package com.sharpandroid.music;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.TextView;
public class StreamingMediaPlayer {
private static final int INTIAL_KB_BUFFER = 96*10/8;//assume 96kbps*10secs/8bits per byte
private ImageButton playButton;
private SeekBar progressBar;
private TextView playTime;
private long mediaLengthInKb, mediaLengthInSeconds;
private int totalKbRead = 0;
//用于更新主界面
private final Handler handler = new Handler()
{
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
}
};
private MediaPlayer mediaPlayer;
private File downloadingMediaFile;
private boolean isInterrupted;
private Context context;
private int counter = 0;
public StreamingMediaPlayer(Context context, ImageButton playButton, Button streamButton, SeekBar progressBar,TextView playTime)
{
this.context = context;
this.playButton = playButton;
this.playTime=playTime; //播放的进度时刻
this.progressBar = progressBar;
}
/**
* 开启一个线程,下载数据
*/
public void startStreaming(final String mediaUrl, long mediaLengthInKb, long mediaLengthInSeconds) throws IOException {
this.mediaLengthInKb = mediaLengthInKb;
this.mediaLengthInSeconds = mediaLengthInSeconds;
Runnable r = new Runnable() {
public void run() {
try {
downloadAudioIncrement(mediaUrl);
} catch (IOException e) {
Log.e(getClass().getName(), "Unable to initialize the MediaPlayer for fileUrl=" + mediaUrl, e);
return;
}
}
};
new Thread(r).start();
}
//根据获得的URL地址下载数据
public void downloadAudioIncrement(String mediaUrl) throws IOException {
URLConnection cn = new URL(mediaUrl).openConnection();
cn.connect();
InputStream stream = cn.getInputStream();
if (stream == null) {
Log.e(getClass().getName(), "Unable to create InputStream for mediaUrl:" + mediaUrl);
}
downloadingMediaFile = new File(context.getCacheDir(),"downloadingMedia.dat");
if (downloadingMediaFile.exists()) {
downloadingMediaFile.delete(); //如果下载完成则删除
}
FileOutputStream out = new FileOutputStream(downloadingMediaFile);
byte buf[] = new byte[16384];
int totalBytesRead = 0, incrementalBytesRead = 0;
do {
int numread = stream.read(buf);
if (numread <= 0)
break;
out.write(buf, 0, numread);
totalBytesRead += numread;
incrementalBytesRead += numread;
totalKbRead = totalBytesRead/1000; //totalKbRead表示已经下载的文件大小
testMediaBuffer();
fireDataLoadUpdate();
} while (validateNotInterrupted());
stream.close();
if (validateNotInterrupted()) {
fireDataFullyLoaded();
}
}
private boolean validateNotInterrupted() {
if (isInterrupted) {
if (mediaPlayer != null) {
mediaPlayer.pause();
}
return false;
} else {
return true;
}
}
//测试缓冲的文件大小是否大于INTIAL_KB_BUFFER,如果大于的话就播放
private void testMediaBuffer() {
Runnable updater = new Runnable() {
public void run() {
if (mediaPlayer == null) {
if ( totalKbRead >= INTIAL_KB_BUFFER) {
try {
startMediaPlayer();
} catch (Exception e) {
Log.e(getClass().getName(), "Error copying buffered conent.", e);
}
}
} else if ( mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000 ){
transferBufferToMediaPlayer();
}
}
};
handler.post(updater);
}
private void startMediaPlayer() {
try {
File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".dat");
moveFile(downloadingMediaFile,bufferedFile);
Log.e(getClass().getName(),"Buffered File path: " + bufferedFile.getAbsolutePath());
Log.e(getClass().getName(),"Buffered File length: " + bufferedFile.length()+"");
mediaPlayer = createMediaPlayer(bufferedFile);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayer.start();
startPlayProgressUpdater();
playButton.setEnabled(true);
} catch (IOException e) {
Log.e(getClass().getName(), "Error initializing the MediaPlayer.", e);
}
}
private MediaPlayer createMediaPlayer(File mediaFile)
throws IOException {
MediaPlayer mPlayer = new MediaPlayer();
mPlayer.setOnErrorListener(
new MediaPlayer.OnErrorListener() {
public boolean onError(MediaPlayer mp, int what, int extra) {
Log.e(getClass().getName(), "Error in MediaPlayer: (" + what +") with extra (" +extra +")" );
return false;
}
});
FileInputStream fis = new FileInputStream(mediaFile);
mPlayer.setDataSource(fis.getFD());//此方法返回与流相关联的文件说明符。
mPlayer.prepare();
return mPlayer;
}
private void transferBufferToMediaPlayer() {
try {
boolean wasPlaying = mediaPlayer.isPlaying();
int curPosition = mediaPlayer.getCurrentPosition();
File oldBufferedFile = new File(context.getCacheDir(),"playingMedia" + counter + ".dat");
File bufferedFile = new File(context.getCacheDir(),"playingMedia" + (counter++) + ".dat");
bufferedFile.deleteOnExit();
moveFile(downloadingMediaFile,bufferedFile);
mediaPlayer.pause();
mediaPlayer = createMediaPlayer(bufferedFile);
mediaPlayer.seekTo(curPosition);
boolean atEndOfFile = mediaPlayer.getDuration() - mediaPlayer.getCurrentPosition() <= 1000;
if (wasPlaying || atEndOfFile){
mediaPlayer.start();
}
oldBufferedFile.delete();
}catch (Exception e) {
Log.e(getClass().getName(), "Error updating to newly loaded content.", e);
}
}
private void fireDataLoadUpdate() {
Runnable updater = new Runnable() {
public void run() {
// textStreamed.setText((totalKbRead + " Kb"));
float loadProgress = ((float)totalKbRead/(float)mediaLengthInKb);
progressBar.setSecondaryProgress((int)(loadProgress*100));
}
};
handler.post(updater);
}
private void fireDataFullyLoaded() {
Runnable updater = new Runnable() {
public void run() {
transferBufferToMediaPlayer();
downloadingMediaFile.delete();
}
};
handler.post(updater);
}
public MediaPlayer getMediaPlayer() {
return mediaPlayer;
}
public void startPlayProgressUpdater() {
float progress = (((float)mediaPlayer.getCurrentPosition()/1000)/mediaLengthInSeconds);
progressBar.setProgress((int)(progress*100));
int pos=mediaPlayer.getCurrentPosition();
int min = (pos/1000)/60;
int sec = (pos/1000)%60;
if(sec<10)
playTime.setText(""+min+":0"+sec);//把音乐播放的进度,转换成时间
else
playTime.setText(""+min+":"+sec);
if (mediaPlayer.isPlaying()) {
Runnable notification = new Runnable() {
public void run() {
startPlayProgressUpdater();
}
};
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