Android開發本地及網絡Mp3音樂播放器(十五)網絡音樂及歌詞下載功能實現

實現功能：

實現網絡音樂歌詞下載功能(下載音樂的同時，下載對應歌詞)

下載好的歌詞目前不在播放器內，可以通過文件瀏覽器查看。
后續將博文，將實現本地音樂歌詞下載和已下載音樂掃描功能。

因為，沒有自己的服務器，所以網絡音樂所有相關功能(包含搜索音樂、下載音樂、下載歌詞)均無法保證時效性，建議，盡快下載和練習；如果你下載時候，已經因為我采集的服務器更改規則，請給我留言，如果可以解決，我將在有空的時候獻上新的源碼。

實現效果如圖：

實現代碼如下：
DownloadUtils如下：

package com.iwanghang.drmplayer.utils;

import android.os.Environment;
import android.os.Handler;
import android.os.Message;

import com.iwanghang.drmplayer.vo.SearchResult;
import com.squareup.okhttp.OkHttpClient;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

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

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import javax.xml.parsers.ParserConfigurationException;

/**
 * Created by iwanghang on 16/5/3.
 * 網絡音樂下載工具類
 */
public class DownloadUtils {

    private static final String DOWNLOAD_URL = "/download?_o=%2Fsearch%2Fsong";
    private static final int SUCCESS_LRC = 1;//下載歌詞成功
    private static final int FAILED_LRC = 2;//下載歌詞失敗
    private static final int SUCCESS_MP3 = 3;//下載歌曲成功
    private static final int FAILED_MP3 = 4;//下載歌曲失敗
    private static final int GET_MP3_URL = 5;//獲取音樂下載地址成功
    private static final int GET_FAILED_MP3_URL = 6;//獲取音樂下載地址失敗
    private static final int MUSIC_EXISTS = 7;//下載時,音樂已存在




    private static DownloadUtils sInstance;
    private OnDownloadListener mListener;

    private ExecutorService mThreadPool;

    /**
     *設置回調監聽器對象
     * @param mListener
     * @return
     */
    public DownloadUtils setListener(OnDownloadListener mListener){
        this.mListener = mListener;
        return this;
    }

    //獲取下載工具的實例
    public synchronized static DownloadUtils getsInstance(){
        if (sInstance == null){
            try {
                sInstance = new DownloadUtils();
            } catch (ParserConfigurationException e) {
                e.printStackTrace();
            }
        }
        return  sInstance;
    }

    /**
     * 下載的具體業務方法
     * @throws ParserConfigurationException
     */
    private DownloadUtils() throws ParserConfigurationException{
        mThreadPool = Executors.newSingleThreadExecutor();
    }

    public void download(final SearchResult searchResult){
        final Handler handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
               switch (msg.what){
                   case SUCCESS_LRC:
                       if (mListener != null) mListener.onDowload("歌詞下載成功");
                       break;
                   case FAILED_LRC:
                       if (mListener != null) mListener.onFailed("歌詞下載失敗");
                       break;
                   case GET_MP3_URL:
                       System.out.println("GET_MP3_URL:"+msg.obj);
                       downloadMusic(searchResult,(String)msg.obj,this);
                       break;
                   case GET_FAILED_MP3_URL:
                       if (mListener != null) mListener.onFailed("下載失敗,該歌曲為收費或VIP類型");
                       break;
                   case SUCCESS_MP3:
                       if (mListener != null) mListener.onDowload(searchResult.getMusicName()+"已經下載");
                       String url = Constant.MIGU_URL + searchResult.getUrl();
                       System.out.println("download lrc:"+url);
                       downloadLRC(url,searchResult.getMusicName(),searchResult.getArtist(),this);
                       break;
                   case FAILED_MP3:
                       if (mListener != null) mListener.onFailed(searchResult.getMusicName()+"下載失敗");
                       break;
                   case MUSIC_EXISTS:
                       if (mListener != null) mListener.onFailed("音樂已存在");
                       break;
               }
            }
        };
        getDownloadMusicURL(searchResult,handler);
    }

    //獲取下載歌詞的URL
    private void getDownloadLrcURL(final SearchResult searchResult, final Handler handler) {
        mThreadPool.execute(new Runnable() {
            @Override
            public void run() {
                //http://music.baidu.com/search/lrc?key=%E6%9C%89%E5%BF%83%E4%BA%BA%20G.E.M.%E9%82%93%E7%B4%AB%E6%A3%8B
                //"http://music.baidu.com/search/lrc?key=" + 歌名 + " " + 歌手
                //System.out.println("searchResult.getUrl() = " + searchResult.getUrl());
                //String[] aa = searchResult.getUrl().split("/");
                //String sn = aa[5];
                //System.out.println("歌曲編號 = " + sn);

