Migrate LifecycleHelper to Kotlin

src/org/kde/kdeconnect/Helpers/LifecycleHelper.java

@@ -1,43 +0,0 @@
-/*
- * SPDX-FileCopyrightText: 2020 Erik Duisters <e.duisters1@gmail.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
-*/
-
-package org.kde.kdeconnect.Helpers;
-
-import androidx.annotation.NonNull;
-import androidx.lifecycle.DefaultLifecycleObserver;
-import androidx.lifecycle.LifecycleOwner;
-import androidx.lifecycle.ProcessLifecycleOwner;
-
-public class LifecycleHelper {
-
-    private static class LifecycleObserver implements DefaultLifecycleObserver {
-        private boolean inForeground = false;
-
-        @Override
-        public void onStart(@NonNull LifecycleOwner owner) {
-            inForeground = true;
-        }
-
-        @Override
-        public void onStop(@NonNull LifecycleOwner owner) {
-            inForeground = false;
-        }
-
-        boolean isInForeground() {
-            return inForeground;
-        }
-    }
-
-    private final static LifecycleObserver foregroundTracker = new LifecycleObserver();
-
-    public static boolean isInForeground() {
-        return foregroundTracker.isInForeground();
-    }
-
-    public static void initializeObserver() {
-        ProcessLifecycleOwner.get().getLifecycle().addObserver(foregroundTracker);
-    }
-}

src/org/kde/kdeconnect/Helpers/LifecycleHelper.kt

@@ -0,0 +1,33 @@
+/*
+ * SPDX-FileCopyrightText: 2020 Erik Duisters <e.duisters1@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+*/
+package org.kde.kdeconnect.Helpers
+
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.ProcessLifecycleOwner
+
+object LifecycleHelper {
+    fun initializeObserver() {
+        ProcessLifecycleOwner.get().lifecycle.addObserver(foregroundTracker)
+    }
+
+    @JvmStatic
+    val isInForeground: Boolean
+        get() = foregroundTracker.isInForeground
+
+    private val foregroundTracker = object : DefaultLifecycleObserver {
+        var isInForeground: Boolean = false
+            private set
+
+        override fun onStart(owner: LifecycleOwner) {
+            this.isInForeground = true
+        }
+
+        override fun onStop(owner: LifecycleOwner) {
+            this.isInForeground = false
+        }
+    }
+}