CODEWITHSUNDEEP
android
user2882662
user2882662

Reputation: 535

What does RHS of this code statement do?

ListView listView = (ListView) findViewById(R.id.listview);

It would be understandable for me if it was something like 

ListView listView = new ListView()

But I don't understand what the RHS of ListView listView = (ListView) findViewById(R.id.listview) means; I know that LHS creates a reference variable named listView which will contain the reference to an object of ListView.

To the best of my understanding, is it retrieving a view by findViewById() and parsing to a ListView object (how can an object of one type be even parsed into an object of another type) , and then assigning a reference to that ListView object in listView reference variable? Thank you in advance.

Upvotes: 0

Views: 176

Answers (1)

Maulik Sheth
Maulik Sheth

Reputation: 574

R.id.listview

here in one of your xml layouts you name a list as "listview"

android assigns id to every name you allot. id are stored in R java file it would be like

public static final int listview=0x7f050002;

even you could directly use this int value in place of R.id.listview

findViewById(R.id.listview);

this will tell your activity to find a view (whose id is stored as R.id.listview)

(listview)

you are casting your view as a LISTVIEW object

and assigning it to the

listView

object of class ListView

Upvotes: 1

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