                //從瀏覽器復制出來的Url是這樣的,"http://music.baidu.com/search?key=%E6%B2%A1%E6%9C%89";
                //漢字經過utf8編碼,比如 冰雨 == %E5%86%B0%E9%9B%A8;
                //經過測試 獲取頁面 使用"http://music.baidu.com/search?key=冰雨";無法打開正確連接
                //比如使用URLEncoder.encode轉碼,轉為utf8
                //實際使用 獲取頁面 使用"http://music.baidu.com/search?key=%E6%B2%A1%E6%9C%89";
                try {
                    String musicName = URLEncoder.encode(searchResult.getMusicName(), "utf8");
                    String artistName = URLEncoder.encode(searchResult.getArtist(), "utf8");
                    //String url = Constant.BAIDU_LRC_SEARCH_HEAD + searchResult.getMusicName() + " " + searchResult.getArtist();
                    String url = Constant.BAIDU_LRC_SEARCH_HEAD + musicName + "+" + artistName;
                    System.out.println("歌詞下載頁面url = " + url);

                    Document doc = Jsoup.connect(url).userAgent(Constant.USER_AGENT).timeout(6000).get();
                    //System.out.println("歌詞下載頁面 doc : " + doc);

                    Elements lrcUrls = doc.select("span.lyric-action");
                    System.out.println(lrcUrls);

                    for (int i=0;i下載LRC歌詞
                            if (urla.indexOf("'href':'")>0){
                                String[] uu = urla.split("'href':'");
                                System.out.println("uu1 : " + uu[1]);
                                //uu1 : /data2/lrc/14488216/14488216.lrc' }" href="#">下載LRC歌詞
                                String[] uuu = uu[1].split(".lrc");
                                System.out.println("uuu0 : " + uuu[0]);
                                //uuu0 : /data2/lrc/14488216/14488216
                                String result = "http://music.baidu.com" + uuu[0] + ".lrc";
                                System.out.println("result : " + result);
                                //result :  http://music.baidu.com/data2/lrc/14488216/14488216.lrc
                                Message msg = handler.obtainMessage(SUCCESS_LRC,result);
                                msg.sendToTarget();
                                break;
                            }
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                    handler.obtainMessage(FAILED_LRC).sendToTarget();
                }

            }
        });
    }


    //獲取下載音樂的URL
    private void getDownloadMusicURL(final SearchResult searchResult, final Handler handler) {
        mThreadPool.execute(new Runnable() {
            @Override
            public void run() {
                //http://music.migu.cn/#/album/1003215276
                //1003215279
                //http://music.migu.cn/order/1003215279/down/self/P2Z3Y12L1N2/3/001002A/1003215279
                System.out.println("searchResult.getUrl() = " + searchResult.getUrl());
                String[] aa = searchResult.getUrl().split("/");
                String sn = aa[5];
                System.out.println("歌曲編號 = " + sn);
                String url = Constant.MIGU_DOWN_HEAD + sn + Constant.MIGU_DOWN_FOOT;
                System.out.println("歌曲下載頁面url = " + url);

                try {
                    Document doc = Jsoup.connect(url).userAgent(Constant.USER_AGENT).timeout(6000).get();
                    //System.out.println(doc);

                    System.out.println("doc.toString() = " + doc.toString());
                    String[] bb = doc.toString().split("song");//把 下載頁面源碼 按照"song"分割
                    for (int i=0;i0){
                            System.out.println("mp3?msisdn = " + bb[i]);
                            String initMp3Url = bb[i];//initMp3Url 初始Mp3下載鏈接,如下
                            //mp3?msisdn = ":"http://tyst.migu.cn/public/ringmaker01/10月31日中文延期/文件/全套格式/9000首/全曲試聽/Mp3_128_44_16/一起走過的日子-劉德華.mp3?msisdn\u003d7b609763f0ff","

                            String[] arrayHttp = initMp3Url.split("http");//把 初始Mp3下載鏈接 按照"http"分割
                            String[] arrayMp3 = arrayHttp[1].split(".mp3");//把 arrayHttp 按照".mp3"分割
                            String result = "http" + arrayMp3[0] + ".mp3";//把分割去掉的"http"和".mp3",組合回來
                            System.out.println("result");

                            //String result = "http://tyst.migu.cn/public/ringmaker01/10月31日中文延期/文件/全套格式/9000首/全曲試聽/Mp3_128_44_16/一起走過的日子-劉德華.mp3";
                            Message msg = handler.obtainMessage(GET_MP3_URL,result);
                            msg.sendToTarget();
                        }
                    }

                } catch (IOException e) {
                    e.printStackTrace();
                    handler.obtainMessage(GET_FAILED_MP3_URL).sendToTarget();
                }
            }
        });
    }


    //下載歌詞
    private void downloadLRC(final String url, final String musicName, final String artistName,final Handler handler){
        mThreadPool.execute(new Runnable() {
            @Override
            public void run() {


