android 合并录音文件

/**
* @param audio files list
*/
public void getInputCollection(List list) {
long dateTaken = System.currentTimeMillis();
String strTempFile = Long.toString(dateTaken);
mRecordAudioFile = new File(mPath, strTempFile + ".amr");

FileOutputStream fileOutputStream = null;

if (!mRecordAudioFile.exists()) {
try {
mRecordAudioFile.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
try {
fileOutputStream = new FileOutputStream(mRecordAudioFile);

} catch (IOException e) {
e.printStackTrace();
}

for (int i = 0; i < list.size(); i++) {
File tempfile = new File((String) list.get(i));
try {
FileInputStream fileInputStream = new FileInputStream(tempfile);
byte[] myByte = new byte[fileInputStream.available()];
// file length
int length = myByte.length;

// first audio file
if (i == 0) {
while (fileInputStream.read(myByte) != -1) {
fileOutputStream.write(myByte, 0, length);
}
}

// delete file head information
else {
while (fileInputStream.read(myByte) != -1) {

fileOutputStream.write(myByte, 6, length - 6);
}
}

fileOutputStream.flush();
fileInputStream.close();
} catch (Exception e) {
e.printStackTrace();
}

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

}

合并之前设置MediaRecorder的输出格式和encoder一定要指定对，否则合并后的录音文件有问题

mMediaRecorder = new MediaRecorder();
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

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