Android:Compare json data with String

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

lik this page_output.equals("ok") but not change returns false | Log.i("page_output", String.valueOf(page_output.equals("ok"))); -> 07-12 03:23:35.936: I/page_output(1820): false — sadegh
– sadegh, Commented Jul 12, 2015 at 7:41

Karim · Accepted Answer · 2015-07-12 08:08:06Z

3

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.

answered Jul 12, 2015 at 8:08

Karim

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Comments

TmKVU · Accepted Answer · 2015-07-12 08:08:33Z

1

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

answered Jul 12, 2015 at 8:08

TmKVU

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