J.erome :
I followed the official Android tutorialand this tutorial but they are really different and I can't figure out how to create my custom adapter.
I have a RecyclerView where I want to display some musics, so in my custom adapter I did:
public class SongPlayListAdapter extends RecyclerView.Adapter<SongPlayListAdapter.MyViewHolder> {
private ArrayList<String> songList;
private Context context;
private int viewRes;
private Resources res;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public static class MyViewHolder extends RecyclerView.ViewHolder {
/* here it's wrong but I don't know what to do
R.id.title_song_playlist TextView mTitleSongPlaylistTextView;
R.id.group_playlist TextView mGroupSongPlaylistTextView;
R.id.preview_song_playlist ImageView mPreviewSongPlaylistImageView; */
// each data item is just a string in this case
public TextView textView;
public MyViewHolder(TextView v) {
super(v);
textView = v;
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public SongPlayListAdapter(Context context, int viewResourceId,
ArrayList<String> songList) {
this.songList = songList;
this.context = context;
this.viewRes = viewResourceId;
this.res = context.getResources();
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
// create a new view
TextView title_song = (TextView);
MyViewHolder vh = new MyViewHolder(v);
return vh;
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
}
@Override
public int getItemCount() {
return songList.size();
}
}
Problem is I don't know how to populate my RecyclerView neither what should be in the overrided methods. I did it with a normal list and my adapter was like this :
View view = convertView;
if (view == null) {
LayoutInflater layoutInflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(viewRes, parent, false);
}
final String song= songList.get(position);
if (song != null) {
final TextView title = (TextView) view.findViewById(R.id.title_song);
final TextView group = (TextView) view.findViewById(R.id.group_song);
final ImageView image= (ImageView) view.findViewById(R.id.image_song);
title.setText(song);
description.setText(song);
}
return view;
}
So how can I manage to fix my adapter ? I'm really lost and the tutorial isn't really helping
Ravi :
You can use the holder something like this , where in bind data you will set the data for each row item. Can follow the given example below
public class RestaurantListAdapter extends RecyclerView.Adapter<RestaurantListAdapter.RestaurantViewHolder> {
private ArrayList<Restaurant> mRestaurants = new ArrayList<>();
private Context mContext;
public RestaurantListAdapter(Context context, ArrayList<Restaurant> restaurants) {
mContext = context;
mRestaurants = restaurants;
}
public class RestaurantViewHolder extends RecyclerView.ViewHolder {
@Bind(R.id.restaurantImageView) ImageView mRestaurantImageView;
@Bind(R.id.restaurantNameTextView) TextView mNameTextView;
@Bind(R.id.categoryTextView) TextView mCategoryTextView;
@Bind(R.id.ratingTextView) TextView mRatingTextView;
private Context mContext;
public RestaurantViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
mContext = itemView.getContext();
}
public void bindRestaurant(Restaurant restaurant) {
mNameTextView.setText(restaurant.getName());
mCategoryTextView.setText(restaurant.getCategories().get(0));
mRatingTextView.setText("Rating: " + restaurant.getRating() + "/5");
}
}
}
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