Replace ListView with RecyclerView for the message list.

app/src/main/java/com/github/gotify/messages/ListMessageAdapter.java

@@ -5,10 +5,10 @@ import android.text.util.Linkify;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.BaseAdapter;
 import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.TextView;
+import androidx.annotation.NonNull;
 import androidx.recyclerview.widget.RecyclerView;
 import butterknife.BindView;
 import butterknife.ButterKnife;
@@ -25,7 +25,7 @@ import io.noties.markwon.image.picasso.PicassoImagesPlugin;
 import io.noties.markwon.movement.MovementMethodPlugin;
 import java.util.List;
 
-public class ListMessageAdapter extends BaseAdapter {
+public class ListMessageAdapter extends RecyclerView.Adapter<ListMessageAdapter.ViewHolder> {
 
     private Context content;
     private Picasso picasso;
@@ -60,30 +60,17 @@ public class ListMessageAdapter extends BaseAdapter {
         this.items = items;
     }
 
+    @NonNull
     @Override
-    public int getCount() {
-        return items.size();
-    }
+    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(content).inflate(R.layout.message_item, parent, false);
 
-    @Override
-    public MessageWithImage getItem(int position) {
-        return items.get(position);
-    }
-
-    @Override
-    public long getItemId(int position) {
-        return getItem(position).message.getId();
-    }
-
-    @Override
-    public View getView(int position, View convertView, ViewGroup parent) {
-        final View view;
-        if (convertView == null) {
-            view = LayoutInflater.from(content).inflate(R.layout.message_item, parent, false);
-        } else {
-            view = convertView;
-        }
         ViewHolder holder = new ViewHolder(view);
+        return holder;
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
         final MessageWithImage message = items.get(position);
         if (Extras.useMarkdown(message.message)) {
             holder.message.setAutoLinkMask(0);
@@ -102,8 +89,17 @@ public class ListMessageAdapter extends BaseAdapter {
                         ? Utils.dateToRelative(message.message.getDate())
                         : "?");
         holder.delete.setOnClickListener((ignored) -> delete.delete(message.message));
+    }
 
-        return view;
+    @Override
+    public int getItemCount() {
+        return items.size();
+    }
+
+    @Override
+    public long getItemId(int position) {
+        MessageWithImage currentItem = items.get(position);
+        return currentItem.message.getId();
     }
 
     static class ViewHolder extends RecyclerView.ViewHolder {

app/src/main/java/com/github/gotify/messages/MessagesActivity.java

@@ -12,9 +12,7 @@ import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
-import android.widget.AbsListView;
 import android.widget.ImageButton;
-import android.widget.ListView;
 import android.widget.TextView;
 import android.widget.ViewFlipper;
 import androidx.appcompat.app.ActionBarDrawerToggle;
@@ -23,6 +21,9 @@ import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.view.GravityCompat;
 import androidx.drawerlayout.widget.DrawerLayout;
+import androidx.recyclerview.widget.DividerItemDecoration;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
 import butterknife.BindView;
 import butterknife.ButterKnife;
@@ -66,7 +67,7 @@ import okhttp3.OkHttpClient;
 import static java.util.Collections.emptyList;
 
 public class MessagesActivity extends AppCompatActivity
-        implements NavigationView.OnNavigationItemSelectedListener, AbsListView.OnScrollListener {
+        implements NavigationView.OnNavigationItemSelectedListener {
 
     private BroadcastReceiver receiver =
             new BroadcastReceiver() {
@@ -90,7 +91,7 @@ public class MessagesActivity extends AppCompatActivity
     NavigationView navigationView;
 
     @BindView(R.id.messages_view)
-    ListView messagesView;
+    RecyclerView messagesView;
 
     @BindView(R.id.swipe_refresh)
     SwipeRefreshLayout swipeRefreshLayout;
@@ -137,7 +138,14 @@ public class MessagesActivity extends AppCompatActivity
 
         messages = new MessageFacade(client.createService(MessageApi.class), appsHolder);
 
-        messagesView.setOnScrollListener(this);
+        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
+        DividerItemDecoration dividerItemDecoration =
+                new DividerItemDecoration(
+                        messagesView.getContext(), layoutManager.getOrientation());
+        messagesView.addItemDecoration(dividerItemDecoration);
+        messagesView.setHasFixedSize(true);
+        messagesView.setLayoutManager(layoutManager);
+        messagesView.addOnScrollListener(new MessageListOnScrollListener());
         messagesView.setAdapter(
                 new ListMessageAdapter(this, settings, picasso, emptyList(), this::delete));
 
@@ -341,18 +349,25 @@ public class MessagesActivity extends AppCompatActivity
         picasso.shutdown();
     }
 
-    @Override
-    public void onScrollStateChanged(AbsListView view, int scrollState) {}
+    private class MessageListOnScrollListener extends RecyclerView.OnScrollListener {
+        @Override
+        public void onScrollStateChanged(RecyclerView view, int scrollState) {}
 
-    @Override
-    public void onScroll(
-            AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
-        if (firstVisibleItem + visibleItemCount > totalItemCount - 15
-                && totalItemCount != 0
-                && messages.canLoadMore(appId)) {
-            if (!isLoadMore) {
-                isLoadMore = true;
-                new LoadMore().execute(appId);
+        @Override
+        public void onScrolled(RecyclerView view, int dx, int dy) {
+            LinearLayoutManager linearLayoutManager = (LinearLayoutManager) view.getLayoutManager();
+            if (linearLayoutManager != null) {
+                int lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
+                int totalItemCount = view.getAdapter().getItemCount();
+
+                if (lastVisibleItem > totalItemCount - 15
+                        && totalItemCount != 0
+                        && messages.canLoadMore(appId)) {
+                    if (!isLoadMore) {
+                        isLoadMore = true;
+                        new LoadMore().execute(appId);
+                    }
+                }
             }
         }
     }

app/src/main/res/layout/activity_messages.xml

@@ -30,13 +30,13 @@
                     android:layout_width="match_parent"
                     android:layout_height="match_parent" >
 
-                    <ListView
+                    <androidx.recyclerview.widget.RecyclerView
                         android:id="@+id/messages_view"
                         android:layout_width="match_parent"
                         android:layout_height="match_parent"
                         android:scrollbars="vertical"
                         app:layout_behavior="@string/appbar_scrolling_view_behavior">
-                    </ListView>
+                    </androidx.recyclerview.widget.RecyclerView>
 
                     <androidx.constraintlayout.widget.ConstraintLayout
                         android:id="@+id/no_messages"