首先，让我们先看下实现的截图：

当有录音文件存在时，会显示在下面的ListView当中。

下面给出实现的完整代码：

1.主程序代码

package irdc.ex07_11;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

public class EX07_11 extends Activity
{
private ImageButton myButton1;
private ImageButton myButton2;
private ImageButton myButton3;
private ImageButton myButton4;
private ListView myListView1;
private String strTempFile = "ex07_11_";
private File myRecAudioFile;
private File myRecAudioDir;
private File myPlayFile;
private MediaRecorder mMediaRecorder01;

private ArrayList recordFiles;
private ArrayAdapter adapter;
private TextView myTextView1;
private boolean sdCardExit;
private boolean isStopRecord;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

myButton1 = (ImageButton) findViewById(R.id.ImageButton01);
myButton2 = (ImageButton) findViewById(R.id.ImageButton02);
myButton3 = (ImageButton) findViewById(R.id.ImageButton03);
myButton4 = (ImageButton) findViewById(R.id.ImageButton04);
myListView1 = (ListView) findViewById(R.id.ListView01);
myTextView1 = (TextView) findViewById(R.id.TextView01);
myButton2.setEnabled(false);
myButton3.setEnabled(false);
myButton4.setEnabled(false);

/* 判断SD Card是否插入 */
sdCardExit = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
/* 取得SD Card路径做为录音的文件位置 */
if (sdCardExit)
myRecAudioDir = Environment.getExternalStorageDirectory();

/* 取得SD Card目录里的所有.amr文件 */
getRecordFiles();

adapter = new ArrayAdapter(this,
R.layout.my_simple_list_item, recordFiles);
/* 将ArrayAdapter存入ListView对象中 */
myListView1.setAdapter(adapter);

/* 录音 */
myButton1.setOnClickListener(new ImageButton.OnClickListener()
{

@Override
public void onClick(View arg0)
{
try
{
if (!sdCardExit)
{
Toast.makeText(EX07_11.this, "请插入SD Card",
Toast.LENGTH_LONG).show();
return;
}

/* 建立录音档 */
myRecAudioFile = File.createTempFile(strTempFile, ".amr",
myRecAudioDir);

mMediaRecorder01 = new MediaRecorder();
/* 设定录音来源为麦克风 */
mMediaRecorder01
.setAudioSource(MediaRecorder.AudioSource.MIC);
mMediaRecorder01
.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
mMediaRecorder01
.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);

mMediaRecorder01.setOutputFile(myRecAudioFile
.getAbsolutePath());

mMediaRecorder01.prepare();

mMediaRecorder01.start();

myTextView1.setText("录音中");

myButton2.setEnabled(true);
myButton3.setEnabled(false);
myButton4.setEnabled(false);

isStopRecord = false;

} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}

}
});
/* 停止 */
myButton2.setOnClickListener(new ImageButton.OnClickListener()
{