android mediarecord 实现暂停断点录音功能

android mediarecord 实现暂停断点录音功能

原文出处：blog.csdn.net/wanli_smile/article/details/7715030

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。）

资源代码：

http://download.csdn.net/detail/wanli_smile/4410240

有图有真相：

[java] view plaincopy

publicclassEX07extendsActivity{
privateImageButtonmyButton1;
privateImageButtonmyButton2;
privateImageButtonmyButton3;
privateImageButtonmyButton4;
privateButtonmyButton;
privateListViewmyListView1;
privateStringstrTempFile="YYT_";
privateFilemyRecAudioFile;
/**录音保存路径**/
privateFilemyRecAudioDir;
privateFilemyPlayFile;
privateMediaRecordermMediaRecorder01;
privateintmMinute;
privatebooleanxx=true;
/**存放音频文件列表**/
privateArrayList<String>recordFiles;
privateArrayAdapter<String>adapter;
privateTextViewmyTextView1;
/**文件存在**/
privatebooleansdcardExit;
/**是否停止录音**/
privatebooleanisStopRecord;
/**按钮背景图片的标志位**/
privatebooleansigle=false;
privateStringlength1=null;
privatefinalStringSUFFIX=".amr";
/**暂停按钮**/
Buttonbuttonpause;
/**记录需要合成的几段amr语音文件**/
privateArrayList<String>list;
intsecond=0;
intminute=0;
/**计时器**/
Timertimer;
/**是否暂停标志位**/
privatebooleanisPause;
/**在暂停状态中**/
privatebooleaninThePause;
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
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=newArrayList<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sdCard是否插入
sdcardExit=Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
//取得sdcard路径作为录音文件的位置
if(sdcardExit){
StringpathStr=Environment.getExternalStorageDirectory().getPath()+"/YYT";
myRecAudioDir=newFile(pathStr);
if(!myRecAudioDir.exists()){
myRecAudioDir.mkdirs();
Log.v("录音","创建录音文件！"+myRecAudioDir.exists());
}
//Environment.getExternalStorageDirectory().getPath()+"/"+PREFIX+"/";
}
//取得sdcard目录里的.arm文件
getRecordFiles();
adapter=newArrayAdapter<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(newImageButton.OnClickListener(){
@Override
publicvoidonClick(Viewv){
second=0;
minute=0;
list.clear();
//Calendarc=Calendar.getInstance();
//intmMinute1=c.get(Calendar.MINUTE);
sigle=true;
//TODOAuto-generatedmethodstub
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(newImageButton.OnClickListener(){
@Override
publicvoidonClick(Viewv){
xx=false;
sigle=true;
timer.cancel();
//TODOAuto-generatedmethodstub
//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());
DecimalFormatdf=newDecimalFormat("#.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)+"";
//DecimalFormatdf=newDecimalFormat("#.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(newImageButton.OnClickListener(){
@Override
publicvoidonClick(Viewv){
sigle=true;
//TODOAuto-generatedmethodstub
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(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
sigle=true;
//TODOAuto-generatedmethodstub
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(newOnClickListener(){
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
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(newAdapterView.OnItemClickListener(){
@Override
publicvoidonItemClick(AdapterView<?>arg,Viewarg1,
intarg2,longarg3){
//TODOAuto-generatedmethodstub
//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=newFile(myRecAudioDir.getAbsolutePath()
+File.separator
+((TextView)arg1).getText().toString());
DecimalFormatdf=newDecimalFormat("#.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(newButton.OnClickListener(){
@Override
publicvoidonClick(Viewv){
//TODOAuto-generatedmethodstub
showSizeshow=newshowSize();
Stringtext=show.showsize();
Toast.makeText(EX07.this,text,Toast.LENGTH_LONG).show();
}
});
}
protectedvoidrecodeStop(){
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
protectedvoidonStop(){
//TODOAuto-generatedmethodstub
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
*/
privatevoidgetRecordFiles(){
//TODOAuto-generatedmethodstub
recordFiles=newArrayList<String>();
