Delete messages by swiping and add snackbar for undoing deletion.

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

@@ -5,17 +5,15 @@
 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;
 import com.github.gotify.R;
 import com.github.gotify.Settings;
 import com.github.gotify.Utils;
-import com.github.gotify.client.model.Message;
 import com.github.gotify.messages.provider.MessageWithImage;
 import com.squareup.picasso.Picasso;
 import io.noties.markwon.Markwon;
@@ -25,27 +23,21 @@
 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;
     private List<MessageWithImage> items;
-    private Delete delete;
     private Settings settings;
     private Markwon markwon;
 
     ListMessageAdapter(
-            Context context,
-            Settings settings,
-            Picasso picasso,
-            List<MessageWithImage> items,
-            Delete delete) {
+            Context context, Settings settings, Picasso picasso, List<MessageWithImage> items) {
         super();
         this.content = context;
         this.settings = settings;
         this.picasso = picasso;
         this.items = items;
-        this.delete = delete;
 
         this.markwon =
                 Markwon.builder(context)
@@ -56,34 +48,25 @@ public class ListMessageAdapter extends BaseAdapter {
                         .build();
     }
 
-    void items(List<MessageWithImage> items) {
-        this.items = items;
+    public List<MessageWithImage> getItems() {
+        return items;
     }
 
-    @Override
-    public int getCount() {
-        return items.size();
+    public void setItems(List<MessageWithImage> items) {
+        this.items = items;
     }
 
+    @NonNull
     @Override
-    public MessageWithImage getItem(int position) {
-        return items.get(position);
-    }
+    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(content).inflate(R.layout.message_item, parent, false);
 
-    @Override
-    public long getItemId(int position) {
-        return getItem(position).message.getId();
+        ViewHolder holder = new ViewHolder(view);
+        return holder;
     }
 
     @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);
+    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
         final MessageWithImage message = items.get(position);
         if (Extras.useMarkdown(message.message)) {
             holder.message.setAutoLinkMask(0);
@@ -101,9 +84,17 @@ public View getView(int position, View convertView, ViewGroup parent) {
                 message.message.getDate() != null
                         ? Utils.dateToRelative(message.message.getDate())
                         : "?");
-        holder.delete.setOnClickListener((ignored) -> delete.delete(message.message));
+    }
+
+    @Override
+    public int getItemCount() {
+        return items.size();
+    }
 
-        return view;
+    @Override
+    public long getItemId(int position) {
+        MessageWithImage currentItem = items.get(position);
+        return currentItem.message.getId();
     }
 
     static class ViewHolder extends RecyclerView.ViewHolder {
@@ -119,16 +110,9 @@ static class ViewHolder extends RecyclerView.ViewHolder {
         @BindView(R.id.message_date)
         TextView date;
 
-        @BindView(R.id.message_delete)
-        ImageButton delete;
-
         ViewHolder(final View view) {
             super(view);
             ButterKnife.bind(this, view);
         }
     }
-
-    public interface Delete {
-        void delete(Message message);
-    }
 }