A little help please? I'm having trouble with an i...

# android

[Scott]

A little help please? I'm having trouble with an inner class being able to use a function that is declared in the outer class. Not sure why this is happening because the tutorial I'm doing has the same thing but no error. Here is a simplified version of the code with the failing part pointed out by the comment:

class DAO(){

    fun fetchPicture(){
        // Code...
    }

    inner class InnerClass : AsyncTask<String, Int, Bitmap>() {

        override fun doInBackground(vararg params: String?): Bitmap {
            var network = NetworkingDAO
       // Following line fails with "Unresolved Refereence: fetchPicture"
            network.fetchPicture(picture[0])
        }
    }
}

[vince95]

fetchPicture() is not a function of your network object

[Scott]

You mean the DAO? Sorry, I should have labeled the outer class as being the DAO because it is. Editing that...

[vince95]

so, your fetchPicture belong to your DAO class or your NetworkingDAO class ?

[vince95]

you're defining it in your DAO class, and try to use it with a NetworkingDAO object

[Scott]

yea, sorry I'm really new to this. All of this code is in NetworkingDAO.kt . Here is the actual code, with the irrelevant parts left out:

[Scott]

class NetworkingDAO {
// Irrelevant bits

fun populatePicture(pictureName: String): Bitmap? {
        // Declare the return type
        var bitmap: Bitmap? = null

        // Compose a picture URI
        val pictureURI = URI_DOMAIN + "/photos/mini/$pictureName"
        val URL = URL(pictureURI)
        val inputStream = URL.openConnection().getInputStream()

        if (inputStream != null) {
            bitmap = BitmapFactory.decodeStream(inputStream)
        }

        return bitmap
    }

    inner class GetPhotoTask : AsyncTask<String, Int, Bitmap>() {

        override fun doInBackground(vararg params: String?): Bitmap {
            var network = NetworkingDAO
            network.populatePicture(picture[0])
        }
    }
}

[Scott]

what fails is that last line: network.populatePicture(picture[0])

[vince95]

ok I think i found it

[Scott]

sorry, I had the function duplicated because I was checking somethning... fixed that so that the function is no longer duplicated

[vince95]

what is picture[0] ? I think you meant param[0], to get the first agrgument of your asyncTask

[Scott]

trying that...

[Scott]

"network.populatePicture(params[0])" solves the problem with picture[0] but the call to network.populatePicture(... still fails

[vince95]

what is the error message now

[Scott]

I guess I should have mentioned that the function declaration at the top says that populatePicture is never used... and the error in the call at the bottom is "Unresolved Reference : populatePicture" ... I think it's a case of scope but afaik the call in the inner class should be able to see and use the declared function in the outer class.

[Scott]

But apparently it can't

[Scott]

I actually didn't have the whole inner class in that code but it still doesn't change the error of the Unresolved Reference. Here is the complete inner class:

inner class GetPhotoTask : AsyncTask<String, Int, Bitmap>() {

        override fun doInBackground(vararg params: String?): Bitmap {
            var network = NetworkingDAO
            var bitmap = network.populatePicture(params[0])
            
            return bitmap

        }
    }

[Scott]

Huh... even using super@NetworkingDAO fails

var bitmap = with(network){
                [e-mail](params[0])
            }

[Scott]

Got it... Error Code ID10T: Bug was found in the chair to keyboard interface.

[Scott]

The function call was supposed to be in the main activity file, the picture vs. params was exactly what you said AND I had an issue where I was trying to put a nullable type into a not nullable variable. Thank you for your help!

[Scott]

Actually, for anyone reading this later, it was the entire inner class that was supposed to be in the main activity file.