【达内课程】音乐播放器4.0（播放）
这一节我们需要实现播放歌曲的功能。想要实现播放歌曲，需要得到歌曲的url地址。由于上一节的接口中我们得到的歌曲列表中并没有歌曲地址，所以我们需要根据song_id再次发送请求，获取歌曲url
百度音乐api接口
流程如下
NewMusicListFragment
中给listview添加点击事件
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();
//执行业务层 加载这首歌曲的基本信息
model.loadMusicInfoBySongId(songId, new MusicInfoCallback() {
@Override
public void onMusicInfoLoaded(Songinfo songinfo, BitrateModel bitrateModel) {
music.setSonginfo(songinfo);
music.setBitrate(bitrateModel);
//准备通过url地址执行播放业务
}
});
}
});
}
......
}
MusicModel
中增加根据songid获取歌其他信息的方法
public class MusicModel {
/**
* 根据songid异步记载这首歌的其他信息
* @param songid
* @param callback
*/
public void loadMusicInfoBySongId(final String songid, final MusicInfoCallback callback){
AsyncTask<String,String,Music> task = new AsyncTask<String, String, Music>() {
//工作线程中发送请求 获取基本信息
@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交给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 {
//从上面传来的music
callback.onMusicInfoLoaded(music.getSonginfo(),music.getBitrate());
}
}
};
task.execute();
}
......
}
MusicInfoCallback
/**
* 音乐数据相关的回调接口
*/
public interface MusicInfoCallback {
/**
* 当音乐信息加载完成将会执行该方法
*/
void onMusicInfoLoaded(Songinfo songinfo,BitrateModel bitrateModel);
}
根据接口返回的json，需要再Model模型中增加
**
* 封装一首歌的信息
*/
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;
}
}
根据接口返回数据创建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;
......
省略各种set、get方法
}
根据接口返回数据创建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;// "李剑青",
public String song_id;// "604682907",
public String title;// "找到你（电影《找到你》同名主题曲）",
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（电影《找到你》同名主题曲）",
public String pic_small;
......
省略各种set、get方法
}
UrlFactory增加
/**
* 新歌榜url地址
* @param offSet
* @param size
* @return xml格式字符串
*/
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
来解析数据
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;
}
}
下一节中根据url来实现播放