PullToRefreshGridView上拉刷新，下拉加载

布局：

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

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:id="@+id/activity_main"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     tools:context="com.example.asus.pull_1.Activity.MainActivity">

    <com.handmark.pulltorefresh.library.PullToRefreshGridView

        android:id="@+id/gridview"

        android:layout_width="match_parent"

        android:layout_height="match_parent">

    </com.handmark.pulltorefresh.library.PullToRefreshGridView>

 </RelativeLayout>

Activity:

 public class MainActivity extends AppCompatActivity {

     @BindView(R.id.gridview)

     PullToRefreshGridView gridview;

     private int index=1;

     private ArrayList<Bean.DataBean> list;

     private AdapterListe adapterListe;

     private Retrofit builder;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         ButterKnife.bind(this);

         gridview.setMode(PullToRefreshBase.Mode.BOTH);//能下拉刷新和上拉加载  

         init();

     }

     private void init() {

         list = new ArrayList();

         adapterListe = new AdapterListe(list, MainActivity.this);//适配器

         gridview.setAdapter(adapterListe);

         loadData(index);

         gridview.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {

            //刷新

             @Override

             public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {

                  list.clear();

                 loadData(1);

                 gridview.postDelayed(new Runnable() {

                     @Override

                     public void run() {

                         gridview.onRefreshComplete();//加载完成后，设置刷新完成

                     }

                 },1000);

             }

             //加载

             @Override

             public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {

                 index++;

                 list.clear();

                 loadData(index);

                 gridview.postDelayed(new Runnable() {

                     @Override

                     public void run() {

                         gridview.onRefreshComplete();//加载完成后，设置刷新完成

                     }

                 },1000);

             }

         });

     }

     private void loadData(int index) {

       //解析

         builder = new Retrofit.Builder()

                 .baseUrl("http://www.qubaobei.com/")

                 .addConverterFactory(GsonConverterFactory.create())

                 .build();

         builder.create(HttpCall.class).getHttpCall(""+index).enqueue(new Callback<Bean>() {

             @Override

             public void onResponse(Call<Bean> call, Response<Bean> response) {

                 list.addAll(response.body().getData());//把获取到的数据放到集合里

                 adapterListe.notifyDataSetChanged();//加载完成后，设置刷新完成

             }

             @Override

             public void onFailure(Call<Bean> call, Throwable t) {

                 Toast.makeText(MainActivity.this, "请求失败", Toast.LENGTH_SHORT).show();

             }

         });

     }

 }

子布局：

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

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:orientation="vertical"

     android:layout_width="match_parent"

     android:layout_height="wrap_content">

     <TextView

         android:id="@+id/tv_title"

     android:layout_width="match_parent"

     android:layout_height="wrap_content" />

     <ImageView

         android:id="@+id/img"

         android:layout_width="match_parent"

         android:layout_height="wrap_content" />

     <TextView

         android:id="@+id/tv_food_str"

         android:layout_width="match_parent"

         android:layout_height="wrap_content" />

 </LinearLayout>

适配器：

 public class AdapterListe extends BaseAdapter{

     private List<Bean.DataBean> list;

     private Context context;

     public AdapterListe(List<Bean.DataBean> list, Context context) {

         this.list = list;

         this.context = context;

     }

     @Override

     public int getCount() {

         return list.size();

     }

     @Override

     public Object getItem(int i) {

         return list.get(i);

     }

     @Override

     public long getItemId(int i) {

         return i;

     }

     @Override

     public View getView(int i, View view, ViewGroup viewGroup) {

         view = LayoutInflater.from(context).inflate(R.layout.layout, viewGroup, false);

         TextView tv_title,tv_food_str;

         ImageView img;

         tv_title=view.findViewById(R.id.tv_title);

         tv_food_str=view.findViewById(R.id.tv_food_str);

         img=view.findViewById(R.id.img);

         tv_title.setText(list.get(i).getTitle());

         tv_food_str.setText(list.get(i).getFood_str());

         Glide.with(context).load(list.get(i).getPic()).into(img);

         return view;

     }

 }

接口：

 public interface HttpCall {

     @GET("ios/cf/dish_list.php?stage_id=1&limit=10&page=")//注解（get）获取

     Call<Bean> getHttpCall(@Query("page")String page);//注解（@Query）字符串拼接

 }

Bean类就不发了记着加网络权限和Library包添加依赖