android音乐播放器开发 SweetMusicPlayer 智能加载在线歌词

上一篇写了使用MediaPlayer播放音乐， http://blog.csdn.net/huweigoodboy/article/details/39862773，如果没有本地歌词怎么办？现在来将一下加载在线歌词。好了，还是用那张图。

在实现这个功能的时候，lz尝试过baidu api，歌词迷api，后来选用了歌词迷api，虽然还是资源不全，而且还有很多错误。特别头疼的是有时候歌词居然不分行，解析起来简直难受。

歌词迷api歌词查询地址：http://geci.me/api/lyric/

比如我要查询：   http://geci.me/api/lyric/安静/周杰伦

会得到一下json串：

{"count": 2, "code": 0, "result": [{"aid": 2223011, "artist_id": 30796, "song": "\u5b89\u9759", "lrc": "http://s.geci.me/lrc/257/25700/2570058.lrc", "sid": 2570058}, {"aid": 2336033, "artist_id": 30796, "song": "\u5b89\u9759", "lrc": "http://s.geci.me/lrc/272/27282/2728244.lrc", "sid": 2728244}]}

很容易发现里面的歌词文件，然后缓冲到本地（SweetMusicPlayer/Lryics）下，再按本地加载的方式就行了。

捋一捋，我们加载歌词文件要经过以下步骤。

1）通过地址查询出歌词的地址。（这里楼主用URLConnection）

2）通过歌词地址缓冲歌词文件。（这里楼主用URLConnection）

3）加载缓冲好的歌词文件。

上面说的看起来还是比较容易，楼主自己写了个demo,是一个java工程，发现没啥问题，正常加载歌词文件。

等到android上，第一步就跪了。发现URLConnection的getInputStream()抛出一个io异常，简直要命，折腾了半天才发现是因为带了http://geci.me/api/lyric/安静/周杰伦中文路径。由于默认是gbk，网络传输为utf-8,所以要把中文转码，URLEncoder.encode(str,"utf-8")；即可。

到了第2步，问题又出现了，歌词乱码。解决办法，用字符流操作比较合适，还要注意同一编码。

package com.huwei.sweetmusicplayer.util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Random;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.os.Environment;
import android.util.Log;

public class OnlineLrcUtil {
	private static String TAG = "OnlineLrcUtil";
	private static OnlineLrcUtil instance;
	public static final String lrcRootPath = Environment
			.getExternalStorageDirectory().toString()
			+ "/SweetMusicPlayer/Lyrics/";

	public static final String queryLrcURLRoot = "http://geci.me/api/lyric/";

	public static OnlineLrcUtil getInstance() {
		if (null == instance) {
			instance = new OnlineLrcUtil();
		}

		return instance;
	}

	public String getQueryLrcURL(String title, String artist) {
		return queryLrcURLRoot + Encode(title) + "/" + Encode(artist);
	}

	public String getLrcURL(String title, String artist) {
		String queryLrcURLStr = getQueryLrcURL(title, artist);
		try {
			URL url = new URL(queryLrcURLStr);
			URLConnection urlConnection = url.openConnection();
			urlConnection.connect();

			BufferedReader in = new BufferedReader(new InputStreamReader(
					urlConnection.getInputStream()));

			StringBuffer sb = new StringBuffer();

			String temp;
			while ((temp = in.readLine()) != null) {
				sb.append(temp);
			}

			JSONObject jObject = new JSONObject(sb.toString());
			int count = jObject.getInt("count");
			int index = count == 0 ? 0 : new Random().nextInt() % count;
			JSONArray jArray = jObject.getJSONArray("result");
			JSONObject obj = jArray.getJSONObject(index);
			return obj.getString("lrc");

		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (JSONException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return null;
	}

	// 歌手，歌曲名中的空格进行转码
	public String Encode(String str) {

		try {
			return URLEncoder.encode(str.trim(), "utf-8");
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return str;

	}

	// 歌词文件网络地址，歌词文件本地缓冲地址
	public boolean wrtieContentFromUrl(String urlPath, String lrcPath) {
		Log.i(TAG, "lrcURL" + urlPath);

		try {
			URL url = new URL(urlPath);

			URLConnection urlConnection = url.openConnection();
			urlConnection.connect();

			HttpURLConnection httpConn = (HttpURLConnection) urlConnection;
			if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				File file = new File(lrcRootPath);
				if (!file.exists()) {
					file.mkdirs();
				}

				BufferedReader bf = new BufferedReader(new InputStreamReader(
						urlConnection.getInputStream(), "utf-8"));
				PrintWriter out = new PrintWriter(new BufferedWriter(
						new OutputStreamWriter(new FileOutputStream(lrcPath),
								"utf-8")));

				char c[] = new char[256];
				int temp = -1;
				while ((temp = bf.read()) != -1) {
					bf.read(c);
					out.write(c);
				}

				bf.close();
				out.close();

				return true;
			}

			// System.out.println("getFile:"+str);
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return false;
	}

	public String getLrcPath(String title, String artist) {
		return lrcRootPath + title + " - " + artist + ".lrc";
	}
}