audiorecorder录制音频，格式为wav

一.变量声明

private AudioRecord audioRecord = null;
	private static int frequency = 44100;
	private static int channel = AudioFormat.CHANNEL_IN_STEREO;// 设置声道
	private static int encodingBitRate = AudioFormat.ENCODING_PCM_16BIT;// 设置编码
	private static final int recorder_bpp = 16;
	private int recBufSize = 0;
	private int playBufSize = 0;
	private boolean isRecording = false;// 录音标志位
	private String tempFilePath;// 临时文件的路径
	private String saveFilePath;// 保存文件的路径
	private static final String saveFold = "Audio123";// 保存的文件夹名
	private static final String temp_file = "record_temp.raw";// 零时文件名
	private Thread recThread = null;//录音线程

	tempFilePath = SDCardHelp.getFilePath(saveFold) + "/" + temp_file;
		String fileName = DateHelp.getFormateDate(3);
		saveFilePath = SDCardHelp.getFilePath(saveFold) + "/" + fileName
				+ ".wav";

// 开始录音
	private void startRec() {
		recBufSize = AudioRecord.getMinBufferSize(frequency, channel,
				encodingBitRate);
		audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency,
				channel, encodingBitRate, recBufSize);
		audioRecord.startRecording();
		isRecording = true;
		recThread = new Thread(new Runnable() {
			public void run() {
				writeAudioDataToFile();
			}
		}, "AudioRecorder Thread");
		recThread.start();
	}

	// 将音频数据写入文件
	private void writeAudioDataToFile() {
		byte data[] = new byte[recBufSize];
		FileOutputStream os = null;
		try {
			os = new FileOutputStream(tempFilePath);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		int read = 0;
		if (null != os) {
			while (isRecording) {
				read = audioRecord.read(data, 0, recBufSize);
				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 stopRecording() {
		if (null != audioRecord) {
			isRecording = false;
			audioRecord.stop();
			audioRecord.release();
			audioRecord = null;
			recThread = null;
		}
		String fileName = DateHelp.getFormateDate(3);
		saveFilePath = SDCardHelp.getFilePath(saveFold) + "/" + fileName
				+ ".wav";
		copyWaveFile(tempFilePath, saveFilePath);
		deleteTempFile();
	}

	// 删除临时文件
	private void deleteTempFile() {
		File file = new File(tempFilePath);
		file.delete();
	}

	private void copyWaveFile(String inFilename, String outFilename) {
		FileInputStream in = null;
		FileOutputStream out = null;
		long totalAudioLen = 0;
		long totalDataLen = totalAudioLen + 36;
		long longSampleRate = frequency;
		int channels = 2;
		long byteRate = recorder_bpp * frequency * channels / 8;

		byte[] data = new byte[recBufSize];

		try {
			in = new FileInputStream(inFilename);
			out = new FileOutputStream(outFilename);
			totalAudioLen = in.getChannel().size();
			totalDataLen = totalAudioLen + 36;
			WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
					longSampleRate, channels, byteRate);

			while (in.read(data) != -1) {
				out.write(data);
			}

			in.close();
			out.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	private void WriteWaveFileHeader(FileOutputStream out, long totalAudioLen,
			long totalDataLen, long longSampleRate, int channels, long byteRate)
			throws IOException {

		byte[] header = new byte[44];

		header[0] = 'R'; // RIFF/WAVE header
		header[1] = 'I';
		header[2] = 'F';
		header[3] = 'F';
		header[4] = (byte) (totalDataLen & 0xff);
		header[5] = (byte) ((totalDataLen >> 8) & 0xff);
		header[6] = (byte) ((totalDataLen >> 16) & 0xff);
		header[7] = (byte) ((totalDataLen >> 24) & 0xff);
		header[8] = 'W';
		header[9] = 'A';
		header[10] = 'V';
		header[11] = 'E';
		header[12] = 'f'; // 'fmt ' chunk
		header[13] = 'm';
		header[14] = 't';
		header[15] = ' ';
		header[16] = 16; // 4 bytes: size of 'fmt ' chunk
		header[17] = 0;
		header[18] = 0;
		header[19] = 0;
		header[20] = 1; // format = 1
		header[21] = 0;
		header[22] = (byte) channels;
		header[23] = 0;
		header[24] = (byte) (longSampleRate & 0xff);
		header[25] = (byte) ((longSampleRate >> 8) & 0xff);
		header[26] = (byte) ((longSampleRate >> 16) & 0xff);
		header[27] = (byte) ((longSampleRate >> 24) & 0xff);
		header[28] = (byte) (byteRate & 0xff);
		header[29] = (byte) ((byteRate >> 8) & 0xff);
		header[30] = (byte) ((byteRate >> 16) & 0xff);
		header[31] = (byte) ((byteRate >> 24) & 0xff);
		header[32] = (byte) (2 * 16 / 8); // block align
		header[33] = 0;
		header[34] = recorder_bpp; // bits per sample
		header[35] = 0;
		header[36] = 'd';
		header[37] = 'a';
		header[38] = 't';
		header[39] = 'a';
		header[40] = (byte) (totalAudioLen & 0xff);
		header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
		header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
		header[43] = (byte) ((totalAudioLen >> 24) & 0xff);

		out.write(header, 0, 44);
	}