Step-1: 首先將.mp3檔案放入Project的/res/raw/裡，如下：
程式一開始執行，建立一個資料庫，含有BLOB欄位，如下之指令：
sql = "create table mySong("
+ "song_no text not null,"
+ "song_mp3 blob );";
try {
} catch (sqlException e) {
Log.e("ERROR",e.toString());
return;
}
Step-2: 從Project讀取*.mp3歌曲，然後分段儲存到sqlite的BLOB裡，如下之指令：
InputStream is = getResources().openRawResource(rid);
int bufSize = 63*1024;
byte[] buffer = new byte[bufSize];
try {
int size = is.read(buffer);
while(size >= 0){
ByteArrayOutputStream out = new ByteArrayOutputStream(size);
out.write(buffer,size);
out.flush();
out.close();
cv.put("song_mp3",out.toByteArray());
db.insert("mySong",null,cv);
size = is.read(buffer);
}
} catch (IOException e) {
Log.e("ERROR",e.toString());
}
Step-3: 從sqlite的BLOB裡，讀取歌曲並存入
/data/data/com.misoo.SQ01/files/song.mp3，
如下之指令：
FileOutputStream os = null;
try{
os = openFileOutput("song.mp3",MODE_WORLD_READABLE);
} catch(FileNotFoundException e){
Log.e("ERROR",e.toString());
}
byte[] red_buf;
//----------------------------------------
mOpenHelper = new DatabaseHelper(this);
sqliteDatabase db = mOpenHelper.getReadableDatabase();
String col[] = {"song_no","song_mp3" };
cur = db.query("mySong",col,cond,null);
int k =0;
cur.moveToFirst();
try{
while(!cur.isAfterLast()){
red_buf = cur.getBlob(1);
os.write(red_buf);
k++;
cur.moveToNext();
}
os.flush();
os.close();
}catch(Exception e){
Log.e("ERROR",e.toString());
return;
}
Step-4: 使用MediaPlayer將
/data/data/com.misoo.SQ01/files/song.mp3，
播放出來，如下之指令：
String path = "/data/data/com.misoo.SQ01/files/song.mp3";
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(path);
mPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mPlayer.start();
}
其實，BLOB欄位可儲存很大的資料量，在本範例裡，刻意將歌曲切成許多段，逐一存入資料庫裏。其目的只是為了舉例而已。
package com.misoo.SQ01;
import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlException;
import android.database.sqlite.sqliteDatabase;
import android.database.sqlite.sqliteOpenHelper;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
public class ac01 extends Activity implements OnClickListener{
private static final String DB_NAME = "mp3Song.db";
private static final int DB_VERSION = 2;
private Button btn,btn2,btn3;
private Cursor cur;
private MediaPlayer mPlayer;
private static class DatabaseHelper extends sqliteOpenHelper {
DatabaseHelper(Context context) {
super(context,DB_NAME,DB_VERSION);
}
@Override
public void onCreate(sqliteDatabase db) {
}
@Override
public void onUpgrade(sqliteDatabase db,int oldVersion,int newVersion) {
}
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
LinearLayout layout = new LinearLayout(this);
layout.setOrientation(LinearLayout.VERTICAL);
btn = new Button(this);
btn.setId(101);
btn.setText("play");
btn.setBackgroundResource(R.drawable.heart);
btn.setOnClickListener(this);
LinearLayout.LayoutParams param
= new LinearLayout.LayoutParams(80,50);
param.topMargin = 10;
layout.addView(btn,param);
btn2 = new Button(this);
btn2.setId(102);
btn2.setText("stop");
btn2.setBackgroundResource(R.drawable.heart);
btn2.setOnClickListener(this);
layout.addView(btn2,param);
btn3 = new Button(this);
btn3.setId(103);
btn3.setText("exit");
btn3.setBackgroundResource(R.drawable.heart);
btn3.setOnClickListener(this);
layout.addView(btn3,param);
setContentView(layout);
setTitle("Saving into sqliteDB...");
//---------------------------------
init();
setTitle("Saved in sqliteDB.");
}
private DatabaseHelper mOpenHelper;
public void init(){
mOpenHelper = new DatabaseHelper(this);
sqliteDatabase db = mOpenHelper.getWritableDatabase();
//-----------------------------------
String sql = "drop table mySong";
try {
} catch (sqlException e) {
Log.e("ERROR",e.toString());
}
//-----------------------------------
sql = "create table mySong("
+ "song_no text not null,"
+ "song_mp3 blob );";
try {
} catch (sqlException e) {
Log.e("ERROR",e.toString());
return;
}
//---------------------------------
SaveOneSong(db,"s01",R.raw.den_li_guing);
}
public void SaveOneSong(sqliteDatabase db,String key,int rid){
ContentValues cv = new ContentValues();
cv.put("song_no",key);
InputStream is = getResources().openRawResource(rid);
int bufSize = 63*1024;
byte[] buffer = new byte[bufSize];
try {
int size = is.read(buffer);
while(size >= 0){
ByteArrayOutputStream out = new ByteArrayOutputStream(size);
out.write(buffer,size);
out.flush();
out.close();
cv.put("song_mp3",out.toByteArray());
db.insert("mySong",cv);
size = is.read(buffer);
}
} catch (IOException e) {
Log.e("ERROR",e.toString());
}
}
public void play(String cond){
FileOutputStream os = null;
try{
os = openFileOutput("song.mp3",MODE_WORLD_READABLE);
} catch(FileNotFoundException e){
Log.e("ERROR",e.toString());
}
byte[] red_buf;
//----------------------------------------
mOpenHelper = new DatabaseHelper(this);
sqliteDatabase db = mOpenHelper.getReadableDatabase();
String col[] = {"song_no","song_mp3" };
cur = db.query("mySong",null);
int k =0;
cur.moveToFirst();
try{
while(!cur.isAfterLast()){
red_buf = cur.getBlob(1);
os.write(red_buf);
k++;
cur.moveToNext();
}
os.flush();
os.close();
}catch(Exception e){
Log.e("ERROR",e.toString());
return;
}
String path = "/data/data/com.misoo.SQ01/files/song.mp3";
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(path);
mPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mPlayer.start();
}
public void onClick(View v) {
switch (v.getId()) {
case 101:
String cond = "song_no='s01'";
play(cond);
break;
case 102:
stop();
break;
case 103:
stop();
finish();
break;
}
}
public void stop() {
if (mPlayer != null) {
mPlayer.stop();
mPlayer.release();
mPlayer = null;
}
}
}
