public class MySqliteHelper extends SQLiteOpenHelper {

?

?private static final String dbName = "/data/data/com.Aladin/databases/aladindb.db";
?private static final String DATABASE_PATH = "/data/data/com.Aladin/databases";
?private static final String DATABASE_FILENAME = "aladindb.db";
?private static int VERSION = 1;
?String databaseFileName = DATABASE_PATH + "/" + DATABASE_FILENAME;
?Context myContext;

?public MySqliteHelper(Context context, String name, CursorFactory factory,
???int version) {
??super(context, dbName, factory, VERSION);
??myContext = context;
??checkDBExists();
?}

?// ===================================================================
?// 根据城市名获得City
?@Override
?public void onCreate(SQLiteDatabase db) {
?}

?

?@Override
?public synchronized SQLiteDatabase getReadableDatabase() {
??checkDBExists();
??if (new File(databaseFileName).exists()) {
???SQLiteDatabase db = SQLiteDatabase.openOrCreateDatabase(
?????databaseFileName, null);
???return db;
??} else {
???return null;
??}
?}

?@Override
?public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
?}

?// ===================================================================
?private void checkDBExists() {
??// 从资源文件中将数据库创建/data/data/com.Aladin/databases/aladindb.db
??// 1,获得路径
??File dir = new File(DATABASE_PATH);
??if (!dir.exists()) {
???dir.mkdir();
??}
??// 2,获得资源文件
??if (!(new File(databaseFileName).exists())) {
???try {
????// 3,读取资源并创建流
????InputStream is = myContext.getResources().openRawResource(
??????R.raw.aladindb);
????FileOutputStream fos = new FileOutputStream(databaseFileName);
????// 4,复制
????byte[] buffer = new byte[8192];
????int count = 0;
????while ((count = is.read(buffer)) > 0) {
?????fos.write(buffer, 0, count);
????}
????// 5,关闭流
????fos.close();
????is.close();
???} catch (NotFoundException e) {
????e.printStackTrace();
???} catch (FileNotFoundException e) {
????e.printStackTrace();
???} catch (IOException e) {
????e.printStackTrace();
???}
??}
?}

?