媒体播放器进度更新到seekbar不顺畅？

Question

我正在使用带录音机和播放器的应用程序.我正在使用mediaplayer播放录制的.wav文件,同时我想更新到搜索栏.一切都工作正常但我的问题是媒体播放器进度更新到seekbar没有顺利发生,如果我们playig一个小文件,搜索栏的拇指在几秒钟或之间跳跃.

任何人都可以帮助我解决方法,使其顺利寻求seekbar的进展.我的代码如下所示.我被困在这里.

    mediaPlayerIntiate();
    mediaPlayerSetSource();
    mMediaPlayer.start();
    task = new TimerTask() {
                @Override
                public void run() {
                    Graphbar.post(new Runnable() {
                        @Override
                        public void run() {

                            if (mMediaPlayer != null) {

                                if (playButtonState == MediaMode.PLAY) {
                                    if (mMediaPlayer.isPlaying()) {
                                        Graphbar.setProgress(mMediaPlayer
                                                .getCurrentPosition());
                                        mediaPlayerUpdateTimer(mMediaPlayer
                                                .getCurrentPosition());
                                        enableRewindandForward();
                                    }
                                }

                            }

                        }
                    });
                }
            };
            timer = new Timer();
            timer.schedule(task, 0, 8);

Answer 1

mMediaPlayer.getCurrentPosition()以毫秒为单位返回当前时间,并将此更新为Seekbar,最大容量为100.将一个公式设置为文件长度为100.尝试此函数

    MediaPlayer mMediaPlayer = new MediaPlayer();
    final SeekBar mSeelBar = new SeekBar(this);
    final int duration = mMediaPlayer.getDuration();
    final int amoungToupdate = duration / 100;
    Timer mTimer = new Timer();
    mTimer.schedule(new TimerTask() {

        @Override
        public void run() {
            runOnUiThread(new Runnable() {

                @Override
                public void run() {
                    if (!(amoungToupdate * mSeelBar.getProgress() >= duration)) {
                        int p = mSeelBar.getProgress();
                        p += 1;
                        mSeelBar.setProgress(p);
                    }
                }
            });
        };
    }, amoungToupdate);

当媒体播放器开始播放时应该调用此过程.内

mediaPlayer.setOnPreparedListener(new OnPreparedListener(){

    @Override
    public void onPrepared(MediaPlayer mp) {
    **// call here**
});

更新

在几秒钟内更新125次不是你应该做的事情.请增加更新SeekBar的间隔.我在阅读NullPointer的评论后添加了这个

Answer 2

seekbar.setProgress() 只接受 int。因此，我们大多数人倾向于将经过的百分比传递给这种方法。但是，如果您需要更平滑的进程，那么您可以使用以毫秒为单位的持续时间作为 MAX。然后我们每毫秒更新一次搜索栏的进度。下面是一个示例，我每 15 毫秒更新一次，因为几乎每部 android 手机的刷新率都是 60 fps（每秒帧数）。

    try{
        mediaPlayer.start();
        seekbar.setProgress(0);
        seekbar.setMax(mediaPlayer.getDuration());

        // Updating progress bar
        seekHandler.postDelayed(updateSeekBar, 15);
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    }

/**
 * Background Runnable thread
 * */
private Runnable updateSeekBar = new Runnable() {
    public void run() {
        long totalDuration = mediaPlayer.getDuration();
        long currentDuration = mediaPlayer.getCurrentPosition();

        // Displaying Total Duration time
        remaining.setText(""+ milliSecondsToTimer(totalDuration-currentDuration));
        // Displaying time completed playing
        elapsed.setText(""+ milliSecondsToTimer(currentDuration));

        // Updating progress bar
        seekbar.setProgress((int)currentDuration);

        // Call this thread again after 15 milliseconds => ~ 1000/60fps
        seekHandler.postDelayed(this, 15);
    }
};

/**
 * Function to convert milliseconds time to
 * Timer Format
 * Hours:Minutes:Seconds
 * */
public String milliSecondsToTimer(long milliseconds){
    String finalTimerString = "";
    String secondsString = "";

    // Convert total duration into time
    int hours = (int)( milliseconds / (1000*60*60));
    int minutes = (int)(milliseconds % (1000*60*60)) / (1000*60);
    int seconds = (int) ((milliseconds % (1000*60*60)) % (1000*60) / 1000);
    // Add hours if there
    if(hours > 0){
        finalTimerString = hours + ":";
    }

    // Prepending 0 to seconds if it is one digit
    if(seconds < 10) {
        secondsString = "0" + seconds;
    }else {
        secondsString = "" + seconds;
    }

    finalTimerString = finalTimerString + minutes + ":" + secondsString;

    // return timer string
    return finalTimerString;
}