httpclient和handler请求网络

最新推荐文章于 2024-09-29 16:20:55 发布

lv_l

最新推荐文章于 2024-09-29 16:20:55 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qq_43603798/article/details/83719684

本文介绍了一个使用Android的Fragment展示新闻列表的应用实例。通过自定义Adapter和Handler，从指定URL获取新闻数据，并在ListView中显示。同时，展示了如何在后台线程中调用HTTP客户端获取数据，然后更新UI。

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public class Frag_02 extends Fragment {

String urlString = "http://api.expoon.com/AppNews/getNewsList/type/1/p/1";
String urlBitmap = "https://img-my.youkuaiyun.com/uploads/201407/26/1406383265_8550.jpg";
String tag = "lv";
ArrayList<Product.DataBean> list02 = new ArrayList<Product.DataBean>();
private ListView listView02;
Handler handler = new Handler(){
    @Override
    public void handleMessage(Message msg) {
        super.handleMessage(msg);
        if (msg.what==1){
            //自定义Adapter
            MyAdapter02 myAdapter02 = new MyAdapter02(getActivity(),list02);
            //设置适配器
            listView02.setAdapter(myAdapter02);
        }
    }
};

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.frag_02, container, false);
    listView02 = view.findViewById(R.id.list02);
    new Thread() {
        @Override
        public void run() {
            super.run();
            List<Product.DataBean> list = Netb.getHttpClient(urlString);
            Message message = handler.obtainMessage();
            message.what = 1;
            message.obj = list;
            handler.sendMessage(message);
        }
    }.start();
    return view;
}

}
Net页面

public class Netb {

private static String s;

public static List<Product.DataBean> getHttpClient(String urlString) {
    //获取请求
    DefaultHttpClient defaultHttpClient = new DefaultHttpClient();
    //创建请求方式
    HttpGet httpGet = new HttpGet();

    try {
        //执行接口
        HttpResponse execute = defaultHttpClient.execute(httpGet);
        //获取执行的状态码
        int statusCode = execute.getStatusLine().getStatusCode();
        if (statusCode == 200){
            //获取实体类
            HttpEntity entity = execute.getEntity();
            s = EntityUtils.toString(entity);
        }
        //开始解析
        Gson gson = new Gson();
        Product product = gson.fromJson(s, Product.class);
        List<Product.DataBean> datas = product.getData();
        return datas;

    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

}