这个Demo是用前文的Lame库写的，分两步走，第一步使用raw格式录音，第二步转换。部分代码抄自三星的demo. android lame库:Android开发 使用Lame把音频文件转换成mp3格式
package com.pocketdigi.recordermp3;
import java.io.BufferedOutputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import com.pocketdigi.utils.FLameUtils;
public class MainActivity extends Activity {
Button record,raw2mp3;
boolean isRecording=false;
private short[] mBuffer;
AudioRecord mRecorder;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
record=(Button)findViewById(R.id.record);
raw2mp3=(Button)findViewById(R.id.raw2mp3);
initRecorder();
final String tempFile=Environment.getExternalStorageDirectory()+"/aa.raw";
final String mp3File=Environment.getExternalStorageDirectory()+"/bb.mp3";
record.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(isRecording)
{
record.setText("录音");
isRecording=false;
mRecorder.stop();
}else{
record.setText("停止");
isRecording=true;
mRecorder.startRecording();
startBufferedWrite(new File(tempFile));
}
}
});
raw2mp3.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(isRecording)
{
return;
}
File file=new File(tempFile);
if(!file.exists())
{
return;
}
new Thread()
{
public void run()
{
FLameUtils lameUtils=new FLameUtils(1, 16000, 96);
System.out.println(lameUtils.raw2mp3(tempFile, mp3File));
}
}.start();
}
});
}
/**
* 初始化Recorder
*/
public void initRecorder()
{
int bufferSize = AudioRecord.getMinBufferSize(16000, AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT);
mBuffer = new short[bufferSize];
mRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, 16000, AudioFormat.CHANNEL_IN_MONO,
AudioFormat.ENCODING_PCM_16BIT, bufferSize);
}
/**
* 写入到文件
* @param file
*/
private void startBufferedWrite(final File file) {
new Thread(new Runnable() {
@Override
public void run() {
DataOutputStream output = null;
try {
output = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file)));
while (isRecording) {
int readSize = mRecorder.read(mBuffer, 0, mBuffer.length);
for (int i = 0; i < readSize; i++) {
output.writeShort(mBuffer[i]);
}
}
} catch (IOException e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
} finally {
if (output != null) {
try {
output.flush();
} catch (IOException e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
} finally {
try {
output.close();
} catch (IOException e) {
Toast.makeText(MainActivity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
}
}
}
}).start();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
mRecorder.release();
}
}