Activity: make dark/night theme follow system on Q

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

app/src/main/java/com/wireguard/android/Application.java

@@ -115,9 +115,13 @@ public class Application extends android.app.Application {
         toolsInstaller = new ToolsInstaller(getApplicationContext());
 
         sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
-        AppCompatDelegate.setDefaultNightMode(
-                sharedPreferences.getBoolean("dark_theme", false) ?
-                        AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO);
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+            AppCompatDelegate.setDefaultNightMode(
+                    sharedPreferences.getBoolean("dark_theme", false) ?
+                            AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO);
+        } else {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
+        }
 
         tunnelManager = new TunnelManager(new FileConfigStore(getApplicationContext()));
         tunnelManager.onCreate();

app/src/main/java/com/wireguard/android/activity/SettingsActivity.java

@@ -6,6 +6,7 @@
 package com.wireguard.android.activity;
 
 import android.content.pm.PackageManager;
+import android.os.Build;
 import android.os.Bundle;
 import androidx.annotation.Nullable;
 import androidx.core.app.ActivityCompat;
@@ -91,13 +92,16 @@ public class SettingsActivity extends ThemeChangeAwareActivity {
         @Override
         public void onCreatePreferences(final Bundle savedInstanceState, final String key) {
             addPreferencesFromResource(R.xml.preferences);
+            final PreferenceScreen screen = getPreferenceScreen();
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
+                screen.removePreference(getPreferenceManager().findPreference("dark_theme"));
+
             final Preference wgQuickOnlyPrefs[] = {
                     getPreferenceManager().findPreference("tools_installer"),
                     getPreferenceManager().findPreference("restore_on_boot")
             };
             for (final Preference pref : wgQuickOnlyPrefs)
                 pref.setVisible(false);
-            final PreferenceScreen screen = getPreferenceScreen();
             Application.getBackendAsync().thenAccept(backend -> {
                 for (final Preference pref : wgQuickOnlyPrefs) {
                     if (backend instanceof WgQuickBackend)

app/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.java

@@ -7,6 +7,7 @@ package com.wireguard.android.activity;
 
 import android.content.SharedPreferences;
 import android.content.res.Resources;
+import android.os.Build;
 import android.os.Bundle;
 import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
@@ -55,12 +56,14 @@ public abstract class ThemeChangeAwareActivity extends AppCompatActivity impleme
     @Override
     protected void onCreate(@Nullable final Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        Application.getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q)
+            Application.getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
     }
 
     @Override
     protected void onDestroy() {
-        Application.getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q)
+            Application.getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
         super.onDestroy();
     }