Android--實現自制錄音/播放錄音程序

首先，讓我們先看下實現的截圖：

當有錄音文件存在時，會顯示在下面的ListView當中。

下面給出實現的完整代碼：

1.主程序代碼

package irdc.ex07_11;

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

import Android.app.Activity;
import android.content.Intent;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckedTextView;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

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<String> recordFiles;
private ArrayAdapter<String> 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);

/* 判斷SD Card是否插入 */
sdCardExit = Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED);
/* 取得SD Card路徑做為錄音的文件位置 */
if (sdCardExit)
myRecAudioDir = Environment.getExternalStorageDirectory();

/* 取得SD Card目錄裡的所有.amr文件 */
getRecordFiles();

adapter = new ArrayAdapter<String>(this,
R.layout.my_simple_list_item, recordFiles);
/* 將ArrayAdapter存入ListView對象中 */
myListView1.setAdapter(adapter);

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

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

/* 建立錄音檔 */
myRecAudioFile = File.createTempFile(strTempFile, ".amr",
myRecAudioDir);

mMediaRecorder01 = new MediaRecorder();
/* 設定錄音來源為麥克風 */
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("錄音中");

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()
{

@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
if (myRecAudioFile != null)
{
/* 停止錄音 */
mMediaRecorder01.stop();
/* 將錄音文件名給Adapter */
adapter.add(myRecAudioFile.getName());
mMediaRecorder01.release();
mMediaRecorder01 = null;
myTextView1.setText("停止：" + myRecAudioFile.getName());

myButton2.setEnabled(false);

isStopRecord = true;
}
}
});
/* 播放 */
myButton3.setOnClickListener(new ImageButton.OnClickListener()
{

@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
if (myPlayFile != null && myPlayFile.exists())
{
/* 開啟播放的程序 */
openFile(myPlayFile);
}

}
});
/* ?除 */
myButton4.setOnClickListener(new ImageButton.OnClickListener()
{

@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
if (myPlayFile != null)
{
/* 因將Adapter移除文件名 */
adapter.remove(myPlayFile.getName());
/* 刪除文件 */
if (myPlayFile.exists())
myPlayFile.delete();
myTextView1.setText("完成刪除");
}

}
});

myListView1.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int arg2, long arg3)
{
/* 當有點選文件名時將刪除及播放按鈕Enable */
myButton3.setEnabled(true);
myButton4.setEnabled(true);

myPlayFile = new File(myRecAudioDir.getAbsolutePath()
+ File.separator
+ ((CheckedTextView) arg1).getText());
myTextView1.setText("你選的是："
+ ((CheckedTextView) arg1).getText());
}
});

}

@Override
protected void onStop()
{
if (mMediaRecorder01 != null && !isStopRecord)
{
/* 停止錄音 */
mMediaRecorder01.stop();
mMediaRecorder01.release();
mMediaRecorder01 = null;
}
super.onStop();
}

private void getRecordFiles()
{
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)
{
/* 讀取.amr文件 */
String fileS = files[i].getName().substring(
files[i].getName().indexOf("."));
if (fileS.toLowerCase().equals(".amr"))
recordFiles.add(files[i].getName());

}
}
}
}
}

/* 開啟播放錄音文件的程序 */
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);
}

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("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;
}
}