Android中的SeekBar和媒体播放器

时间：2013-06-18 11:55:34

标签： android android-mediaplayer android-seekbar

我有一个简单的播放器和录音机。一切都很好，但有一个问题。我想添加搜索栏以查看播放记录的进度，并使用此搜索栏来设置播放器应该播放的位置。我有onProgress但没有效果。这是代码：

package com.example.recorder;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

public class MainActivity extends Activity implements OnSeekBarChangeListener
{
    private static final String LOG_TAG = "AudioRecordTest";
    private static String mFileName = null;
    private SeekBar seekBar;
    private MediaRecorder mRecorder = null;
    private Button startRecord, startPlaying, stopPlaying;
    private MediaPlayer   mPlayer = null;

    private void onRecord(boolean start) {
        if (start) {
            startRecording();
        } else {
            stopRecording();
        }
    }



    private void startPlaying() {
        if(mPlayer != null && mPlayer.isPlaying()){
            mPlayer.pause();
        } else if(mPlayer != null){
            mPlayer.start();
        }else{
        mPlayer = new MediaPlayer();
        try {

            mPlayer.setDataSource(mFileName);
            mPlayer.prepare();
            mPlayer.start();

        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }
        }

    }

    private void stopPlaying() {
        mPlayer.release();
        mPlayer = null;
        startPlaying.setText("Start playing");
    }

    private void pausePlaying(){
        if(mPlayer.isPlaying()){
            mPlayer.pause();
        } else {
          mPlayer.start();
        }
    }

    private void startRecording() {
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(mFileName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }

        mRecorder.start();
    }

    private void stopRecording() {
        mRecorder.stop();
        mRecorder.release();
        mRecorder = null;
    }



    public MainActivity() {
        mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
        mFileName += "/audiorecordtest.3gp";
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        setContentView(R.layout.activity_main);

        startPlaying = (Button) findViewById(R.id.buttonStartPlay);
        stopPlaying = (Button) findViewById(R.id.buttonStopPlaying);
        startRecord = (Button) findViewById(R.id.buttonStartRecord);
        seekBar = (SeekBar) findViewById(R.id.seekBar);

        startRecord.setOnClickListener(new OnClickListener() {
            boolean mStartRecording = true;
            @Override
            public void onClick(View v) {
                onRecord(mStartRecording);
                if (mStartRecording) {
                    startRecord.setText("Stop recording");
                } else {
                    startRecord.setText("Start recording");
                }
                mStartRecording = !mStartRecording;

            }
        });  


        startPlaying.setOnClickListener(new OnClickListener() {
            boolean mStartPlaying = true;
            @Override
            public void onClick(View v) {
                //onPlay(mStartPlaying);
                startPlaying();
                if (mStartPlaying) {
                    startPlaying.setText("Stop playing");
                } else {
                    startPlaying.setText("Start playing");
                }
                mStartPlaying = !mStartPlaying;
            }
        });

        stopPlaying.setOnClickListener(new OnClickListener() {
            boolean mStartPlaying = true;
            @Override
            public void onClick(View v) {
                 stopPlaying();

            }
        });


    }

    @Override
    public void onPause() {
        super.onPause();
        if (mRecorder != null) {
            mRecorder.release();
            mRecorder = null;
        }

        if (mPlayer != null) {
            mPlayer.release();
            mPlayer = null;
        }
    }



    @Override
    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        if(fromUser){
            mPlayer.seekTo(progress); 
            seekBar.setProgress(progress);
            }
            else{
             // the event was fired from code and you shouldn't call player.seekTo()
            }

    }



    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }



    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }
}

任何想法如何使用搜索栏来查看进度并从记录中设置位置应该起作用？

13 个答案:

答案 0 :(得分：132)

要在SeekBar和MediaPlayer之间创建“连接”，首先需要获取当前录制的最长持续时间并将其设置为搜索栏。

mSeekBar.setMax(mFileDuration); // where mFileDuration is mMediaPlayer.getDuration();

初始化MediaPlayer后，例如按播放按钮，您应该创建处理程序并发布runnable，以便您可以使用当前位置更新SeekBar（在UI thread本身中）您的MediaPlayer是这样的：

private Handler mHandler = new Handler();
//Make sure you update Seekbar on UI thread
MainActivity.this.runOnUiThread(new Runnable() {

    @Override
    public void run() {
        if(mMediaPlayer != null){
            int mCurrentPosition = mMediaPlayer.getCurrentPosition() / 1000;
            mSeekBar.setProgress(mCurrentPosition);
        }
        mHandler.postDelayed(this, 1000);
    }
});

并每秒更新一次该值。

如果您需要在用户拖动MediaPlayer时更新SeekBar的位置，则应将OnSeekBarChangeListener添加到SeekBar并在那里执行：

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {                
                if(mMediaPlayer != null && fromUser){
                    mMediaPlayer.seekTo(progress * 1000);
                }
            }
    });

这应该可以解决问题！ ：）

修改 我在你的代码中注意到的一件事，不要这样做：

public MainActivity() {
    mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
    mFileName += "/audiorecordtest.3gp";
}

