Convert activity package to Kotlin

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

1 files changed, 42 insertions, 0 deletions

diff --git a/ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.kt b/ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.kt
new file mode 100644
index 00000000..bd124cbc
--- /dev/null
+++ b/ui/src/main/java/com/wireguard/android/activity/ThemeChangeAwareActivity.kt
@@ -0,0 +1,42 @@
+/*
+ * 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.SharedPreferences.OnSharedPreferenceChangeListener
+import android.os.Build
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.app.AppCompatDelegate
+import com.wireguard.android.Application
+
+abstract class ThemeChangeAwareActivity : AppCompatActivity(), OnSharedPreferenceChangeListener {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+            Application.getSharedPreferences().registerOnSharedPreferenceChangeListener(this)
+        }
+    }
+
+    override fun onDestroy() {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.Q) {
+            Application.getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this)
+        }
+        super.onDestroy()
+    }
+
+    override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {
+        when (key) {
+            "dark_theme" -> {
+                AppCompatDelegate.setDefaultNightMode(if (sharedPreferences.getBoolean(key, false)) {
+                    AppCompatDelegate.MODE_NIGHT_YES
+                } else {
+                    AppCompatDelegate.MODE_NIGHT_NO
+                })
+                recreate()
+            }
+        }
+    }
+}