Setup standard answers, fixes, improvements

app/src/main/java/eu/faircode/email/AdapterAnswer.java

@@ -0,0 +1,168 @@
+package eu.faircode.email;
+
+/*
+    This file is part of FairEmail.
+
+    FairEmail is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    NetGuard is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+import android.util.Log;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import java.text.Collator;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Locale;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.ListUpdateCallback;
+import androidx.recyclerview.widget.RecyclerView;
+
+public class AdapterAnswer extends RecyclerView.Adapter<AdapterAnswer.ViewHolder> {
+    private Context context;
+
+    private List<EntityAnswer> all = new ArrayList<>();
+    private List<EntityAnswer> filtered = new ArrayList<>();
+
+    public class ViewHolder extends RecyclerView.ViewHolder {
+        View itemView;
+        TextView tvName;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+
+            this.itemView = itemView;
+            tvName = itemView.findViewById(R.id.tvName);
+        }
+
+        private void bindTo(EntityAnswer answer) {
+            tvName.setText(answer.name);
+        }
+    }
+
+    AdapterAnswer(Context context) {
+        this.context = context;
+        setHasStableIds(true);
+    }
+
+    public void set(@NonNull List<EntityAnswer> answers) {
+        Log.i(Helper.TAG, "Set answers=" + answers.size());
+
+        final Collator collator = Collator.getInstance(Locale.getDefault());
+        collator.setStrength(Collator.SECONDARY); // Case insensitive, process accents etc
+
+        Collections.sort(answers, new Comparator<EntityAnswer>() {
+            @Override
+            public int compare(EntityAnswer a1, EntityAnswer a2) {
+                return collator.compare(a1.name, a2.name);
+            }
+        });
+
+        all.clear();
+        all.addAll(answers);
+
+        DiffUtil.DiffResult diff = DiffUtil.calculateDiff(new MessageDiffCallback(filtered, all));
+
+        filtered.clear();
+        filtered.addAll(all);
+
+        diff.dispatchUpdatesTo(new ListUpdateCallback() {
+            @Override
+            public void onInserted(int position, int count) {
+                Log.i(Helper.TAG, "Inserted @" + position + " #" + count);
+            }
+
+            @Override
+            public void onRemoved(int position, int count) {
+                Log.i(Helper.TAG, "Removed @" + position + " #" + count);
+            }
+
+            @Override
+            public void onMoved(int fromPosition, int toPosition) {
+                Log.i(Helper.TAG, "Moved " + fromPosition + ">" + toPosition);
+            }
+
+            @Override
+            public void onChanged(int position, int count, Object payload) {
+                Log.i(Helper.TAG, "Changed @" + position + " #" + count);
+            }
+        });
+        diff.dispatchUpdatesTo(this);
+    }
+
+    private class MessageDiffCallback extends DiffUtil.Callback {
+        private List<EntityAnswer> prev;
+        private List<EntityAnswer> next;
+
+        MessageDiffCallback(List<EntityAnswer> prev, List<EntityAnswer> next) {
+            this.prev = prev;
+            this.next = next;
+        }
+
+        @Override
+        public int getOldListSize() {
+            return prev.size();
+        }
+
+        @Override
+        public int getNewListSize() {
+            return next.size();
+        }
+
+        @Override
+        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+            EntityAnswer a1 = prev.get(oldItemPosition);
+            EntityAnswer a2 = next.get(newItemPosition);
+            return a1.id.equals(a2.id);
+        }
+
+        @Override
+        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+            EntityAnswer a1 = prev.get(oldItemPosition);
+            EntityAnswer a2 = next.get(newItemPosition);
+            return a1.equals(a2);
+        }
+    }
+
+    @Override
+    public long getItemId(int position) {
+        return filtered.get(position).id;
+    }
+
+    @Override
+    public int getItemCount() {
+        return filtered.size();
+    }
+
+    @Override
+    @NonNull
+    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        return new ViewHolder(LayoutInflater.from(context).inflate(R.layout.item_folder, parent, false));
+    }
+
+    @Override
+    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
+        EntityAnswer answer = filtered.get(position);
+        holder.bindTo(answer);
+    }
+}