在onCreate();中进行所有初始化，不要创建Activity的构造函数。

答案 1 :(得分：8)

我已成功使用本教程，理解起来非常简单： www.androidhive.info/2012/03/android-building-audio-player-tutorial/

这是有趣的部分：

/**
 * Update timer on seekbar
 * */
public void updateProgressBar() {
    mHandler.postDelayed(mUpdateTimeTask, 100);
}  

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

           // Displaying Total Duration time
           songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
           // Displaying time completed playing
           songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));

           // Updating progress bar
           int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
           //Log.d("Progress", ""+progress);
           songProgressBar.setProgress(progress);

           // Running this thread after 100 milliseconds
           mHandler.postDelayed(this, 100);
       }
    };

/**
 *
 * */
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {

}

/**
 * When user starts moving the progress handler
 * */
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
    // remove message Handler from updating progress bar
    mHandler.removeCallbacks(mUpdateTimeTask);
}

/**
 * When user stops moving the progress hanlder
 * */
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
    mHandler.removeCallbacks(mUpdateTimeTask);
    int totalDuration = mp.getDuration();
    int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);

    // forward or backward to certain seconds
    mp.seekTo(currentPosition);

    // update timer progress again
    updateProgressBar();
}

答案 2 :(得分：2)

初始化MediaPlayer和SeekBar后，您可以执行以下操作：

 Timer timer = new Timer();
    timer.scheduleAtFixedRate(new TimerTask() {
        @Override
        public void run() {
            mSeekBar.setProgress(mMediaPlayer.getCurrentPosition());
        }
    },0,1000);

每秒更新SeekBar（1000毫秒）

要更新MediaPlayer，如果用户拖动SeekBar，您必须将OnSeekBarChangeListener添加到SeekBar：

mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        @Override
        public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
            mMediaPlayer.seekTo(i);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });

快乐的编码!!!

答案 3 :(得分：1)

检查一下，您应该在msecs中提供参数，不要只发送progress到seekTo(int)

并检查此getCurrentPostion()和getDuration()。

您可以进行一些计算，例如，以progress为单位转换msce = (progress/100)*getDuration()，然后执行seekTo(msec)

或者我有一个简单的想法，一旦你的媒体播放器准备就绪，你不需要改变任何其他代码只需添加seekBar.setMax(mPlayer.getDuration())。

这里的链接正是您想要的seek bar update

答案 4 :(得分：1)

    int  pos  = 0;
    yourSeekBar.setMax(mPlayer.getDuration());

开始MediaPlayer之后，即mplayer.start()

试试此代码

while(mPlayer!=null){
         try {
                Thread.sleep(1000);
                pos  = mPlayer.getCurrentPosition();
            }  catch (Exception e) {
                //show exception in LogCat
            }
            yourSeekBar.setProgress(pos);

   }

在您添加此代码之前，您必须为xml创建SeekBar资源，并在Activity类onCreate()方法中使用它。

答案 5 :(得分：1)

以下代码对我有用。

我为seekbar创建了一个方法

@Override
public void onPrepared(MediaPlayer mediaPlayer) {
    mp.start();
     getDurationTimer();
    getSeekBarStatus();


}
//Creating duration time method
public void getDurationTimer(){
    final long minutes=(mSongDuration/1000)/60;
    final int seconds= (int) ((mSongDuration/1000)%60);
    SongMaxLength.setText(minutes+ ":"+seconds);


}



 //creating a method for seekBar progress
public void getSeekBarStatus(){

    new Thread(new Runnable() {

        @Override
        public void run() {
            // mp is your MediaPlayer
            // progress is your ProgressBar

            int currentPosition = 0;
            int total = mp.getDuration();
            seekBar.setMax(total);
            while (mp != null && currentPosition < total) {
                try {
                    Thread.sleep(1000);
                    currentPosition = mp.getCurrentPosition();
                } catch (InterruptedException e) {
                    return;
                }
                seekBar.setProgress(currentPosition);

            }
        }
    }).start();





    seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
        int progress=0;

        @Override
        public void onProgressChanged(final SeekBar seekBar, int ProgressValue, boolean fromUser) {
            if (fromUser) {
                mp.seekTo(ProgressValue);//if user drags the seekbar, it gets the position and updates in textView.
            }
            final long mMinutes=(ProgressValue/1000)/60;//converting into minutes
            final int mSeconds=((ProgressValue/1000)%60);//converting into seconds
            SongProgress.setText(mMinutes+":"+mSeconds);
        }

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) {

        }

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) {

        }
    });
}

SongProgress和SongMaxLength是用于显示歌曲持续时间和歌曲长度的TextView。

答案 6 :(得分：1)

科特林代码：

var updateSongTime = object : Runnable {
            override fun run() {
                val getCurrent = mediaPlayer?.currentPosition
                startTimeText?.setText(String.format("%d:%d",
                        TimeUnit.MILLISECONDS.toMinutes(getCurrent?.toLong() as Long),
                        TimeUnit.MILLISECONDS.toSeconds(getCurrent?.toLong()) -
                                TimeUnit.MINUTES.toSeconds(
                                        TimeUnit.MILLISECONDS.toMinutes(getCurrent?.toLong()))))
                seekBar?.setProgress(getCurrent?.toInt() as Int)
                Handler().postDelayed(this, 1000)
            }
        }

