退出并重新进入activity或按back按钮后加载Recyclerview

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

@Override
protected void onResume() {
    super.onResume();
    
    // 重新加载数据
    List<Data> dataList = fetchData(); // 获取数据的方法
    MyAdapter adapter = new MyAdapter(dataList); // 创建适配器
    recyclerView.setAdapter(adapter); // 设置适配器
}

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    private List<Data> dataList;

    // 构造函数
    public MyAdapter(List<Data> dataList) {
        this.dataList = dataList;
    }

    // ViewHolder类
    public class ViewHolder extends RecyclerView.ViewHolder {
        public TextView textView;

        public ViewHolder(View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.textView);
        }
    }

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

    // 绑定ViewHolder
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        Data data = dataList.get(position);
        holder.textView.setText(data.getTitle());
        
        // 处理点击事件
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 处理点击事件
            }
        });
    }

    // 获取数据项数量
    @Override
    public int getItemCount() {
        return dataList.size();
    }
}