send Arraylist by Intent

I hope this helps you.

1. Your Song class should be implements Parcelable Class

public class Song implements Parcelable { 
//Your setter and getter methods
}

2. Put your arraylist to putParcelableArrayListExtra()

public class ActivityA extends AppCompatActivity {
ArrayList<Song> songs;

@Override
protected void onCreate(Bundle savedInstanceState) {
button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(getApplicationContext(), ActivityB.class)
            .putParcelableArrayListExtra("songs", (ArrayList<? extends Parcelable>) songs));
        }
    });
}

3. In the ActivityB

public class ActivityB extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    Intent intent = getIntent();
    final ArrayList<Song> songs = intent.getParcelableArrayListExtra("songs");

    //Check the value in the console
    buttonCheck.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            for (Song value : songs) {
                System.out.println(value.getTitle());
            }
        }
    });
}

to send a string arrayList in Java you can use,

intent.putStringArrayListExtra("key", skillist <- your arraylist);

and

 List<String> listName = getIntent().getStringArrayListExtra("key");