Bundle传值的使用

最新推荐文章于 2022-04-01 10:55:44 发布

原创最新推荐文章于 2022-04-01 10:55:44 发布 · 399 阅读

CC 4.0 BY-SA版权

本文深入剖析了NewsFragment类的实现细节，展示了如何通过继承Fragment并利用XListView和Gson进行新闻数据的异步加载与适配。同时，文章还介绍了如何使用AsyncTask执行后台HTTP请求，解析JSON数据，并更新UI。



import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.bwie.xlistview.XListView;
import com.google.gson.Gson;

import java.util.ArrayList;
import java.util.List;


public class NewsFragment extends Fragment {

    private String url;
    private static final String FLAG ="argu";
    private List<News.ResultBean.DataBean> list;
    private NewsAdapter adapter;
    private XListView xlistview;
    private int page = 1;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Bundle bundle = getArguments();
        url = bundle.getString("urls");

    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_news,container,false);
        xlistview = v.findViewById(R.id.xlv_news);
        return v;
    }


    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        list = new ArrayList<>();
        adapter = new NewsAdapter(getActivity(),list);
        xlistview.setAdapter(adapter);

        getData(page);

    }

    private void getData(int page) {
        new AsyncTask<String,Integer,String>(){

            @Override
            protected String doInBackground(String... strings) {
                return HttpUtils.getStringFromHttp(strings[0]);
            }

            @Override
            protected void onPostExecute(String s) {
                super.onPostExecute(s);
                Gson gson = new Gson();
                News news = gson.fromJson(s,News.class);
                list.clear();
                list.addAll(news.getResult().getData());
                adapter.notifyDataSetChanged();

            }
        }.execute(url+1);
    }
    public static NewsFragment newInstance(String str){
        NewsFragment newsFragment = new NewsFragment();
        Bundle bundle = new Bundle();
        bundle.putString(FLAG,str);
        newsFragment.setArguments(bundle);
        return newsFragment;
    }
}