重写onResume()方法实现activity的刷新

好的，针对你的问题，我给出以下实现：

public class RefreshActivity extends AppCompatActivity {

    private RecyclerView mRecyclerView;
    private List<String> mDataList;
    private MyAdapter mAdapter;

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

        // 初始化 RecyclerView
        mRecyclerView = findViewById(R.id.recycler_view);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mDataList = new ArrayList<>();
        mAdapter = new MyAdapter(mDataList);
        mRecyclerView.setAdapter(mAdapter);
    }

    @Override
    protected void onResume() {
        super.onResume();

        // 刷新数据
        mDataList.clear();
        mDataList.addAll(getDataList());
        mAdapter.notifyDataSetChanged();
    }

    private List<String> getDataList() {
        // 模拟获取数据
        List<String> dataList = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            dataList.add("数据 " + i);
        }
        return dataList;
    }

    private class MyAdapter extends RecyclerView.Adapter<MyViewHolder> {

        private List<String> dataList;

        public MyAdapter(List<String> dataList) {
            this.dataList = dataList;
        }

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

        @Override
        public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
            holder.textView.setText(dataList.get(position));
        }

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

    private class MyViewHolder extends RecyclerView.ViewHolder {

        private TextView textView;

        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            textView = itemView.findViewById(R.id.text_view);
        }
    }
}

这是一个简单的 RecyclerView 刷新示例，我们在 `onResume()` 方法中进行了数据的刷新操作。需要注意的是，我们在 `MyAdapter` 中实现了 `onCreateViewHolder()`、`onBindViewHolder()` 和 `getItemCount()` 方法来设置 RecyclerView 的布局和数据。在 `MyViewHolder` 中我们定义了 `TextView`，用于显示数据。当我们进行数据刷新时，先调用 `getDataList()` 方法获取最新数据，然后通过 `mAdapter.notifyDataSetChanged()` 刷新数据。