B4A Library [Lib+Class] CustomGallery

Informatix · Aug 1, 2012

CustomGallery is a very small library (BitmapPlus) and a class (ClsCustomGallery) for B4A v2.0.
Its goal is to display thumbnails in a row, column or grid. It's highly customizable as you can see in the screenshots.

It needs two other libraries: ScrollView2D and Reflection

Tutorial: How they do #2

List of functions:
Initialize(Parent As Object, Left As Int, Top As Int, Width As Int, Height As Int, GalleryStyle As Int, Callback As Object, subTouch As String, subClick As String, subLongClick As String, subScroll As String)
ClearGallery
RemoveColoredBorders(bmpToCrop As Bitmap, Color As Int) As Bitmap
NumberOfThumbnails As Int
ProcessBitmap(SrcBmp As Bitmap) As Bitmap
AddThumbnail(SrcBmp As Bitmap, Tag As Object)
AddFolder(Dir As String, MaxNbFiles As Int)
InsertThumbnailAt(SrcBmp As Bitmap, Position As Int, Tag As Object)
InsertOnTop(SrcBmp As Bitmap, Position As Int, Tag As Object)
InsertFileAt(Dir As String, FileName As String, InsertPosition As Int, Tag As Object)
MoveThumbnail(FromPos As Int, ToPos As Int)
RemoveThumbnailAt(Position As Int)
RemoveThumbnailWithTag(Tag As Object)
GetThumbnailAt(Position As Int) As Panel
GetThumbnailWithTag(Tag As Object) As Panel
JumpTo(Position As Int)
SetLabelInGrid(Thumbnail As Panel, LabelText As String, LabelColor As Int, LabelSize As Int)
LoadDrawable(Name As String) As Object
AddDrawableTo(Thumbnail As Panel, Drawable As Object)

List of options:
BorderColor As Int
BorderSize As Int
ForceColorReduction As Boolean: if true, reduces the bitmap colors and removes the alpha channel to save memory
MinTiltAngle As Int
MaxTiltAngle As Int
AlternateAngle As Boolean: if true, tilt angles are alternately < 0 and > 0
HorizontalOffset As Int: shifts the thumbnails to the right (+) or to the left (-)
VerticalOffset As Int: shifts the thumbnails to the bottom (+) or to the top (-)
PressedDrawable As Object: drawable displayed when a thumbnail is clicked
RescaleOnlyIfBigger As Boolean: if true, the rescaling function is called only if the source image is bigger than the thumbnail
LabelHeightInGrid As Int: height of labels below thumbnails
SizeInGrid As Int: size of thumbnails inside a grid
SizeInPile As Int: size of thumbnails with the pile style
SpaceBetweenThumbnails As Int
StillVisible As Int: if there's an offset, defines the minimum visible size of thumbnails

v1.1: see details here
v1.11: Fixed three minor bugs
v1.2: see details here
v1.3: Fixed a bug and added the ForceColorReduction option
v1.31: Compatible with obfuscation and JellyBean
v1.32: No more warnings with B4A v2.7.
v1.321: Minor change. I added two entries to the Manifest of examples to enable the hardware acceleration and a large heap.

If you want to download the library and the class, you need only the file CustomGallery#1.zip. If you want to run the full demo, download the five files. After unzipping, you should have nineteen images (18 jpg + 1 png) in the Files folder of the demo.

Another demo (with the MediaBrowser library) is available here.

Fred

Informatix · Nov 26, 2014

MarcoRome said:
Hi Informatix, sorry but "old" project was deleted
Anyway if you work with 100 image or more...and click, one, two, ten time.... dont work. You need to restart the app.

You got probably an Out of Memory error but without something to test, I can't help more.

MarcoRome · Nov 26, 2014

Already... anyway thank you Informatix for your support

juanM1 · Jan 20, 2015

Hi Informatix.

In android 5.0.1 y 2, when you scroll to the right or left, fails, not in android 4.2.2

Thanks

Informatix · Jan 20, 2015

The code of this class has no reason to be not compatible with Lollipop so I think it's due to the Scrollview2D library. Check its version. Use only the v1.1 available on this forum.

juanM1 · Jan 21, 2015

Informatix thanks, that was, I had installed the version 2.20 of scrollview2d of 09/01/2013

Informatix · Jan 21, 2015

juanM1 said:
Informatix thanks, that was, I had installed the version 2.20 of scrollview2d of 09/01/2013

This version 2 is a special version originally created for ULV but since version 3 of ULV it is no longer used and has not been updated.

juanM1 · Jan 21, 2015

Ok, thanks

shashkiranr · Feb 8, 2015

Hi All,

I am getting invalid zip while opening the zip files of the latest v1.321. Am i the only one who is facing this.? Kindly let me know.

