我正在使用IcyStreamMeta.class检索元数据。这是IcyStreamMeta.class
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class IcyStreamMeta {
protected URL streamUrl;
private Map<String, String> metadata;
private boolean isError;
public IcyStreamMeta(URL streamUrl) {
setStreamUrl(streamUrl);
isError = false;
}
/**
* Get artist using stream's title
*
* @return String
* @throws IOException
*/
public String getArtist() throws IOException {
Map<String, String> data = getMetadata();
if (!data.containsKey("StreamTitle"))
return "";
String streamTitle = data.get("StreamTitle");
String title = streamTitle.substring(0, streamTitle.indexOf("-"));
return title.trim();
}
/**
* Get title using stream's title
*
* @return String
* @throws IOException
*/
public String getTitle() throws IOException {
Map<String, String> data = getMetadata();
if (!data.containsKey("StreamTitle"))
return "";
String streamTitle = data.get("StreamTitle");
String artist = streamTitle.substring(streamTitle.indexOf("-")+1);
return artist.trim();
}
public Map<String, String> getMetadata() throws IOException {
if (metadata == null) {
refreshMeta();
}
return metadata;
}
public void refreshMeta() throws IOException {
retreiveMetadata();
}
private void retreiveMetadata() throws IOException {
URLConnection con = streamUrl.openConnection();
con.setRequestProperty("Icy-MetaData", "1");
con.setRequestProperty("Connection", "close");
con.setRequestProperty("Accept", null);
con.connect();
int metaDataOffset = 0;
Map<String, List<String>> headers = con.getHeaderFields();
InputStream stream = con.getInputStream();
if (headers.containsKey("icy-metaint")) {
// Headers are sent via HTTP
metaDataOffset = Integer.parseInt(headers.get("icy-metaint").get(0));
} else {
// Headers are sent within a stream
StringBuilder strHeaders = new StringBuilder();
char c;
while ((c = (char)stream.read()) != -1) {
strHeaders.append(c);
if (strHeaders.length() > 5 && (strHeaders.substring((strHeaders.length() - 4), strHeaders.length()).equals("\r\n\r\n"))) {
// end of headers
break;
}
}
// Match headers to get metadata offset within a stream
Pattern p = Pattern.compile("\\r\\n(icy-metaint):\\s*(.*)\\r\\n");
Matcher m = p.matcher(strHeaders.toString());
if (m.find()) {
metaDataOffset = Integer.parseInt(m.group(2));
}
}
// In case no data was sent
if (metaDataOffset == 0) {
isError = true;
return;
}
// Read metadata
int b;
int count = 0;
int metaDataLength = 4080; // 4080 is the max length
boolean inData = false;
StringBuilder metaData = new StringBuilder();
// Stream position should be either at the beginning or right after headers
while ((b = stream.read()) != -1) {
count++;
// Length of the metadata
if (count == metaDataOffset + 1) {
metaDataLength = b * 16;
}
if (count > metaDataOffset + 1 && count < (metaDataOffset + metaDataLength)) {
inData = true;
} else {
inData = false;
}
if (inData) {
if (b != 0) {
metaData.append((char)b);
}
}
if (count > (metaDataOffset + metaDataLength)) {
break;
}
}
// Set the data
metadata = IcyStreamMeta.parseMetadata(metaData.toString());
// Close
stream.close();
}
public boolean isError() {
return isError;
}
public URL getStreamUrl() {
return streamUrl;
}
public void setStreamUrl(URL streamUrl) {
this.metadata = null;
this.streamUrl = streamUrl;
this.isError = false;
}
public static Map<String, String> parseMetadata(String metaString) {
Map<String, String> metadata = new HashMap();
String[] metaParts = metaString.split(";");
Pattern p = Pattern.compile("^([a-zA-Z]+)=\\'([^\\']*)\\'$");
Matcher m;
for (int i = 0; i < metaParts.length; i++) {
m = p.matcher(metaParts[i]);
if (m.find()) {
metadata.put((String)m.group(1), (String)m.group(2));
}
}
return metadata;
}
}
我在MainActivity中使用此方法来获取元数据并更新文本框
private void getMeta()
{
Timer timer = new Timer();
timer.schedule(new TimerTask()
{
public void run()
{
try
{
IcyStreamMeta icy = new IcyStreamMeta(new URL("http://176.28.31.39:8000"));
data = icy.getArtist() + " - " + icy.getTitle();
runOnUiThread(new Runnable()
{
public void run()
{
textbox.setText(data);
}
});
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
},0,5000);
}
对于当前的流标题和艺术家，它的工作效果非常好，但是每首歌曲结束并开始播放新歌曲时，我的应用就会崩溃。为什么会这样？谁能帮我？
编辑：我收到此错误：
09-23 14:57:46.095: E/AndroidRuntime(17321): FATAL EXCEPTION: Timer-0
09-23 14:57:46.095: E/AndroidRuntime(17321): java.lang.StringIndexOutOfBoundsException: length=15; regionStart=0; regionLength=-1
09-23 14:57:46.095: E/AndroidRuntime(17321): at java.lang.String.startEndAndLength(String.java:593)
09-23 14:57:46.095: E/AndroidRuntime(17321): at java.lang.String.substring(String.java:1474)
09-23 14:57:46.095: E/AndroidRuntime(17321): at com.example.alifberadio.IcyStreamMeta.getArtist(IcyStreamMeta.java:38)
09-23 14:57:46.095: E/AndroidRuntime(17321): at com.example.alifberadio.MainActivity$2.run(MainActivity.java:295)
09-23 14:57:46.095: E/AndroidRuntime(17321): at java.util.Timer$TimerImpl.run(Timer.java:284)
它将我重定向到此代码
public String getArtist() throws IOException {
Map<String, String> data = getMetadata();
if (!data.containsKey("StreamTitle"))
return "";
String streamTitle = data.get("StreamTitle");
String title = streamTitle.substring(0, streamTitle.indexOf("-"));
return title.trim();
}
最佳答案
顺便说一句，由于我似乎找不到IcyStreamMeta.java的原始位置，我想我应该发布经过修改的部分，以摆脱那个令人讨厌的正则表达式，如果Artist或Title中包含撇号，则会中断..
public static Map<String, String> parseMetadata(String metaString) {
Map<String, String> metadata = new HashMap();
String[] metaParts = metaString.split(";");
for (int i = 0; i < metaParts.length; i++) {
String part = metaParts[i].substring(0, metaParts[i].indexOf("="));
String songname = metaParts[i].substring(metaParts[i].indexOf("'")+1, metaParts[i].lastIndexOf("'"));
metadata.put(part, songname);
}
return metadata;
}