How can I loop over an array of sets/maps with varying data types-CodePudding

I want to make it so that I keep my code dry and create 3 (or more, or less) buttons with somewhat the same structure. So I create a list of objects to loop over and put the data inside the object to use in several places in the AppButton.

I might think a bit too Pythonic, because that's my main language and I only recently started using Kotlin. What I normally do in Python:

app_buttons = [
    dict(
        text="....",
        icon="....",
        uri_string="....",
    ),
    ...
]

I've tried something similar in Kotlin with mapOf:

val appButtons = arrayOf(
    mapOf(
        "title" to getString(R.string.app_btn_example1),
        "icon" to R.drawable.ic_some_icon_1_64,
        "uriString" to "myapp://example1",
    ),
    ...
)

and then loop over them and getting from the map:

for (entry in appButtons) {
    buttons.add(
        AppButton(
            entry.get("text"),
            entry.get("icon"),
        ) {
            val intent = Intent(Intent.ACTION_VIEW, Uri.parse(entry.get("uriString"))).apply {
                val name = getString(R.string.saved_account_key)
                putExtra(name, sharedPref.getString(name, null))
            }
            startActivity(intent)
        }
    )
}

But then I get Type mismatch. Required String. Found {Comparable & java.io.Serializable}?. I don't know what types to put where...

Ok different approach, using setOf and destructuring:

val appButtons = arrayOf(
    setOf(
        getString(R.string.app_btn_example1),
        R.drawable.ic_some_icon_1_64,
        "myapp://example1",
    ),
    ...
)

for ((text, icon, uriString) in appButtons) {
    buttons.add(
        AppButton(
            text,
            icon
        ) {
            ...
        }
    )
}

But now I get the following:

Destructuring declaration initializer of type Set<{Comparable<*> & java.io.Serializable}> must have a 'component1()' function

Destructuring declaration initializer of type Set<{Comparable<*> & java.io.Serializable}> must have a 'component2()' function

Destructuring declaration initializer of type Set<{Comparable<*> & java.io.Serializable}> must have a 'component3()' function

How do I make this work? How do I create a basic list of objects and loop over them with the correct types? It feels so simple in Python. I'm clearly missing something.

CodePudding user response：

Rather than using maps, you should create a data class. For example:

data class ButtonModel(
     val title: String,
     val icon: Int,
     val uriString: String,
)

You can then create the array like this:

val appButtons = arrayOf(
    ButtonModel(
        title = getString(R.string.app_btn_example1),
        icon = R.drawable.ic_some_icon_1_64,
        uriString = "myapp://example1",
    ),
    ...
)

Or without the parameter labels if you prefer:

val appButtons = arrayOf(
    ButtonModel(
        getString(R.string.app_btn_example1),
        R.drawable.ic_some_icon_1_64,
        "myapp://example1",
    ),
    ...
)

Then, rather than getting them with get or [], you can just use the dot syntax:

buttons.add(
    AppButton(
        entry.text,
        entry.icon,
    ) {
        val intent = Intent(Intent.ACTION_VIEW, Uri.parse(entry.uriString)).apply {
            val name = getString(R.string.saved_account_key)
            putExtra(name, sharedPref.getString(name, null))
        }
        startActivity(intent)
    }
)