录音项目源代码 ----- Android 应用开发揭秘

JAVA：

package com.yarin.android.Examples_07_05;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.content.Intent;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;


public class Activity01 extends ListActivity
{
/* 按钮 */
private Button StartButton;
private Button StopButton;
/* 录制的音频文件 */
private File mRecAudioFile;
private File mRecAudioPath;
/* MediaRecorder对象 */
private MediaRecorder mMediaRecorder;
/* 录音文件列表 */
private List<String> mMusicList = new ArrayList<String>();
/* 临时文件的前缀 */
private String strTempFile = "recaudio_";


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/* 取得按钮 */
StartButton = (Button) findViewById(R.id.StartButton);
StopButton = (Button) findViewById(R.id.StopButton);

/* 检测是否存在SD卡 */
if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED))
{
/* 得到SD卡得路径 */
mRecAudioPath = Environment.getExternalStorageDirectory();
/* 更新所有录音文件到List中 */
musicList();
}
else
{
Toast.makeText(Activity01.this, "没有SD卡", Toast.LENGTH_LONG).show();
}
/* 开始按钮事件监听 */
StartButton.setOnClickListener(new Button.OnClickListener() 
{
@Override
public void onClick(View arg0)
{
try
{
/* 创建录音文件 */
mRecAudioFile = File.createTempFile(strTempFile, ".amr", mRecAudioPath);
/* 实例化MediaRecorder对象 */
mMediaRecorder = new MediaRecorder();
/* 设置麦克风 */
mMediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
Log.i("liyong", "1");
/* 设置输出文件的格式 */
mMediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
/* 设置音频文件的编码 */
mMediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
/* 设置输出文件的路径 */
mMediaRecorder.setOutputFile(mRecAudioFile.getAbsolutePath());
/* 准备 */
mMediaRecorder.prepare();
/* 开始 */
mMediaRecorder.start();

StartButton.setText("正在录制");
}
catch (IOException e)
{
e.printStackTrace();
}
}
});
/* 停止按钮事件监听 */
StopButton.setOnClickListener(new Button.OnClickListener() 
{
@Override
public void onClick(View arg0)
{
// TODO Auto-generated method stub
if (mRecAudioFile != null)
{
/* 停止录音 */
mMediaRecorder.stop();
/* 将录音文件添加到List中 */
mMusicList.add(mRecAudioFile.getName());
ArrayAdapter<String> musicList = new ArrayAdapter<String>(Activity01.this, R.layout.list, mMusicList);
setListAdapter(musicList);
/* 释放MediaRecorder */
mMediaRecorder.release();
mMediaRecorder = null;
}
}
});
}
/* 播放录音文件 */
private void playMusic(File file)
{
Intent intent = new Intent();
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setAction(android.content.Intent.ACTION_VIEW);
/* 设置文件类型 */
intent.setDataAndType(Uri.fromFile(file), "audio");
startActivity(intent);
}
@Override
/* 当我们点击列表时，播放被点击的音乐 */
protected void onListItemClick(ListView l, View v, int position, long id)
{
/* 得到被点击的文件 */
File playfile = new File(mRecAudioPath.getAbsolutePath() + File.separator + mMusicList.get(position));
/* 播放 */
playMusic(playfile);
}
/* 播放列表 */
public void musicList()
{
// 取得指定位置的文件设置显示到播放列表
File home = mRecAudioPath;
if (home.listFiles(new MusicFilter()).length > 0)
{
for (File file : home.listFiles(new MusicFilter()))
{
mMusicList.add(file.getName());
}
ArrayAdapter<String> musicList = new ArrayAdapter<String>(Activity01.this, R.layout.list, mMusicList);
setListAdapter(musicList);
}
}
}
/* 过滤文件类型 */
class MusicFilter implements FilenameFilter
{
public boolean accept(File dir, String name)
{
return (name.endsWith(".amr"));
}

}

XML：Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.yarin.android.Examples_07_05"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Activity01"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
<uses-permission android:name="android.permission.RECORD_AUDIO"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-sdk android:minSdkVersion="5" />
</manifest> 

main.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  >
  <ListView 
  android:id="@id/android:list"
  android:layout_width="fill_parent" 
  android:layout_height="fill_parent"
  android:layout_weight="1"
  android:drawSelectorOnTop="false"/>
  <Button 
android:id="@+id/StartButton"
    android:layout_width="80px"
    android:layout_height="wrap_content"
    android:text="开始"
  android:layout_x="70px"
  android:layout_y="100px"
    />  
  <Button 
android:id="@+id/StopButton"
    android:layout_width="80px"
    android:layout_height="wrap_content"
    android:text="停止"
  android:layout_x="170px"
  android:layout_y="100px"
    />
</AbsoluteLayout>

List.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/TextView01"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"/>