频道管理（获取网络数据）

最新推荐文章于 2025-08-07 15:08:44 发布

迷人的脚毛

最新推荐文章于 2025-08-07 15:08:44 发布

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CC 4.0 BY-SA版权

文章标签：网络频道管理

本文链接：https://blog.youkuaiyun.com/qq_40090482/article/details/78037054

本文介绍了一个基于Android的应用案例，使用GridView实现频道选择功能。通过异步任务加载远程数据，并利用Gson进行JSON解析，实现了自定义适配器来展示频道列表。支持频道之间的拖拽操作。

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先来看看效果：

开始上代码，首先是布局：

MainActivity的布局：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="bawe.guotaian0920rikao.MainActivity">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:text="我的频道"
        android:textSize="40sp"
        android:layout_weight="1"
         />
    <GridView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="5"
        android:id="@+id/gv_gd"
        android:numColumns="3"
        ></GridView>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:text="推荐频道"
        android:textSize="40sp"
        android:layout_weight="1"
        />
    <GridView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="5"
        android:id="@+id/gv__wd"
        android:numColumns="3"
        ></GridView>


</LinearLayout>

======================================================================================

item布局：

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/tv_name"
    android:textSize="30sp"
    />
</LinearLayout>

==========================================

接下来

           MainActivity代码：

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.TextView;

import com.google.gson.Gson;

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

public class MainActivity extends Activity {
    GridView gv_wd, gv_gd;
    channeldata cd;
    List<String> list_top;
    List<String> list;
    private myadapter myadapter;
    private myadapter1 myadapter1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        gv_gd = (GridView) findViewById(R.id.gv_gd);
        gv_wd = (GridView) findViewById(R.id.gv__wd);
        initdata();
        myadapter = new myadapter();
        myadapter1 = new myadapter1();
        gv_gd.setAdapter(myadapter);
        gv_wd.setAdapter(myadapter1);

    }

    private void initdata() {
        // TODO Auto-generated method stub
        new AsyncTask<String, String, String>() {

            @Override
            protected String doInBackground(String... params) {
                // TODO Auto-generated method stub
                return getdata();
            }

            @Override
            protected void onPostExecute(String result) {
                // TODO Auto-generated method stub
                super.onPostExecute(result);
                Gson gson = new Gson();
                cd = gson.fromJson(result, channeldata.class);
                // Log.i("=====", cd.toString());
                list_top = new ArrayList<String>();
                list = new ArrayList<String>();
                for (int i = 0; i < cd.getChannel().size(); i++) {
                    list_top.add(cd.getChannel().get(i).getChannel_me());
                    list.add(cd.getChannel().get(i).getChannel_more());

                }
                gv_gd.setOnItemClickListener(new OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) {
                        // TODO Auto-generated method stub
                        list_top.add(list.get(position));
                        list.remove(position);
                        myadapter.notifyDataSetChanged();
                        myadapter1.notifyDataSetChanged();

                    }
                });
                gv_wd.setOnItemClickListener(new OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> parent, View view,
                                            int position, long id) {
                        // TODO Auto-generated method stub
                        list.add(list_top.get(position));
                        list_top.remove(position);
                        myadapter.notifyDataSetChanged();
                        myadapter1.notifyDataSetChanged();

                    }
                });

                myadapter.notifyDataSetChanged();
                myadapter1.notifyDataSetChanged();
            }

        }.execute();

    }

    class myadapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            if (list != null) {
                return list.size();
            }
            return 0;
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            ViewHolder holder;
            if (convertView == null) {
                convertView = View.inflate(MainActivity.this, R.layout.item,
                        null);
                holder = new ViewHolder();
                holder.tv_name = (TextView) convertView
                        .findViewById(R.id.tv_name);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            holder.tv_name.setText(list.get(position));

            return convertView;
        }

    }

    static class ViewHolder {
        TextView tv_name;

    }

    class myadapter1 extends BaseAdapter {

        private static final int Object = 0;

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            if (list_top != null) {
                return list_top.size();

            }
            return 0;
        }

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return list_top.get(position);
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            // TODO Auto-generated method stub
            ViewHolder1 holder1;
            if (convertView == null) {
                convertView = View.inflate(MainActivity.this, R.layout.item,
                        null);
                holder1 = new ViewHolder1();
                holder1.tv_name1 = (TextView) convertView
                        .findViewById(R.id.tv_name);
                convertView.setTag(holder1);
            } else {
                holder1 = (ViewHolder1) convertView.getTag();
            }
            holder1.tv_name1.setText(list_top.get(position));

            return convertView;
        }

    }

    static class ViewHolder1 {
        TextView tv_name1;

    }

    protected String getdata() {
        // TODO Auto-generated method stub
        String result = null;
        try {
            URL url = new URL(
                    "http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=channel");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            int code = conn.getResponseCode();
            if (code == 200) {
                InputStream is = conn.getInputStream();
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                int len = -1;
                byte[] buff = new byte[1024];
                while ((len = is.read(buff)) != -1) {
                    bos.write(buff, 0, len);

                }
                result = new String(bos.toByteArray());
            }

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

        return result;
    }

}
最后写一个接口封装类就好了，接口http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=channel