Develop Reference

How to show SVG string as an Image in Xamarin?

So the simple idea is that I have SVG data as a string that I fetch from Internet.
I would like to show that as an icon in my app. Is there any way I can do this?
I have seen countless examples where SVG data is in a file located in the app's directory that is then showed but this is not what I am looking for. I literally have the data in XML format after http request and I only need to transform that to a Image or something else visible on the screen.
I have been trying to find a solution to this for hours now, so I would really appreciate some help :S

Android doesn't support svg with ImageView directly,you could display SVG with some commonly used third-party controls.
Like FFImageLoading.
Add Xamarin.FFImageLoading.Svg nuget package to platform project. Use ImageService with svg data resolver for displaying svg images.
For Android:
<ImageView
android:id="#+id/image_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
then use like:
var svgString = #"<svg><rect width=""30"" height=""30"" style=""fill:blue"" /></svg>";
ImageView imageView = FindViewById<ImageView>(Resource.Id.image_view);
ImageService.Instance
.LoadString(svgString)
.LoadingPlaceholder(placeHolderPath)
.WithCustomDataResolver(new SvgDataResolver(64, 0, true))
.WithCustomLoadingPlaceholderDataResolver(new SvgDataResolver(64, 0, true))
.Into(imageView);

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

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.

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);

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);

The following code snippet solves the issue:
int id = getResources().getIdentifier("XXX", "drawable", getPackageName());
imageView.setImageResource(id);

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

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);

Android - png resource converted to a ColorDrawable on android < 4.0

According to documentation here, A png resource should be converted to a BitmapDrawable. However I'm observing a strange behavior wherein a png file which has only black pixels in it is resulting in a crash because of ClassCastException (wrapped in InvocationTargetException) if I try to do the following in a Custom View's constructor :
...
tempDrawable = typedArr.getDrawable(R.styleable.CustomView_src); // Source points to a png file
Log.i("TestPNGToResource", "Canonical Class Name " + tempDrawable.getClass().getCanonicalName());
tempBitmap = ((BitmapDrawable) tempDrawable).getBitmap();
...
I see the following logged on android 2.2 and 2.3
09-24 13:21:37.575: I/TestPNGToResource(532): Canonical Class Name android.graphics.drawable.ColorDrawable
Why is the resource not being converted to a BitmapDrawable?

This is an optimization performed by aapt. It is able to recognize images made of a single color and turn them into, well, a single color instead of a bitmap. This is more space-efficient, improves loading times, etc.

i assume this won't occur for 9-patch images, right? also, when using the image file, will extracting the apk file still show the image file inside it?
anyway, i'm not sure if that helps, but have you tried to check this value:
TypedValue value = a.peekValue(R.styleable.CustomView_src);
then , if it's any of the color types, you can create your own drawable with this color. problem is how to get the size if that's what you get.
however, if in the special case you've shown, you get a reference type, you can probably force it to be BitmapDrawable by just creating the bitmap using BitmapFactory.decodeResource().

How to Set Background Image from asset folder in android?

I am facing problem while setting the backGround Image of LinearLayout from asset folder.
String filePath="file:///android_asset/images/test.png";
Drawable d = Drawable.createFromPath(filePath);
frontTextView.setBackgroundDrawable(d);
Can someone help me out.

First you create a Drawable object from the asset file:
Drawable d = Drawable.createFromStream(getAssets().open(path_in_assets), null);
and then set it to some View that only supports Drawables as a background.

As far as I'm aware, you cannot access assets directly like you are trying to. You'll need to use the AssetManager class to get at your data if you want to store it as an asset. Here's a pretty decent blog post explaining a bit about resources and assets, though the official documentation is also a good resource, of course.
I'll also add, though, that things like background images are typically best stored in res/drawable and accessed using the R.drawable.* style (the blog post linked above also discusses this) whenever possible. It's not really clear why you need to do it this way from your provided code sample, though, so I suppose that's ultimately your call.

EDIT: added create image from InputStream...
I had the similar problem using ImageButton. I figured it out by loading bitmap from assets and using it as image for ImageButton. Probably not a good approach, but is working and solved my problem - unability to have subfolders in drawable dir and not allowed characters in file names.
(Yes, I can use prefix instead of subdir, and rename files to match the pattern (lowercase only and numbers) and I probably will do it later.)
InputStream is = null;
try {
is = this.getResources().getAssets().open("Images/Fruits/Apple.png");
} catch (IOException e) {
Log.w("EL", e);
}
Bitmap image = BitmapFactory.decodeStream(is);
ImageButton ib2 = (ImageButton) findViewById( R.id.imageButton2);
ib2.setImageBitmap( image);

Set image / background source dynamically

is there any possibility to set background image dynamically?!
I try to explain what I mean.
String picVariable = getPictureFromServer();
ImageView image = (ImageView)v.findViewById(R.id.dynamic_image);
// I know, that doesn't work, but that's the way I looking for
image.setBackgroundResource(picVariable);
Thank you in advance,
Mur
Ps.
I also read this article. It would suggested in one answer, to use java reflection to get a field of the R class by name. But I've never used reflextion before. An example would be very helpfull

Sometimes I should take a bit more time for searching :)
I found the answer reading this article, and it works fine for me:
// The server says, it should be *.png
String picName = getPictureFromServer();
picName = picName.replace(".png", "");
Resources r = getResources();
int picId = r.getIdentifier(picName, "drawable", "com.mypackage.myapp");
ImageView image = (ImageView)v.findViewById(R.id.dynamic_image);
image.setBackgroundResource(picId);

ImageView does not have any background, but for other widget (like Button), you should use setBackgroundResource(int).
Sorry, I am not sure I read the question correctly... maybe your problem is just that you are trying to use it with a Widget that does not use background ?