SeekBar and media player in android

Question

I have a simple player and recorder. Everything works great but have a one problem. I want to add seek bar to see progress in playing record and use this seek bar to set place from player should play. I have onProgress but with no effect. This is code:

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      } } 

Any ideas how use seek bar to see progress and set place from record should play?

Answer 1

To create a 'connection' between SeekBar and MediaPlayer you need first to get your current recording max duration and set it to your seek bar.

mSeekBar.setMax(mFileDuration/1000); // where mFileDuration is mMediaPlayer.getDuration(); 

After you initialise your MediaPlayer and for example press play button, you should create handler and post runnable so you can update your SeekBar (in the UI thread itself) with the current position of your MediaPlayer like this :

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);     } }); 

and update that value every second.

If you need to update the MediaPlayer's position while user drag your SeekBar you should add OnSeekBarChangeListener to your SeekBar and do it there :

        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);                 }             }     }); 

And that should do the trick! : )

EDIT: One thing which I've noticed in your code, don't do :

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

make all initialisations in your onCreate(); , do not create constructors of your Activity.

Answer 2

I've used this tutorial with success, it's really simple to understand: www.androidhive.info/2012/03/android-building-audio-player-tutorial/

This is the interesting part:

/**  * 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(); }