PulltoRefresh上拉加载下拉刷新

需要权限

<uses-permission android:name="android.permission.INTERNET" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

需要依赖

compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'compile 'com.google.code.gson:gson:2.2.4'

需要导包

implementation project(':PullToRefreshLibrary')

PullToRefreshGridView布局

<com.handmark.pulltorefresh.library.PullToRefreshGridView       xmlns:ptr="http://schemas.android.com/apk/res-auto"       android:id="@+id/pull_refresh_grid"       android:layout_height="fill_parent"       android:layout_width="fill_parent"       android:numColumns="3"/>

public class MainActivity extends AppCompatActivity {    String uri;    int aa=1;    List<Bean.DataBean> list = new ArrayList<Bean.DataBean>();    private PullToRefreshListView pull;    private MyAdapter adapter;    private ImageLoader instance;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        pull = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);        pull.setMode(PullToRefreshBase.Mode.BOTH);        instance = ImageLoader.getInstance();        ListView lv = pull.getRefreshableView();        setUri(aa+"");        new GetDataTake().execute(uri);        adapter = new MyAdapter();        lv.setAdapter(adapter);        pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {            @Override            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {                list.clear();                aa=1;                setUri(aa+"");                new GetDataTake().execute(uri);            }            @Override            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {                aa++;                setUri(aa+"");                new GetDataTake().execute(uri);            }        });    }    class GetDataTake extends AsyncTask<String,Void,String> {        @Override        protected String doInBackground(String... strings) {            String aoto = Util.aoto(strings[0]);            return aoto;        }        @Override        protected void onPostExecute(String s) {            Gson gson=new Gson();            Bean bean = gson.fromJson(s, Bean.class);            List<Bean.DataBean> data = bean.getData();            list.addAll(data);            adapter.notifyDataSetChanged();            pull.onRefreshComplete();            super.onPostExecute(s);        }    }    class MyAdapter extends BaseAdapter{        @Override        public int getCount() {            return list.size();        }        @Override        public Object getItem(int i) {            return null;        }        @Override        public long getItemId(int i) {            return 0;        }        @Override        public View getView(int i, View view, ViewGroup viewGroup) {            if(view==null){                view=View.inflate(MainActivity.this,R.layout.activity_list,null);            }            ImageView iv_list = view.findViewById(R.id.iv_list);            TextView tv_list = view.findViewById(R.id.tv_list);            tv_list.setText(list.get(i).getNews_title());            instance.displayImage(list.get(i).getPic_url(),iv_list);            return view;        }    }    public void setUri(String aa){        uri="http://api.expoon.com/AppNews/getNewsList/type/1/p/"+aa;    }}