要在RecyclerView中点击项目后实现Parcelable ArrayList，可以按照以下步骤进行操作：

1. 创建一个包含Parcelable ArrayList的数据模型类。例如，假设我们有一个Student类，其中包含一个名字和年龄的ArrayList。

public class Student implements Parcelable {
    private String name;
    private int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    protected Student(Parcel in) {
        name = in.readString();
        age = in.readInt();
    }

    public static final Creator CREATOR = new Creator() {
        @Override
        public Student createFromParcel(Parcel in) {
            return new Student(in);
        }

        @Override
        public Student[] newArray(int size) {
            return new Student[size];
        }
    };

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeInt(age);
    }
}

2. 在RecyclerView的适配器中，将点击事件添加到项目的ViewHolder中。

public class StudentAdapter extends RecyclerView.Adapter {
    private List studentList;
    private OnItemClickListener listener;

    public interface OnItemClickListener {
        void onItemClick(Student student);
    }

    public StudentAdapter(List studentList, OnItemClickListener listener) {
        this.studentList = studentList;
        this.listener = listener;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_student, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        final Student student = studentList.get(position);
        holder.bind(student, listener);
    }

    @Override
    public int getItemCount() {
        return studentList.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {
        private TextView nameTextView;
        private TextView ageTextView;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            nameTextView = itemView.findViewById(R.id.nameTextView);
            ageTextView = itemView.findViewById(R.id.ageTextView);
        }

        public void bind(final Student student, final OnItemClickListener listener) {
            nameTextView.setText(student.getName());
            ageTextView.setText(String.valueOf(student.getAge()));
            itemView.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    listener.onItemClick(student);
                }
            });
        }
    }
}

3. 在Activity或Fragment中实现RecyclerView的点击监听器，并在其中处理Parcelable ArrayList。

public class MainActivity extends AppCompatActivity implements StudentAdapter.OnItemClickListener {
    private RecyclerView recyclerView;
    private StudentAdapter studentAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        recyclerView = findViewById(R.id.recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        List studentList = new ArrayList<>();
        studentList.add(new Student("John", 20));
        studentList.add(new Student("Jane", 22));
        studentList.add(new Student("Bob", 21));

        studentAdapter = new StudentAdapter(studentList, this);
        recyclerView.setAdapter(studentAdapter);
    }

    @Override
    public void onItemClick(Student student) {
        // 在这里处理Parcelable ArrayList
        Toast.makeText(this, "Clicked on " + student.getName(), Toast.LENGTH_SHORT).show();
    }
}

在上面的示例中，我们创建了一个包含名字和年龄的Student类，并实现了Parcelable接口。然后，在RecyclerView的适配器中，我们将点击事件添加到ViewHolder中，并通过回调将点击的项目传递给Activity或Fragment。最后，在Activity或Fragment中实现OnItemClickListener接口，并在其中处理Parcelable ArrayList。