PullToRefreshListView刷新

最新推荐文章于 2018-11-20 21:17:37 发布

nyf19980311

最新推荐文章于 2018-11-20 21:17:37 发布

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本文链接：https://blog.youkuaiyun.com/nyf19980311/article/details/78350072

本文介绍了一个使用 PullToRefreshListView 控件实现下拉刷新和上拉加载更多功能的示例。通过 AsyncTask 异步获取数据，并展示了适配器 Adapter 的自定义实现，包括数据绑定和图片加载。

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xml:

<com.handmark.pulltorefresh.library.PullToRefreshListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/pull">
</com.handmark.pulltorefresh.library.PullToRefreshListView>

Activity:

public class Fragment1 extends Fragment{

//    List<Fragone_bean.DataBean> arr=new ArrayList();
    List<Fragone_bean.NewslistBean> arr = new ArrayList();
    private View view;
    private PullToRefreshListView pull;
    private ListView lv;
    private Adapter adapter;
    int i=0;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        view = inflater.inflate(R.layout.fragment1,null);
        pull = (PullToRefreshListView) view.findViewById(R.id.pull);
        return view;
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        pull.setMode(PullToRefreshBase.Mode.BOTH);
        lv = pull.getRefreshableView();
        adapter = new Adapter();
        lv.setAdapter(adapter);

//        new MyAsyncTask().execute("http://www.93.gov.cn/93app/data.do?channelId=0&startNum=0");
        new MyAsyncTask().execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page=1");
        pull.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                arr.clear();
                i=0;
                new MyAsyncTask().execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+i);
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                i=i+20;
                new MyAsyncTask().execute("https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10&page="+i);
            }
        });
    }

    class MyAsyncTask extends AsyncTask<String,Void,String>
    {

        @Override
        protected String doInBackground(String... strings) {
            String string="";
            StringBuffer stringBuffer=new StringBuffer();
            try {
                URL url = new URL(strings[0]);
//                URLConnection urlConnection = url.openConnection();
                HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                InputStream inputStream = urlConnection.getInputStream();
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
                while((string=bufferedReader.readLine())!=null)
                {
                    stringBuffer.append(string);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            return stringBuffer.toString();
        }

        @Override
        protected void onPostExecute(String s) {
            super.onPostExecute(s);
            Fragone_bean fragone_bean = new Gson().fromJson(s, Fragone_bean.class);
//            List<Fragone_bean.DataBean> data = fragone_bean.getData();
            List<Fragone_bean.NewslistBean> newslist = fragone_bean.newslist;
            arr.addAll(newslist);
            adapter.notifyDataSetChanged();
            pull.onRefreshComplete();
        }
    }
    class Adapter extends BaseAdapter {

        @Override
        public int getCount() {
            return arr.size();
        }

        @Override
        public Object getItem(int i) {
            return arr.get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }
        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            Sj sj = new Sj();
//            Fragone_bean.DataBean dataBean = arr.get(i);
            Fragone_bean.NewslistBean dataBean = arr.get(i);
            if(view==null)
            {
                view = View.inflate(getActivity(), R.layout.pulllist, null);
                sj.image=view.findViewById(R.id.iv);
                sj.tv=view.findViewById(R.id.tv);
                view.setTag(sj);
            }else
            {
                sj = (Sj) view.getTag();
            }
//            sj.tv.setText(dataBean.getSUBTITLE());
            sj.tv.setText(dataBean.title);
            DisplayImageOptions options=new DisplayImageOptions.Builder()
                    .cacheInMemory(true)//进行内存缓存
                    .cacheOnDisk(true)//进行sd卡缓存
                    .showImageOnLoading(R.drawable.zhengzaijiazai) // 设置正在下载中的图片
                    .showImageForEmptyUri(R.drawable.zhengzaijiazai) //没有请求地址时
                    .showImageOnFail(R.drawable.zhengzaijiazai)//下载错误时
                    .bitmapConfig(Bitmap.Config.RGB_565)//设置图片质量
                    .build();
//            ImageLoader.getInstance().displayImage(dataBean.getIMAGEURL(),sj.image,options);
            ImageLoader.getInstance().displayImage(dataBean.picUrl,sj.image,options);
            return view;
        }
    }
    class  Sj{
        ImageView image;
        TextView tv;
    }
}