基本原理如下：MediaRecorder通过MIC录音，系统没有自带的pause功能，每次暂停录音，都会结束本次的录音。现在本人的设计思路是：MediaRecorder录音暂停时，保存这段所录下的音频A，继续录音后，再次暂停，保留录音音频B；以此类推直到最终的录音结束时，依次读取之前保存的A、B……的录音文件，并将其合并在一起。涉及的技术：文件的保存读取、音频的合并等
音频的合并：设置MediaRecorder的音频输出格式mMediaRecorder01.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
mMediaRecorder01 .setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
输出的是amr格式。amr的音频文件的文件头，相对来说是固定的6个字节的固定字符，A.amr文件和B.amr文件的合并，只需将B以字节流读取，去
掉前6个字节，和A的字节流合并后保存，就实现了音频合并，不涉及复杂的音频编码问题。（MediaRecorder的音频输出格式比较多，有jpgg、MP3等之类的格式，合成的原理大同小异，只需要注意他们的音频文件头的格式就可以了。）
public class EX07 extends Activity { private ImageButton myButton1; private ImageButton myButton2; private ImageButton myButton3; private ImageButton myButton4; private Button myButton; private ListView myListView1; private String strTempFile = "YYT_"; private File myRecAudioFile; /**录音保存路径**/ private File myRecAudioDir; private File myPlayFile; private MediaRecorder mMediaRecorder01; private int mMinute; private boolean xx=true; /**存放音频文件列表**/ private ArrayList<String> recordFiles; private ArrayAdapter<String> adapter; private TextView myTextView1; /**文件存在**/ private boolean sdcardExit; /**是否停止录音**/ private boolean isStopRecord; /**按钮背景图片的标志位**/ private boolean sigle = false; private String length1 = null; private final String SUFFIX=".amr"; /**暂停按钮**/ Button buttonpause; /**记录需要合成的几段amr语音文件**/ private ArrayList<String> list; int second=0; int minute=0; /**计时器**/ Timer timer; /**是否暂停标志位**/ private boolean isPause; /**在暂停状态中**/ private boolean inThePause; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //暂停标志位 为false isPause=false; //暂停状态标志位 inThePause=false; //初始化list list=new ArrayList<String>(); //四个按钮 myButton1 = (ImageButton) findViewById(R.id.ImageButton01); myButton2 = (ImageButton) findViewById(R.id.ImageButton02); myButton3 = (ImageButton) findViewById(R.id.ImageButton03); myButton4 = (ImageButton) findViewById(R.id.ImageButton04); myButton = (Button) findViewById(R.id.myButton); buttonpause=(Button)findViewById(R.id.mypuase); myListView1 = (ListView) findViewById(R.id.ListView01); myTextView1 = (TextView) findViewById(R.id.TextView01); myButton2.setEnabled(false); myButton3.setEnabled(false); myButton4.setEnabled(false); myPlayFile=null; // 判断sd Card是否插入 sdcardExit = Environment.getExternalStorageState().equals( android.os.Environment.MEDIA_MOUNTED); // 取得sd card路径作为录音文件的位置 if (sdcardExit){ String pathStr = Environment.getExternalStorageDirectory().getPath()+"/YYT"; myRecAudioDir= new File(pathStr); if(!myRecAudioDir.exists()){ myRecAudioDir.mkdirs(); Log.v("录音", "创建录音文件！" + myRecAudioDir.exists()); } // Environment.getExternalStorageDirectory().getPath() + "/" + PREFIX + "/"; } // 取得sd card 目录里的.arm文件 getRecordFiles(); adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, recordFiles); // 将ArrayAdater添加ListView对象中 myListView1.setAdapter(adapter); // 录音 myButton1.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View v) { second=0; minute=0; list.clear(); // Calendar c=Calendar.getInstance(); // int mMinute1=c.get(Calendar.MINUTE); sigle = true; // TODO Auto-generated method stub start(); if (sigle = false) { myButton1.setBackgroundResource(R.drawable.record_hover1); } else { myButton1.setBackgroundResource(R.drawable.record_dis1); myButton2.setBackgroundResource(R.drawable.stop_hover2); myButton3.setBackgroundResource(R.drawable.play_hover1); myButton4.setBackgroundResource(R.drawable.delete_hover); } } }); // 停止 myButton2.