[置顶] Android开发本地及网络Mp3音乐播放器(十二)创建NetMusicListAdapter、SearchResult显示网络音乐列表

实现功能：
实现NetMusicListAdapter（网络音乐列表适配器）
实现SearchResult（搜索音乐对象）
使用Jsoup组件请求网络,并解析音乐数据，并，音乐数据加载到列表中
实现FooterView

截止到目前的源码下载：
http://download.csdn.net/detail/iwanghang/9507635

Jsoup组件导入：
AndroidStudio简单快速导入GitHub中的第三方组件 ：
http://blog.csdn.net/iwanghang/article/details/51283763

Jsoup简介及中文API：
http://blog.csdn.net/iwanghang/article/details/51282403
http://blog.csdn.net/iwanghang/article/details/51283638
http://blog.csdn.net/iwanghang/article/details/51283659

欢迎移动开发爱好者交流：我的微信是iwanghang

另外，我打算开始找工作，如果沈阳或周边城市公司有意，也请与我联系。

实现效果如图：

FooterView:

实现代码如下：
NetMusicListFragment如下：

package com.iwanghang.drmplayer;

import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;


import com.iwanghang.drmplayer.adapter.MyMusicListAdapter;
import com.iwanghang.drmplayer.adapter.NetMusicListAdapter;
import com.iwanghang.drmplayer.utils.AppUtils;
import com.iwanghang.drmplayer.utils.Constant;
import com.iwanghang.drmplayer.utils.SearchMusicUtils;
import com.iwanghang.drmplayer.vo.Mp3Info;
import com.iwanghang.drmplayer.vo.SearchResult;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;

import java.io.IOException;
import java.util.ArrayList;

public class NetMusicListFragment extends Fragment implements OnItemClickListener,OnClickListener {

    private ListView listView_net_music;

    //private ArrayList<Mp3Info> mp3Infos;

    private LinearLayout load_layout;
    private LinearLayout ll_search_btn_container;
    private LinearLayout ll_search_container;
    private ImageButton ib_search_btn;
    private EditText et_search_content;

    private NetMusicListAdapter netMusicListAdapter;

    //存放 网络音乐 的集合
    private ArrayList<SearchResult> searchResults = new ArrayList<SearchResult>();

    private int page = 1;//搜索音乐的页码

    private MainActivity mainActivity;

    //private boolean isPause = false;//歌曲播放中的暂停状态

    private int position = 0;//当前播放的位置,提供给PlayActivity

    //onAttach(),当fragment被绑定到activity时被调用(Activity会被传入.).
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        //mainActivity = (MainActivity) context;
        mainActivity = (MainActivity) getActivity();
    }

    public static NetMusicListFragment newInstance() {
        NetMusicListFragment net = new NetMusicListFragment();
        return net;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        //UI组件初始化
        View view = inflater.inflate(R.layout.net_music_list_layout,null);
        //item
        listView_net_music = (ListView) view.findViewById(R.id.listView_net_music);
        //findViewById
        load_layout = (LinearLayout) view.findViewById(R.id.load_layout);
        ll_search_btn_container = (LinearLayout) view.findViewById(R.id.ll_search_btn_container);
        ll_search_container = (LinearLayout) view.findViewById(R.id.ll_search_container);
        ib_search_btn = (ImageButton) view.findViewById(R.id.ib_search_btn);
        et_search_content = (EditText) view.findViewById(R.id.et_search_content);

        //Item点击事件监听
        listView_net_music.setOnItemClickListener(this);
        //按钮点击事件监听
        ll_search_btn_container.setOnClickListener(this);
        ib_search_btn.setOnClickListener(this);
        loadNetData();//加载网络音乐
        return view;
    }

    private void loadNetData() {
        load_layout.setVisibility(View.VISIBLE);
        //加载网络音乐的异步任务
        new LoadNetDataTask().execute(Constant.BAIDU_URL + Constant.BAIDU_DAYHOT);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.ll_search_btn_container:
                ll_search_btn_container.setVisibility(View.GONE);
                ll_search_container.setVisibility(View.VISIBLE);
                break;
            case R.id.ib_search_btn:
                //搜索事件
                searchMusic();
                break;
        }
    }

    //搜索音乐
    private void searchMusic() {
        //隐藏键盘
        AppUtils.hideInputMethod(et_search_content);
        ll_search_btn_container.setVisibility(View.VISIBLE);
        ll_search_container.setVisibility(View.GONE);
        //获取输入的文字
        String key = et_search_content.getText().toString();
        if (TextUtils.isEmpty(key)){//如果为空,则,Toast提示
            Toast.makeText(mainActivity,"请输入歌手或歌词",Toast.LENGTH_SHORT).show();
            return;
        }
        load_layout.setVisibility(View.VISIBLE);//加载layout效果.显示
        //填充item 使用SearchMusicUtils搜索音乐工具类,并,使用观察者设计模式,自己回调,自己监听
        //SearchMusicUtils.
    }

