SO ANswer - AudioRecord Issue

package com.example.soquestion;

import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.media.MediaRecorder.AudioSource;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.os.Build;

public class MainActivity extends ActionBarActivity {

	protected static final String TAG = "SO_QUESTION";

	private int BufferSize;
	byte[] buffer = new byte[BufferSize];

	private AudioRecord recorder = null;
	private AudioTrack track = null;

	private int sampleRate = 8000;
	private int channelConfig = AudioFormat.CHANNEL_IN_MONO;
	private int audioFormat = AudioFormat.ENCODING_PCM_16BIT;

	private boolean isRecording = true;
	private Thread recordingThread = null;

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


		setContentView(R.layout.activity_main);

		setButtonHandlers();

		enableButton(R.id.btnStartRec,true);
		enableButton(R.id.btnStopRec,false);

		enableButton(R.id.btnStartPlay,false);
		enableButton(R.id.btnStopPlay,false);


		BufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioFormat);
		/*if (savedInstanceState == null) {
			getSupportFragmentManager().beginTransaction()
			.add(R.id.container, new PlaceholderFragment()).commit();
		}*/
	}

	private void writeAudioDataToFile()
	{
		byte data[] = new byte[BufferSize];
		String filename = "/sdcard/audiofile.raw";
		FileOutputStream os = null;

		try {
			os = new FileOutputStream(filename);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		int read = 0;

		if(null != os){
			while(isRecording)
			{
				read = recorder.read(data, 0, BufferSize);

				if(AudioRecord.ERROR_INVALID_OPERATION != read){
					try {
						os.write(data);
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}

			try {
				os.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}

	private void startRecording()
	{
		recorder = new AudioRecord(AudioSource.DEFAULT, 8000, channelConfig, audioFormat, BufferSize);
		if(1 == recorder.getState())
			recorder.startRecording();

		isRecording = true;
		recordingThread = new Thread(new Runnable() {
			@Override
			public void run() {
				writeAudioDataToFile();
			}
		},"AudioRecorder Thread");
		recordingThread.start();
	}

	private void stopRecording(){
		if(null != recorder){
			isRecording = false;

			int i = recorder.getState();
			if(i==1)
				recorder.stop();
			recorder.release();
			Log.d(TAG, "===== Recording Audio Completed ===== ");

			recorder = null;
			recordingThread = null;
		}
	}

	public void StartPlaying()
	{
		int minBufferSize = AudioTrack.getMinBufferSize(8000,
				AudioFormat.CHANNEL_OUT_MONO,
				AudioFormat.ENCODING_PCM_16BIT);		/* Return 640 */


		int bufferSize = minBufferSize;
		AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 8000, AudioFormat.CHANNEL_OUT_MONO,
				AudioFormat.ENCODING_PCM_16BIT, bufferSize, AudioTrack.MODE_STREAM);

		int i = 0;
		byte[] temp = new byte[bufferSize];
		try {
			FileInputStream fin = new FileInputStream("/sdcard/audiofile.raw");
			Log.d(TAG, "===== opening file : /sdcard/audiofile.raw ===== ");

			DataInputStream dis = new DataInputStream(fin);

			at.play();
			while((i = dis.read(temp, 0, bufferSize)) > -1)
			{
				at.write(temp, 0, i);
			}

			Log.d(TAG, "===== Playing Audio Completed ===== ");
			at.stop();
			at.release();
			dis.close();
			fin.close();

		} catch (FileNotFoundException e) {
			// TODO
			e.printStackTrace();
		} catch (IOException e) {
			// TODO
			e.printStackTrace();
		}
	}


	private View.OnClickListener btnClick = new View.OnClickListener() {
		@Override
		public void onClick(View v) {
			switch(v.getId()){
			case R.id.btnStartRec:{
				Log.d(TAG, "Start Recording");
				enableButton(R.id.btnStartRec,false);
				enableButton(R.id.btnStopRec,true);
				startRecording();
				enableButton(R.id.btnStopPlay,false);
				break;
			}
			case R.id.btnStopRec:{
				Log.d(TAG, "Stop Recording");
				enableButton(R.id.btnStartRec,true);
				enableButton(R.id.btnStopRec,false);
				stopRecording();
				enableButton(R.id.btnStartPlay,true);
				break;
			}
			case R.id.btnStartPlay:{
				Log.d(TAG, "Play Recording");
				enableButton(R.id.btnStartRec,false);
				enableButton(R.id.btnStopRec,false);
				StartPlaying();
				enableButton(R.id.btnStartPlay,false);
				enableButton(R.id.btnStopPlay,true);
				break;
			}

			case R.id.btnStopPlay:{
				Log.d(TAG, "Stop Playing");
				//StopPlaying();
				enableButton(R.id.btnStartPlay,true);
				enableButton(R.id.btnStopPlay,false);
				enableButton(R.id.btnStartRec,true);
				break;
			}
			}
		}
	};

	/* Assign OnClickListener to Buttons */
	private void setButtonHandlers() {
		((Button)findViewById(R.id.btnStartRec)).setOnClickListener(btnClick);
		((Button)findViewById(R.id.btnStopRec)).setOnClickListener(btnClick);
		((Button)findViewById(R.id.btnStartPlay)).setOnClickListener(btnClick);
		((Button)findViewById(R.id.btnStopPlay)).setOnClickListener(btnClick);
	}

	/* Function to Enable/Disable Buttons */
	private void enableButton(int id,boolean isEnable){
		((Button)findViewById(id)).setEnabled(isEnable);
	}



	/*private String getTempFilename(){
		String filepath = Environment.getExternalStorageDirectory().getPath();
		File file = new File(filepath,AUDIO_RECORDER_FOLDER);

		if(!file.exists()){
			file.mkdirs();
		}

		File tempFile = new File(filepath,AUDIO_RECORDER_TEMP_FILE);

		//if(tempFile.exists())
		//	tempFile.delete();

		raw_filename = file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE;
		Log.d(TAG, "================= Temp File Name : "+file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE+"=================");
		return (file.getAbsolutePath() + "/" + AUDIO_RECORDER_TEMP_FILE);
	}
*/
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// Handle action bar item clicks here. The action bar will
		// automatically handle clicks on the Home/Up button, so long
		// as you specify a parent activity in AndroidManifest.xml.
		int id = item.getItemId();
		if (id == R.id.action_settings) {
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

	/**
	 * A placeholder fragment containing a simple view.
	 */
	public static class PlaceholderFragment extends Fragment {

		public PlaceholderFragment() {
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			View rootView = inflater.inflate(R.layout.fragment_main, container,
					false);
			return rootView;
		}
	}

}