Como obter a contagem de linhas no sqlite usando o Android?

Usando DatabaseUtils.queryNumEntries() :

public long getProfilesCount() {
    SQLiteDatabase db = this.getReadableDatabase();
    long count = DatabaseUtils.queryNumEntries(db, TABLE_NAME);
    db.close();
    return count;
}

ou (mais ineficiente )

public int getProfilesCount() {
    String countQuery = "SELECT  * FROM " + TABLE_NAME;
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(countQuery, null);
    int count = cursor.getCount();
    cursor.close();
    return count;
}

Em atividade:

int profile_counts = db.getProfilesCount();
    db.close();