I'm following a course and when I write btnDatePicker I get an unresolved error:

package com.example.ageinminutes

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)



        btnDatePicker
    }
}

I've being searching on internet and have added a plugin on build.graddle(:app) as seen on diferent solutions:

plugins {
    id 'com.android.application'
    id 'kotlin-android'
    id 'kotlin-android-extensions'
}

but it still doesn't work.

Any help will be appreciated.

CodePudding user response：

kotlin-android-extension is deprecated , you should use viewbinding instead.

Follow this : https://developer.android.com/topic/libraries/view-binding/migration#:~:text=Kotlin Android Extensions is deprecated,migrate to Jetpack view binding.

CodePudding user response：

The answer by @himel is correct. Using kotlin synthetics is discouraged.

However I did notice that the import line for the synthetic view was not in your code. I suggest typing the view manually and importing with Android studio if you want a quick fix