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Use ListAdapter and DiffUtil in RoomActivity notes #102

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Merged
MihaiCristianCondrea merged 1 commit into from
Sep 3, 2025
Merged

Use ListAdapter and DiffUtil in RoomActivity notes #102

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34 changes: 20 additions & 14 deletions ...ava/com/d4rk/androidtutorials/java/ui/screens/android/lessons/data/room/RoomActivity.java
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,9 @@
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.DiffUtil;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.ListAdapter;
import androidx.recyclerview.widget.RecyclerView;

import com.d4rk.androidtutorials.java.R;
Expand All @@ -18,7 +20,6 @@
import com.d4rk.androidtutorials.java.utils.EdgeToEdgeDelegate;
import com.google.android.material.textview.MaterialTextView;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
Expand Down Expand Up @@ -74,7 +75,7 @@ private void loadNotes() {
if (!executor.isShutdown()) {
executor.execute(() -> {
List<Note> notes = db.noteDao().getAll();
runOnUiThread(() -> adapter.setNotes(notes));
runOnUiThread(() -> adapter.submitList(notes));
});
}
}
Expand All @@ -86,14 +87,24 @@ protected void onDestroy() {
handler.removeCallbacksAndMessages(null);
}

private static class NotesAdapter extends RecyclerView.Adapter<NotesAdapter.NoteViewHolder> {
private List<Note> notes = new ArrayList<>();

void setNotes(List<Note> notes) {
this.notes = notes;
notifyDataSetChanged();
private static class NotesAdapter extends ListAdapter<Note, NotesAdapter.NoteViewHolder> {
NotesAdapter() {
super(DIFF_CALLBACK);
}

private static final DiffUtil.ItemCallback<Note> DIFF_CALLBACK =
new DiffUtil.ItemCallback<Note>() {
@Override
public boolean areItemsTheSame(@NonNull Note oldItem, @NonNull Note newItem) {
return oldItem.id == newItem.id;
}

@Override
public boolean areContentsTheSame(@NonNull Note oldItem, @NonNull Note newItem) {
return oldItem.text.equals(newItem.text);
}
};

@NonNull
@Override
public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
Expand All @@ -104,12 +115,7 @@ public NoteViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType

@Override
public void onBindViewHolder(@NonNull NoteViewHolder holder, int position) {
holder.textView.setText(notes.get(position).getText());
}

@Override
public int getItemCount() {
return notes.size();
holder.textView.setText(getItem(position).getText());
}

static class NoteViewHolder extends RecyclerView.ViewHolder {
Expand Down