Android中怎么利用AudioRecord实现暂停录音功能，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
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项目
设计的思路：
由于自带的AudioRecord没有pauseRecord()方法，我把开始录音-->（暂停/继续录音）...-->停止录音叫做一次录音，点击一次暂停就会产生一个文件(.pcm)，将一次录音产生的所有文件名(.pcm)用一个list装起来，点击停止后将遍历list取得所有文件路径进行拼接。
由于考虑到以后可能要进行语音识别，所以对程序的灵活性和拓展性都做了相应的处理，可以通过setListener()监听录音的音频流和监听录音结束。
采用线程池对线程进行管理，减少系统开销。
对类的说明：
AudioRecorder：封装了录音的方法：创建录音对象、开始、暂停、停止、取消，使用静态枚举类Status来记录录音的状态。
FileUtils：文件工具类，用于文件路径的获取
PcmToWav：封装了将.pcm文件转化.wav文件的方法
WaveHeader：wav文件头
RecordStreamListener：监听录音音频流，用于拓展业务的处理
接下来是关键代码部分：
1、AudioRecorder类：
package com.hxl.pauserecord.record;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.text.TextUtils;
import android.util.Log;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Created by HXL on 16/8/11.
* 用于实现录音 暂停录音
*/
public class AudioRecorder {
//音频输入-麦克风
private final static int AUDIO_INPUT = MediaRecorder.AudioSource.MIC;
//采用频率
//44100是目前的标准，但是某些设备仍然支持22050，16000，11025
//采样频率一般共分为22.05KHz、44.1KHz、48KHz三个等级
private final static int AUDIO_SAMPLE_RATE = 16000;
//声道 单声道
private final static int AUDIO_CHANNEL = AudioFormat.CHANNEL_IN_MONO;
//编码
private final static int AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
// 缓冲区字节大小
private int bufferSizeInBytes = 0;
//录音对象
private AudioRecord audioRecord;
//录音状态
private Status status = Status.STATUS_NO_READY;
//文件名
private String fileName;
//录音文件
private List filesName = new ArrayList<>();
//线程池
private ExecutorService mExecutorService;
//录音监听
private RecordStreamListener listener;
public AudioRecorder() {
mExecutorService = Executors.newCachedThreadPool();
}
/**
* 创建录音对象
*/
public void createAudio(String fileName, int audioSource, int sampleRateInHz, int channelConfig, int audioFormat) {
// 获得缓冲区字节大小
bufferSizeInBytes = AudioRecord.getMinBufferSize(sampleRateInHz,
channelConfig, channelConfig);
audioRecord = new AudioRecord(audioSource, sampleRateInHz, channelConfig, audioFormat, bufferSizeInBytes);
this.fileName = fileName;
}
/**
* 创建默认的录音对象
*
* @param fileName 文件名
*/
public void createDefaultAudio(String fileName) {
// 获得缓冲区字节大小
bufferSizeInBytes = AudioRecord.getMinBufferSize(AUDIO_SAMPLE_RATE,
AUDIO_CHANNEL, AUDIO_ENCODING);
audioRecord = new AudioRecord(AUDIO_INPUT, AUDIO_SAMPLE_RATE, AUDIO_CHANNEL, AUDIO_ENCODING, bufferSizeInBytes);
this.fileName = fileName;
status = Status.STATUS_READY;
}
/**
* 开始录音
*
*/
public void startRecord() {
if (status == Status.STATUS_NO_READY||audioRecord==null) {
throw new IllegalStateException("录音尚未初始化,请检查是否禁止了录音权限~");
}
if (status == Status.STATUS_START) {
throw new IllegalStateException("正在录音");
}
Log.d("AudioRecorder", "===startRecord===" + audioRecord.getState());
audioRecord.startRecording();
String currentFileName = fileName;
if (status == Status.STATUS_PAUSE) {
//假如是暂停录音 将文件名后面加个数字,防止重名文件内容被覆盖
currentFileName += filesName.size();
}
filesName.add(currentFileName);
final String finalFileName=currentFileName;
//将录音状态设置成正在录音状态
status = Status.STATUS_START;
//使用线程池管理线程
mExecutorService.execute(new Runnable() {
@Override
public void run() {
writeDataTOFile(finalFileName);
}
});
}
/**
* 暂停录音
*/
public void pauseRecord() {
Log.d("AudioRecorder", "===pauseRecord===");
if (status != Status.STATUS_START) {
throw new IllegalStateException("没有在录音");
} else {
audioRecord.stop();
status = Status.STATUS_PAUSE;
}
}
/**
* 停止录音
*/
public void stopRecord() {
Log.d("AudioRecorder", "===stopRecord===");
if (status == Status.STATUS_NO_READY || status == Status.STATUS_READY) {
throw new IllegalStateException("录音尚未开始");