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View v) { xx=false; sigle = true; timer.cancel(); // TODO Auto-generated method stub //这里写暂停处理的 文件！加上list里面 语音合成起来 if(isPause){ //在暂停状态按下结束键,处理list就可以了 if(inThePause){ getInputCollection(list, false); } //在正在录音时，处理list里面的和正在录音的语音 else{ list.add(myRecAudioFile.getPath()); recodeStop(); getInputCollection(list, true); } //还原标志位 isPause=false; inThePause=false; buttonpause.setText("暂停录音"); // adapter.add(myRecAudioFile.getName()); } //若录音没有经过任何暂停 else{ if (myRecAudioFile != null) { // 停止录音 mMediaRecorder01.stop(); mMediaRecorder01.release(); mMediaRecorder01 = null; // 将录音频文件给Adapter adapter.add(myRecAudioFile.getName()); DecimalFormat df = new DecimalFormat("#.000"); if (myRecAudioFile.length() <= 1024*1024) { //length1 = (myRecAudioFile.length() / 1024.0)+""; length1=df.format(myRecAudioFile.length() / 1024.0)+"K"; } else { //length1 = (myRecAudioFile.length() / 1024.0 / 1024)+""; //DecimalFormat df = new DecimalFormat("#.000"); length1=df.format(myRecAudioFile.length() / 1024.0 / 1024)+"M"; } System.out.println(length1); myTextView1.setText("停 止" + myRecAudioFile.getName() + "文件大小为：" + length1); myButton2.setEnabled(false); } } if (sigle = false) { myButton2.setBackgroundResource(R.drawable.stop_hover2); } else { myButton1.setBackgroundResource(R.drawable.record_hover1); myButton2.setBackgroundResource(R.drawable.stop1); myButton3.setBackgroundResource(R.drawable.play_hover1); myButton4.setBackgroundResource(R.drawable.delete_hover); } //停止录音了 isStopRecord = true; } }); // 播放 myButton3.setOnClickListener(new ImageButton.OnClickListener() { @Override public void onClick(View v) { sigle = true; // TODO Auto-generated method stub if (myPlayFile != null && myPlayFile.exists()) { // 打开播放程序 openFile(myPlayFile); } else { Toast.makeText(EX07.this, "你选的是一个空文件", Toast.LENGTH_LONG) .show(); Log.d("没有选择文件","没有选择文件"); } if (sigle = false) { myButton3.setBackgroundResource(R.drawable.play_hover1); } else { myButton1.setBackgroundResource(R.drawable.record_hover1); myButton2.setBackgroundResource(R.drawable.stop_hover2); myButton3.setBackgroundResource(R.drawable.play1); myButton4.setBackgroundResource(R.drawable.delete_hover); } } }); // 删除 myButton4.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { sigle = true; // TODO Auto-generated method stub if (myPlayFile != null) { // 先将Adapter删除文件名 adapter.remove(myPlayFile.getName()); // 删除文件 if (myPlayFile.exists()) myPlayFile.delete(); myTextView1.setText("完成删除！"); } if (sigle = false) { myButton4.setBackgroundResource(R.drawable.delete_hover); } else { myButton1.setBackgroundResource(R.drawable.record_hover1); myButton2.setBackgroundResource(R.drawable.stop_hover2); myButton3.setBackgroundResource(R.drawable.play_hover1); myButton4.setBackgroundResource(R.drawable.delete_dis); } } }); /** * 暂停按钮,记录之前保存的语音文件 */ buttonpause.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub isPause=true; //已经暂停过了，再次点击按钮 开始录音，录音状态在录音中 if(inThePause){ buttonpause.setText("暂停录音"); start(); inThePause=false; } //正在录音，点击暂停,现在录音状态为暂停 else{ //当前正在录音的文件名，全程 list.add(myRecAudioFile.getPath()); inThePause=true; recodeStop(); //start(); buttonpause.setText("继续录音"); //计时停止 timer.cancel(); } } }); myListView1 .setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg, View arg1, int arg2, long arg3) { // TODO Auto-generated method stub // 当有单点击文件名时将删除按钮及播放按钮Enable myButton3.setEnabled(true); myButton4.setEnabled(true); myPlayFile = new File(myRecAudioDir.getAbsolutePath() + File.separator + ((TextView) arg1).getText().toString()); DecimalFormat df = new DecimalFormat("#.000"); if (myPlayFile.length() <= 1024*1024) { length1=df.format(myPlayFile.length() / 1024.0)+"K"; } else { length1=df.format(myPlayFile.length() / 1024.0/1024)+"M"; } myTextView1.setText("你选的是" + ((TextView) arg1).getText().toString() + "文件大小为：" + length1); Toast.makeText(EX07.this,"你选的是" + (((TextView) arg1).getText())+ "文件大小为：" + length1, Toast.LENGTH_LONG).show(); } }); myButton.setOnClickListener(new Button.