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Android MediaRecorder實現暫停斷點錄音功能

日期：2017/3/1 10:17:56 编辑：Linux編程

最近研究了下Android MediaRecorder的錄音功能，發現暫停之後，繼續錄音這個功能，網上參考的資料比較少，現在將自己的學習成果分享大家：

基本原理如下：MediaRecorder通過MIC錄音，系統沒有自帶的pause功能，每次暫停錄音，都會結束本次的錄音。現在本人的設計思路是：MediaRecorder錄音暫停時，保存這段所錄下的音頻A，繼續錄音後，再次暫停，保留錄音音頻B；以此類推直到最終的錄音結束時，依次讀取之前保存的A、B……的錄音文件，並將其合並在一起。涉及的技術：文件的保存讀取、音頻的合並等

音頻的合並：設置MediaRecorder的音頻輸出格式mMediaRecorder01.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);

mMediaRecorder01 .setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);輸出的是amr格式。amr的音頻文件的文件頭，相對來說是固定的6個字節的固定字符，A.amr文件和B.amr文件的合並，只需將B以字節流讀取，去掉前6個字節，和A的字節流合並後保存，就實現了音頻合並，不涉及復雜的音頻編碼問題。（MediaRecorder的音頻輸出格式比較多，有jpgg、MP3等之類的格式，合成的原理大同小異，只需要注意他們的音頻文件頭的格式就可以了。）

