package kr.co.company.audiorecord2;

import java.io.File;import java.io.IOException;import android.app.Activity;import android.media.MediaPlayer;import android.media.MediaRecorder;import android.os.Bundle;import android.os.Environment;import android.util.Log;import android.view.View;import android.widget.Button;public class AudioRecord2Activity extends Activity {	private static final String LOG_TAG = "AudioRecorderTest";	private static String filename = null;	Button play, record;	private MediaRecorder recorder = null;	private MediaPlayer player = null;	@Override	public void onCreate(Bundle icicle) {		super.onCreate(icicle);		setContentView(R.layout.main);		filename = Environment.getExternalStorageDirectory().getAbsolutePath();		filename += "/test.3gp";		play = (Button) findViewById(R.id.play);		record = (Button) findViewById(R.id.record);		play.setOnClickListener(new Button.OnClickListener() {			public void onClick(View v) {				if (player == null) {					player = new MediaPlayer();					try {						player.setDataSource(filename);						player.prepare();						player.start();					} catch (IOException e) {						Log.e(LOG_TAG, "prepare() failed");					}					play.setText("재생 중지");				} else {					player.release();					player = null;					play.setText("재생 시작");				}			}		});		record.setOnClickListener(new Button.OnClickListener() {			public void onClick(View v) {				if (recorder == null) {					recorder = new MediaRecorder();					recorder.setAudioSource(MediaRecorder.AudioSource.MIC);					recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);					recorder.setOutputFile(filename);					recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);					try {						recorder.prepare();					} catch (IOException e) {						Log.e(LOG_TAG, "prepare() failed");					}					recorder.start();					record.setText("녹음 중지");				} else {					recorder.stop();					recorder.release();					recorder = null;					record.setText("녹음 시작");				}			}		});	}	@Override	public void onPause() {		super.onPause();		if (recorder != null) {			recorder.release();			recorder = null;		}		if (player != null) {			player.release();			player = null;		}	}}

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위 소스는 AudioRecordActivity.java의 소스코드이며

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="kr.co.company.audiorecord2"    android:versionCode="1"    android:versionName="1.0" >    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.RECORD_AUDIO"/>    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="kr.co.company.audiorecord2.AudioRecord2Activity"            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></manifest>

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위 소스는 매니페스트 파일 소스코드이고...

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical" android:layout_width="fill_parent"
   android:layout_height="fill_parent">
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="15pt"
        android:autoText="false"
        android:gravity="center_horizontal" />
   <TextView android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:text="녹음 관리"
        android:textSize="30pt"
        android:autoText="false"
        android:gravity="center_horizontal" />
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="15pt"
        android:autoText="false"
        android:gravity="center_horizontal" />
   <Button android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:id="@+id/record"
      android:text="녹음 시작" ></Button>
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="15pt"
        android:autoText="false"
        android:gravity="center_horizontal" />
   <Button android:layout_width="match_parent"
      android:layout_height="wrap_content"
        android:id="@+id/play"
      android:text="재생 시작" ></Button>
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text=""
        android:textSize="10pt"
        android:autoText="false"
        android:gravity="center_horizontal" />

</LinearLayout>

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main 레이아웃의 xml코드입니다..

java쪽은 생 초짜입니다만...

학교에서 안드로이드 앱 개발 프로젝트가 있어서 염치불구하고 질문글 올립니다.

책에서 소스코드를 가져왔으며

1-1. 여기서 저장되는 파일은 어떤 경로로 저장이 되는가?

1-2. sd카드로 저장을 각각 하고싶은데 어떤방법을 취하여야 하는가?

1-3. 파일명은 20151111_xxxxx.xxx같이 언제 녹음했는지 알수있게끔 하는 방법

에 대해 책만보고 무작정 따라하기엔 답이 안나와서 어찌해야할지 방법을 모르겠습니다

방법만이라도 알려주시면 감사하겠습니다 ㅠㅠ