Transforming string to list

Discuss
,
#1

Hi,
I’m having a string with the following structure:
((41.34826 21.55133) (41.34846 21.55111) (41.34864 21.55089))
I want to use this string to draw a polyline but points argument only accepts list.
blocks

I tried to transform this string into a list using:

blocks (1)
blocks (1)707×26 10.2 KB

But it is not working. The error I’m getting is:
java.lang.String cannot be cast to com.google.appinventor.components.runtime.util.YailList

Any help please…
Thx

#2

This format
Your pairs should be like this :
[
{ lat: 37.772, lng: -122.214 },
{ lat: 21.291, lng: -157.821 },
{ lat: -18.142, lng: 178.431 },
{ lat: -27.467, lng: 153.027 },
]

Screenshot_20201008-140641
Screenshot_20201008-140641720×1512 338 KB

#3

Thx, I didn’t know that Get Points from JSON block exist. But i still have problem. I receive error: java.util.ArrayList cannot be cast to java.lang.Number whenever i run this code:

blocks (2)
blocks (2)964×128 9.11 KB

My JSON String data is:
[{ lat: 37.772, lng: -122.214 },{ lat: 21.291, lng: -157.821 },{ lat: -18.142, lng: 178.431 },{ lat: -27.467, lng: 153.027 }]

I can’t find out what i’m doing wrong… :frowning:

#4

Cek this

Or

#5

No extension is required to do this.

#6

Didn’t help either.
But i found the solution:
The JSON format for using the Get Points from JSON component is the following
[[41.34826,21.55133],[41.34846,21.55111],[41.34864,21.55089]]

In this case the polyline is drawing on the screen

121271521_4372463022823718_7328882504349970346_n
121271521_4372463022823718_7328882504349970346_n540×1140 33.3 KB

And here are the blocks:

blocks (4)
blocks (4)1014×128 9.4 KB

#7

Polylines and Makers

Makers taking from the database and polylines made with 2 points after the user makes 2 long clicks on the map

Screenshot_20201010-095737
Screenshot_20201010-095737681×1317 133 KB

#8

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