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Author
Topic: jListView with image (Read 448 times)
xinyiman
Hero Member
Posts: 2256
jListView with image
«
on:
April 06, 2023, 04:05:27 pm »
Someone explain to me how to put in a listview an image (loaded at runtime retrieved from a record in sqlite) aligned left and the text in the center.
I need it to be able to preview a series of products combined with their name. A thousand thanks
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
jmpessoa
Hero Member
Posts: 2302
Re: jListView with image
«
Reply #1 on:
April 06, 2023, 04:35:59 pm »
Hi, xinyiman!
If you can retrieve the image from a record in sqlite....
then you can try some code like theses [events]:
Code: Pascal
[Select]
[+]
[-]
procedure
TAndroidModule1
.
ListView1DrawItemBitmap
(
Sender
:
TObject
;
itemIndex
:
integer
;
itemCaption
:
string
;
out bimap
:
JObject
)
;
begin
if
itemIndex
=
1
then
//only item index = 1 has a image ...
begin
bimap
:
=
ImageFileManager1
.
LoadThumbnailFromAssets
(
'lemur_funny.png'
,
72
,
72
)
;
end
;
end
;
or
Code: Pascal
[Select]
[+]
[-]
procedure
TAndroidModule1
.
ListView1DrawItemWidgetBitmap
(
Sender
:
TObject
;
itemIndex
:
integer
;
widgetText
:
string
;
out bimap
:
JObject
)
;
begin
if
itemIndex
=
1
then
//only item index = 1 has a image ...
begin
bimap
:
=
ImageFileManager1
.
LoadThumbnailFromAssets
(
'lemur_funny.png'
,
72
,
72
)
;
end
;
end
;
«
Last Edit: April 06, 2023, 04:37:37 pm by jmpessoa
»
Logged
Lamw: Lazarus Android Module Wizard
https://github.com/jmpessoa/lazandroidmodulewizard
xinyiman
Hero Member
Posts: 2256
Re: jListView with image
«
Reply #2 on:
April 06, 2023, 04:49:44 pm »
I was thinking of saving images in base64 in text field. How do I then convert them to bitmaps?
Logged
Win10, Ubuntu and Mac
Lazarus: 2.1.0
FPC: 3.3.1
jmpessoa
Hero Member
Posts: 2302
Re: jListView with image
«
Reply #3 on:
April 06, 2023, 05:21:44 pm »
You can try "jBitmap component" methods:
Code: Pascal
[Select]
[+]
[-]
function
GetBase64StringFromImage
(
_bitmap
:
jObject
;
_compressFormat
:
TBitmapCompressFormat
)
:
string
;
function
GetBase64StringFromImageFile
(
_fullPathToImageFile
:
string
)
:
string
;
function
GetImageFromBase64String
(
_imageBase64String
:
string
)
:
jObject
;
// <-- try this!
Logged
Lamw: Lazarus Android Module Wizard
https://github.com/jmpessoa/lazandroidmodulewizard
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