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Krzysztof Paz
7,361 PointsCodeChallenge in Build a Blog Reader Android App - Getting Data from the Web - Parsing Data Returned in JSON Format
Hi, I'm in 3rd step of Build a Blog Reader Android App - Getting Data from the Web - Parsing Data Returned in JSON Format - codeChallenge 3/3 task of: "Finally, write a 'for' loop that loops through 'jsonBooks'. In each step of the loop, use 'getJSONObject(int index)' to get a JSONObject from the array. Then use the 'Log.i()' method (with "CodeChallenge" as the tag) to write the book title, a comma, a space, and the number of pages. Ex. output: 'Book title 1, 300'."
and I have no clue what is wrong with my code, that makes it not passing as expected, but just giving the message: "Bummer! Make sure you write each book to the log exactly as specified in the instructions."
// JSONObject 'jsonData' was loaded from data.json
String name = jsonData.getString("name");
String publisher = jsonData.getString("publisher");
String language = jsonData.getString("language");
JSONArray jsonBooks = jsonData.getJSONArray("books");
for (int i = 0; i < jsonBooks.length(); i++)
{
JSONObject book = jsonBooks.getJSONObject(i);
String title = book.getString("title");
String pages = book.getString("pages");
Log.i("CodeChallenge", title+", "+pages);
}
Could you please advise, how to make it right?
Krzysztof Paz
7,361 PointsOk, I've found the Ben's trap ;-)
Just change the pages variable to Integer and use the getInt for it as well, then it goes like it should.
String name = jsonData.getString("name");
String publisher = jsonData.getString("publisher");
String language = jsonData.getString("language");
JSONArray jsonBooks = jsonData.getJSONArray("books");
for (int i = 0; i < jsonBooks.length(); i++)
{
JSONObject book = jsonBooks.getJSONObject(i);
String title = book.getString("title");
int pages = book.getInt("pages");
Log.i("CodeChallenge", title+", "+pages);
}
Regards, Kris.
Peter LABORDE
2,124 PointsThanks!
Of course, getInt in order to get an integer! I was not seeing the answer. I had set the variable as int but kept using getString. I can now go to sleep ready to try the next steps of the code.
Cheers,
Randell
Dan Giles
2,243 PointsGood catch Krzysztof; thanks! I was banging my head against my keyboard wondering why this wasn't working.
Note that leaving it as 'book.getString("pages")' should also work if used in actual code, since the JSONObject will coerce the int into a String for this method return. From http://developer.android.com/reference/org/json/JSONObject.html:
"When the requested type is a String, other non-null values will be coerced using valueOf(Object)"
2 Answers
Nick Pettit
Treehouse TeacherLooks like this post is figured out! :) I'm just answering in the answer box so that this post doesn't appear in the "unanswered" section of the forum anymore.
When answering posts, be sure to reply in "Answer" section so that you can get points for it!
kevin cloinger
11,492 PointsThnaks
Peter LABORDE
2,124 PointsPeter LABORDE
2,124 PointsI am having the exact same problem. I keep getting the error message "Make sure you write each book to the log exactly as specified in the instructions."
my code:
for (int i = 0; i < jsonBooks.length(); i++){ JSONObject jsonBook = jsonBooks.getJSONObject(i); String title = jsonBook.getString("title"); String pages = jsonBook.getString("pages"); Log.i("CodeChallenge", title + ", " + pages);