CODEWITHSUNDEEP
androidvariableskotlinarraylistcopy
Somendra Meena
Somendra Meena

Reputation: 149

Create separate ArrayList from Application variable in kotlin android

I'm trying to make a copy of List<> from a variable declared in Application class object. Problem for me is that I'm unable to make a separate copy. Any update which I do on second variable also updates the application variable. Below is the code I'm using:

var app: MyApplication
private var taskItems: ArrayList<TaskItem>? = null

override fun onCreate(savedInstanceState: Bundle?) {
    app = applicationContext as MyApplication
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    taskItems = app.selectedTask?.items!!
}

fun updateCount(idx: Int, quantity: Int){
    taskItems?.get(idx)?.count = quantity
    // This updates both taskItems and app.selectedTask.items
    // I want to update only taskItems variable
}

I only want to update the taskItems variable from function updateCount() and not the app variable app.selectedTask.items. I've tried following changes in onCreateView function:

Try1:

taskItems= ArrayList<TaskItem>(app.selectedTask?.items!!)

Try2:

taskItems= ArrayList()
taskItems!!.addAll(app.selectedTask?.items!!)

Try3:

taskItems= ArrayList()
for (item in app.selectedTask?.items!!) {
    taskItems!!.add(item)
}

But none of the above code worked for me. Any help is really appreciated.

Upvotes: 1

Views: 166

Answers (1)

shafayat hossain
shafayat hossain

Reputation: 1129

Try following code:

taskItems= ArrayList()
app.selectedTask?.items!!.forEach {
    taskItems.add(it.copy())
}

Upvotes: 2

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