Converting an int array of Drawable images to a string array of their filenames

Question

I'm using SharedPreferences to save an array of Drawables as Int (which is later used to set setImageResource)

There's some logic I need to perform on SharedPreferences that requires me to get the actual filename, NOT the Int representation of the drawable.

My code is the following:

val imagesFromSaved = PrefsContext(context).savedLocations

imagesFromSaved prints the following:

[2131135903, 2131165414, 2134135800, 2131765348]

I need to be able to print the actual filename. Like this.

["image_one", "image_two", "image_three", "image_four"]

The closest I got was using getString with one single Int. But I'm not sure how to iterate over all the items in the array to convert everything to the string representation.

val test = context.resources.getString(2131135903)

Prints: res/drawable-nodpi-v4/image_one.webp

How can I iterate over my SharedPreferences to generate an array of Drawable filenames, instead of the Int representation of the resource?

You want the resources.getResourceEntryName() function instead. — Mike M.
– Mike M., Commented Dec 29, 2021 at 1:17
@MikeM. Would I just use a for loop to create the new array of Strings from imagesFromSaved? — Joe
– Joe, Commented Dec 29, 2021 at 5:03
Sorry, I didn't realize the loop was part of the unknown. Sergey's got a proper example in their answer below. — Mike M.
– Mike M., Commented Dec 29, 2021 at 10:36

Sergio · Accepted Answer · 2021-12-29 06:58:04Z

1

To iterate through int array and convert them to strings you can use map function:

val imagesFromSaved = PrefsContext(context).savedLocations
val imagesNames: List<String> = imagesFromSaved.map {
    context.getResources().getResourceEntryName(it)
}

map transforms the list of objects to a list of objects of another type. The resulting imagesNames should contain the names of images.

answered Dec 29, 2021 at 6:58

Sergio

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Lenoarod · Accepted Answer · 2021-12-29 02:44:02Z

0

According to your description, I suggest you should do as follows:

firstly, save the str which is your description fileName
Then get the fileName from sp
In the end, you have to use the str to generate the drawable id

//get the R.draw.fileName,it result is fileName
val fileName = context.getResources().getResourceEntryName(R.drawable.arrow_back)

// then use SharedPreferences get the  str, To generate ID
val id = context.getResources().getIdentifier(fileName, "drawable", context.getPackageName());

// then use the id in imageView
imegeView.setImageResource(id)

edited Dec 29, 2021 at 2:44

answered Dec 29, 2021 at 2:28

Lenoarod

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1 Comment

Joe Over a year ago

Thanks for answering. Looks like I just need to simply convert my array of Int to a string array using the getResourceEntryName function. Trying to work on that now.

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