Hi, can someone explain why IntelliJ is giving an ...

# android

[Mirmukhsin Sodikov]

Hi, can someone explain why IntelliJ is giving an error like that?
IntelliJ is saying that Variable mOnClickListener must be initialized and underlines the mOnClickListener inside the init statement.

I have been doing the same thing in Java and it didn’t say anything like that.

Am I missing something here ?

EDIT : I am trying to make a custom layout here. I have been doing this in Java all the time - assigned OnClickListener to a private variable and then setting it to a button in the constructor.

class CustomLayout(context: Context) : FrameLayout(context) {

    companion object {
        const val RESOURCE = R.layout.layout_custom
    }

    init {
        LayoutInflater.from(context).inflate(RESOURCE, this)
        // IntelliJ underlined `mOnClickListener` here and it says : "Variable mOnClickListener must be initialized"
        btnSend.setOnClickListener(mOnClickListener) 
    }

    private val mOnClickListener = OnClickListener { context.toastInfo("Info") }
}

Java version of the code which works fine

public class CustomLayout extends FrameLayout{

     public CustomLayout(){
          // inflating the xml layout
          ...
          btnSend.setOnClickListener(mOnClickListener);
     } 

     private OnClickListener mOnClickListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            // do something
        }
    };  

}

[Adam Powell]

Kotlin runs init blocks and property initializer expressions in order from top to bottom in the class. Move the listener to be above the init block.

[Adam Powell]

And drop the m 🙂

[Mirmukhsin Sodikov]

😮interesting…
thank you pal for the quick reply.

dropping m is gonna be the hardest one for me 😄

[Adam Powell]

If it helps, remember that kotlin has no such thing as raw fields, all properties are backed by real get/set methods (and occasionally they're optimized out). You wouldn't put m in a getter/setter, so you don't need them here

[Mirmukhsin Sodikov]

Hmm, I see it now. Got it.
Got bored in the quarantine and yesterday decided to try some Kotlin. So far loving it. 😍

[secretly copying your message to my secret Kotlin notes]