load a PNG file from assets
lazarus / 43-Android

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Dzandaa · 2021-12-29 16:42

Hi everybody,

Trying LAMW on Linux installed yesterday

I try to load a .PNG picture that I put in the assets directory of my
program.

I just have a button and the Click event is:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TAndroidModule1.BLoadClick(Sender: TObject);var  DeskPict
:jBitmap;begin  DeskPict.LoadFromAssets('cards.png');end; 
' = ' of course

Build... OK.

 "Run" -> "[LAMW] Build Apk and Run".. OK.

The APK run fine until I press the button and then crash...

Any idea with example how to load a .PNG file?

The picture size is 468x250

Thank you.

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jmpessoa · 2021-12-29 17:39

Put a jBitmap component on the form ... then

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TAndroidModule1.BLoadClick(Sender: TObject);begin 
 Bitmap1.LoadFromAssets('cards.png');end;

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Dzandaa · 2021-12-29 19:08

Hi,
Thank you jmpessa.

No crash now, but now, I tried to draw part of my .PNG on a
jDrawingView

So I drop a JDrawingView on the Form, Center on Parent with

Height 148 width 116 margins 0
LayoutParamHeight and Width to lpExac

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  Pict:
jDrawingView; procedure TAndroidModule1.BLoadClick(Sender:
TObject);begin  DeskPict.LoadFromAssets('cards.png'); 
Pict.DrawCroppedBitmap(DeskPict, 11, 11, 0, 0, 36, 50); // position on
Pict: 11, 11, draw DeskPict from x=0, y=0, Width=36, Height=50end; 
But I don't know if this is the right thing to do

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jmpessoa · 2021-12-29 19:24

QuoteHeight 148 width 116

This dont work  on android... use only
LayoutParamHeight and LayoutParamWidth

QuotePict: jDrawingView; 

No!!!

Put a jBitmap and a jDrawingView (or jImageView) component on the form
... then

procedure TAndroidModule1.BLoadClick(Sender: TObject);
begin
   Bitmap1.LoadFromAssets('cards.png');
   DrawingView1.DrawCroppedBitmap(Bitmap1.GetImage, ..........);
  //or
   //ImageView1.SetImage(Bitmap1.GetImage);
end;


Please, take a look at the "demos"... so you can learn how LAMW
works....

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Dzandaa · 2021-12-30 11:08

Hi Again,

Working now, I missed the 'GetImage' function

Thank you very much for your help.

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Dzandaa · 2022-01-04 13:49

Hi,

I found that when I load a .PNG picture from asset(size width=468
Height=250)

And I use this code:
Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i  
CardWidth: Integer;  CardHeight: Integer;  CardsPict:
jBitmap; ... CardsPict.LoadFromAssets('cards.png'); CardWidth :=
CardsPict.GetWidth(); CardHeight := CardPict.GetHeight(); 
CardWidth = 250 and CardHeight = 468

Is this normal?