1 files changed, 47 insertions, 0 deletions
diff --git a/ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.java b/ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.java
new file mode 100644
index 00000000..602ad37c
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright © 2017-2019 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+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;
+import androidx.appcompat.app.AppCompatDelegate;
+import android.util.Log;
+
+import com.wireguard.android.Application;
+
+import java.lang.reflect.Field;
+
+public abstract class ThemeChangeAwareActivity extends AppCompatActivity implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private static final String TAG = "WireGuard/" + ThemeChangeAwareActivity.class.getSimpleName();
+
+    @Override
+    protected void onCreate(@Nullable final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q)
+            Application.getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
+    }
+
+    @Override
+    protected void onDestroy() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q)
+            Application.getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
+        super.onDestroy();
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences, final String key) {
+        if ("dark_theme".equals(key)) {
+            AppCompatDelegate.setDefaultNightMode(
+                    sharedPreferences.getBoolean(key, false) ?
+                            AppCompatDelegate.MODE_NIGHT_YES :
+                            AppCompatDelegate.MODE_NIGHT_NO);
+        }
+    }
+}