} else {
audioRecord.stop();
status = Status.STATUS_STOP;
release();
}
}
/**
* 释放资源
*/
public void release() {
Log.d("AudioRecorder", "===release===");
//假如有暂停录音
try {
if (filesName.size() > 0) {
List filePaths = new ArrayList<>();
for (String fileName : filesName) {
filePaths.add(FileUtils.getPcmFileAbsolutePath(fileName));
}
//清除
filesName.clear();
//将多个pcm文件转化为wav文件
mergePCMFilesToWAVFile(filePaths);
} else {
//这里由于只要录音过filesName.size都会大于0,没录音时fileName为null
//会报空指针 NullPointerException
// 将单个pcm文件转化为wav文件
//Log.d("AudioRecorder", "=====makePCMFileToWAVFile======");
//makePCMFileToWAVFile();
}
} catch (IllegalStateException e) {
throw new IllegalStateException(e.getMessage());
}
if (audioRecord != null) {
audioRecord.release();
audioRecord = null;
}
status = Status.STATUS_NO_READY;
}
/**
* 取消录音
*/
public void canel() {
filesName.clear();
fileName = null;
if (audioRecord != null) {
audioRecord.release();
audioRecord = null;
}
status = Status.STATUS_NO_READY;
}
/**
* 将音频信息写入文件
*
*/
private void writeDataTOFile(String currentFileName) {
// new一个byte数组用来存一些字节数据，大小为缓冲区大小
byte[] audiodata = new byte[bufferSizeInBytes];
FileOutputStream fos = null;
int readsize = 0;
try {
File file = new File(FileUtils.getPcmFileAbsolutePath(currentFileName));
if (file.exists()) {
file.delete();
}
fos = new FileOutputStream(file);// 建立一个可存取字节的文件
} catch (IllegalStateException e) {
Log.e("AudioRecorder", e.getMessage());
throw new IllegalStateException(e.getMessage());
} catch (FileNotFoundException e) {
Log.e("AudioRecorder", e.getMessage());
}
while (status == Status.STATUS_START) {
readsize = audioRecord.read(audiodata, 0, bufferSizeInBytes);
if (AudioRecord.ERROR_INVALID_OPERATION != readsize && fos != null) {
try {
fos.write(audiodata);
if (listener != null) {
//用于拓展业务
listener.onRecording(audiodata, 0, audiodata.length);
}
} catch (IOException e) {
Log.e("AudioRecorder", e.getMessage());
}
}
}
if (listener != null) {
listener.finishRecord();
}
try {
if (fos != null) {
fos.close();// 关闭写入流
}
} catch (IOException e) {
Log.e("AudioRecorder", e.getMessage());
}
}
/**
* 将pcm合并成wav
*
* @param filePaths
*/
private void mergePCMFilesToWAVFile(final List filePaths) {
mExecutorService.execute(new Runnable() {
@Override
public void run() {
if (PcmToWav.mergePCMFilesToWAVFile(filePaths, FileUtils.getWavFileAbsolutePath(fileName))) {
//操作成功
} else {
//操作失败
Log.e("AudioRecorder", "mergePCMFilesToWAVFile fail");
throw new IllegalStateException("mergePCMFilesToWAVFile fail");
}
}
});
}
/**
* 将单个pcm文件转化为wav文件
*/
private void makePCMFileToWAVFile() {
mExecutorService.execute(new Runnable() {
@Override
public void run() {
if (PcmToWav.makePCMFileToWAVFile(FileUtils.getPcmFileAbsolutePath(fileName), FileUtils.getWavFileAbsolutePath(fileName), true)) {
//操作成功
} else {
//操作失败
Log.e("AudioRecorder", "makePCMFileToWAVFile fail");
throw new IllegalStateException("makePCMFileToWAVFile fail");
}
}
});
}
/**
* 录音对象的状态
*/
public enum Status {
//未开始
STATUS_NO_READY,
//预备
STATUS_READY,
//录音
STATUS_START,
//暂停
STATUS_PAUSE,
//停止
STATUS_STOP
}
/**
* 获取录音对象的状态
*
* @return
*/
public Status getStatus() {
return status;
}
/**
* 获取本次录音文件的个数
*
* @return
*/
public int getPcmFilesCount() {
return filesName.size();
}
public RecordStreamListener getListener() {
return listener;
}
public void setListener(RecordStreamListener listener) {
this.listener = listener;
}
} 2：PcmToWav
package com.hxl.pauserecord.record;
import android.util.Log;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Created by HXL on 16/8/11.
