【发布时间】：2012-02-16 20:20:17
【问题描述】：
说明：
我有以下音频播放器的代码。我可以通过单击进度条（在 0-to-mediaplayer.getDuration() 之间）从任何持续时间继续播放音频。它非常适合音频播放。
音频流中的问题：
- 当我从 Internet 服务器（例如 s3-bucket）流式传输音频文件时 它开始正确流式传输。
- 但是 mediaPlayer.getDuration() 和 mediaPlayer.getCurrentPosition() 返回错误的值。在流媒体开始时 mediaPlayer.getCurrentPosition() 返回 5 小时。
- 因此，我无法继续从 流的指定持续时间（0 到流持续时间）。
问题：
- 如何获取音频流的持续时间
- 如何从指定的持续时间继续音频流。为了 例如，对于持续时间为 10 分钟的文件，我想从 6 号开始流式传输 分钟。
代码：
public class MyAudioPlayer extends Activity
implements OnClickListener{
MediaPlayer mediaPlayer = null;
private boolean isPaused=false;
private boolean isStop = true;
String filePath = null;
String productName = null;
ImageButton btnPlay = null;
ImageButton btnPause = null;
ImageButton btnReset = null;
ImageButton btnStop = null;
AudioManager audioManager = null;
SeekBar volControl = null;
SeekBar progressControl = null;
TextView progressText = null;
long durationInMillis = -1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.ltd_audio_player);
volControl = (SeekBar)findViewById(R.id.player_volume);
progressControl = (SeekBar)findViewById(R.id.player_seekbar);
progressText = (TextView) findViewById(R.id.player_progress_text);
btnPlay = (ImageButton) findViewById(R.id.ic_player_play);
btnPause = (ImageButton) findViewById(R.id.ic_player_pause);
btnReset = (ImageButton) findViewById(R.id.ic_player_reset);
btnStop = (ImageButton) findViewById(R.id.ic_player_stop);
btnPlay.setOnClickListener(this);
btnPause.setOnClickListener(this);
btnReset.setOnClickListener(this);
btnStop.setOnClickListener(this);
filePath = getIntent().getExtras().getString("localPath");
this.setPlayer();
this.resetAndStartPlayer();
}
@Override
protected void onResume() {
super.onResume();
isPaused=false;
progressText.postDelayed(onEverySecond, 1000);
}
@Override
protected void onPause() {
super.onPause();
isPaused=true;
}
private void setProgressControl() {
int maxVolume = mediaPlayer.getDuration();
int curVolume = mediaPlayer.getCurrentPosition();
progressControl.setMax(maxVolume);
progressControl.setProgress(curVolume);
progressControl.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekbar, int progress, boolean fromUser) {
mediaPlayer.seekTo(progress);
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
});
}
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.ic_player_play:
if(isStop==true){
try {
mediaPlayer.prepareAsync();
} catch (Exception e) {
e.printStackTrace();
}
}else{
mediaPlayer.start();
isStop = true;
}
break;
case R.id.ic_player_pause:
mediaPlayer.pause();
break;
case R.id.ic_player_reset:
mediaPlayer.seekTo(0);
break;
case R.id.ic_player_stop:
isStop = true;
progressControl.setProgress(0);
mediaPlayer.stop();
break;
}
}
private void resetAndStartPlayer(){
try {
if(filePath!=null){
mediaPlayer.setDataSource(filePath);
mediaPlayer.prepareAsync();
}
} catch (Exception e) {
e.printStackTrace();
}
}
private void setPlayer(){
getWindow().setFormat(PixelFormat.UNKNOWN);
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {
@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
progressControl.setSecondaryProgress((progressControl.getMax()/100)*percent);
}
});
mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer.start();
isStop=false;
durationInMillis = mediaPlayer.getDuration();
MyAudioPlayer.this.setProgressControl();
}
});
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
mediaPlayer.release();
super.onDestroy();
}
protected void setProgressText() {
durationInMillis = mediaPlayer.getDuration();
int curVolume = mediaPlayer.getCurrentPosition();
long HOUR = 60*60*1000;
if(progressText!=null){
if(durationInMillis>HOUR){
progressText.setText(String.format("%1$tH:%1$tM:%1$tS", new Date(curVolume))
+" / "+String.format("%1$tH:%1$tM:%1$tS", new Date(durationInMillis)));
}else{
progressText.setText(String.format("%1$tM:%1$tS", new Date(curVolume))
+" / "+String.format("%1$tM:%1$tS", new Date(durationInMillis)));
}
}
}
private Runnable onEverySecond=new Runnable() {
public void run() {
if (mediaPlayer!=null) {
progressControl.setProgress(mediaPlayer.getCurrentPosition());
MyAudioPlayer.this.setProgressText();
}
if (!isPaused) {
progressText.postDelayed(onEverySecond, 1000);
}
}
};
}
时间显示在进度条上方。
时间：“当前持续时间”/“总持续时间”
【问题讨论】：
-
@Arif：我正在创建一个媒体播放器，如果你解决了这个问题，你会把代码发邮件给我吗？ abuhamzah09 at gmail dot com
-
LTDAudioPlayer是什么控件？ -
@AbuHamzah 是 MyAudioPlayer 而不是 LTDAudioPlayer
标签： android audio-streaming android-mediaplayer