Android读取数据库

String databaseFilename = DATABASE_PATH + "/" + DATABASE_NAME;

    File dir = new File(DATABASE_PATH);

    if (!dir.exists())

     dir.mkdir();

    if (!(new File(databaseFilename)).exists()) {

     InputStream is = context.getResources().openRawResource(R.raw.jobexam);

     FileOutputStream fos = new FileOutputStream(databaseFilename);

     byte[] buffer = new byte[8192];

     int count = 0;

     while ((count = is.read(buffer)) > 0) {

      fos.write(buffer, 0, count);

     }

     fos.close();

     is.close();

    }

    db = SQLiteDatabase.openOrCreateDatabase(databaseFilename, null);