Android 数据库打包随APK发布的实例代码

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;

import com.ata.app.R;

/**
 * copy数据库到apk包
 *
 * @author NGJ
 *
 */
public class DataBaseUtil {

 private Context context;
 public static String dbName = "Kao.db";// 数据库的名字
 private static String DATABASE_PATH;// 数据库在手机里的路径

 public DataBaseUtil(Context context) {
  this.context = context;
  String packageName = context.getPackageName();
  DATABASE_PATH="/data/data/"+packageName+"/databases/";
 }

 /**
  * 判断数据库是否存在
  *
  * @return false or true
  */
 public boolean checkDataBase() {
  SQLiteDatabase db = null;
  try {
   String databaseFilename = DATABASE_PATH + dbName;
   db = SQLiteDatabase.openDatabase(databaseFilename, null,SQLiteDatabase.OPEN_READONLY);
  } catch (SQLiteException e) {

  }
  if (db != null) {
   db.close();
  }
  return db != null ? true : false;
 }

 /**
  * 复制数据库到手机指定文件夹下
  *
  * @throws IOException
  */
 public void copyDataBase() throws IOException {
  String databaseFilenames = DATABASE_PATH + dbName;
  File dir = new File(DATABASE_PATH);
  if (!dir.exists())// 判断文件夹是否存在，不存在就新建一个
   dir.mkdir();
  FileOutputStream os = new FileOutputStream(databaseFilenames);// 得到数据库文件的写入流
  InputStream is = context.getResources().openRawResource(R.raw.kao);// 得到数据库文件的数据流
  byte[] buffer = new byte[8192];
  int count = 0;
  while ((count = is.read(buffer)) > 0) {
   os.write(buffer, 0, count);
   os.flush();
  }
  is.close();
  os.close();
 }
}

Java代码 
privatevoid copyDataBaseToPhone() { 
        DataBaseUtil util = new DataBaseUtil(this); 
        // 判断数据库是否存在 
        boolean dbExist = util.checkDataBase(); 

        if (dbExist) { 
            Log.i("tag", "The database is exist."); 
        } else {// 不存在就把raw里的数据库写入手机 
            try { 
               util.copyDataBase(); 
           } catch (IOException e) { 
               thrownew Error("Error copying database"); 
           } 
        } 
    } 

boolean hasSDCard = Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);
  if(hasSDCard){
   copyDataBaseToPhone();
  }else{
   showToast("未检测到SDCard");
  }