How to initialise view in fragment class in kotlin?

Question

I would like the equivalent code for the line below in Kotlin:

TextView tv = view.findViewbyId(R.id.textView);

Any help?

val textView: TextView = findViewById(R.id.android_text) as TextView — Satan Pandeya, Aug 23 '17 at 11:56

score 3 · Accepted Answer · answered Oct 11 '17 at 14:28

3

very simply, just do following action

val valueName = view!!.findViewById<ObjectName>(R.id.ObjectId)

also with this mark !! kotlin will be checked null state

finally see following example

val btn = view!!.findViewById<Button>(R.id.btn)

answered Oct 11 '17 at 14:28

Saeed

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I think, that's a mistake. If view will be null (it often happens), an application will crash. So, instead of `view!!` it should be written as `view?`. – CoolMind Sep 11 '18 at 06:58

score 2 · Answer 2 · edited Aug 23 '17 at 12:08

2

Why don't you simply use Kotlin Android Binding? Which is an Extension from Kotlin helps to bind the view without any "bindView" or findViewById code to interfere business logic.

Once you have dig into it, you would definitely find it great and less code written afterwards.

Worth to have a look. https://kotlinlang.org/docs/tutorials/android-plugin.html

But you can still use the original one with kotlin

val lblLabel = findViewById(R.id.text) as TextView

edited Aug 23 '17 at 12:08

Vadim Kotov

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answered Aug 23 '17 at 11:54

dwqdq13213

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by far the best answer. – 最白目 May 29 '18 at 13:23

score 1 · Answer 3 · answered Aug 30 '17 at 08:40

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Initialization of view in fragment :

val manageAddress=view.findViewById<TextView>(R.id.textView)

that's it

answered Aug 30 '17 at 08:40

Aniket Indulkar

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score 0 · Answer 4 · answered Aug 23 '17 at 11:55

0

 val tv: TextView = findViewById(R.id.textView) as TextView

if you want to declare textview globally, use lateinit var tv: TextView

answered Aug 23 '17 at 11:55

SARATH V

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score 0 · Answer 5 · answered Aug 23 '17 at 11:56

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like this you can do in kotlin

val lv = findViewById(R.id.textView) as TextView

answered Aug 23 '17 at 11:56

Sunil P

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score 0 · Answer 6 · answered Aug 23 '17 at 12:01

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Kotlin Initialization:

val tv = findViewbyId(R.id.textView) as TextView

Refer here

answered Aug 23 '17 at 12:01

Gowtham Subramaniam

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score 0 · Answer 7 · answered Aug 23 '17 at 12:45

You can use:

val myLabel = findViewById(R.id.text) as TextView

However you can use the Kotlin Android Extensions plugin.

Just add to your build.gradle

apply plugin: 'kotlin-android-extensions'

Then you can avoid the use of the findViewById method just using for example:

textView.text = "My text"

You can access the view without finding it or using third party libraries just using the id assigned in the xml file.

score 0 · Answer 8 · answered Sep 11 '18 at 07:03

If you use Kotlin Android Extensions (apply plugin: 'kotlin-android-extensions', see https://antonioleiva.com/kotlin-android-extensions/), you can write textView and IDE will offer several variants of that view in different layouts. After you choose a right one, you can write something like:

textView.text = "This is a text"

In imports you will see something like import kotlinx.android.synthetic.main.fragment_dialog.*

How to initialise view in fragment class in kotlin?

8 Answers8