Question

My app needs to download a database from a link, heres the code I use to download the database adn save it on the sd card:

public void DownloadBD() {
    try {
        URL url = new URL(
                "http://mylink/dbHandler.axd?SqliteDbVersion=0");

        HttpURLConnection urlConnection = (HttpURLConnection) url
                .openConnection();

        urlConnection.setRequestMethod("GET");
        urlConnection.setDoOutput(true);
        urlConnection.connect();

        File SDCardRoot = Environment.getExternalStorageDirectory();
        File file = new File(SDCardRoot, "DirLaguna.db");

        FileOutputStream fileOutput = new FileOutputStream(file);

        InputStream inputStream = urlConnection.getInputStream();

        int totalSize = urlConnection.getContentLength();
        int downloadedSize = 0;

        byte[] buffer = new byte[1024];
        int bufferLength = 0;
        while ((bufferLength = inputStream.read(buffer)) > 0) {
            fileOutput.write(buffer, 0, bufferLength);
            downloadedSize += bufferLength;
        }
        fileOutput.close();
        location = file.getAbsolutePath();
    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

Everything seems to work fine, but at the moment I want to query the database (I’m using raw querys) an error appears saying that the tables don’t exist.

After that, I tried debugging the application, and after that I get the error saying that the database is corrupted. I think that the downloading process is what is making the database corrupt.

Any help will be apreciated, if I’m missing some code to share please tell me so!

Thanks in advance!

Answer 1

1) The database you are downloading is sqlite database?

2) If yes, then you need to copy that in your application before you start using it.

The process will be something like you download the database in your Sd Card and as soon as its completed start copying it into your application so as it becomes part of your application, like this: http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/

Make this happen in background by separate thread and then you are good to go and use it. Let me know if you face any problem or issue or I didn’t provided you info what you meant.

Thanks