In my Android project, I want to loop through the entire collection of Drawable
resources. Normally, you can only retrieve a specific resource via its ID using something like:
InputStream is = Resources.getSystem().openRawResource(resourceId)
However, I want to get all Drawable
resources where I won't know their ID's beforehand. Is there a collection I can loop through or perhaps a way to get the list of resource ID's given the resources in my project?
Or, is there a way for me in Java to extract all property values from the R.drawable
static class?
Okay, this feels a bit hack-ish, but this is what I came up with via Reflection. (Note that resources
is an instance of class android.content.res.Resources
.)
final R.drawable drawableResources = new R.drawable();
final Class<R.drawable> c = R.drawable.class;
final Field[] fields = c.getDeclaredFields();
for (int i = 0, max = fields.length; i < max; i++) {
final int resourceId;
try {
resourceId = fields[i].getInt(drawableResources);
} catch (Exception e) {
continue;
}
/* make use of resourceId for accessing Drawables here */
}
If anyone has a better solution that makes better use of Android calls I might not be aware of, I'd definitely like to see them!