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。
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; 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<String> filesName = new ArrayList<>(); //线程池 private ExecutorService mExecutorService; //录音监听 private RecordStreamListener listener; public AudioRecorder() { mExecutorService = Executors.newCachedThreadPool(); } 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; } 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; } 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); } }); } 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; } } 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(); } } public void release() { Log.d("AudioRecorder", "===release==="); //假如有暂停录音 try { if (filesName.size() > 0) { List<String> 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; } public void canel() { filesName.clear(); fileName = null; if (audioRecord != null) { audioRecord.release(); audioRecord = null; } status = Status.STATUS_NO_READY; } 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()); } } private void mergePCMFilesToWAVFile(final List<String> 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"); } } }); } 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"); } } }); } 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 } public Status getStatus() { return status; } public int getPcmFilesCount() { return filesName.size(); } public RecordStreamListener getListener() { return listener; } public void setListener(RecordStreamListener listener) { this.listener = listener; } }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; public class PcmToWav { public static boolean mergePCMFilesToWAVFile(List<String> 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; } 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; } private static void clearFiles(List<String> filePathList) { for (int i = 0; i < filePathList.size(); i++) { File file = new File(filePathList.get(i)); if (file.exists()) { file.delete(); } } } }WaveHeader类：
package com.hxl.pauserecord.record; import java.io.ByteArrayOutputStream; import java.io.IOException; 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) { for (int i=0; i<id.length; i++) { char c = id[i]; bos.write(c); } } }看完上述内容，你们掌握Android中怎么利用AudioRecord实现暂停录音功能的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注编程网行业资讯频道，感谢各位的阅读！
