搜索栏没有更新正在播放的音乐，但搜索栏保持空闲状态

Question

我正在从网址播放mp3文件，但SeekBar在播放歌曲时没有更新。

它显示缓冲，但在歌曲开始时不会自动移动。

当我试图强行移动时，它也可以正常工作。

下面我用来播放和更新 SeekBar 的代码。

我想创建一个跟踪媒体播放器进度的 seekBar，但它效果不佳，音乐正在播放，但搜索栏保持空闲状态。有什么我遗漏的吗？

请帮助我，我是安卓新手。

public class XYZ extends Fragment implements MediaPlayer.OnBufferingUpdateListener,MediaPlayer.OnCompletionListener{
private SeekBar seekBar;
private MediaPlayer mediaPlayer;
private int mediaFileLength;
final Handler handler = new Handler();
private int realtimeLength;
Button b,b3,b4;
private double startTime = 0;
private double finalTime = 0;
public static int oneTimeOnly = 0;
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_outside, container,
            false);
    rootView.setBackgroundResource(R.drawable.jotirling);
    seekBar = rootView.findViewById(R.id.seekbar);
    seekBar.setMax(99); // 100% (0~99)
    seekBar.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (mediaPlayer.isPlaying()) {
                SeekBar seekBar = (SeekBar) v;
                int playPosition = (mediaFileLength / 100) * seekBar.getProgress();
                mediaPlayer.seekTo(playPosition);
            }
            return false;
        }
    });

    b3.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            final ProgressDialog mDialog = new ProgressDialog(getActivity());

            @SuppressLint("StaticFieldLeak") AsyncTask<String, String, String> mp3Play = new AsyncTask<String, String, String>() {
                @Override
                protected void onPreExecute() {
                    mDialog.setMessage("Please wait It will take time according to your network speed...!");
                    mDialog.show();
                    mDialog.setCancelable(false);
                }
                @Override
                protected String doInBackground(String... params) {
                    try {
                        mediaPlayer.setDataSource(params[0]);
                        mediaPlayer.prepare();
                    } catch (Exception ignored) {
                    }
                    return "";
                }
                @Override
                protected void onPostExecute(String s) {
                    mediaFileLength = mediaPlayer.getDuration();
                    realtimeLength = mediaFileLength;
                    if (!mediaPlayer.isPlaying()) {
                        p=1;
                        mediaPlayer.start();
                        Toast.makeText(getActivity(), "Playing sound", Toast.LENGTH_SHORT).show();
                        finalTime = mediaPlayer.getDuration();
                        startTime = mediaPlayer.getCurrentPosition();
                        b3.setBackgroundResource(R.drawable.pp);
                        if (oneTimeOnly == 0) {
                            oneTimeOnly = 1;
                        }
                    } else {
                        p=0;
                        mediaPlayer.pause();
                        Toast.makeText(getActivity(), "Pausing "+
                                "sound",Toast.LENGTH_SHORT).show();
                        b3.setBackgroundResource(R.drawable.p);
                    }
                    updateSeekBar();
                    mDialog.dismiss();
                }
            };
            mp3Play.execute("URL"); // direct link mp3 file
        }
    });
    mediaPlayer = new MediaPlayer();
    mediaPlayer.setOnBufferingUpdateListener(this);
    mediaPlayer.setOnCompletionListener(this);

    return rootView;
}
private void updateSeekBar() {
    seekBar.setProgress((int) (((float) mediaPlayer.getCurrentPosition() / mediaFileLength) * 100));
    if (mediaPlayer.isPlaying()) {
        Runnable updater = new Runnable() {
            @Override
            public void run() {
                updateSeekBar();

            }
        };
    }
}
@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
    seekBar.setSecondaryProgress(percent);
}
}

Answer 1

你应该考虑使用setOnSeekbarChangeListener()

参考 ： setOnSeekBarChangeListener（）

简单的例子是

seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {       
    @Override       
    public void onStopTrackingTouch(SeekBar seekBar) {      
        // TODO Auto-generated method stub      
    }       
    @Override       
    public void onStartTrackingTouch(SeekBar seekBar) {     
        // TODO Auto-generated method stub      
    }       
    @Override       
    public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {     
        // TODO Auto-generated method stub      
        if(fromUser){
          //do your things, like updating time durations etc.
        }
    }       
});  

另外，如果您想要工作示例，请查看此链接以获取代码（我刚刚使用了 circularSeekbar 而不是常规代码）https://github.com/iamSahdeep/Bop/blob/master/app/src/main/java/com/sahdeepsingh/Bop/Activities/PlayerView.java#L324

更多例子 ： https://www.javatips.net/api/android.widget.seekbar.onseekbarchangelistener

Answer 2

您可以为此创建使用计时器：

seekBar.setMax(mediaPlayer.getDuration());
    new Timer().scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            seekBar.setProgress(mediaPlayer.getCurrentPosition());
        }
    },0,1000);

Answer 3

您正在定义Runnable updater但不调用它。

if (mediaPlayer.isPlaying()) {
    Runnable updater = new Runnable() {
        @Override
        public void run() {
            updateSeekBar();

        }
    };
    seekBar.post(updater)
}