContext.preferencesDataStoreFile("settings") }
         if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
-            coroutineScope.launch {
+            runBlocking {
-                AppCompatDelegate.setDefaultNightMode(
+                AppCompatDelegate.setDefaultNightMode(if (UserKnobs.darkTheme.first()) AppCompatDelegate.MODE_NIGHT_YES else AppCompatDelegate.MODE_NIGHT_NO)
-                        if (UserKnobs.darkTheme.first()) AppCompatDelegate.MODE_NIGHT_YES else AppCompatDelegate.MODE_NIGHT_NO)
             }
+            UserKnobs.darkTheme.onEach {
+                val newMode = if (it) {
+                    AppCompatDelegate.MODE_NIGHT_YES
+                } else {
+                    AppCompatDelegate.MODE_NIGHT_NO
+                }
+                if (AppCompatDelegate.getDefaultNightMode() != newMode) {
+                    AppCompatDelegate.setDefaultNightMode(newMode)
+                }
+            }.launchIn(coroutineScope)
         } else {
             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)
         }

ui/src/main/java/com/wireguard/android/activity/BaseActivity.kt

@@ -5,6 +5,7 @@
 package com.wireguard.android.activity
 
 import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
 import androidx.databinding.CallbackRegistry
 import androidx.databinding.CallbackRegistry.NotifierCallback
 import androidx.lifecycle.lifecycleScope
@@ -15,7 +16,7 @@ import kotlinx.coroutines.launch
 /**
  * Base class for activities that need to remember the currently-selected tunnel.
  */
-abstract class BaseActivity : ThemeChangeAwareActivity() {
+abstract class BaseActivity : AppCompatActivity() {
     private val selectionChangeRegistry = SelectionChangeRegistry()
     private var created = false
     var selectedTunnel: ObservableTunnel? = null

ui/src/main/java/com/wireguard/android/activity/SettingsActivity.kt

@@ -8,6 +8,7 @@ import android.content.Intent
 import android.os.Build
 import android.os.Bundle
 import android.view.MenuItem
+import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.commit
 import androidx.lifecycle.lifecycleScope
 import androidx.preference.Preference
@@ -24,7 +25,7 @@ import kotlinx.coroutines.withContext
 /**
  * Interface for changing application-global persistent settings.
  */
-class SettingsActivity : ThemeChangeAwareActivity() {
+class SettingsActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         if (supportFragmentManager.findFragmentById(android.R.id.content) == null) {

ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.kt

@@ -1,33 +0,0 @@
-/*
- * Copyright © 2017-2023 WireGuard LLC. All Rights Reserved.
- * SPDX-License-Identifier: Apache-2.0
- */
-package com.wireguard.android.activity
-
-import android.os.Build
-import android.os.Bundle
-import androidx.appcompat.app.AppCompatActivity
-import androidx.appcompat.app.AppCompatDelegate
-import androidx.lifecycle.lifecycleScope
-import com.wireguard.android.util.UserKnobs
-import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.onEach
-
-abstract class ThemeChangeAwareActivity : AppCompatActivity() {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
-            UserKnobs.darkTheme.onEach {
-                val newMode = if (it) {
-                    AppCompatDelegate.MODE_NIGHT_YES
-                } else {
-                    AppCompatDelegate.MODE_NIGHT_NO
-                }
-                if (AppCompatDelegate.getDefaultNightMode() != newMode) {
-                    AppCompatDelegate.setDefaultNightMode(newMode)
-                    recreate()
-                }
-            }.launchIn(lifecycleScope)
-        }
-    }
-}

ui/src/main/java/com/wireguard/android/activity/TvMainActivity.kt

@@ -21,6 +21,7 @@ import android.view.View
 import android.widget.Toast
 import androidx.activity.addCallback
 import androidx.activity.result.contract.ActivityResultContracts
+import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.content.ContextCompat
 import androidx.core.content.getSystemService
@@ -48,13 +49,14 @@ import com.wireguard.android.util.ErrorMessages
 import com.wireguard.android.util.QuantityFormatter
 import com.wireguard.android.util.TunnelImporter
 import com.wireguard.android.util.UserKnobs
+import com.wireguard.android.util.applicationScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import java.io.File
 
-class TvMainActivity : ThemeChangeAwareActivity() {
+class TvMainActivity : AppCompatActivity() {
     private val tunnelFileImportResultLauncher = registerForActivityResult(object : ActivityResultContracts.GetContent() {
         override fun createIntent(context: Context, input: String): Intent {
             val intent = super.createIntent(context, input)
@@ -112,11 +114,9 @@ class TvMainActivity : ThemeChangeAwareActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         if (AppCompatDelegate.getDefaultNightMode() != AppCompatDelegate.MODE_NIGHT_YES) {
-            /* First set it this way to prevent a white flash. */
             AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
             if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
-                /* Then update the preference, which triggers the recreation. */
+                applicationScope.launch {
-                lifecycleScope.launch {
                     UserKnobs.setDarkTheme(true)
                 }
             }