用于每秒更改媒体播放器音频文件

如果用户拖动搜索栏，则可以使用以下代码段

Statified.seekBar?.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar, i: Int, b: Boolean) {
                if(b && Statified.mediaPlayer != null){
                    Statified.mediaPlayer?.seekTo(i)
                }

            }
            override fun onStartTrackingTouch(seekBar: SeekBar) {}
            override fun onStopTrackingTouch(seekBar: SeekBar) {}
        })

答案 7 :(得分：1)

给出一个对我有用的答案hardartcore，但有一个小的更改，但在更改之前不起作用：

private Handler mHandler = new Handler();
MusicPlayer.this.runOnUiThread(new Runnable() {
     @Override
     public void run() {
          if(player != null){
               int mCurrentPosition = player.getCurrentPosition();//clear ' /1000 '
               seekBar.setProgress(mCurrentPosition);
          }
          mHandler.postDelayed(this, 1000);
      }
});



seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
          if(player != null && fromUser){
              player.seekTo(progress); // clear ' * 1000  '
          }
     }
});

答案 8 :(得分：1)

我的代码片段：

public class PlayerActivity extends AppCompatActivity {

private static final String TAG = "PlayerActivity";
private ActivityPlayerBinding binding;
private MediaPlayer mediaPlayer;
private boolean playingAudio = false;
Runnable runnable;
Handler handler;


 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    binding = ActivityPlayerBinding.inflate(getLayoutInflater());
    setContentView(binding.getRoot());

        mediaPlayer = new MediaPlayer();
    mediaPlayer.setAudioAttributes(
            new AudioAttributes.Builder()
                    .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
                    .setUsage(AudioAttributes.USAGE_MEDIA)
                    .build()
    );

    try {
        mediaPlayer.setDataSource(songUrl);
        mediaPlayer.prepareAsync();
    } catch (IOException e) {
        e.printStackTrace();
    }

    mediaPlayer.setOnPreparedListener(mp -> {
        binding.playBtn.setBackground(getDrawable(R.drawable.ic_pause));
        binding.seekbarPlayer.setMax(mp.getDuration());
        mediaPlayer.start();
        playingAudio = true;
        updateSeekbar();
    });

    mediaPlayer.setOnBufferingUpdateListener((mp, percent) -> {
        double ratio = percent / 100.0;
        int bufferingLevel = (int) (mp.getDuration() * ratio);
        binding.seekbarPlayer.setSecondaryProgress(bufferingLevel);
    });

    binding.seekbarPlayer.setOnSeekBarChangeListener(seekBarChangeListener);

}

    private SeekBar.OnSeekBarChangeListener seekBarChangeListener = new SeekBar.OnSeekBarChangeListener() {
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        if (fromUser) {
            mediaPlayer.seekTo(progress);
            seekBar.setProgress(progress);
        }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {

    }
};
    private void updateSeekbar() {
    try {
        if (mediaPlayer != null) {
            int currentPos = mediaPlayer.getCurrentPosition();
            binding.seekbarPlayer.setProgress(currentPos);
            runnable = this::updateSeekbar;
            handler.postDelayed(runnable, 1000);
        }
    } catch (Exception e) {
        e.printStackTrace();
        Log.d(TAG, "updateSeekbar: " + e.getMessage());
    }  
  }
}

答案 9 :(得分：0)

添加@ hardartcore的回答。

  1. 不是在Handler上调用postDelayed，最好的方法是在播放期间从MediaPlayer获取回调，然后根据进度更新seekBar。

  2. 此外，暂停MediaPlayer onStartTrackingTouch(SeekBar seekBar) OnSeekBarChangeListener，然后在onStopTrackingTouch(SeekBar seekBar)重新启动。

答案 10 :(得分：0)

这对我有用：

apples.propertyIwantToChange = apples.propertyIwantToChange == 'green' ? 'red' : 'green'

答案 11 :(得分：0)

根据之前的陈述，为了获得更好的性能，您还可以添加if条件

if (player.isPlaying() {
    handler.postDelayed(..., 1000);
}

答案 12 :(得分：0)

试用此代码：

public class MainActivity extends AppCompatActivity {

MediaPlayer mplayer;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

            //You create MediaPlayer variable ==> set the path and start the audio.

    mplayer = MediaPlayer.create(this, R.raw.example);
    mplayer.start();

            //Find the seek bar by Id (which you have to create in layout)
            // Set seekBar max with length of audio
           // You need a Timer variable to set progress with position of audio

    final SeekBar seekBar = (SeekBar) findViewById(R.id.seekBar);
    seekBar.setMax(mplayer.getDuration());

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


            seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                @Override
                public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            // Update the progress depending on seek bar
                    mplayer.seekTo(progress);

                }

                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {

                }

                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {

                }
            });
        }
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