我正在尝试开发一个应用程序。这是一个广播应用程序。当我使用一种方法来显示元数据时，它会产生一些问题。 1.播放暂停按钮不能正常工作。 2.花更多时间展示布局。
这是主要的活动代码：
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.ImageButton;
import android.widget.TextView;
public class IRadioActivity extends Activity implements
MediaPlayer.OnCompletionListener, MediaPlayer.OnPreparedListener,
MediaPlayer.OnErrorListener, MediaPlayer.OnBufferingUpdateListener {
private String TAG = getClass().getSimpleName();
private MediaPlayer mp = null;
private ImageButton btnPlay;
String title;
String artist;
private static Context con;
Timer timer;
TextView StationName;
String Stationurl = "http://95.211.82.139:8048";
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
IRadioActivity.con = this;
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
mp = new MediaPlayer();
mp.setOnCompletionListener(this); // Important
btnPlay.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
// check for already playing
if (mp.isPlaying()) {
if (mp != null) {
mp.pause();
// Changing button image to play button
btnPlay.setImageResource(R.drawable.btn_play);
}
} else {
// Resume song
if (mp != null) {
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
}
});
playSong();
getMeta();
}
public void playSong() {
// Play song
try {
mp.reset();
mp.setDataSource(Stationurl);
mp.prepare();
mp.start();
// Displaying Song title
// Changing Button Image to pause image
btnPlay.setImageResource(R.drawable.btn_pause);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public void onDestroy() {
super.onDestroy();
mp.release();
}
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
}
// ----------------
public boolean onError(MediaPlayer mp, int what, int extra) {
StringBuilder sb = new StringBuilder();
sb.append("Media Player Error: ");
switch (what) {
case MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK:
sb.append("Not Valid for Progressive Playback");
break;
case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
sb.append("Server Died");
break;
case MediaPlayer.MEDIA_ERROR_UNKNOWN:
sb.append("Unknown");
break;
default:
sb.append(" Non standard (");
sb.append(what);
sb.append(")");
}
sb.append(" (" + what + ") ");
sb.append(extra);
Log.e(TAG, sb.toString());
return true;
}
public void onBufferingUpdate(MediaPlayer mp, int percent) {
Log.d(TAG, "PlayerService onBufferingUpdate : " + percent + "%");
}
// .....top bar button....//
public void getMeta() {
Timer timer = new Timer();
timer.schedule(new TimerTask() {
public void run() {
URL url;
// Message msg = handler.obtainMessage();
try {
// url = new URL("http://relay5.slayradio.org:8000");
url = new URL(Stationurl);
final IcyStreamMeta icy = new IcyStreamMeta(url);
runOnUiThread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
// Typeface book = Typeface.createFromAsset(
// getAssets(), "fonts/Neutra2Text-Book.otf");
final TextView songTitle = (TextView) findViewById(R.id.songName);
final TextView artistName = (TextView) findViewById(R.id.artistName);
try {
artistName.setText(icy.getArtist().toString()
.trim());
artistName.setText(icy.getArtist().toString()
.trim());
songTitle.setText(icy.getTitle().toString()
.trim());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}, 0, 500);
}
@Override
public void onPrepared(MediaPlayer mp) {
// TODO Auto-generated method stub
}
}
当我使用getMeta（）时遇到这些问题;方法
此方法的主要类别是：
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<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((String)m.group(1), (String)m.group(2));
}
}
return metadata;
}
}
答案 0 :(得分：0)
使用prepareAsync（）而不是prepare（）。请参阅此处的文档：http://developer.android.com/guide/topics/media/mediaplayer.html#preparingasync