android SwipeRefreshLayout 下拉刷新控件使用

导入库文件

implementation 'com.android.support:recyclerview-v7:28.0.0'implementation 'com.scwang.smartrefresh:SmartRefreshLayout:1.1.0-alpha-28'

class

public class MainActivity extends AppCompatActivity {    RecyclerView rv_list;    RefreshLayout mRefreshLayout;    ArrayList mEntityList = new ArrayList();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initData();        initUI();    }    private void initUI() {        rv_list = findViewById(R.id.rv_list);        mRefreshLayout = findViewById(R.id.refrest);        // 定义一个线性布局管理器        LinearLayoutManager manager = new LinearLayoutManager(this);        // 设置布局管理器        rv_list.setLayoutManager(manager);        // 设置adapter        final DemoAdapter adapter = new DemoAdapter(MainActivity.this, mEntityList);        rv_list.setAdapter(adapter);        adapter.setOnItemClickLitener(new DemoAdapter.OnItemClickLitener() {            @Override            public void onItemClick(View view, int position) {                String str = (String) mEntityList.get(position);                Log.i("demo", str);            }        });        //刷新        mRefreshLayout.setOnRefreshListener(new OnRefreshListener() {            @Override            public void onRefresh(@NonNull RefreshLayout refreshLayout) {                initData();                adapter.notifyDataSetChanged();                mRefreshLayout.finishRefresh();            }        });        //加载更多        mRefreshLayout.setOnLoadMoreListener(new OnLoadMoreListener() {            @Override            public void onLoadMore(@NonNull RefreshLayout refreshLayout) {                initData();                adapter.notifyDataSetChanged();                refreshLayout.finishLoadMore();            }        });//        //开始下拉//        mRefreshLayout.setEnableRefresh(true);//启用刷新//        mRefreshLayout.setEnableLoadMore(true);//        //关闭下拉//        mRefreshLayout.finishRefresh();//        mRefreshLayout.finishLoadMore();    }    private void initData() {        for (int i = 'A'; i <= 'z'; i++) {            mEntityList.add((char) i + "");        }    }}

适配器

public class DemoAdapter extends RecyclerView.Adapter {    Context context;    ArrayList lists;    public DemoAdapter(Context context, ArrayList lists) {        this.context = context;        this.lists = lists;    }    @NonNull    @Override    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {        View view = LayoutInflater.from(context).inflate(R.layout.demo_adapter, viewGroup, false);        return new DemoViewHolder(view);    }    @Override    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {        String str = (String) lists.get(i);        final DemoViewHolder holder = (DemoViewHolder) viewHolder;        holder.tv_desc.setText(str);        if(mOnItemClickLitener!=null)        {            holder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    int pos = holder.getLayoutPosition();                    mOnItemClickLitener.onItemClick(holder.itemView, pos);                }            });        }    }    @Override    public int getItemCount() {        return lists.size();    }    private class DemoViewHolder extends RecyclerView.ViewHolder {        private TextView tv_desc;        public DemoViewHolder(@NonNull View itemView) {            super(itemView);            tv_desc = itemView.findViewById(R.id.tv_desc);        }    }    public interface OnItemClickLitener{        void onItemClick(View view, int position);    }    private OnItemClickLitener mOnItemClickLitener;    public void setOnItemClickLitener(OnItemClickLitener onItemClickLitener){        this.mOnItemClickLitener = onItemClickLitener;    }}

适配器文件

<?xml version="1.0" encoding="utf-8"?>

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