資源代碼：

免費下載地址在 http://linux.linuxidc.com/

用戶名與密碼都是www.linuxidc.com

具體下載目錄在 /2012年資料/7月/4日/Android MediaRecorder實現暫停斷點錄音功能

有圖有真相：

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;
/**錄音保存路徑**/
private File myRecAudioDir;
private File myPlayFile;
private MediaRecorder mMediaRecorder01;
private int mMinute;
private boolean xx=true;
/**存放音頻文件列表**/
private ArrayList<String> recordFiles;
private ArrayAdapter<String> adapter;
private TextView myTextView1;
/**文件存在**/
private boolean sdcardExit;
/**是否停止錄音**/
private boolean isStopRecord;
/**按鈕背景圖片的標志位**/
private boolean sigle = false;
private String length1 = null;
private final String SUFFIX=".amr";
/**暫停按鈕**/
Button buttonpause;
/**記錄需要合成的幾段amr語音文件**/
private ArrayList<String> list;
int second=0;
int minute=0;
/**計時器**/
Timer timer;
/**是否暫停標志位**/
private boolean isPause;
/**在暫停狀態中**/
private boolean inThePause;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//暫停標志位為false
isPause=false;
//暫停狀態標志位
inThePause=false;
//初始化list
list=new ArrayList<String>();
//四個按鈕
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;
// 判斷sd Card是否插入
sdcardExit = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
// 取得sd card路徑作為錄音文件的位置
if (sdcardExit){
String pathStr = Environment.getExternalStorageDirectory().getPath()+"/YYT";
myRecAudioDir= new File(pathStr);
if(!myRecAudioDir.exists()){
myRecAudioDir.mkdirs();
Log.v("錄音", "創建錄音文件！" + myRecAudioDir.exists());
}
// Environment.getExternalStorageDirectory().getPath() + "/" + PREFIX + "/";
}
// 取得sd card 目錄裡的.arm文件
getRecordFiles();
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, recordFiles);
// 將ArrayAdater添加ListView對象中
myListView1.setAdapter(adapter);
// 錄音
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
//這裡寫暫停處理的文件！加上list裡面語音合成起來
if(isPause){
//在暫停狀態按下結束鍵,處理list就可以了
if(inThePause){
getInputCollection(list, false);
}
//在正在錄音時，處理list裡面的和正在錄音的語音
else{
list.add(myRecAudioFile.getPath());
recodeStop();
getInputCollection(list, true);
}
//還原標志位
isPause=false;
inThePause=false;
buttonpause.setText("暫停錄音");
// adapter.add(myRecAudioFile.getName());
}
//若錄音沒有經過任何暫停
else{
if (myRecAudioFile != null) {
// 停止錄音
mMediaRecorder01.stop();
mMediaRecorder01.release();
mMediaRecorder01 = null;
// 將錄音頻文件給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()
+ "文件大小為：" + 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);
}
//停止錄音了
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()) {
// 打開播放程序
openFile(myPlayFile);
} else {
Toast.makeText(EX07.this, "你選的是一個空文件", Toast.LENGTH_LONG)
.show();
Log.d("沒有選擇文件","沒有選擇文件");
}
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);
}
}
});
// 刪除
myButton4.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
sigle = true;
// TODO Auto-generated method stub
if (myPlayFile != null) {
// 先將Adapter刪除文件名
adapter.remove(myPlayFile.getName());
// 刪除文件
if (myPlayFile.exists())
myPlayFile.delete();
myTextView1.setText("完成刪除！");
}
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);
}
}
});
/**
* 暫停按鈕,記錄之前保存的語音文件
*/
buttonpause.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
isPause=true;
//已經暫停過了，再次點擊按鈕開始錄音，錄音狀態在錄音中
if(inThePause){
buttonpause.setText("暫停錄音");
start();
inThePause=false;
}
//正在錄音，點擊暫停,現在錄音狀態為暫停
else{
//當前正在錄音的文件名，全程
list.add(myRecAudioFile.getPath());
inThePause=true;
recodeStop();
//start();
buttonpause.setText("繼續錄音");
//計時停止
timer.cancel();
}
}
});
myListView1
.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
// 當有單點擊文件名時將刪除按鈕及播放按鈕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("你選的是"
+ ((TextView) arg1).getText().toString()
+ "文件大小為：" + length1);
Toast.makeText(EX07.this,"你選的是" + (((TextView) arg1).getText())+ "文件大小為：" + 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) {
// 停止錄音
mMediaRecorder01.stop();
mMediaRecorder01.release();
mMediaRecorder01 = null;
}
timer.cancel();
}
/**
* activity的生命周期，stop時關閉錄音資源
*/
@Override
protected void onStop() {
// TODO Auto-generated method stub
if (mMediaRecorder01 != null && !isStopRecord) {
// 停止錄音
mMediaRecorder01.stop();
mMediaRecorder01.release();
mMediaRecorder01 = null;
}
super.onStop();
}
/**
* 獲取目錄下的所有音頻文件
*/
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());
}
}
}
}
}
// 打開錄音播放程序
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, "請插入SD card",
Toast.LENGTH_LONG).show();
return;
}
String mMinute1=getTime();
Toast.makeText(EX07.this, "當前時間是:"+mMinute1,Toast.LENGTH_LONG).show();
// 創建音頻文件
// myRecAudioFile = File.createTempFile(mMinute1, ".amr",
// myRecAudioDir);
myRecAudioFile=new File(myRecAudioDir,mMinute1+SUFFIX);
mMediaRecorder01 = new MediaRecorder();
// 設置錄音為麥克風
mMediaRecorder01
.setAudioSource(MediaRecorder.AudioSource.MIC);
mMediaRecorder01
.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
mMediaRecorder01
.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
//錄音文件保存這裡
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("錄音中......");
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());//獲取當前時間
String time = formatter.format(curDate);
System.out.println("當前時間");
return time;
}
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
super.handleMessage(msg);
myTextView1.setText("錄音時間："+minute+":"+second);
}
};
/**
* @param isAddLastRecord 是否需要添加list之外的最新錄音，一起合並
* @return 將合並的流用字符保存
*/
public void getInputCollection(List list,boolean isAddLastRecord){
String mMinute1=getTime();
Toast.makeText(EX07.this, "當前時間是:"+mMinute1,Toast.LENGTH_LONG).show();
// 創建音頻文件,合並的文件放這裡
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裡面為暫停錄音所產生的幾段錄音文件的名字，中間幾段文件的減去前面的6個字節頭文件
for(int i=0;i<list.size();i++){
File file=new File((String) list.get(i));
Log.d("list的長度", list.size()+"");
try {
FileInputStream fileInputStream=new FileInputStream(file);
byte []myByte=new byte[fileInputStream.available()];
//文件長度
int length = myByte.length;
//頭文件
if(i==0){
while(fileInputStream.read(myByte)!=-1){
fileOutputStream.write(myByte, 0,length);
}
}
//之後的文件，去掉頭文件就可以了
else{
while(fileInputStream.read(myByte)!=-1){
fileOutputStream.write(myByte, 6, length-6);
}
}
fileOutputStream.flush();
fileInputStream.close();
System.out.println("合成文件長度："+file1.length());
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//結束後關閉流
try {
fileOutputStream.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//加上當前正在錄音的這一段
// if(isAddLastRecord){
//
//
// //剛剛錄音的
// 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("合成文件長度："+file1.length());
// } catch (Exception e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
//
// }
//合成一個文件後，刪除之前暫停錄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();
}
}
//正在暫停後，繼續錄音的這一段音頻文件
if(isAddLastRecord){
myRecAudioFile.delete();
}
}
}