Android Question Activity.SetBackgroundImage not working on Android 5.1.1

[Arf]

Hi,
I've been testing my app on different platforms - Samsumg S3 phone (android 4.2.2) , Hudl 2 tablet (5.1) and
Nexus 7" (5.1.1).

App works fine on all, but in one of my activities an image does not get loaded and displayed.
I load the layout for the activity, no problems, then do this:

Activity.SetBackgroundImage(LoadBitmap(File.DirAssets, "train.jpg"))

Doesn't load up on the nexus, does on the others.
Nexus resolution: 1920 x 1200 pixels
S3 resolution: 1280 x 720 pixels
Hudl resolution: 1920 x 1200 pixels

The image I am trying to load is 1559 x 2859 pixels and my app works in portait orientation only.

Any ideas? Thanks

 

[Mark Read]

Have you tried "LoadBitmapSample" instead. Maybe you have a memory problem.

 

[Erel]

It works here. Please create a small project that demonstrates this issue and upload it.

 

[Arf]

Thanks.
I have just noticed in the log window that I am getting "Downsampling image due to lack of memory" messages, this is when displaying other images in the app so I guess the same memory shortage is what may be causing the issue above (it is a large image).

I'll try clear the tablet's cache and reboot and see if this helps.

 

[Erel]

I'll try clear the tablet's cache and reboot and see if this helps.

It is not related to the tablet cache.

Make sure not to load any large image. If there are large images then you need to use LoadBitmapSample.

 

[Arf]

Ok. The images I am getting the 'downsample' message for, they are 40kB png's, and there are 28 on the page.
The big image that's not loading in the activity is a 780kB PNG.
So the pictures aren't massive..

 

[Informatix]

Ok. The images I am getting the 'downsample' message for, they are 40kB png's, and there are 28 on the page.
The big image that's not loading in the activity is a 780kB PNG.
So the pictures aren't massive..

The size on the disk does not matter. It's the image resolution. In memory, an image takes width x height x 4 bytes.

 

[Arf]

OK, the big image is working now that I'm using LoadBitmapSample, thanks.

I still have a problem with the smaller, numerous bitmaps. Basically I have an array of 28 buttons that are placed on an activity, and in the designer I allocate a specific bitmap to each button. Think of it as a table of cards, all with the same image (cards back facing up).
Then in my app, another activity loads this card array activity into a panel. From here you can click on a card to turn it over, and at this point I set a new bitmap for the card. There is also a 'try again' button which attempts to clear the panel and repopulate it with its starting position, like this:

Panel1.RemoveAllViews
Panel1.LoadLayout("CardBoard")

It is when the 'try again' button is clicked that I get a slowdown and 'downsampling' messages and an eventual crash.

So, is my strategy of using the designer to allocate the inital image to the buttons not optimal?, or is the way I am trying to re-draw the card board not optimal? I can try use LoadBitmapSample an initialise the images to the buttons programatically after the panel is drawn, and if I do should I just use Button.Width and Button.Height as the arguments for the 'sample' function?

 

[Arf]

I seem to have fixed it now but manually drawing the blank cards to the buttons instead of re-loading the Activity.
Thanks.