Android Open Source - sensor-supervisor Audio Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.thirdi.sensorsupervisor;
/* w w w .j  av a  2  s.  com*/
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Fragment;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Spinner;
//TODO: Needs cleanup, a way to control rates etc.
public class AudioFragment extends Fragment {

protected static int RECORDER_SAMPLERATE = 8000 ;
    private static final int RECORDER_CHANNELS = AudioFormat.CHANNEL_IN_MONO;
    private static final int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
    private AudioRecord recorder = null;
    private Thread recordingThread = null;
    private boolean isRecording = false;
    
    public AudioFragment() {
        // Required empty public constructor
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        

    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this sensorFragment

        return inflater.inflate(R.layout.fragment_audio, container, false);

    }
    @Override
    public void onStart() {
        super.onStart();
        
        setButtonHandlers();
        enableButtons(false);
        int bufferSize = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);

    }

    private void setButtonHandlers() {
        ((Button)getView().findViewById(R.id.btnStart)).setOnClickListener(btnClick);
        ((Button)getView().findViewById(R.id.btnStop)).setOnClickListener(btnClick);
    }
    private void enableButton(int id, boolean isEnable) {
        ((Button)getView().findViewById(id)).setEnabled(isEnable);
    }

    private void enableButtons(boolean isRecording) {
        enableButton(R.id.btnStart, !isRecording);
        enableButton(R.id.btnStop, isRecording);
    }
    // want to play 2048 (2K) since 2 bytes we use only 1024
    int BufferElements2Rec = 1024;
    // 2 bytes (16bit) format
    int BytesPerElement = 2;

    private void startRecording() {

        recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,RECORDER_SAMPLERATE, RECORDER_CHANNELS,
                RECORDER_AUDIO_ENCODING, BufferElements2Rec * BytesPerElement);
        recorder.startRecording();
        isRecording = true;
        recordingThread = new Thread(new Runnable() {
            public void run() {writeAudioDataToFile();
            }
        }, "AudioRecorder Thread");
        recordingThread.start();
    }

    //convert short to byte
    private byte[] short2byte(short[] sData) {
        int shortArrsize = sData.length;
        byte[] bytes = new byte[shortArrsize * 2];
        for (int i = 0; i < shortArrsize; i++) {
            bytes[i * 2] = (byte) (sData[i] & 0x00FF);
            bytes[(i * 2) + 1] = (byte) (sData[i] >> 8);
            sData[i] = 0;
        }
        return bytes;

    }

    private void writeAudioDataToFile() {
        // Write the output audio in name
     //String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
     String filePath = Environment.getExternalStorageDirectory().getPath()+ "/record.3gp";
        short sData[] = new short[BufferElements2Rec];
        FileOutputStream os = null;
        try {
            os = new FileOutputStream(filePath);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        while (isRecording) {
            // gets the voice output from microphone to byte format

            recorder.read(sData, 0, BufferElements2Rec);
            System.out.println("Short wirting to file" + sData.toString());
            try {
                // // writes the data to file from buffer
                // // stores the voice buffer
                byte bData[] = short2byte(sData);
                os.write(bData, 0, BufferElements2Rec * BytesPerElement);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try {
            os.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private void stopRecording() {
        // stops the recording activity
        if (null != recorder) {
            isRecording = false;
            recorder.stop();
            recorder.release();
            recorder = null;
            recordingThread = null;
        }
    }
    //start and stop button listener
    private View.OnClickListener btnClick = new View.OnClickListener() {
        public void onClick(View v) {
          int id = v.getId();
          if (id == R.id.btnStart) {
            enableButtons(true);
                startRecording();
          } else if (id == R.id.btnStop) {
             enableButtons(false);
                 stopRecording();
          }
            /*switch (v.getId()) {
                case R.id.btnStart: {
                    enableButtons(true);
                    startRecording();
                    break;
                }
                case R.id.btnStop: {
                    enableButtons(false);
                    stopRecording();
                    break;
                }
            }*/
        }
    };
}

Java Source Code List

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