Question

I am attempting to enter values such as “0.20” within a table but when I display it within an activity it shows “0.2”. I am uncertain as to why the ‘0’ is being removed i.e. incorrect structure of the table, insertion, or being returned.

My table is created as followed:

db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" + KEY_ROWID
                + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_NAME
                + " TEXT NOT NULL, " + KEY_SWIMMERLAPS + " INT NOT NULL, "
                + KEY_SPONSOR + " DEC(4,2) NOT NULL );");

I then insert the data:

public long addSwimmer(String name, String laps, String sponsor) {
    int i = Integer.parseInt(laps);
    ContentValues cv = new ContentValues();
    cv.put(KEY_NAME, name);
    cv.put(KEY_SWIMMERLAPS, i);
    cv.put(KEY_SPONSOR, (new DecimalFormat("0.00##")).format(0.20));
    return ourDatabase.insert(DATABASE_TABLE, null, cv);
}

and then return the sponsorship data:

public String getSwimmerSponsors() {
    String[] columns = new String[] { KEY_SPONSOR };
    Cursor c = ourDatabase.query(DATABASE_TABLE, columns, null, null, null,
            null, KEY_SWIMMERLAPS + " DESC");
    String result = "";

    for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) {
        result = result + c.getString(0) + "\n";
    }
    return result;
}

Edit – I display the returned result in my layout as follows:

String sponsors = swimmerDb.getSwimmerSponsors();
    tvSponsor.setText(sponsors);

Thanks.

Answer 1

Because you’re displaying an unformatted Java variable, and leading/trailing 0s are suppressed.

If you want to format it with a specific layout, use one of the printf/format variants:

printf("%.2f", num); // Etc.