在您的应用程序中尝试此代码…
private int RECORDER_CHANNELS = AudioFormat.CHANNEL_CONFIGURATION_MONO;private int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;private int RECORDER_SAMPLERATE = 44100;private byte RECORDER_BPP = (byte) 16;private AudioRecord audioRecorder;public void arm() { // Get the minimum buffer size required for the successful creation of an AudioRecord object. int bufferSizeInBytes = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING); // Initialize Audio Recorder. audioRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLERATE, RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSizeInBytes); // Start Recording. audioRecorder.startRecording(); int numberOfReadBytes = 0; byte audioBuffer[] = new byte[bufferSizeInBytes]; boolean recording = false; float tempFloatBuffer[] = new float[3]; int tempIndex = 0; int totalReadBytes = 0; byte totalByteBuffer[] = new byte[60 * 44100 * 2]; // While data come from microphone. while (true) { float totalAbsValue = 0.0f; short sample = 0; numberOfReadBytes = audioRecorder.read(audioBuffer, 0, bufferSizeInBytes); // Analyze Sound. for (int i = 0; i < bufferSizeInBytes; i += 2) { sample = (short) ((audioBuffer[i]) | audioBuffer[i + 1] << 8); totalAbsValue += Math.abs(sample) / (numberOfReadBytes / 2); } // Analyze temp buffer. tempFloatBuffer[tempIndex % 3] = totalAbsValue; float temp = 0.0f; for (int i = 0; i < 3; ++i) temp += tempFloatBuffer[i]; if ((temp >= 0 && temp <= 350) && recording == false) { Log.i("TAG", "1"); tempIndex++; continue; } if (temp > 350 && recording == false) { Log.i("TAG", "2"); recording = true; } if ((temp >= 0 && temp <= 350) && recording == true) { Log.i("TAG", "Save audio to file."); // Save audio to file. String filepath = Environment.getExternalStorageDirectory().getPath(); File file = new File(filepath, "AudioRecorder"); if (!file.exists()) file.mkdirs(); String fn = file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".wav"; long totalAudioLen = 0; long totalDataLen = totalAudioLen + 36; long longSampleRate = RECORDER_SAMPLERATE; int channels = 1; long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8; totalAudioLen = totalReadBytes; totalDataLen = totalAudioLen + 36; byte finalBuffer[] = new byte[totalReadBytes + 44]; finalBuffer[0] = 'R'; // RIFF/WAVE header finalBuffer[1] = 'I'; finalBuffer[2] = 'F'; finalBuffer[3] = 'F'; finalBuffer[4] = (byte) (totalDataLen & 0xff); finalBuffer[5] = (byte) ((totalDataLen >> 8) & 0xff); finalBuffer[6] = (byte) ((totalDataLen >> 16) & 0xff); finalBuffer[7] = (byte) ((totalDataLen >> 24) & 0xff); finalBuffer[8] = 'W'; finalBuffer[9] = 'A'; finalBuffer[10] = 'V'; finalBuffer[11] = 'E'; finalBuffer[12] = 'f'; // 'fmt ' chunk finalBuffer[13] = 'm'; finalBuffer[14] = 't'; finalBuffer[15] = ' '; finalBuffer[16] = 16; // 4 bytes: size of 'fmt ' chunk finalBuffer[17] = 0; finalBuffer[18] = 0; finalBuffer[19] = 0; finalBuffer[20] = 1; // format = 1 finalBuffer[21] = 0; finalBuffer[22] = (byte) channels; finalBuffer[23] = 0; finalBuffer[24] = (byte) (longSampleRate & 0xff); finalBuffer[25] = (byte) ((longSampleRate >> 8) & 0xff); finalBuffer[26] = (byte) ((longSampleRate >> 16) & 0xff); finalBuffer[27] = (byte) ((longSampleRate >> 24) & 0xff); finalBuffer[28] = (byte) (byteRate & 0xff); finalBuffer[29] = (byte) ((byteRate >> 8) & 0xff); finalBuffer[30] = (byte) ((byteRate >> 16) & 0xff); finalBuffer[31] = (byte) ((byteRate >> 24) & 0xff); finalBuffer[32] = (byte) (2 * 16 / 8); // block align finalBuffer[33] = 0; finalBuffer[34] = RECORDER_BPP; // bits per sample finalBuffer[35] = 0; finalBuffer[36] = 'd'; finalBuffer[37] = 'a'; finalBuffer[38] = 't'; finalBuffer[39] = 'a'; finalBuffer[40] = (byte) (totalAudioLen & 0xff); finalBuffer[41] = (byte) ((totalAudioLen >> 8) & 0xff); finalBuffer[42] = (byte) ((totalAudioLen >> 16) & 0xff); finalBuffer[43] = (byte) ((totalAudioLen >> 24) & 0xff); for (int i = 0; i < totalReadBytes; ++i) finalBuffer[44 + i] = totalByteBuffer[i]; FileOutputStream out; try { out = new FileOutputStream(fn); try { out.write(finalBuffer); out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (FileNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } // */ tempIndex++; break; } // -> Recording sound here. Log.i("TAG", "Recording Sound."); for (int i = 0; i < numberOfReadBytes; i++) totalByteBuffer[totalReadBytes + i] = audioBuffer[i]; totalReadBytes += numberOfReadBytes; // */ tempIndex++; }}有关更多详细信息，您还可以查看此演示…
http://musicg.googlepre.com/files/musicg_android_demo.zip