Regards,
SK

Informatix · Feb 8, 2015

shashkiranr said:
Hi All,

I am getting invalid zip while opening the zip files of the latest v1.321. Am i the only one who is facing this.? Kindly let me know.

Regards,
SK

Probably. You should download it again or use another unzipper.

shashkiranr · Feb 8, 2015

The downloaded file from chrome is not working. tried with other download manager and it worked. thank you Fred

susu · Oct 15, 2015

Hi @Informatix,
Base on your sample #4, I just add this code into Sub Gallery_OnClick(Thumbnail As Panel) to remove thumbnail

B4X:

Sub Gallery_OnClick(Thumbnail As Panel)
    Log("Delete thumbnail " & Thumbnail.Tag)
    MyGallery1.RemoveThumbnailWithTag(Thumbnail.Tag)
End Sub

It works as expected but if I click on the last thumbnail, all other thumbnails will be deleted except the first 3. Could you please explain and guide me how to fix it? Thank you so much.

Ps: I attached the sample code below.

Informatix · Oct 15, 2015

susu said:
Hi @Informatix,
Base on your sample #4, I just add this code into Sub Gallery_OnClick(Thumbnail As Panel) to remove thumbnail

B4X:

Sub Gallery_OnClick(Thumbnail As Panel) Log("Delete thumbnail " & Thumbnail.Tag) MyGallery1.RemoveThumbnailWithTag(Thumbnail.Tag) End Sub

It works as expected but if I click on the last thumbnail, all other thumbnails will be deleted except the first 3. Could you please explain and guide me how to fix it? Thank you so much.

Ps: I attached the sample code below.

You should do that with ULV, not with this class. You would avoid Out of Memory errors. In "My Playground", my first app, I made all the image lists with ULV. You create each row with 3 cells and you put one image per cell.
Concerning the bug that you encounter, it is probably in the MoveInGrid function of the class.

susu · Oct 15, 2015

Thank you very much although I spent 3 days to make a very nice image explorer base on your CustomGallery. It's really hurt to do it again with ULV
Can you tell me which example of ULV that I can refer to?

Informatix · Oct 15, 2015

susu said:
Thank you very much although I spent 3 days to make a very nice image explorer base on your CustomGallery. It's really hurt to do it again with ULV
Can you tell me which example of ULV that I can refer to?

None, but it's pretty easy to do:
A row layout with three cells.
An imageview in each cell.

Jack Cole · Apr 2, 2016

In example #4, I get the following error when I try to scroll.

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setAlpha(int)' on a null object reference
at flm.b4a.scrollview2d.EdgeEffect.draw(EdgeEffect.java:320)
at flm.b4a.scrollview2d.TwoDScrollView.draw(TwoDScrollView.java:2016)
at android.view.View.updateDisplayListIfDirty(View.java:15402)
at android.view.View.getDisplayList(View.java:15424)
at android.view.View.draw(View.java:16194)
at android.view.ViewGroup.drawChild(ViewGroup.java:3709)
at android.view.ViewGroup.dispatchDraw(ViewGroup.java:3502)
at android.view.View.updateDisplayListIfDirty(View.java:15397)
at android.view.View.getDisplayList(View.java:15424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3693)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3672)
at android.view.View.updateDisplayListIfDirty(View.java:15362)
at android.view.View.getDisplayList(View.java:15424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3693)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3672)
at android.view.View.updateDisplayListIfDirty(View.java:15362)
at android.view.View.getDisplayList(View.java:15424)
at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3693)
at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3672)
at android.view.View.updateDisplayListIfDirty(View.java:15362)
at android.view.View.getDisplayList(View.java:15424)
at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:310)
at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:316)
at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:355)
at android.view.ViewRootImpl.draw(ViewRootImpl.java:2890)
at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2684)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2271)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1265)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6945)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:821)
at android.view.Choreographer.doCallbacks(Choreographer.java:606)
at android.view.Choreographer.doFrame(Choreographer.java:576)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:807)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6895)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
** Activity (main) Resume **

Informatix · Apr 2, 2016

Jack Cole said:
In example #4, I get the following error when I try to scroll.

You should use the latest version of ScrollView2D available in this forum.

Jack Cole · Apr 2, 2016

Perfect, that fixed it!

Alberto Iglesias · Apr 20, 2016

Hey Informatix, is possible use your library to choose one photo from gallery like this layout?

Informatix · Apr 20, 2016

Alberto Iglesias said:
Hey Informatix, is possible use your library to choose one photo from gallery like this layout?

I discourage the use of this class as there are better alternatives, e.g. ULV for vertical galleries.

Alberto Iglesias · Apr 20, 2016

OK, do you have some sample with ULV?

please....

B4A Library [Lib+Class] CustomGallery

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