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub showSize show = new showSize(); String text = show.showsize(); Toast.makeText(EX07.this, text, Toast.LENGTH_LONG).show(); } }); } protected void recodeStop() { if (mMediaRecorder01 != null && !isStopRecord) { // 停止录音 mMediaRecorder01.stop(); mMediaRecorder01.release(); mMediaRecorder01 = null; } timer.cancel(); } /** * activity的生命周期，stop时关闭录音资源 */ @Override protected void onStop() { // TODO Auto-generated method stub if (mMediaRecorder01 != null && !isStopRecord) { // 停止录音 mMediaRecorder01.stop(); mMediaRecorder01.release(); mMediaRecorder01 = null; } super.onStop(); } /** * 获取目录下的所有音频文件 */ private void getRecordFiles() { // TODO Auto-generated method stub recordFiles = new ArrayList<String>(); if (sdcardExit) { File files[] = myRecAudioDir.listFiles(); if (files != null) { for (int i = 0; i < files.length; i++) { if (files[i].getName().indexOf(".") >= 0) { // 只取.amr 文件 String fileS = files[i].getName().substring( files[i].getName().indexOf(".")); if (fileS.toLowerCase().equals(".mp3") || fileS.toLowerCase().equals(".amr") || fileS.toLowerCase().equals(".mp4")) recordFiles.add(files[i].getName()); } } } } } // 打开录音播放程序 private void openFile(File f) { Intent intent = new Intent(); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intent.setAction(android.content.Intent.ACTION_VIEW); String type = getMIMEType(f); intent.setDataAndType(Uri.fromFile(f), type); startActivity(intent); // Uri uri=Uri.fromFile(f); // MediaPlayer mediaPlayer=MediaPlayer.create(this, uri); // try { // mediaPlayer.prepare(); // } catch (IllegalStateException e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } catch (IOException e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } // mediaPlayer.start(); } private String getMIMEType(File f) { String end = f.getName().substring(f.getName().lastIndexOf(".") + 1, f.getName().length()).toLowerCase(); String type = ""; if (end.equals("mp3") || end.equals("aac") || end.equals("amr") || end.equals("mpeg") || end.equals("mp4")) { type = "audio"; } else if (end.equals("jpg") || end.equals("gif") || end.equals("png") || end.equals("jpeg")) { type = "image"; } else { type = "*"; } type += "/"; return type; } private void start(){ TimerTask timerTask=new TimerTask() { @Override public void run() { // TODO Auto-generated method stub second++; if(second>=60){ second=0; minute++; } handler.sendEmptyMessage(1); } }; timer=new Timer(); timer.schedule(timerTask, 1000,1000); try { if (!sdcardExit) { Toast.makeText(EX07.this, "请插入SD card", Toast.LENGTH_LONG).show(); return; } String mMinute1=getTime(); Toast.makeText(EX07.this, "当前时间是:"+mMinute1,Toast.LENGTH_LONG).show(); // 创建音频文件 // myRecAudioFile = File.createTempFile(mMinute1, ".amr", // myRecAudioDir); myRecAudioFile=new File(myRecAudioDir,mMinute1+SUFFIX); mMediaRecorder01 = new MediaRecorder(); // 设置录音为麦克风 mMediaRecorder01 .setAudioSource(MediaRecorder.AudioSource.MIC); mMediaRecorder01 .setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR); mMediaRecorder01 .setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); //录音文件保存这里 mMediaRecorder01.setOutputFile(myRecAudioFile .getAbsolutePath()); mMediaRecorder01.prepare(); mMediaRecorder01.start(); // mMediaRecorder01.getMaxAmplitude(); // mMediaRecorder01.getAudioSourceMax(); mMediaRecorder01.setOnInfoListener(new OnInfoListener() { @Override public void onInfo(MediaRecorder mr, int what, int extra) { // TODO Auto-generated method stub int a=mr.getMaxAmplitude(); Toast.makeText(EX07.this, a, 500).show(); } }); myTextView1.setText("录音中......"); myButton2.setEnabled(true); myButton3.setEnabled(false); myButton4.setEnabled(false); isStopRecord = false; } catch (IOException e) { e.printStackTrace(); } } private String getTime(){ SimpleDateFormat formatter = new SimpleDateFormat ("yyyy年MM月dd日HH：mm：ss"); Date curDate=new Date(System.currentTimeMillis());//获取当前时间 String time = formatter.format(curDate); System.out.println("当前时间"); return time; } Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { // TODO Auto-generated method stub super.handleMessage(msg); myTextView1.setText("录音时间："+minute+":"+second); } }; /** * @param isAddLastRecord 是否需要添加list之外的最新录音，一起合并 * @return 将合并的流用字符保存 */ public void getInputCollection(List list,boolean isAddLastRecord){ String mMinute1=getTime(); Toast.makeText(EX07.this, "当前时间是:"+mMinute1,Toast.LENGTH_LONG).show(); // 创建音频文件,合并的文件放这里 File file1=new File(myRecAudioDir,mMinute1+SUFFIX); FileOutputStream fileOutputStream = null; if(!file1.exists()){ try { file1.createNewFile(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } try { fileOutputStream=new FileOutputStream(file1); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //list里面为暂停录音 所产生的 几段录音文件的名字，中间几段文件的减去前面的6个字节头文件 for(int i=0;i<list.size();i++){ File file=new File((String) list.get(i)); Log.d("list的长度", list.size()+""); try { FileInputStream fileInputStream=new FileInputStream(file); byte []myByte=new byte[fileInputStream.available()]; //文件长度 int length = myByte.length; //头文件 if(i==0){ while(fileInputStream.read(myByte)!=-1){ fileOutputStream.write(myByte, 0,length); } } //之后的文件，去掉头文件就可以了 else{ while(fileInputStream.read(myByte)!=-1){ fileOutputStream.write(myByte, 6, length-6); } } fileOutputStream.flush(); fileInputStream.close(); System.out.println("合成文件长度："+file1.length()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } //结束后关闭流 try { fileOutputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } //加上当前正在录音的这一段 // if(isAddLastRecord){ // // // //刚刚录音的 // try { // FileInputStream fileInputStream=new FileInputStream(myRecAudioFile); // byte []myByte=new byte[fileInputStream.available()]; // System.out.println(fileInputStream.available()+""); // while(fileInputStream.read(myByte)!=-1){ // //outputStream. // fileOutputStream.write(myByte, 6, (fileInputStream.available()-6)); // } // // fileOutputStream.flush(); // fileInputStream.close(); // fileOutputStream.close(); // System.out.println("合成文件长度："+file1.length()); // } catch (Exception e) { // // TODO Auto-generated catch block // e.printStackTrace(); // } // // } //合成一个文件后，删除之前暂停录音所保存的零碎合成文件 deleteListRecord(isAddLastRecord); // adapter.add(file1.getName()); } private void deleteListRecord(boolean isAddLastRecord){ for(int i=0;i<list.size();i++){ File file=new File((String) list.get(i)); if(file.exists()){ file.delete(); } } //正在暂停后，继续录音的这一段音频文件 if(isAddLastRecord){ myRecAudioFile.delete(); } } }