Question

I use the following code to record audio files and play. I have a resume function which starts recording again. The audio files are stored in sdcard. My problem is, the files get stored in the sdcard but the file alone play. I need to play all the recorded files one after another. Give suggestions. I am running out of time…

ReadSDData.java

package com.fsp.audio;

import java.io.File;
import java.util.ArrayList;

import android.os.Environment;
import android.util.Log;

public class ReadSDDatas {
    public String filePath()
    {
        String newFolderName="/MyAudio";
        String extstoredir=Environment.getExternalStorageDirectory().toString();
        String newPath=extstoredir+newFolderName;
        return newPath;
    }

    public String getCombineFile()
    {
        String newFolderName="/MyComAudio";
        String extstoredir=Environment.getExternalStorageDirectory().toString();
        String path=extstoredir+newFolderName;
        File myNewPath=new File(path);
        if(!myNewPath.exists())
        {
            myNewPath.mkdir();
        }
        String audname="ComAudio";
        String ext=".3gp";
        File audio=new File(myNewPath,audname+ext);             

        if(audio.exists())
        {
            audio.delete();
        }
        String audpath=path+"/"+audname+ext;
        Log.d("Combined audio file",audpath);
        return audpath;
    }

    public ArrayList<String> getFileNames()
    {
        ArrayList<String> names=new ArrayList<String>();
        names.clear();
        String path=filePath();
        File f=new File(path);
        if(f.isDirectory())
        {
            File[] files=f.listFiles();
            for(int i=0;i<files.length;i++)
            {
                System.out.println("File Name======>>>"+files[i].getName());
                names.add(files[i].getName().toString().trim());
            }
        }
        return names;
    }

    public ArvrayList<String> getFullAudioPath()
    {
        ArrayList<String> fullPath=new ArrayList<String>();
        fullPath.clear();

        String path=filePath();
        File f=new File(path);
        if(f.isDirectory())
        {
            File[] files=f.listFiles();
            for(int i=0;i<files.length;i++)
            {
                String fpath=path+File.separator+files[i].getName().toString().trim();
                System.out.println("File Full Path======>>>"+fpath);
                fullPath.add(fpath);
            }
        }       
        return fullPath;
    }
}

AudioResume1.java

package com.fsp.audio;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;

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;

public class AudioResume1 extends Activity {
    ArrayList<String> audNames=new ArrayList<String>();
    ArrayList<String> audFullPath=new ArrayList<String>();
    byte fileContent[];

    Button record=null;
    Button stoprec=null;
    Button play=null;

    public MediaPlayer player=null;
    public MediaRecorder recorder=null;

    int cou=0;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        record=(Button)findViewById(R.id.recBtn);
        stoprec=(Button)findViewById(R.id.stopBtn);
        play=(Button)findViewById(R.id.playBtn);

        record.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v)
            {
                // TODO Auto-generated method stub
                System.out.println("********** Stated Recording **********");
                recorder=new MediaRecorder();
                recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

                String path=audioFilePath();
                System.out.println("Recording Path===========>>>"+path);
                recorder.setOutputFile(path);
                recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                try 
                {
                    recorder.prepare();
                    recorder.start();
                }
                catch (IllegalStateException e) 
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } 
                catch (IOException e) 
                {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });

        stoprec.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) 
            {
                // TODO Auto-generated method stub
                System.out.println("********** Stoped Recording **********");
                recorder.stop();
                recorder.release();
                recorder=null;

            }
        });

        play.setOnClickListener(new OnClickListener(){
            @Override
            public void onClick(View v) 
            {
                // TODO Auto-generated method stub
                getAudioNames();                
                readAudioAsStream();
            }
        });
    }

    public void readAudioAsStream()
    {
        getAudioPath();
        File f;
        FileInputStream ins = null;
        ReadSDDatas rds=new ReadSDDatas();
        try 
        {
            String comfile=rds.getCombineFile();
            //FileOutputStream fos=new FileOutputStream(comfile);
            Log.d("combined file",comfile);
            File file=new File(comfile);
            RandomAccessFile raf = new RandomAccessFile(file, "rw");
            Log.d("path size",Integer.toString(audFullPath.size()));
            for(int i=0;i<audFullPath.size();i++)
            {   
                String filepath=audFullPath.get(i);
                Log.d("Filepath",filepath);
                f=new File(audFullPath.get(i));
                 fileContent = new byte[(int)f.length()];
                ins=new FileInputStream(audFullPath.get(i));
                int numofbytes=ins.read(fileContent);
                System.out.println("Number Of Bytes Read===========>>>"+numofbytes);
                raf.seek(file.length());
                raf.write(fileContent);
            }
        }
        catch (FileNotFoundException e1)
        {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        playAudio();
        /*for(int i=0;i<audFullPath.size();i++)
        {
            Log.d("fullpathsize",Integer.toString(audFullPath.size()));
            playAudio(audFullPath.get(i));
        }*/

    }

    public void playAudio()
    {
        //Log.d("value of path",path);
        /*String newFolderName="/MyComAudio";
        String extstoredir=Environment.getExternalStorageDirectory().toString();
        String filename="ComAudio.3gp";
        String path1=extstoredir+newFolderName+filename;
        Log.d("path1",path1);*/
        String path="/sdcard/MyComAudio/ComAudio.3gp";
        player= new MediaPlayer();
        try
        {
            player.setDataSource(path);
            player.prepare();
            player.start();
        } 
        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();
        }
    }

    public void getAudioPath()
    {
        ReadSDDatas rds=new ReadSDDatas();
        audFullPath=rds.getFullAudioPath();
    }

    public void getAudioNames()
    {
        ReadSDDatas rds=new ReadSDDatas();
        audNames=rds.getFileNames();
    }

    public String audioFilePath()
    {           
        String newFolderName="/MyAudio";
        String extstoredir=Environment.getExternalStorageDirectory().toString();
        String path=extstoredir+newFolderName;
        File myNewPath=new File(path);
        if(!myNewPath.exists())
        {
            myNewPath.mkdir();
        }
        cou++;
        String audname="RecAudio";
        String ext=".3gp";
        File audio=new File(myNewPath,audname+Integer.toString(cou)+ext);               

        if(audio.exists())
        {
            audio.delete();
        }
        String audpath=path+File.separator+audname+Integer.toString(cou)+ext;

        return audpath;
    }
}

Answer 1

You can use MediaPlayer.onCompletionListener to listen to the event when a track ends, so that you can play the next one

UPDATE

player.setDataSource(path);
player.prepare();
player.setOnCompletionListener(new OnCompletionListener() {

        @Override
        public void onCompletion(MediaPlayer player) {
            player.stop();

            // play next audio file

        }

    });
player.start();

UPDATE 2

Your code in the comment won’t work, this could be a solution:

int i = 0;
//somewhere in your activity you start playing your first file
playAudio("/sdcard/MyAudio/RecAudio"+i+".3gp");

public void playAudio(path) {
    player.setDataSource(path);
    player.prepare();
    player.setOnCompletionListener(new OnCompletionListener() {
        @Override public void onCompletion(MediaPlayer mp) {
            player.stop();
            if(i < numberOfFiles) {
                i++;
                playAudio("/sdcard/MyAudio/RecAudio"+i+".3gp");
            } else i = 0;
        }
    });
    player.start();
}