    //加载网络音乐的异步任务
    //Android1.5提供了 工具类 android.os.AsyncTask，它使创建异步任务变得更加简单，不再需要编写任务线程和Handler实例即可完成相同的任务。
    class LoadNetDataTask extends AsyncTask<String,Integer,Integer>{
        //onPreExecute方法用于在执行后台任务前做一些UI操作
        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            load_layout.setVisibility(View.VISIBLE);//加载layout.显示
            listView_net_music.setVisibility(View.GONE);//item.隐藏
            searchResults.clear();//搜索结果.清理
        }

        //doInBackground方法内部执行后台任务,不可在此方法内修改UI
        @Override
        protected Integer doInBackground(String... params) {
            String url = params[0];
            try {
                //使用Jsoup组件请求网络,并解析音乐数据
                Document doc = Jsoup.connect(url).userAgent(Constant.USER_AGENT).timeout(6*1000).get();
//</span></span><span class="song-title " style='width: 240px;'><a href="/song/121353608" target="_blank" title="刘珂矣半壶纱" data-film="null">半壶纱</a></span><span class="singer"  style="width: 240px;" >							<span class="author_list" title="刘珂矣">
//<a hidefocus="true" href="/artist/132632388">刘珂矣</a>        	</span>
//</span></span><span class="song-title " style='width: 240px;'><a href="/song/264506450" target="_blank" title="韩磊千年一般若" data-film="null">千年一般若</a><div class="extra-info"><span class="appendix">影视原声</span></div></span><span class="singer"  style="width: 240px;" >							<span class="author_list" title="韩磊">
//<a hidefocus="true" href="/artist/1302">韩磊</a>        	</span>
                //从doc分析以上html代码;把所有span标签下song-title查找出来,存在songTitles集合中;即,歌名集合;
                //从doc分析以上html代码;把所有span标签下author_list查找出来,存在artists集合中;即,歌手集合;
                Elements songTitles = doc.select("span.song-title");
                Elements artists = doc.select("span.author_list");
                //System.out.println(artists);
                for (int i=0;i<songTitles.size();i++){
                    SearchResult searchResult = new SearchResult();
                    //System.out.println("@searchResult : " + searchResult);

                    //<a href="/song/121353608"
                    //<a href="/song/264506450"
                    //a链接,存在urls集合中;即,歌曲url集合;
                    //a链接,第一个a连接,href属性的值;即,最终的url;
                    //a链接,第一个a连接,text(a链接的内容,例:>半壶纱<,半壶纱就是a链接的内容);即,最终的歌名;
                    Elements urls = songTitles.get(i).getElementsByTag("a");
                    //System.out.println("@urls : " + urls);
                    searchResult.setUrl(urls.get(0).attr("href"));//设置最终的url
                    searchResult.setMusicName(urls.get(0).text());//设置最终的歌名

                    //a链接,存在urls集合中;即,歌曲url集合;
                    Elements artistElements = artists.get(i).getElementsByTag("a");
                    //System.out.println("@artistElements : " + artistElements);
                    searchResult.setArtist(artistElements.get(0).text());//设置最终的歌手

                    searchResult.setAlbum("热歌榜");//设置最终的专辑

                    System.out.println("@searchResult : " + searchResult);
                    searchResults.add(searchResult);//把最终的所有信息,添加到集合
                }
                System.out.println("@searchResults : " + searchResults);
                //System.out.println("@songTitles.size() : " + searchResults.size());
            } catch (IOException e) {
                e.printStackTrace();
                return -1;
            }
            return 1;
        }

        //onPostExecute方法用于在执行完后台任务后更新UI,显示结果
        @Override
        protected void onPostExecute(Integer result) {
            super.onPostExecute(result);
            if (result==1){
                netMusicListAdapter = new NetMusicListAdapter(mainActivity,searchResults);
                //System.out.println(searchResults);
                listView_net_music.setAdapter(netMusicListAdapter);
                listView_net_music.addFooterView(LayoutInflater.from(mainActivity).inflate(R.layout.footviwe_layout,null));
            }
            load_layout.setVisibility(View.GONE);
            listView_net_music.setVisibility(View.VISIBLE);
        }
    }




    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    }
}

NetMusicListAdapter如下：

package com.iwanghang.drmplayer.adapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.iwanghang.drmplayer.R;
import com.iwanghang.drmplayer.utils.MediaUtils;
import com.iwanghang.drmplayer.vo.Mp3Info;
import com.iwanghang.drmplayer.vo.SearchResult;

import java.util.ArrayList;

/**
 * 自定义的音乐列表适配器(网络)
 * 为了方便扩展，因为之前没有考虑到显示专辑封面
 * Created by iwanghang on 30/4/16.
 */
public class NetMusicListAdapter extends BaseAdapter{

    private Context ctx; //上下文对象引用
    private ArrayList<SearchResult> searchResults;//存放SearchResult引用的集合
    private SearchResult searchResult;//SearchResult对象引用
    //private int pos = -1;			//列表位置

