Android Question How can i make a simple scrollable picture activity ?

GMan · Jul 16, 2016

Hoi Friends,

how (means with which lib or View) can I make a scrollable list of pictures ?
Zooming would be nice, but is no "must have"

Thx in advance

DonManfred · Jul 16, 2016

The simplest is a ListView
Customlistview more advanced possibilities
But you should use a Recycling view... You will fast run into Memory problems when using lot of images

GMan · Jul 16, 2016

Hoi Manfred,
Thx for that - i read about the memory problem but there a only these some pictures, which i will scale down, too

GMan · Jul 16, 2016

I used a listview, but the pics are very small.
Is there a way to Zoom when touching OR displaying the Picx larger ?
Here it my code so far for 3 Pics:

B4X:

    ListViewFoto.AddTwoLinesAndBitmap("PFLASTERARBEITEN", "Beispiel 1", LoadBitmap(File.DirAssets,"1.jpg"))
     ListViewFoto.AddTwoLinesAndBitmap("PFLASTERARBEITEN", "Beispiel 2", LoadBitmap(File.DirAssets,"2.jpg"))
      ListViewFoto.AddTwoLinesAndBitmap("PFLASTERARBEITEN", "Beispiel 3", LoadBitmap(File.DirAssets,"3.jpg"))

klaus · Jul 16, 2016

You can define the dimensions for the entries, but the same for all entries

B4X:

ltvTest.TwoLinesAndBitmap.ItemHeight

ltvTest.TwoLinesAndBitmap.Label.Left
ltvTest.TwoLinesAndBitmap.Label.Top
ltvTest.TwoLinesAndBitmap.Label.Width
ltvTest.TwoLinesAndBitmap.Label.Height

ltvTest.TwoLinesAndBitmap.SecondLabel.Left
ltvTest.TwoLinesAndBitmap.SecondLabel.Top
ltvTest.TwoLinesAndBitmap.SecondLabel.Width
ltvTest.TwoLinesAndBitmap.SecondLabel.Height

ltvTest.TwoLinesAndBitmap.ImageView.Left
ltvTest.TwoLinesAndBitmap.ImageView.Top
ltvTest.TwoLinesAndBitmap.ImageView.Width
ltvTest.TwoLinesAndBitmap.ImageView.Height

You must define this before you add any entry.

GMan · Jul 16, 2016

Thx a lot U2 - works like a charm ;-)
But looks like...not what i wanted.
The .Text1. appears in white (not good)
The .Text2. appears in black (good)

So, (nearly i'd wrote HTF ;-) ) how can i change the color to black, too ?

klaus · Jul 16, 2016

ltvTest.TwoLinesAndBitmap.Label.TextColor = Colors.Black
Label and SecondLabel are Labels with all their properties.

Erel · Jul 17, 2016

Check this example: https://www.b4x.com/android/forum/t...ore-when-scroll-tot-bottom.35761/#post-210230
It loads more items when the user scrolls the list. You should do something like this to avoid loading all images.

GMan · Jul 17, 2016

Thx U2 ;-)
on some devices (depending on the RAm i think) the App hung when calling the picture gallery.
So i simply reduced the amount of pics and placed a link to the Web-picture gallery.
The external browsers can handle that better i think, too

ilan · Jul 17, 2016

u could us the ULV from informatix for that or maybe this lib https://www.b4x.com/android/forum/threads/library-b4agallery-v3-55.24963/

or this https://www.b4x.com/android/forum/threads/lib-class-customgallery.20082/#content

Android Question How can i make a simple scrollable picture activity ?

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