CODEWITHSUNDEEP
androidimagedrawable
Ђорђе Ђашић
Ђорђе Ђашић

Reputation: 121

Android accessing drawable folder

I placed 10 images in drawable folder and I created a custom class which instances are holding an id Integer that should refer it to a image from draw folder. Now I wonder how to set those id-s at once, not one by one. Instead:

object[0].setImage(R.drawable.image1);
object[1].setImage(R.drawable.image2);

I want to do this with loop, but how?

Upvotes: 1

Views: 894

Answers (4)

Carlos Piñán
Carlos Piñán

Reputation: 79

You can create an integer array for the resources:

int resources = [ R.drawable.image1, R.drawable.image2, ...]

And use a bucle to set the resources into your object array.

Upvotes: 0

eldjon
eldjon

Reputation: 2840

Drawable ids as known are generated within static classes of final class R. So just use reflection to read the values of these static attributes. If you want to get the Int ids then use this code:

    for(Field f : R.drawable.class.getDeclaredFields()){
        if(f.getType() == int.class){
            try {
                   int id = f.getInt(null);
                   // read the image from the id
            } catch (IllegalAccessException e) {
               e.printStackTrace();
            } catch (IllegalArgumentException e){
                e.printStackTrace();
            }
        }
    }

Or if you want to search directly by images' names, you might be interested of the name attribute of fields like :

    for(Field f : R.drawable.class.getDeclaredFields()){
        if(f.getType() == int.class){
            try {
                String name = f.getName();
                // rest of the code handling file loading
                } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
            }
        }
    }

Upvotes: 2

Víctor Albertos
Víctor Albertos

Reputation: 8293

Be aware that the size of the view's list should match with the one that holds the ids:

public class HolderIDs {

public List<Integer> _ids;

public HolderIDs() {
    _ids = new ArrayList<Integer>(Arrays.asList(R.drawable.one, R.drawable.two, R.ldrawable.three, R.drawable.four));
}

public List<Integer> getIDs() {
    return _ids;
}

}

//Usage

List<ImageView> views = getYourViews();

List<Integer> ids = new HolderIDs().getIDs();

for (int i = 0; i < ids.size(); i++) {
    View view = views.get(i);
    if (view == null) return;
    int id = ids.get(i);
    view.setBackgroundResource(id);
}

Upvotes: 0

TehCoder
TehCoder

Reputation: 209

Doesn't work as far as I think.

There is code to get a drawable by its name. For example: "image"+myNumber"

Maybe: how to access the drawable resources by name in android

Upvotes: 1

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