【達內課程】音樂播放器4.0（播放準備）
阿新 • • 發佈：2018-11-08
這一節我們需要實現播放歌曲的功能。想要實現播放歌曲，需要得到歌曲的url地址。由於上一節的介面中我們得到的歌曲列表中並沒有歌曲地址，所以我們需要根據song_id再次傳送請求，獲取歌曲url
百度音樂api介面
流程如下
NewMusicListFragment
中給listview新增點選事件
public class NewMusicListFragment extends Fragment { private ListView listView; private MusicAdapter adapter; private List<Music> musics; private MusicModel model = new MusicModel(); @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_music_list,null); setViews(view); setListeners(); ...... return view; } private void setListeners() { listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) { final Music music = musics.get(i); String songId = music.getSong_id(); Toast.makeText(getActivity(),"position:"+i,Toast.LENGTH_SHORT).show(); //執行業務層 載入這首歌曲的基本資訊 model.loadMusicInfoBySongId(songId, new MusicInfoCallback() { @Override public void onMusicInfoLoaded(Songinfo songinfo, BitrateModel bitrateModel) { music.setSonginfo(songinfo); music.setBitrate(bitrateModel); //準備通過url地址執行播放業務 } }); } }); } ...... }
MusicModel
中增加根據songid獲取歌其他資訊的方法
public class MusicModel { /** * 根據songid非同步記載這首歌的其他資訊 * @param songid * @param callback */ public void loadMusicInfoBySongId(final String songid, final MusicInfoCallback callback){ AsyncTask<String,String,Music> task = new AsyncTask<String, String, Music>() { //工作執行緒中傳送請求 獲取基本資訊 @Override protected Music doInBackground(String... strings) { String url = UrlFactory.getSongInfoUrl(songid); try { InputStream is = HttpUtils.getInputStream(url); String json = HttpUtils.isToString(is); Log.d("info",json); JSONObject object = new JSONObject(json); JSONObject songInfo = object.getJSONObject("songinfo"); JSONObject bitrate = object.getJSONObject("bitrate"); Songinfo songinfoModel = JSONParser.parseSongInfo(songInfo); BitrateModel bitrateModel = JSONParser.parseBitrate(bitrate); Music music = new Music(); music.setSonginfo(songinfoModel); music.setBitrate(bitrateModel); //把music交給onPostExecute return music; } catch (IOException e) { e.printStackTrace(); }catch (JSONException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Music music) { if(music == null){ callback.onMusicInfoLoaded(null,null); }else { //從上面傳來的music callback.onMusicInfoLoaded(music.getSonginfo(),music.getBitrate()); } } }; task.execute(); } ...... }
MusicInfoCallback
/**
* 音樂資料相關的回撥介面
*/
public interface MusicInfoCallback {
/**
* 當音樂資訊載入完成將會執行該方法
*/
void onMusicInfoLoaded(Songinfo songinfo,BitrateModel bitrateModel);
}
根據介面返回的json，需要再Model模型中增加
** * 封裝一首歌的資訊 */ public class Music { ...... private Songinfo songinfo; private BitrateModel bitrate; public Music() { ; } ...... public Songinfo getSonginfo() { return songinfo; } public void setSonginfo(Songinfo songinfo) { this.songinfo = songinfo; } public BitrateModel getBitrate() { return bitrate; } public void setBitrate(BitrateModel bitrate) { this.bitrate = bitrate; } @Override public String toString() { return this.title; } }
根據介面返回資料建立BitrateModel
public class BitrateModel {
private String show_link;//"http://zhangmenshiting.qianqian.com/data2/music/45bddc070feaeb4e690da721bf92a938/604682956/604682956.mp3?xcode=9ecab6d33c85c56ddcd0b1435228577d",
private String free;//1,
private String song_file_id;//604682956,
private String file_size;//3857267,
private String file_extension;//"mp3",
private String file_duration;//240,
private String file_bitrate;//128,
private String file_link;//"http://zhangmenshiting.qianqian.com/data2/music/45bddc070feaeb4e690da721bf92a938/604682956/604682956.mp3?xcode=9ecab6d33c85c56ddcd0b1435228577d",
private String hash;
......
省略各種set、get方法
}
根據介面返回資料建立SongInfo
public class Songinfo {
public String pic_huge;// "http://qukufile2.qianqian.com/data2/pic/920b3f0596b54f54a3c5575aabefe2b8/604682905/[email protected]_1,w_1000,h_1000",
public String pic_premium;// "http://qukufile2.qianqian.com/data2/pic/920b3f0596b54f54a3c5575aabefe2b8/604682905/[email protected]_1,w_500,h_500",
public String author;// "李劍青",
public String song_id;// "604682907",
public String title;// "找到你（電影《找到你》同名主題曲）",
public String artist_id;// "107692473",
public String lrclink;// "http://qukufile2.qianqian.com/data2/lrc/f1a7467936a4cff1c7c52483a741d4ce/605187388/605187388.lrc",
public String pic_big;// "http://qukufile2.qianqian.com/data2/pic/920b3f0596b54f54a3c5575aabefe2b8/604682905/[email protected]_1,w_150,h_150",
public String album_id;// "604682904",
public String pic_radio;// "http://qukufile2.qianqian.com/data2/pic/920b3f0596b54f54a3c5575aabefe2b8/604682905/[email protected]_1,w_300,h_300",
public String album_title;// "找到你（電影《找到你》同名主題曲）",
public String pic_small;
......
省略各種set、get方法
}
UrlFactory增加
/**
* 新歌榜url地址
* @param offSet
* @param size
* @return xml格式字串
*/
public static String getNewMusicListUrl(int offSet,int size){
String url = "http://tingapi.ting.baidu.com/v1/restserver/ting?format=xml&calback=&from=webapp_music&method=baidu.ting.billboard.billList&type=1&size="+size+"&offset="+offSet;
return url;
}
JSONParser
來解析資料
public class JSONParser {
public static Songinfo parseSongInfo(JSONObject songInfo) throws JSONException {
Songinfo songinfoModel = new Songinfo(
songInfo.getString("pic_huge") ,
songInfo.getString("pic_premium") ,
songInfo.getString("author") ,
songInfo.getString("song_id") ,
songInfo.getString("title") ,
songInfo.getString("artist_id") ,
songInfo.getString("lrclink") ,
songInfo.getString("pic_big") ,
songInfo.getString("album_id") ,
songInfo.getString("pic_radio") ,
songInfo.getString("album_title") ,
songInfo.getString("pic_small")
);
return songinfoModel;
}
public static BitrateModel parseBitrate(JSONObject bitrate) throws JSONException {
BitrateModel bitrateModel = new BitrateModel(
bitrate.getString("show_link") ,
bitrate.getString("free") ,
bitrate.getString("song_file_id") ,
bitrate.getString("file_size") ,
bitrate.getString("file_extension") ,
bitrate.getString("file_duration") ,
bitrate.getString("file_bitrate") ,
bitrate.getString("file_link") ,
bitrate.getString("hash")
);
return bitrateModel;
}
}
下一節中根據url來實現播放