* 将pcm文件转化为wav文件
*/
public class PcmToWav {
/**
* 合并多个pcm文件为一个wav文件
*
* @param filePathList pcm文件路径集合
* @param destinationPath 目标wav文件路径
* @return true|false
*/
public static boolean mergePCMFilesToWAVFile(List filePathList,
String destinationPath) {
File[] file = new File[filePathList.size()];
byte buffer[] = null;
int TOTAL_SIZE = 0;
int fileNum = filePathList.size();
for (int i = 0; i < fileNum; i++) {
file[i] = new File(filePathList.get(i));
TOTAL_SIZE += file[i].length();
}
// 填入参数，比特率等等。这里用的是16位单声道 8000 hz
WaveHeader header = new WaveHeader();
// 长度字段 = 内容的大小（TOTAL_SIZE) +
// 头部字段的大小(不包括前面4字节的标识符RIFF以及fileLength本身的4字节)
header.fileLength = TOTAL_SIZE + (44 - 8);
header.FmtHdrLeth = 16;
header.BitsPerSample = 16;
header.Channels = 2;
header.FormatTag = 0x0001;
header.SamplesPerSec = 8000;
header.BlockAlign = (short) (header.Channels * header.BitsPerSample / 8);
header.AvgBytesPerSec = header.BlockAlign * header.SamplesPerSec;
header.DataHdrLeth = TOTAL_SIZE;
byte[] h = null;
try {
h = header.getHeader();
} catch (IOException e1) {
Log.e("PcmToWav", e1.getMessage());
return false;
}
if (h.length != 44) // WAV标准，头部应该是44字节,如果不是44个字节则不进行转换文件
return false;
//先删除目标文件
File destfile = new File(destinationPath);
if (destfile.exists())
destfile.delete();
//合成所有的pcm文件的数据，写到目标文件
try {
buffer = new byte[1024 * 4]; // Length of All Files, Total Size
InputStream inStream = null;
OutputStream ouStream = null;
ouStream = new BufferedOutputStream(new FileOutputStream(
destinationPath));
ouStream.write(h, 0, h.length);
for (int j = 0; j < fileNum; j++) {
inStream = new BufferedInputStream(new FileInputStream(file[j]));
int size = inStream.read(buffer);
while (size != -1) {
ouStream.write(buffer);
size = inStream.read(buffer);
}
inStream.close();
}
ouStream.close();
} catch (FileNotFoundException e) {
Log.e("PcmToWav", e.getMessage());
return false;
} catch (IOException ioe) {
Log.e("PcmToWav", ioe.getMessage());
return false;
}
clearFiles(filePathList);
Log.i("PcmToWav", "mergePCMFilesToWAVFile success!" + new SimpleDateFormat("yyyy-MM-dd hh:mm").format(new Date()));
return true;
}
/**
* 将一个pcm文件转化为wav文件
*
* @param pcmPath pcm文件路径
* @param destinationPath 目标文件路径(wav)
* @param deletePcmFile 是否删除源文件
* @return
*/
public static boolean makePCMFileToWAVFile(String pcmPath, String destinationPath, boolean deletePcmFile) {
byte buffer[] = null;
int TOTAL_SIZE = 0;
File file = new File(pcmPath);
if (!file.exists()) {
return false;
}
TOTAL_SIZE = (int) file.length();
// 填入参数，比特率等等。这里用的是16位单声道 8000 hz
WaveHeader header = new WaveHeader();
// 长度字段 = 内容的大小（TOTAL_SIZE) +
// 头部字段的大小(不包括前面4字节的标识符RIFF以及fileLength本身的4字节)
header.fileLength = TOTAL_SIZE + (44 - 8);
header.FmtHdrLeth = 16;
header.BitsPerSample = 16;
header.Channels = 2;
header.FormatTag = 0x0001;
header.SamplesPerSec = 8000;
header.BlockAlign = (short) (header.Channels * header.BitsPerSample / 8);
header.AvgBytesPerSec = header.BlockAlign * header.SamplesPerSec;
header.DataHdrLeth = TOTAL_SIZE;
