MusicAdapter.java

package com.example.android.appmusica;

import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

public class MusicAdapter extends ArrayAdapter<Music> {

    private OnOpenMusicListener listener;

    public MusicAdapter(Activity context, ArrayList<Music> words, @NonNull OnOpenMusicListener listener){
        super(context, 0, words);
        this.listener = listener;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        View listItemView = convertView;
        if(listItemView == null) {
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.activity_list_item, parent, false);
        }

        final Music currentMusic = getItem(position);

        TextView textViewMusica = (TextView) listItemView.findViewById(R.id.text_view_musica);
        TextView textViewArtista = (TextView) listItemView.findViewById(R.id.text_view_artista);


        textViewMusica.setText(currentMusic.getDefaultMusica());
        textViewArtista.setText((currentMusic.getDefaultArtista()));

        listItemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                listener.onClick(currentMusic);
            }
        });

        return listItemView;
    }

    public interface OnOpenMusicListener {
        void onClick(Music music);
    }
}