HttpConnection的get请求

最新推荐文章于 2020-06-13 11:42:43 发布

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本文介绍了一个使用Android进行网络数据加载并展示到ListView的应用实例。通过HTTPURLConnection获取JSON数据，并利用Gson解析JSON数据，最后将解析后的数据绑定到自定义适配器中显示。

package com.liulailin.cc;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.google.gson.Gson;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;

import static android.R.attr.data;
import static android.R.id.list;

public class MainActivity extends AppCompatActivity {

    String path ="http://www.meirixue.com/api.php?c=index&a=index";
    private ListView lv;
     List<AA.DataBean.AdlistBean> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView) findViewById(R.id.lv);

        new Thread(){

            @Override
            public void run() {
                super.run();
                String json = getdata();
                Gson gson = new Gson();
                AA aa = gson.fromJson(json, AA.class);
                list = aa.getData().getAdlist();

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(MainActivity.this, list.get(0).getName(), Toast.LENGTH_SHORT).show();

                        lv.setAdapter(new MyAdapter());
                    }
                });
            }
        }.start();

       // lv.setAdapter(new MyAdapter());

    }

    /**
     * httpurlconnection
     * @return
     */
    public String getdata() {

        try {
            URL url = new URL(path);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setConnectTimeout(5000);

            int responseCode = urlConnection.getResponseCode();

            if (responseCode == 200) {
                InputStream is = urlConnection.getInputStream();
                int len;
                byte[] arr = new byte[1024 * 20];
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                while ((len = is.read(arr)) != -1) {
                    baos.write(arr, 0, len);
                }

                return baos.toString();

            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

    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) {

            TextView tv = new TextView(MainActivity.this);
            tv.setText(list.get(i).getName());
            return tv;
        }
    }
}