Question

我通过网址播放音乐效果很好，但是及时获取getDuration只会返回0.

我的代码：

   String AudioURL = link;
            mediaplayer = new MediaPlayer();
            mediaplayer.setAudioStreamType(AudioManager.STREAM_MUSIC);





            try {

                 mediaplayer.setDataSource(AudioURL);
                 mediaplayer.prepare();


                 } catch (IllegalArgumentException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
                 } catch (SecurityException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
                 } catch (IllegalStateException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
                 } catch (IOException e) {
                 // TODO Auto-generated catch block
                 e.printStackTrace();
                 }


                 mediaplayer.start();


                 mediaplayer.setOnPreparedListener(new OnPreparedListener() {
                     @Override
                     public void onPrepared(MediaPlayer mp) {

                         Log.e("error", "total duration: " + mp.getDuration());
                         musica.progre.setProgress(0);
                         Log.e("MusicPP",""+mp.getDuration());
                         musica.progre.setMax(mp.getDuration());

                         Toast toast= Toast.makeText(musica.context, 
                                 "duration: "+mp.getDuration(), Toast.LENGTH_SHORT);  
                                 toast.setGravity(Gravity.TOP|Gravity.CENTER_HORIZONTAL, 0, 0);
                                 toast.show();

                           int duration = buscaMusica.mediaplayer.getDuration();
                           musica.totalTempo.setText(musica.getTimeString(duration));


                     }

                    });

                 mediaplayer.setOnBufferingUpdateListener(new OnBufferingUpdateListener() {

                     @Override
                     public void onBufferingUpdate(MediaPlayer mp, int percent) {
                         musica.progre.setSecondaryProgress(mediaplayer.getCurrentPosition());

                     }
                 });

Answer 1

使用MediaPlayer将网址设置为AsyncTask，如下所示，因此在onPostExecute中，您将使用getDuration方法获取持续时间：

private  class  Load extends AsyncTask<Void , Void , Void>
{

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        helper.show();
    }

    @Override
    protected Void doInBackground(Void... params) {

        try {
            mediaPlayer = MediaPlayer.create(getActivity() , uri);
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        helper.hide();
        seekBar.setProgress(0);
        if (mediaPlayer!=null)
        {
        seekBar.setMax(mediaPlayer.getDuration());
        }
        else{
            getActivity().finish();
            Toast.makeText(getActivity(), "Unable to load Announcement, try again later.",Toast.LENGTH_LONG).show();
        }
        seekBar.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                seekChange(v);
                return false;
            }
        });

    }
}

Android媒体播放器getDuration仅返回0

1 个答案: