How to send data of the list item of a custom arraylist when clicked to another activity?

Question

I have an array list of custom Song objects and I want to send the song name, artist name and the album cover image to another activity (Song Activity) when a particular song item of the listview is clicked. I have created a SongActivity for showing the now playing screen for the song that the user has selected.

(SONGS LIST ACTIVITY) This contains the songs list.

 public class SongsListActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.songs_list);
    ArrayList<Song> songs = new ArrayList<Song>();
            songs.add(new Song("Earthquake","Marshmello and TYNAN",R.mipmap.earthquake));
        .....

            final SongAdapter adapter = new SongAdapter(this, songs);


            ListView listView = findViewById(R.id.list);

            listView.setAdapter(adapter);

            ListView listview = (ListView) findViewById(R.id.list);
            listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                    Intent intent = new Intent(view.getContext(), SongActivity.class);

                }
            });

        }
    }

(SONG ACTIVITY) This activity starts when a particular song object is clicked by the user

import androidx.appcompat.app.AppCompatActivity;

public class SongActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.song_activity);
        ImageView songImage = findViewById(R.id.songImage);
        TextView songName = findViewById(R.id.songName);
        TextView artistName = findViewById(R.id.artistName);

        Intent intent = getIntent();

        songImage.setImageResource(intent.getIntExtra("image",0));
        songName.setText(intent.getStringExtra("songName"));
        artistName.setText(intent.getStringExtra("artistName"));

    }
}

(SONG ADAPTER)

public class SongAdapter extends ArrayAdapter {

    public SongAdapter(Activity context, ArrayList<Song> songs) {

        super(context, 0, songs);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Check if the existing view is being reused, otherwise inflate the view
        View listItemView = convertView;
        if(listItemView == null) {
            listItemView = LayoutInflater.from(getContext()).inflate(
                    R.layout.list_item, parent, false);
        }


        Song currentSong = (Song) getItem(position);

        TextView nameTextView = (TextView) listItemView.findViewById(R.id.song_name);

        nameTextView.setText(currentSong.getSongName());

        TextView artistTextView = (TextView) listItemView.findViewById(R.id.artist_name);

        artistTextView.setText(currentSong.getArtistName());

        ImageView iconView = (ImageView) listItemView.findViewById(R.id.song_icon);

        iconView.setImageResource(currentSong.getImageResourceId());

        return listItemView;
    }

}

Answer 1

Your Song Model(Class) Should look like this

    import android.os.Parcel;
    import android.os.Parcelable;

    public final class Songs implements Parcelable {
        public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {
            @Override
            public Songs createFromParcel(final Parcel source) {
                return new Songs(source);
            }

            @Override
            public Songs[] newArray(final int size) {
                return new Songs[size];
            }
        };
        private String songName;
        private String artistName;
        private Integer imageId;

        public Songs() {
        }

        public Songs(final String songName, final String artistName, final Integer imageId) {
            this.songName = songName;
            this.artistName = artistName;
            this.imageId = imageId;
        }

        protected Songs(final Parcel in) {
            this.songName = in.readString();
            this.artistName = in.readString();
            this.imageId = (Integer) in.readValue(Integer.class.getClassLoader());
        }

        public String getSongName() {
            return songName;
        }

        public void setSongName(final String songName) {
            this.songName = songName;
        }

        public String getArtistName() {
            return artistName;
        }

        public void setArtistName(final String artistName) {
            this.artistName = artistName;
        }

        public Integer getImageId() {
            return imageId;
        }

        public void setImageId(final Integer imageId) {
            this.imageId = imageId;
        }

        @Override
        public int describeContents() {
            return 0;
        }

        @Override
        public void writeToParcel(final Parcel dest, final int flags) {
            dest.writeString(this.songName);
            dest.writeString(this.artistName);
            dest.writeValue(this.imageId);
        }
    }

In your SongListActivity

    listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                public void onItemClick(AdapterView parent, View view, int position, long id) {

                    Intent intent = new Intent(view.getContext(), SongActivity.class);
                    intent.putExtra("SONG_DATA", songList.get(position));
                    startActivity(intent);
                }
            });

And at last in onCreate() of your SongActivity you have to get the intent and get the data like

if (getIntent() != null) {
    Song song = getIntent().getParcelableExtra("SONG_DATA");
    // now you have got song object, You can do rest of operations
}