Andoid: execute sql query from external storage

I have a .sql file with alter Table statements in /sdcard/file.sql i need to execute into sqlite database in my android app using this .sql file.

how could i do this ?

I already have this code:

 public void executeSQLScript(SQLiteDatabase database,String fileName) {
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    byte buf[] = new byte[1024];
    int len;
    AssetManager assetManager = context.getAssets();
    InputStream inputStream = null;

    try{
        inputStream = assetManager.open("sql/"+fileName);
        while ((len = inputStream.read(buf)) != -1) {
            outputStream.write(buf, 0, len);
        }
        outputStream.close();
        inputStream.close();

        String[] createScript = outputStream.toString().split(";");
        for (int i = 0; i < createScript.length; i++) {
            String sqlStatement = createScript[i].trim();
            if (sqlStatement.length() > 0) {
                database.execSQL(sqlStatement + ";");
            }
        }
    } catch (IOException e){
        System.out.println("Fail to load .sql file");
        e.printStackTrace();
    }
}