How to change the ImageView source dynamically from a string? (Xamarin Android)

Question

I'm using Xamarin Android and I'm trying to change the ImageView src dynamically. All the pictures are placed in Resource/drawable. After reading the picture name as string from an xml (string imgName = nameFromXml + ".jpg") I would like to passing it to my ImageView. I guess there are two good ways:

1) Get the image (int)id and passing it to the ImageView using SetImageResource(): myTextView.SetImageResource(????????);

2) Get the Uri of the of the Image

EDIT
Unfortunately I couldn't use Eric answer for QuinDa question because there are many methods not existing on Xamarin Android, working just in Android.

Possible duplicate of [Find drawable by string](http://stackoverflow.com/questions/13351003/find-drawable-by-string) — Mike M., Oct 08 '16 at 23:22

score 9 · Answer 1 · edited Oct 08 '16 at 23:57

9

Here is the standard Android method:

int resImage = getResources().getIdentifier(imgName , "drawable", getPackageName());
myTextView.setImageResource(resImage);

Please note that imgName variable must not contain file extension.

Xamarin.Android C#:

int resImage = Resources.GetIdentifier(imgName, "drawable", PackageName);

edited Oct 08 '16 at 23:57

SushiHangover

73,120
10
106
165

answered Oct 08 '16 at 23:32

Romuald Leroux

135
6

Yes, I've already tryied this way but `resImage` is always 0. – Masciuniria Oct 09 '16 at 12:19
1

I've found another way: `int resourceId = (int)typeof(Resource.Drawable).GetField("myImageName").GetValue(null);` then, just: `imageView.SetImageResource(resourceId);` – Masciuniria Oct 09 '16 at 12:28
I have also noticed that the image does not get picked up when the name contains a capital letter, make sure all the text is lowercase. – Christo Nel May 22 '18 at 07:33
and what if we have 2 drawables with the same name and different extension? we can have an image.jpg and an vector image.xml – CDrosos Feb 22 '20 at 09:34

score 4 · Answer 2 · answered Oct 09 '16 at 12:36

Thanks to SushiHangover and Romuald for their answer, but I'd like to share another way that I tested and it looks working well.

Here's how I get the id of the resource:

int resourceId = (int)typeof(Resource.Drawable).GetField("myImageName").GetValue(null);

So, then I'm able to use the normal SetImageResource():

imgViewCondition.SetImageResource(resourceId);

score 2 · Answer 3 · edited Dec 12 '16 at 09:29

2

The following code snippet solves the issue:

int id = getResources().getIdentifier("XXX", "drawable", getPackageName());
imageView.setImageResource(id);

edited Dec 12 '16 at 09:29

Barry Michael Doyle

9,333
30
83
143

answered Dec 12 '16 at 08:12

Monika Aggarwal

49
3

score 2 · Answer 4 · edited May 10 '18 at 21:34

2

Just this:

FindViewById<ImageView>(Resource.Id.imageviewName).SetImageResource(Resource.Drawable.nameofimage);

edited May 10 '18 at 21:34

Rilcon42

9,584
18
83
167

answered May 10 '18 at 17:46

Juan

31
1

score 2 · Answer 5 · answered Nov 06 '19 at 11:52

I know it's an old question, but it never hurt to help.

The image should be stored in all the proper sizes for android inside the Resources Folder (drawable-hdpi, drawable-ldpi ....)

and then you get it dynamically like so

imageView.SetImageResource(Resource.Drawable.YourImageNameHere);

How to change the ImageView source dynamically from a string? (Xamarin Android)

5 Answers5