Question

I’m downloading a database from a website. The downloaded database is called db.php
and it’s going to be stored at data/data/my.package.name/files under the name FishingMatey.db. The database is in the filesystem from the DDMS and I can open it on the PC in SQLite Studio. There my database is filled with the right tables and the right data. Here’s my code to download the SQLite database:

public boolean downloadDatabase() {
    try {
        // Log.d(TAG, "downloading database");
        URL url = new URL("http://myurl.com/db.php");

        // Open a connection to that URL */
        URLConnection ucon = url.openConnection();

        // Define InputStreams to read from the URLConnection
        InputStream is = ucon.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(is);

        // Read bytes to the Buffer until there is nothing more to read(-1)
        ByteArrayBuffer baf = new ByteArrayBuffer(50);
        int current = 0;
        while ((current = bis.read()) != -1) {
            baf.append((byte) current);
        }

        // Convert the Bytes read to a String
        FileOutputStream fos = null;
        // Select storage location
        fos = this.context.openFileOutput(DATABASE_NAME, Context.MODE_PRIVATE);

        fos.write(baf.toByteArray());
        fos.close();
    } catch (IOException e) {
        Log.e("downloadDatabase", "downloadDatabase Error: ", e);
        return false;
    } catch (NullPointerException e) {
        Log.e("downloadDatabase", "downloadDatabase Error: ", e);
        return false;
    } catch (Exception e) {
        Log.e("downloadDatabase", "downloadDatabase Error: ", e);
        return false;
    }
    return true;
}

My problem: I can open the database with
SQLiteDatabase db = SQLiteDatabase.openDatabase("/data/data/com.example.menuswitcher/files/" + DATABASE_NAME, null, SQLiteDatabase.OPEN_READONLY);, but if I enter db.query(DATABASE_TABLE_Bewirtschafter, null, null, null, null, null, null); I receive the following error:

01-08 19:52:22.366: E/AndroidRuntime(6157): FATAL EXCEPTION: main
01-08 19:52:22.366: E/AndroidRuntime(6157): android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1

Here’s how I call it in the Activity:
this.b3.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            DBAccess dbAccess = new DBAccess(HauptmenueActivity.this, 1, "FishingMatey.db");
            if (dbAccess.downloadDatabase()) {
                dbAccess.initDatabase();
                Cursor cur = dbAccess.createBewirtschafterAllCursor();
                Log.v("b3", cur.getString(cur.getColumnIndex("name")));
            } else {
                Log.e("b3", "Error!");
            }
        }
    });

Does anybody know why this doesn’t work?

Answer 1

android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1

This error means that you forgot to call cursor.moveToFirst() before trying to read your Cursor.

Cursor cursor = db.query(DATABASE_TABLE_Bewirtschafter, null, null, null, null, null, null);
if(cursor.moveToFirst()) {
    // Do something with the first row, if it exists
}