Getting response in android from PHP

Question

I am getting response from php to android, see below .php

 <?php
 $username = $_POST[username];
 $password = $_POST[password];
 if($username == "himm")
 {
if($password == "rangde"){
        echo "success" ;
}
else{
    echo "passwor is wrong.";
}
  }
 else
 {

echo "fail";
  }
  ?>

i am getting success in logcat window of android. But here in android i have made comparison like below,

  BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
  StringBuilder sb = new StringBuilder();
    String line = null;
    while ((line = reader.readLine()) != null) {
           sb.append(line + "\n");
    }
    is.close();
    result = sb.toString();
    Log.v("","Result : "+result);
    Log.v("","this is Result: "+result.equalsIgnoreCase("success"));
    if(result.equals("success")){
        Log.v("","Login successfully......");
}
else{
        Log.v("","Fail to login......");
    }

but in logcat window i see "fail to login" message. Php send response as "success" but which type ? Here condition of if(result.equals("success")) should be true. Please any body give me idea or suggestions to achieve thies..........thank you in advance

You should also see 'result' value in logcat... Which is... ? — Orabîg
– Orabîg, Commented Aug 30, 2012 at 14:01
do you want to authenticate the user of android from php script? — Harshal
– Harshal, Commented Aug 30, 2012 at 14:03
It actually prints success\n. See my answer for a more detailed explanation. — Tom Naessens
– Tom Naessens, Commented Aug 30, 2012 at 14:07

Tom Naessens · Accepted Answer · 2012-08-30 14:05:42Z

1

sb.append(line + "\n"); modifies the 'success' to 'success\n' so the if(result.equals("success")){ fails because 'success\n' does not match 'success'.

answered Aug 30, 2012 at 14:05

Tom Naessens

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5 Comments

Himanshu Over a year ago

sb.append(line + "\n"); result = sb.toString(); i update this statement and after i have pring Log.v("",""+result.equals("success")) but it still get false

Tom Naessens Over a year ago

Yes, \n is still part of the string after the sb.toString() function. toString() does not remove the \n from the string. Try using result = sb.toString().trim().

Himanshu Over a year ago

Log.v("","Result : "+result.trim().equals("success")); it also getting false

Tom Naessens Over a year ago

Modify: result = sb.toString(); to result = sb.toString().trim();. If you only edit the part you pasted in your comment, you won't make any changed to the result variable so it would not be saved if you use the result variable in the if-statement.

Himanshu Over a year ago

ya...........thank you very very much i got it.......thanks again result = sb.toString().trim(); this statement worked.

YohannP · Accepted Answer · 2012-08-30 14:05:46Z

1

In your android code, you add a trailing LineFeed to the result you receive from php :

sb.append(line + "\n");

So you actually compare 'success' to 'success\n' which is false.

answered Aug 30, 2012 at 14:05

YohannP

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3 Comments

njzk2 Over a year ago

to complete the answer, either don't add trailing line feed or String.trim() the result before comparing it.

Himanshu Over a year ago

Log.v("","Result : "+result.trim().equals("success")) also not worked getting false here

Himanshu Over a year ago

it possible by this statement result = sb.toString().trim(); thank you to suggest me......

njzk2 · Accepted Answer · 2012-08-30 14:18:22Z

0

In addition to previously posted answer (which are correct), I would like to point out that HTTP contains mechanisms to do what you are trying to do.

Http authentication allows you to use standard Http return codes (200 in case of success, 401 in case of authentication failure) and to use existing systems to handle that part (most frameworks will provide such).

It also allows you to separate authentication from the rest of the message you send back from the server, and to compare the authentication status at soon as you receive the headers from the server.

answered Aug 30, 2012 at 14:18

njzk2

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