Android使用HttpClient请求网络上的数据

最新推荐文章于 2017-10-30 15:38:52 发布

原创最新推荐文章于 2017-10-30 15:38:52 发布 · 366 阅读

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本文详细介绍了如何在Android应用中使用HTTP客户端访问网络API，获取数据并解析JSON格式，将其存储到SQLite数据库中，同时展示了如何在列表视图中显示解析后的数据，并通过点击事件触发自定义的AlertDialog。代码实现包含网络请求、数据库操作和UI更新的完整流程。

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package com.example.mouthTest;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.example.adapter.GoodAdapter;
import com.example.openheiper.GoodOpenHelper;
import com.example.vo.Good;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;


public class MainActivity extends Activity {

    private ListView mListView;
    private String url_path="http://169.254.4.103:8080/day_ServerSocket/data.json";
    private List<Good> list_good=new ArrayList<Good>();


    private GoodOpenHelper openHelper;
    private SQLiteDatabase sd;
    //定义适配器
    private GoodAdapter adapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        openHelper=new GoodOpenHelper(getApplicationContext(), "goods.db", null, 1);
        sd=openHelper.getReadableDatabase();

        //获取控件id
        mListView=(ListView) findViewById(R.id.mylistview);

        //定义线程，
        new Thread(){
            public void run() {
                try {
                    getinfo();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }.start();

        //点击item项，弹出alert
        mListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                // TODO Auto-generated method stub
                AlertDialog.Builder builder=new Builder(MainActivity.this);
                builder.setTitle(list_good.get(position).getFoodtitle()+list_good.get(position).getFoodcontent()+
                        list_good.get(position).getFoodprice()+list_good.get(position).getImageurl());


            }
        });
    }


    /**
     * 
     * 完成耗时操作，链接网络，访问数据并解析，，展示到界面上，并添加到数据库中
     * @throws IOException 
     * @throws ClientProtocolException 
     */
    private void getinfo() throws IOException {
        // TODO Auto-generated method stub
        HttpClient httpClient=new DefaultHttpClient();
        HttpGet httpGet=new HttpGet(url_path);
        HttpResponse execute = httpClient.execute(httpGet);
        int statusCode = execute.getStatusLine().getStatusCode();

        if (statusCode==200) {
            InputStream in = execute.getEntity().getContent();
            //得到文件
            InputStreamReader json=new InputStreamReader(in,"GBK");
            Gson gson=new Gson();
            list_good=gson.fromJson(json, new TypeToken<List<Good>>(){}.getType());
            Log.i("aaa",list_good.toString() );


             //便利集合中的数据，添加到数据库中
            for (Good g:list_good) {
                sd.execSQL("insert into good(id,imageurl,foodtitle,foodcontent,foodprice)values(null,?,?,?,?)",
                        new Object[]{g.getImageurl(),g.getFoodtitle(),g.getFoodcontent(),g.getFoodprice()});
            }

            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    // TODO Auto-generated method stub
                      //添加到适配器上
                    adapter=new GoodAdapter(MainActivity.this,list_good);
                    mListView.setAdapter(adapter);
                }
            });
        }
    };
}