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在我的应用程序中，我正在尝试实现 SeekBar。第一次播放声音时，SeekBar 工作正常。但是当我单击按钮再次播放声音时，我会陷入关于MediaPlayer的无休止的错误循环。我想要的是，当我在播放声音时，如果我点击播放按钮，声音应该从头开始播放，SeekBar 也应该从头开始。如果我删除了 SeekBar，那么一切正常。但是 SeekBar 在我的应用程序中是必须的。我已经在 BaseAdapter 中实现了所有这些东西。我必须在 BaseAdapter 中做所有的事情。所以请帮助我让我使用BaseAdapter的代码..

这是我的代码...请看一下...

mediaPlayer.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                Toast.makeText(activity, "Loading Message", Toast.LENGTH_LONG).show();

                mp.reset();
                try {
                    mp.setDataSource("url for any mp3 audio file");
                } catch (IllegalArgumentException 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();
                }
                mp.prepareAsync();
                mp.setOnPreparedListener(new OnPreparedListener() {

                    public void onPrepared(final MediaPlayer mp) {
                        // TODO Auto-generated method stub
                        mp.start();
                        mediaPlayer.setBackgroundResource(R.drawable.m_pause);
                        seekBar.setProgress(0);
                        seekBar.setMax(100);
                        mUpdateTimeTask = new Thread(new Runnable() {

                            public void run() {
                                // TODO Auto-generated method stub
                                try {
                                    Thread.sleep(100);
                                } catch (InterruptedException e) {
                                    // TODO Auto-generated catch block
                                    e.printStackTrace();
                                }
                                long totalDuration = mp.getDuration();
                                   long currentDuration = mp.getCurrentPosition();
                                   int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
                                   seekBar.setProgress(progress);
                                   mHandler.post(this);
                            }
                        });
                        mUpdateTimeTask.start();
                    }
                });
            }
        });
        mp.setOnCompletionListener(new OnCompletionListener() {

            public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
                mediaPlayer.setBackgroundResource(R.drawable.m_play);
                mp.stop();
                try {
                    mUpdateTimeTask.join();
                    mHandler.sendEmptyMessage(0);
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                mHandler.removeCallbacks(mUpdateTimeTask);
            }
        });
        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            public void onStopTrackingTouch(final SeekBar seekBar) {
                // TODO Auto-generated method stub
                //mHandler.removeCallbacks(mUpdateTimeTask);
                if(mp.isPlaying())
                {
                    int totalDuration = mp.getDuration();
                    int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
                    mp.seekTo(currentPosition);
                    mUpdateTimeTask = new Thread(new Runnable() {

                        public void run() {
                            // TODO Auto-generated method stub
                            try {
                                Thread.sleep(100);
                            } catch (InterruptedException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                            long totalDuration = mp.getDuration();
                               long currentDuration = mp.getCurrentPosition();
                               int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
                               //timer.setText(""+utils.milliSecondsToTimer(currentDuration));
                               seekBar.setProgress(progress);
                               mHandler.post(this);
                        }
                    });
                    mUpdateTimeTask.start();
                }
                else
                {
                    seekBar.setProgress(0);
                }
            }

            public void onStartTrackingTouch(SeekBar seekBar) {
                // TODO Auto-generated method stub
                if(mp.isPlaying())
                {
                    mHandler.removeCallbacks(mUpdateTimeTask);
                }
                else
                {
                    seekBar.setProgress(0);
                }
            }

            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
                // TODO Auto-generated method stub

            }
        });
        mp.setOnErrorListener(new OnErrorListener() {

            public boolean onError(MediaPlayer mp, int what, int extra) {
                // TODO Auto-generated method stub
                return false;
            }
        });

谢谢...

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1 回答 1

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在 BaseAdapter 中创建一个方法，将当前 seekbarprogress 设置为零

void setSeekBarValuetoZero(){  
    seekBar.setProgress(0);
}

请检查 seekbar 初始化的初始位置。您可以在 mp.reset(); 之前从 yourMediaPlayer 类调用此函数；

于 2012-10-17T16:25:17.463 回答