Audio Recorder in Android

The android.media.AudioRecord class manages the audio resources for Java applications to record audio from the audio input hardware of the platform.

record.xml:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextView

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="HB-Record Audio" />

    <Button

        android:id="@+id/startrec"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Start Recording" />

    <Button

        android:id="@+id/stoprec"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Stop Recording" />

    <Button

        android:id="@+id/playback"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="Play Back" />

</LinearLayout>

AndroidAudioRecordActivity:

public class AndroidAudioRecordActivity extends Activity

{

      Button startRec, stopRec, playBack;

      Boolean recording;

     

      @Override

      public void onCreate(Bundle savedInstanceState)

      {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.record);

           

            startRec = (Button)findViewById(R.id.startrec);

            stopRec = (Button)findViewById(R.id.stoprec);

            playBack = (Button)findViewById(R.id.playback);

            startRec.setOnClickListener(startRecOnClickListener);

            stopRec.setOnClickListener(stopRecOnClickListener);

            playBack.setOnClickListener(playBackOnClickListener);

      }

      OnClickListener startRecOnClickListener   = new OnClickListener()

      {

            @Override

            public void onClick(View arg0)

            {

                  Thread recordThread = new Thread(new Runnable()

                  {

                        @Override

                        public void run()

                        {

                              recording = true;

                              startRecord();

                        }

                  });

                  recordThread.start();

            }};

            OnClickListener stopRecOnClickListener = new OnClickListener()

            {

                  @Override

                  public void onClick(View arg0)

                  {

                        recording = false;

                  }};

                  OnClickListener playBackOnClickListener   = new OnClickListener()

                  {

                        @Override

                        public void onClick(View v)

                        {

                              playRecord();

                        }

                  };

                  private void startRecord()

                  { 

                        File file = new File(Environment.getExternalStorageDirectory(),"test.pcm");

                        try

                        {

                              file.createNewFile();

                              OutputStream outputStream = new FileOutputStream(file);

                              BufferedOutputStream bufferedOutputStream = newBufferedOutputStream(outputStream);

                              DataOutputStream dataOutputStream = newDataOutputStream(bufferedOutputStream);

                              int minBufferSize = AudioRecord.getMinBufferSize(11025,

                                          AudioFormat.CHANNEL_CONFIGURATION_MONO,

                                          AudioFormat.ENCODING_PCM_16BIT);

                              short[] audioData = new short[minBufferSize];

                              AudioRecord audioRecord = newAudioRecord(MediaRecorder.AudioSource.MIC,

                                          11025,

                                          AudioFormat.CHANNEL_CONFIGURATION_MONO,

                                          AudioFormat.ENCODING_PCM_16BIT,

                                          minBufferSize);

                              audioRecord.startRecording();

                              while(recording)

                              {

                                    int numberOfShort = audioRecord.read(audioData, 0, minBufferSize);

                                    for(int i = 0; i < numberOfShort; i++)

                                    {

                                          dataOutputStream.writeShort(audioData[i]);

                                    }

                              }

                              audioRecord.stop();

                              dataOutputStream.close();

                        }

                        catch (IOException e)

                        {

                              e.printStackTrace();

                        }

                  }

                  void playRecord()

                  {

                        File file = new File(Environment.getExternalStorageDirectory(),"test.pcm");

                        int shortSizeInBytes = Short.SIZE/Byte.SIZE;

                        int bufferSizeInBytes = (int)(file.length()/shortSizeInBytes);

                        short[] audioData = new short[bufferSizeInBytes];

                        try {

                              InputStream inputStream = new FileInputStream(file);

                              BufferedInputStream bufferedInputStream = newBufferedInputStream(inputStream);

                              DataInputStream dataInputStream = newDataInputStream(bufferedInputStream);

                              int i = 0;

                              while(dataInputStream.available() > 0)

                              {

                                    audioData[i] = dataInputStream.readShort();

                                    i++;

                              }

                              dataInputStream.close();

                              AudioTrack audioTrack = new AudioTrack(

                                          AudioManager.STREAM_MUSIC,

                                          11025,

                                          AudioFormat.CHANNEL_CONFIGURATION_MONO,

                                          AudioFormat.ENCODING_PCM_16BIT,

                                          bufferSizeInBytes,

                                          AudioTrack.MODE_STREAM);

                              audioTrack.play();

                              audioTrack.write(audioData, 0, bufferSizeInBytes);

                        } catch (FileNotFoundException e)

                        {

                              e.printStackTrace();

                        } catch (IOException e)

                        {

                              e.printStackTrace();

                        }

                  } 

}

Permission:

  <uses-permission android:name="android.permission.RECORD_AUDIO" />

  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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