Android Question json help

tufanv · Dec 19, 2016

Hello

I have a json retrieved from remote web

B4X:

{"time":{"updated":"Dec 19, 2016 12:30:00 UTC","updatedISO":"2016-12-19T12:30:00+00:00","updateduk":"Dec 19, 2016 at 12:30 GMT"},"bpi":{"USD":{"code":"USD","rate":"791.3488","description":"United States Dollar","rate_float":791.3488},"TRY":{"code":"TRY","rate":"2,770.3276","description":"Turkish Lira","rate_float":2770.3276}}}

I got this with httpjob and used the code below :

B4X:

Dim parser As JSONParser
parser.Initialize(res)
dim m as map = parser.nextobject

log m gives me :

B4X:

    time = "(read only map) {\n    updated = \"Dec 19, 2016 12:34:00 UTC\";\n    updatedISO = \"2016-12-19T12:34:00+00:00\";\n    updateduk = \"Dec 19, 2016 at 12:34 GMT\";\n}";
}
{"time":{"updated":"Dec 19, 2016 12:34:00 UTC","updatedISO":"2016-12-19T12:34:00+00:00","updateduk":"Dec 19, 2016 at 12:34 GMT"},"bpi":{"USD":{"code":"USD","rate":"791.0175","description":"United States Dollar","rate_float":791.0175},"TRY":{"code":"TRY","rate":"2,770.3276","description":"Turkish Lira","rate_float":2770.3276}}}
code":"TRY","rate":"2,770.3276","description"

How can i retrieve the "rate_float" from this map ? m.get("rate_float") is not working.

TY

Mahares · Dec 20, 2016

KMatle said:
This is just a map inside a map -> brackets {} = maps. So let's follow this thought:

Nice tutorial.

tufanv said:
in case someone needs in the future , I solved id with the code below :

Here is an alternate solution to your case. Use a list to sort the keys. It is NOT necessarily better than yours. It just avoids date manipulations:

B4X:

Dim MyList As List
    MyList.Initialize
    Dim parser As JSONParser
    parser.Initialize(res)
    Dim root3 As Map = parser.NextObject
    Dim bpi As Map = root3.Get("bpi")
    For i=0 To bpi.Size-1
        MyList.Add(bpi.GetKeyAt(i))
    Next
    MyList.Sort(True)
    For i=0 To MyList.Size-1
        Log(bpi.Get(MyList.Get(i)))  'the values will be displayed by ascending dates
    Next

Erel · Dec 21, 2016

Note that you should avoid using GetKeyAt. It is deprecated, not cross platform compatible and can cause performance issues (if the map is very large).

B4X:

For Each o As Object In bpi.Keys
 MyList.Add(o)
Next

KMatle · Dec 21, 2016

Erel said:
Note that you should avoid using GetKeyAt

Good to know

Mahares · Dec 21, 2016

Erel said:
Note that you should avoid using GetKeyAt. It is deprecated, not cross platform compatible

It is becoming apparent that many keywords, methods, properties, etc. are or will be deprecated for the sake of cross platform compatibility or other reasons, namely GetKeyAt. Is it possible for @Erel to create a new sub forum or section to deal with it and point us there. I do not think it is enough to search for 'deprecated'. I have a feeling some day 'Cursor' may also be deprecated for the benefit of 'Resultset' if we are heading toward cross platform compatibility.

Erel · Dec 21, 2016

1. GetKeyAt / GetValueAt will never be removed. You can continue to use them. They were added before the For Each iterator was available to allow iterating over the Map items. The For Each iterator is better in this case.
2. Cursor is not deprecated.

I plan to add a warning for deprecated methods. There are very few deprecated methods in B4A (maybe 5 methods).

KMatle · Dec 21, 2016

Erel said:
Note that you should avoid using GetKeyAt. It is deprecated

Erel said:
GetKeyAt / GetValueAt will never be removed

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