                //從瀏覽器復制出來的Url是這樣的,"http://music.baidu.com/search?key=%E6%B2%A1%E6%9C%89";
                //漢字經過utf8編碼,比如 冰雨 == %E5%86%B0%E9%9B%A8;
                //經過測試 獲取頁面 使用"http://music.baidu.com/search?key=冰雨";無法打開正確連接
                //比如使用URLEncoder.encode轉碼,轉為utf8
                //實際使用 獲取頁面 使用"http://music.baidu.com/search?key=%E6%B2%A1%E6%9C%89";
                try {
                    String musicNameEn = URLEncoder.encode(musicName, "utf8");
                    String artistNameEn = URLEncoder.encode(artistName, "utf8");
                    //String url = Constant.BAIDU_LRC_SEARCH_HEAD + searchResult.getMusicName() + " " + searchResult.getArtist();
                    String url = Constant.BAIDU_LRC_SEARCH_HEAD + musicNameEn + "+" + artistNameEn;
                    System.out.println("歌詞下載頁面url = " + url);

                    Document doc = Jsoup.connect(url).userAgent(Constant.USER_AGENT).timeout(6000).get();
                    //System.out.println("歌詞下載頁面 doc : " + doc);

                    Elements lrcUrls = doc.select("span.lyric-action");
                    System.out.println(lrcUrls);

                    for (int i = 0; i < lrcUrls.size(); i++) {
                        Elements urlsa = lrcUrls.get(i).getElementsByTag("a");
                        System.out.println("tag a urlsa : " + urlsa);
                        for (int a = 0; a < urlsa.size(); a++) {
                            //System.out.println("----" + urlsa.get(a).toString());
                            String urla = urlsa.get(a).toString();
                            System.out.println("-----" + urla);
                            //-----下載LRC歌詞
                            if (urla.indexOf("'href':'") > 0) {
                                String[] uu = urla.split("'href':'");
                                System.out.println("uu1 : " + uu[1]);
                                //uu1 : /data2/lrc/14488216/14488216.lrc' }" href="#">下載LRC歌詞
                                String[] uuu = uu[1].split(".lrc'");
                                System.out.println("uuu0 : " + uuu[0]);
                                //uuu0 : /data2/lrc/246970367/246970367.lrc
                                String lrcDwonUrl = "http://music.baidu.com" + uuu[0] + ".lrc";
                                System.out.println("lrcDwonUrl : " + lrcDwonUrl);
                                //result :  http://music.baidu.com/data2/lrc/14488216/14488216.lrc


                                File LrcDirFile = new File(Environment.getExternalStorageDirectory() + Constant.DIR_LRC);
                                System.out.println("LrcDirFile : " + LrcDirFile);
                                if (!LrcDirFile.exists()) {
                                    LrcDirFile.mkdirs();
                                }
                                String target = LrcDirFile + "/" + musicName + ".lrc";
                                System.out.println("lrcDwonUrl : " + lrcDwonUrl);
                                System.out.println("target : " + target);
                                File fileTarget = new File(target);
                                if (fileTarget.exists()) {
                                    handler.obtainMessage(MUSIC_EXISTS).sendToTarget();
                                    return;
                                } else {
                                    OkHttpClient client = new OkHttpClient();
                                    Request request = new Request.Builder().url(lrcDwonUrl).build();
                                    Response response = client.newCall(request).execute();
                                    if (response.isSuccessful()) {
                                        PrintStream ps = new PrintStream(new File(target));
                                        byte[] bytes = response.body().bytes();
                                        ps.write(bytes, 0, bytes.length);
                                        ps.close();
                                        handler.obtainMessage(SUCCESS_LRC, target).sendToTarget();
                                    }
                                }
                            }
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        });
    }


    //下載MP3
    private void downloadMusic(final SearchResult searchResult,final String url,final Handler handler){
        mThreadPool.execute(new Runnable() {
            @Override
            public void run() {
                File musicDirFile = new File(Environment.getExternalStorageDirectory()+Constant.DIR_MUSIC);
                if (!musicDirFile.exists()){
                    musicDirFile.mkdirs();
                }

                String mp3url = url;
                //String mp3url = "http://tyst.migu.cn/public/600902-2008430/tone/2008/09/10/2008年9月/4月環球106首歌曲/彩鈴/7_mp3-128kbps/等你等到我心痛-張學友.mp3";

                String target = musicDirFile + "/" + searchResult.getMusicName() + ".mp3";
                System.out.println(mp3url);
                System.out.println(target);
                File fileTarget = new File(target);
                if (fileTarget.exists()){
                    handler.obtainMessage(MUSIC_EXISTS).sendToTarget();
                    return;
                }else {
                    //使用OkHttpClient組件
                    OkHttpClient client = new OkHttpClient();
                    Request request = new Request.Builder().url(mp3url).build();
                    System.out.println(request);
                    try {
                        Response response = client.newCall(request).execute();
                        if (response.isSuccessful()){
                            PrintStream ps = new PrintStream(fileTarget);
                            byte[] bytes = response.body().bytes();
                            ps.write(bytes,0,bytes.length);
                            ps.close();
                            handler.obtainMessage(SUCCESS_MP3).sendToTarget();
                        }
                    } catch (IOException e) {
                        e.printStackTrace();
                        handler.obtainMessage(FAILED_MP3).sendToTarget();
                    }
                }
            }
        });
    }

    //自定義下載事件監聽器
    public interface OnDownloadListener {
        public void onDowload(String mp3Url);
        public void onFailed(String error);
    }
}