if(sdcardExit){
Filefiles[]=myRecAudioDir.listFiles();
if(files!=null){
for(inti=0;i<files.length;i++){
if(files[i].getName().indexOf(".")>=0){//只取.amr文件
StringfileS=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
privatevoidopenFile(Filef){
Intentintent=newIntent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
Stringtype=getMIMEType(f);
intent.setDataAndType(Uri.fromFile(f),type);
startActivity(intent);
//Uriuri=Uri.fromFile(f);
//MediaPlayermediaPlayer=MediaPlayer.create(this,uri);
//try{
//mediaPlayer.prepare();
//}catch(IllegalStateExceptione){
////TODOAuto-generatedcatchblock
//e.printStackTrace();
//}catch(IOExceptione){
////TODOAuto-generatedcatchblock
//e.printStackTrace();
//}
//mediaPlayer.start();
}
privateStringgetMIMEType(Filef){
Stringend=f.getName().substring(f.getName().lastIndexOf(".")+1,
f.getName().length()).toLowerCase();
Stringtype="";
if(end.equals("mp3")||end.equals("aac")||end.equals("amr")
||end.equals("mpeg")||end.equals("mp4")){
type="audio";
}elseif(end.equals("jpg")||end.equals("gif")||end.equals("png")
||end.equals("jpeg")){
type="image";
}else{
type="*";
}
type+="/";
returntype;
}
privatevoidstart(){
TimerTasktimerTask=newTimerTask(){
@Override
publicvoidrun(){
//TODOAuto-generatedmethodstub
second++;
if(second>=60){
second=0;
minute++;
}
handler.sendEmptyMessage(1);
}
};
timer=newTimer();
timer.schedule(timerTask,1000,1000);
try{
if(!sdcardExit){
Toast.makeText(EX07.this,"请插入SDcard",
Toast.LENGTH_LONG).show();
return;
}
StringmMinute1=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=newFile(myRecAudioDir,mMinute1+SUFFIX);
mMediaRecorder01=newMediaRecorder();
//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(newOnInfoListener(){
@Override
publicvoidonInfo(MediaRecordermr,intwhat,intextra){
//TODOAuto-generatedmethodstub
inta=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(IOExceptione){
e.printStackTrace();
}
}
privateStringgetTime(){
SimpleDateFormatformatter=newSimpleDateFormat("yyyy年MM月dd日HH：mm：ss");
DatecurDate=newDate(System.currentTimeMillis());//获取当前时间
Stringtime=formatter.format(curDate);
System.out.println("当前时间");
returntime;
}
Handlerhandler=newHandler(){
@Override
publicvoidhandleMessage(Messagemsg){
//TODOAuto-generatedmethodstub
super.handleMessage(msg);
myTextView1.setText("录音时间："+minute+":"+second);
}
};
/**
*@paramisAddLastRecord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
*/
publicvoidgetInputCollection(Listlist,booleanisAddLastRecord){
StringmMinute1=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
Filefile1=newFile(myRecAudioDir,mMinute1+SUFFIX);
FileOutputStreamfileOutputStream=null;
if(!file1.exists()){
try{
file1.createNewFile();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
try{
fileOutputStream=newFileOutputStream(file1);
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
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(inti=0;i<list.size();i++){
Filefile=newFile((String)list.get(i));
Log.d("list的长度",list.size()+"");
try{
FileInputStreamfileInputStream=newFileInputStream(file);
byte[]myByte=newbyte[fileInputStream.available()];
//文件长度
intlength=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(Exceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
//结束后关闭流
try{
fileOutputStream.close();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
//加上当前正在录音的这一段
//if(isAddLastRecord){
//
//
////刚刚录音的
//try{
//FileInputStreamfileInputStream=newFileInputStream(myRecAudioFile);
//byte[]myByte=newbyte[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(Exceptione){
////TODOAuto-generatedcatchblock
//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());
}
privatevoiddeleteListRecord(booleanisAddLastRecord){
for(inti=0;i<list.size();i++){
Filefile=newFile((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();
}
}
}

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