    /**
     * 构造函数
     * @param ctx    上下文
     * @param searchResults  集合对象
     */
    public NetMusicListAdapter(Context ctx, ArrayList<SearchResult> searchResults){
        this.ctx = ctx;
        this.searchResults = searchResults;
        //System.out.println("MyMusicListAdapter.java #0 : ctx = " + ctx + ",mp3Infos = " + mp3Infos.size());
    }

    public ArrayList<SearchResult> searchResults() {
        System.out.println("NetMusicListAdapter.java #1 : public ArrayList<SearchResult> searchResults() {");
        return searchResults;
    }

    public void setSearchResults(ArrayList<SearchResult> searchResults) {
        System.out.println("NetMusicListAdapter.java #2 : public void setMp3Infos(ArrayList<SearchResult> searchResults) {");
        this.searchResults = searchResults;
    }


    @Override
    public int getCount() {
        //System.out.println("NetMusicListAdapter.java #3 : public int getCount() {" + mp3Infos.size());
        //return mp3Infos.size();
        return searchResults.size();
    }

    @Override
    public Object getItem(int position) {
        System.out.println("NetMusicListAdapter.java #4 : public Object getItem(int position) {");
        return searchResults.get(position);
    }

    @Override
    public long getItemId(int position) {
        //System.out.println("NetMusicListAdapter.java #5 : public long getItemId(int position) {");
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        //System.out.println("NetMusicListAdapter.java #6 : public View getView ");
        ViewHolder vh;
        if(convertView==null){
            //vh = new ViewHolder();
            convertView = LayoutInflater.from(ctx).inflate(R.layout.item_net_music_list,null);
            vh = new ViewHolder();
            vh.textView1_title = (TextView) convertView.findViewById(R.id.textView1_title);
            vh.textView2_singer = (TextView) convertView.findViewById(R.id.textView2_singer);
            //vh.textView3_time = (TextView) convertView.findViewById(R.id.textView3_time);
            //vh.imageView1_ablum = (ImageView) convertView.findViewById(R.id.imageView1_ablum);

            //System.out.println("NetMusicListAdapter.java #7 : textView1_title = " + vh.textView1_title);
            convertView.setTag(vh);//表示给View添加一个格外的数据，
        }else {
            vh = (ViewHolder)convertView.getTag();//通过getTag的方法将数据取出来
        }

        SearchResult searchResult = searchResults.get(position);
        vh.textView1_title.setText(searchResult.getMusicName());//显示标题
        vh.textView2_singer.setText(searchResult.getArtist());//显示歌手
        //vh.textView3_time.setText(MediaUtils.formatTime(mp3Info.getDuration()));//显示时长

        //获取专辑封面图片
        //Bitmap albumBitmapItem = MediaUtils.getArtwork(ctx,mp3Info.getId(),mp3Info.getAlbumId(),true,true);
        //System.out.println("NetMusicListAdapter.java #8 : albumBitmapItem = " + albumBitmapItem.getConfig());

        //改变播放界面专辑封面图片
        //vh.imageView1_ablum.setImageBitmap(albumBitmapItem);
        //vh.imageView1_ablum.setImageResource(R.mipmap.music);

        return convertView;
    }

    /**
     * 定义一个内部类
     * 声明相应的控件引用
     */
    static class ViewHolder{
        //所有控件对象引用
        TextView textView1_title;//标题
        TextView textView2_singer;//歌手
        //TextView textView3_time;//时长
        //ImageView imageView1_ablum;//专辑封面图片
    }
}

SearchResult如下：

package com.iwanghang.drmplayer.vo;

/**
 * Created by iwanghang on 16/4/29.
 * 搜索音乐的对象
 */
public class SearchResult {
    private String musicName;
    private String url;
    private String artist;
    private String album;
    private long size;//大小


    //set方法,get方法
    public String getMusicName() {
        return musicName;
    }

    public void setMusicName(String musicName) {
        this.musicName = musicName;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String artist) {
        this.artist = artist;
    }

    public String getAlbum() {
        return album;
    }

    public void setAlbum(String album) {
        this.album = album;
    }

    public long getSize() {
        return size;
    }

    public void setSize(long size) {
        this.size = size;
    }

    @Override
    public String toString() {
        return "SearchResult{" +
                "musicName='" + musicName + '\'' +
                ", url='" + url + '\'' +
                ", artist='" + artist + '\'' +
                ", album='" + album + '\'' +
                ", size=" + size +
                '}';
    }
}

footview_layout.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<TextView android:id="@+id/textView4"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="10dp"
    android:gravity="center"
    android:textSize="10sp"
    android:textColor="#a6a8a8"
    android:text="已经到最后了">
</TextView>