Android Question How Do You Pass A Variable From a Php Script to an Activity

[Mahares]

In the php script I have:
<?php
$User="b4auser";
$Password="12345%";
?>

In the Activity, I want to extract those 2 values from the script:
Dim strUser as String = the corresponding value from php script which is b4auser
Dim strPwrd as String = the corresponding value from php script which is 12345%

Thank you

 

[Reviewnow]

Don't know much about php but someone posted this today maybe it will help you.
https://www.b4x.com/android/forum/threads/http-login-example-using-httputils2.50038/

 

[NJDude]

In order to do that, you will have to send a request to the PHP and get the response, your PHP must have a "echo $user . "+" . $password;" (that's of course a very crude sample but you get the idea).

You can use the HTTP lib or HTTPUtils to achieve that.

 

[DonManfred]

Like @NJDude already stated you need to do a httputilscall to the script and the script need to return the values

$res = array();
$res["resultcode"] = 0;
$res["user"] = $user;
$res["password"] = $password;
echo json_encode($res);

 

[Mahares]

Thank you guys for holding my hand as my Php knowledge is virtually nill. I get a string from the Php like this:

{"user":"b4auser ","password":"12345%"}

But the parsed string shows the map values reversed. b4auser should display first before 12345%. Am I taking the right approach here or am I way behind the curve still. Thank you.

Dim m As Map
                m.Initialize
                m=parser.NextObject   
                For i=0 To m.Size-1
'                  Log(i & ": " & m.GetKeyAt(i) & "=" & m.GetValueAt(i))
                    Log(m.GetValueAt(i))
               Next
                Dim v0,v1 As String
                v0= m.GetValueAt(0) :Log(v0)  'displays:  12345%
                v1= m.GetValueAt(1) :Log(v1)  'displays:  b4auser

 

[NJDude]

Don't use the values but the KEY names, that way you can get 'username' and 'password'.

 

[DonManfred]

I get a string from the Php like this:

it is a json string.
Call http://basic4ppc.com:51042/json/index.html and insert the string in the upper left box and click parse

in return you get a code to parse this

Dim parser As JSONParser
parser.Initialize(<text>)
Dim root As Map = parser.NextObject
Dim password As String = root.Get("password")
Dim user As String = root.Get("user")

 

[Mahares]

@DonManfred: That is a great tool, the json tree. It worked quite well. Thank you.
@NJDude: I am not sure what you wanted me to do. I did the below and got the same reversed result as before, Thank you:

For i=0 To m.Size-1
                    Log(m.Get(m.GetKeyAt(i)))
               Next
                Dim v0,v1 As String
                v0= m.Get(m.GetKeyAt(0)) :Log(v0)  'displays:  12345%
                v1= m.Get(m.GetKeyAt(1)) :Log(v1)  'displays:  b4auser

 

[KMatle]

You can write m.get("password") to get 12345%. You don't need m.Get(m.GetKeyAt(0)).

Thats the meaning of a map. Put keys & value pairs in it and get it back by the key

 

[RandomCoder]

NJDude was suggesting to do it exactly the same way Manfred has demonstrated.

@KMatle won me to the post

 

[Mahares]

Thats the meaning of a map. Put keys & value pairs in it and get it back by the key

I am familiar with maps, but what puzzles me is,why are the values reversed when I use the map code I used, although the json tree explained by @DonManfred solved my problem: How can you change the code I have here without going through the jason tree and give me the correct values in the correct order?

Dim m As Map
m.Initialize
m=parser.NextObject
For i=0 To m.Size-1
Log(m.GetValueAt(i))
Next
Dim v0,v1 AsString
v0= m.GetValueAt(0) :Log(v0) 'displays: 12345%
v1= m.GetValueAt(1) :Log(v1) 'displays: b4auser

 

[NJDude]

Mahares, the order of the items in a map (in this case holding a JSON string) are not necessarily always in order, that's why you have to parse them.

 

[DonManfred]

the order of entries in a json map is not garanteed due to some native jsonparsing thingy
Access the values like in the json-example and you are fine. Dont relay on a specific order.

 

[Mahares]

@DonManfred and @NJDude:
Ok, that is what I wanted to hear: the order of the variables is not reliable. Therefore, how would you parse the json string without the use of a tree, by simply using a map in this case or are we out of luck?
Thank you

 

[DonManfred]

in this case the "1st array" in the json is a map. So you just can use it, sure.

 

[Mahares]

in this case the "1st array" in the json is a map. So you just can use it, sure.

Please take a look at the json string:
{"user":"b4auser ","password":"12345%"}
But the map code I use displays 12345% before it displays b4auser . If I am relying exclusively on the map code of the first array and assume the Json tree is not available, why are the values reversed?

 

[DonManfred]

why are the values reversed?

like i already stated. The ORDER inside a JSON is NOT garanteed. The jsonparser does create a map out of the json-array. And this map then also does not have a garanteed order.

 

[DonManfred]

If you know that there is a user and a password inside the map but you dont know the order.
Use a list with user and password and while iterating through that list you get the correcpondending key from the map.