textview 未更新（android 2.2 中的广播流元数据）

Question

我有一个 IcyStreamMeta.class，它获取了直播流的元数据信息，我使用下面的方法来更新我的主要活动中的 textview 并显示当前正在播放的歌曲标题。下面的代码适用于 android 2.1 和 android 1.5 不知何故它不适用于 android 2.2 我不知道有什么问题我无法弄清楚。我需要你们的帮助:)

这是我的 IcyStreamMeta 类

public class IcyStreamMeta<Message> {

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(m.group(1), m.group(2));
        }
    }

    return metadata;
}   
    }

这是我在我的主要活动中用来在我的文本视图中显示歌曲标题的方法

private void getmeta()
{
    timer = new Timer();
    timer.schedule(new TimerTask() {
    public void run(){

    URL url;
    try{
        url = new URL("http://www.rakista.com:8000/listen.mp3");
        IcyStreamMeta icy = new IcyStreamMeta(url);
        A = icy.getArtist();
        Artist.setText(A);

    }catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }
},0,2000);

    //Log.i("Artist: ", A);
}

更新：

我的主要活动

private class 

public class RakistaRadio extends Activity
{

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
Artist =(TextView) findViewById(R.id.ARTIST);

}
}

Answer 1

这有点晚了，但我一直在寻找与您相同的答案，并进行了一些重构，我让您的代码可以工作。我希望这会有所帮助！

/**
 * Get Meta Data From SHOUTcast
 */
private void getMeta()
{
    Timer timer = new Timer();
    timer.schedule(new TimerTask()
    {
        public void run()
        {
            try
            {
                IcyStreamMeta icy   = new IcyStreamMeta(new URL("http://www.rakista.com:8000"));
                data                = icy.getArtist() + " - " + icy.getTitle();
                meta                = (TextView) findViewById(R.id.meta);

                runOnUiThread(new Runnable()
                {
                     public void run()
                     {
                         meta.setText(data);
                     }
                });
            }
            catch (MalformedURLException e)
            {
                e.printStackTrace();
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
        }
    },0,5000);
}

请注意，变量data 和meta 是在类根中定义的，而不是任何方法。