Android MediaRecorder实现暂停断点录音功能

逃离我推掉我的手 2022-02-05 05:59 382阅读 0赞

原帖：http://www.th7.cn/Program/Android/201210/107798.shtml

最近研究了下MediaRecorder的录音功能，发现暂停之后，继续录音这个功能，网上参考的资料比较少，现在将自己的学习成果分享大家：

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。）

有图有真相：

![/][d7038259b58b6d5f5c7df044ae9fa328.jpg]

![/][98581d0bcc81ca601a053531b844cc26.jpg]

![/][90c2f12ddabd128eddb33b30a6a83ca8.png]

![/][05bcd3bb328061c6e65b6a4055307ab0.png]

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); 
            buttοnpause=(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(); 
            } 
        } 
    }

[d7038259b58b6d5f5c7df044ae9fa328.jpg]: http://www.th7.cn/d/file/p/2012/10/19/d7038259b58b6d5f5c7df044ae9fa328.jpg
[98581d0bcc81ca601a053531b844cc26.jpg]: http://www.th7.cn/d/file/p/2012/10/19/98581d0bcc81ca601a053531b844cc26.jpg
[90c2f12ddabd128eddb33b30a6a83ca8.png]: http://www.th7.cn/d/file/p/2012/10/19/90c2f12ddabd128eddb33b30a6a83ca8.png
[05bcd3bb328061c6e65b6a4055307ab0.png]: http://www.th7.cn/d/file/p/2012/10/19/05bcd3bb328061c6e65b6a4055307ab0.png