Android:Compare json data with String - php

Question

I use json to get a string data from php and i want compare this data whit a string ,even when they are equal but returns false for example
php file:
<?php
echo "ok";
?>
java use 3 log
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
page_output = sb.toString();
Log.i("page_output", page_output);
Log.i("page_output", String.valueOf(page_output=="ok"));
Log.i("page_output", String.valueOf(page_output.equals("ok")));
log out
07-12 03:42:45.616: I/page_output(2007): ok
07-12 03:42:45.736: I/page_output(2007): false
07-12 03:42:45.736: I/page_output(2007): false
you can see that page_output is ok but returns false

Answer 1

Try this:
Log.i("page_output", String.valueOf(page_output.trim().equals("ok")));
You are appending "\n" at the end of the every line read from your php response. So you're actually comparing "ok\n" with "ok" and that's why the comparison returns false.
The trim() function removes white spaces, including new lines \n.

Answer 2

in this line:
sb.append(line + "\n");
You add the "\n" new line character to your StringBuilder. When you call toString this character will also be put in your String.
Therefore, page_output.equals("ok\n") will be true.
Or you could just delete the '\n' character from the StringBuilder since I do not see any practical usage in your code