diff --git a/app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkFragment.java b/app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkFragment.java
deleted file mode 100644
index 9100fb63c..000000000
--- a/app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkFragment.java
+++ /dev/null
@@ -1,105 +0,0 @@
-package fr.free.nrw.commons.bookmarks;
-
-import android.os.Bundle;
-import android.view.LayoutInflater;
-import android.view.View;
-import android.view.ViewGroup;
-
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.fragment.app.FragmentManager;
-import fr.free.nrw.commons.contributions.MainActivity;
-import fr.free.nrw.commons.databinding.FragmentBookmarksBinding;
-import fr.free.nrw.commons.di.CommonsDaggerSupportFragment;
-import fr.free.nrw.commons.kvstore.JsonKvStore;
-import fr.free.nrw.commons.theme.BaseActivity;
-import javax.inject.Inject;
-import fr.free.nrw.commons.contributions.ContributionController;
-import javax.inject.Named;
-
-public class BookmarkFragment extends CommonsDaggerSupportFragment {
-
-    private FragmentManager supportFragmentManager;
-    private BookmarksPagerAdapter adapter;
-    FragmentBookmarksBinding binding;
-
-    @Inject
-    ContributionController controller;
-    /**
-     * To check if the user is loggedIn or not.
-     */
-    @Inject
-    @Named("default_preferences")
-    public
-    JsonKvStore applicationKvStore;
-
-    @NonNull
-    public static BookmarkFragment newInstance() {
-        BookmarkFragment fragment = new BookmarkFragment();
-        fragment.setRetainInstance(true);
-        return fragment;
-    }
-
-    public void setScroll(boolean canScroll) {
-        if (binding!=null) {
-            binding.viewPagerBookmarks.setCanScroll(canScroll);
-        }
-    }
-
-    @Override
-    public void onCreate(@Nullable final Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-    }
-
-    @Nullable
-    @Override
-    public View onCreateView(@NonNull final LayoutInflater inflater,
-        @Nullable final ViewGroup container,
-        @Nullable final Bundle savedInstanceState) {
-        super.onCreateView(inflater, container, savedInstanceState);
-        binding = FragmentBookmarksBinding.inflate(inflater, container, false);
-
-        // Activity can call methods in the fragment by acquiring a
-        // reference to the Fragment from FragmentManager, using findFragmentById()
-        supportFragmentManager = getChildFragmentManager();
-
-        adapter = new BookmarksPagerAdapter(supportFragmentManager, getContext(),
-            applicationKvStore.getBoolean("login_skipped"));
-        binding.viewPagerBookmarks.setAdapter(adapter);
-        binding.tabLayout.setupWithViewPager(binding.viewPagerBookmarks);
-
-        ((MainActivity) getActivity()).showTabs();
-        ((BaseActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(false);
-
-        setupTabLayout();
-        return binding.getRoot();
-    }
-
-    /**
-     * This method sets up the tab layout. If the adapter has only one element it sets the
-     * visibility of tabLayout to gone.
-     */
-    public void setupTabLayout() {
-        binding.tabLayout.setVisibility(View.VISIBLE);
-        if (adapter.getCount() == 1) {
-            binding.tabLayout.setVisibility(View.GONE);
-        }
-    }
-
-
-    public void onBackPressed() {
-        if (((BookmarkListRootFragment) (adapter.getItem(binding.tabLayout.getSelectedTabPosition())))
-            .backPressed()) {
-            // The event is handled internally by the adapter , no further action required.
-            return;
-        }
-        // Event is not handled by the adapter ( performed back action ) change action bar.
-        ((BaseActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(false);
-    }
-
-    @Override
-    public void onDestroy() {
-        super.onDestroy();
-        binding = null;
-    }
-}
diff --git a/app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkFragment.kt b/app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkFragment.kt
new file mode 100644
index 000000000..48db40ad0
--- /dev/null
+++ b/app/src/main/java/fr/free/nrw/commons/bookmarks/BookmarkFragment.kt
@@ -0,0 +1,98 @@
+package fr.free.nrw.commons.bookmarks
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import fr.free.nrw.commons.contributions.ContributionController
+import fr.free.nrw.commons.contributions.MainActivity
+import fr.free.nrw.commons.databinding.FragmentBookmarksBinding
+import fr.free.nrw.commons.di.CommonsDaggerSupportFragment
+import fr.free.nrw.commons.kvstore.JsonKvStore
+import fr.free.nrw.commons.theme.BaseActivity
+import javax.inject.Inject
+import javax.inject.Named
+
+class BookmarkFragment : CommonsDaggerSupportFragment() {
+    private var adapter: BookmarksPagerAdapter? = null
+
+    @JvmField
+    var binding: FragmentBookmarksBinding? = null
+
+    @JvmField
+    @Inject
+    var controller: ContributionController? = null
+
+    /**
+     * To check if the user is loggedIn or not.
+     */
+    @JvmField
+    @Inject
+    @Named("default_preferences")
+    var applicationKvStore: JsonKvStore? = null
+
+    fun setScroll(canScroll: Boolean) {
+        binding?.let {
+            it.viewPagerBookmarks.isCanScroll = canScroll
+        }
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        super.onCreateView(inflater, container, savedInstanceState)
+        binding = FragmentBookmarksBinding.inflate(inflater, container, false)
+
+        // Activity can call methods in the fragment by acquiring a
+        // reference to the Fragment from FragmentManager, using findFragmentById()
+        val supportFragmentManager = childFragmentManager
+
+        adapter = BookmarksPagerAdapter(
+            supportFragmentManager, requireContext(),
+            applicationKvStore!!.getBoolean("login_skipped")
+        )
+        binding!!.viewPagerBookmarks.adapter = adapter
+        binding!!.tabLayout.setupWithViewPager(binding!!.viewPagerBookmarks)
+
+        (requireActivity() as MainActivity).showTabs()
+        (requireActivity() as BaseActivity).supportActionBar!!.setDisplayHomeAsUpEnabled(false)
+
+        setupTabLayout()
+        return binding!!.root
+    }
+
+    /**
+     * This method sets up the tab layout. If the adapter has only one element it sets the
+     * visibility of tabLayout to gone.
+     */
+    fun setupTabLayout() {
+        binding!!.tabLayout.visibility = View.VISIBLE
+        if (adapter!!.count == 1) {
+            binding!!.tabLayout.visibility = View.GONE
+        }
+    }
+
+
+    fun onBackPressed() {
+        if (((adapter!!.getItem(binding!!.tabLayout.selectedTabPosition)) as BookmarkListRootFragment).backPressed()) {
+            // The event is handled internally by the adapter , no further action required.
+            return
+        }
+
+        // Event is not handled by the adapter ( performed back action ) change action bar.
+        (requireActivity() as BaseActivity).supportActionBar!!.setDisplayHomeAsUpEnabled(false)
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        binding = null
+    }
+
+    companion object {
+        fun newInstance(): BookmarkFragment = BookmarkFragment().apply {
+            retainInstance = true
+        }
+    }
+}