byte[] h = null;
try {
h = header.getHeader();
} catch (IOException e1) {
Log.e("PcmToWav", e1.getMessage());
return false;
}
if (h.length != 44) // WAV标准，头部应该是44字节,如果不是44个字节则不进行转换文件
return false;
//先删除目标文件
File destfile = new File(destinationPath);
if (destfile.exists())
destfile.delete();
//合成所有的pcm文件的数据，写到目标文件
try {
buffer = new byte[1024 * 4]; // Length of All Files, Total Size
InputStream inStream = null;
OutputStream ouStream = null;
ouStream = new BufferedOutputStream(new FileOutputStream(
destinationPath));
ouStream.write(h, 0, h.length);
inStream = new BufferedInputStream(new FileInputStream(file));
int size = inStream.read(buffer);
while (size != -1) {
ouStream.write(buffer);
size = inStream.read(buffer);
}
inStream.close();
ouStream.close();
} catch (FileNotFoundException e) {
Log.e("PcmToWav", e.getMessage());
return false;
} catch (IOException ioe) {
Log.e("PcmToWav", ioe.getMessage());
return false;
}
if (deletePcmFile) {
file.delete();
}
Log.i("PcmToWav", "makePCMFileToWAVFile success!" + new SimpleDateFormat("yyyy-MM-dd hh:mm").format(new Date()));
return true;
}
/**
* 清除文件
*
* @param filePathList
*/
private static void clearFiles(List filePathList) {
for (int i = 0; i < filePathList.size(); i++) {
File file = new File(filePathList.get(i));
if (file.exists()) {
file.delete();
}
}
}
} 3、WaveHeader类：
package com.hxl.pauserecord.record;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
/**
* Created by HXL on 16/3/9.
* wav文件头
*/
public class WaveHeader {
public final char fileID[] = {'R', 'I', 'F', 'F'};
public int fileLength;
public char wavTag[] = {'W', 'A', 'V', 'E'};;
public char FmtHdrID[] = {'f', 'm', 't', ' '};
public int FmtHdrLeth;
public short FormatTag;
public short Channels;
public int SamplesPerSec;
public int AvgBytesPerSec;
public short BlockAlign;
public short BitsPerSample;
public char DataHdrID[] = {'d','a','t','a'};
public int DataHdrLeth;
public byte[] getHeader() throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
WriteChar(bos, fileID);
WriteInt(bos, fileLength);
WriteChar(bos, wavTag);
WriteChar(bos, FmtHdrID);
WriteInt(bos,FmtHdrLeth);
WriteShort(bos,FormatTag);
WriteShort(bos,Channels);
WriteInt(bos,SamplesPerSec);
WriteInt(bos,AvgBytesPerSec);
WriteShort(bos,BlockAlign);
WriteShort(bos,BitsPerSample);
WriteChar(bos,DataHdrID);
WriteInt(bos,DataHdrLeth);
bos.flush();
byte[] r = bos.toByteArray();
bos.close();
return r;
}
private void WriteShort(ByteArrayOutputStream bos, int s) throws IOException {
byte[] mybyte = new byte[2];
mybyte[1] =(byte)( (s << 16) >> 24 );
mybyte[0] =(byte)( (s << 24) >> 24 );
bos.write(mybyte);
}
private void WriteInt(ByteArrayOutputStream bos, int n) throws IOException {
byte[] buf = new byte[4];
buf[3] =(byte)( n >> 24 );
buf[2] =(byte)( (n << 8) >> 24 );
buf[1] =(byte)( (n << 16) >> 24 );
buf[0] =(byte)( (n << 24) >> 24 );
bos.write(buf);
}
private void WriteChar(ByteArrayOutputStream bos, char[] id) {
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