本文共 7329 字，大约阅读时间需要 24 分钟。

在Android应用中实现下拉刷新和上拉加载功能，可以按照以下步骤进行：

一、布局文件代码主界面main.xml：

列表项布局（项数布局）：

底部footView布局：

二、后台代码逻辑适配器MyAdapter：

public class MyAdapter extends RecyclerView.Adapter {    private List
   
     datas;    private Context context;    private int normalType = 0;    private int footType = 1;    private boolean hasMore = true;    private Handler mHandler = new Handler(Looper.getMainLooper());    public MyAdapter(List
    
      datas, Context context, boolean hasMore) {        this.datas = datas;        this.context = context;        this.hasMore = hasMore;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        if (viewType == normalType) {            return new NormalHolder(LayoutInflater.from(context).inflate(R.layout.item, null));        } else {            return new FootHolder(LayoutInflater.from(context).inflate(R.layout.footview, null));        }    }    @Override    public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position) {        if (holder instanceof NormalHolder) {            ((NormalHolder) holder).textView.setText(datas.get(position));        } else {            ((FootHolder) holder).tips.setVisibility(View.VISIBLE);            if (hasMore) {                if (!datas.isEmpty()) {                    ((FootHolder) holder).tips.setText("正在加载更多...");                }            } else {                if (!datas.isEmpty()) {                    ((FootHolder) holder).tips.setText("没有更多数据了");                    mHandler.postDelayed(new Runnable() {                        @Override                        public void run() {                            ((FootHolder) holder).tips.setVisibility(View.GONE);                            hasMore = true;                        }                    }, 500);                }            }        }    }    @Override    public int getItemCount() {        return datas.size() + 1;    }    @Override    public int getRealLastPosition() {        return datas.size();    }    public void updateList(List
     
       newDatas, boolean hasMore) {        if (newDatas != null) {            datas.addAll(newDatas);        }        this.hasMore = hasMore;        notifyDataSetChanged();    }    class NormalHolder extends RecyclerView.ViewHolder {        private TextView textView;        public NormalHolder(View itemView) {            super(itemView);            textView = (TextView) itemView.findViewById(R.id.tv);        }    }    class FootHolder extends RecyclerView.ViewHolder {        private TextView tips;        public FootHolder(View itemView) {            super(itemView);            tips = (TextView) itemView.findViewById(R.id.tips);        }    }    public boolean isFadeTips() {        return fadeTips;    }    public void resetDatas() {        datas = new ArrayList<>();    }    @Override    public int getItemViewType(int position) {        if (position == getItemCount() - 1) {            return footType;        } else {            return normalType;        }    }}
     
    
   

MainActivity：

public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener {    private SwipeRefreshLayout refreshLayout;    private RecyclerView recyclerView;    private List
   
     list;    private int lastVisibleItem = 0;    private final int PAGE_COUNT = 30;    private GridLayoutManager mLayoutManager;    private MyAdapter adapter;    private Handler mHandler = new Handler(Looper.getMainLooper());    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        findView();        initRefreshLayout();        initRecyclerView();    }    private void initData() {        list = new ArrayList<>();        for (int i = 1; i <= 60; i++) {            list.add("条目" + i);        }    }    private void findView() {        refreshLayout = (SwipeRefreshLayout) findViewById(R.id.refreshLayout);        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);    }    private void initRefreshLayout() {        refreshLayout.setColorSchemeResources(android.R.color.holo_blue_light,                android.R.color.holo_red_light, android.R.color.holo_orange_light,                android.R.color.holo_green_light);        refreshLayout.setOnRefreshListener(this);    }    private void initRecyclerView() {        adapter = new MyAdapter(getDatas(0, PAGE_COUNT), this, getDatas(0, PAGE_COUNT).size() > 0 ? true : false);        mLayoutManager = new GridLayoutManager(this, 1);        recyclerView.setLayoutManager(mLayoutManager);        recyclerView.setAdapter(adapter);        recyclerView.setItemAnimator(new DefaultItemAnimator());        recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                super.onScrollStateChanged(recyclerView, newState);                if (newState == RecyclerView.SCROLL_STATE_IDLE) {                    if (!adapter.isFadeTips() && lastVisibleItem + 1 == adapter.getItemCount()) {                        mHandler.postDelayed(new Runnable() {                            @Override                            public void run() {                                updateRecyclerView(adapter.getRealLastPosition(), adapter.getRealLastPosition() + PAGE_COUNT);                            }                        }, 500);                    }                    if (adapter.isFadeTips() && lastVisibleItem + 2 == adapter.getItemCount()) {                        mHandler.postDelayed(new Runnable() {                            @Override                            public void run() {                                updateRecyclerView(adapter.getRealLastPosition(), adapter.getRealLastPosition() + PAGE_COUNT);                            }                        }, 500);                    }                }            }            @Override            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {                super.onScrolled(recyclerView, dx, dy);                lastVisibleItem = mLayoutManager.findLastVisibleItemPosition();            }        });    }    private List
    
      getDatas(final int firstIndex, final int lastIndex) {        List
     
       resList = new ArrayList<>();        for (int i = firstIndex; i < lastIndex; i++) {            if (i < list.size()) {                resList.add(list.get(i));            }        }        return resList;    }    private void updateRecyclerView(int fromIndex, int toIndex) {        List
      
        newDatas = getDatas(fromIndex, toIndex);        if (newDatas.size() > 0) {            adapter.updateList(newDatas, true);        } else {            adapter.updateList(null, false);        }    }    @Override    public void onRefresh() {        refreshLayout.setRefreshing(true);        adapter.resetDatas();        updateRecyclerView(0, PAGE_COUNT);        mHandler.postDelayed(new Runnable() {            @Override            public void run() {                refreshLayout.setRefreshing(false);            }        }, 1000);    }}
      
     
    
   

以上代码实现了下拉刷新和上拉加载功能，可以根据实际需求调整数据获取方式。如果需要网络数据获取，请在Main Activity中替换为网络请求逻辑。