import kotlinx.android.synthetic.main.activity_main is not working

Question

Import kotlinx greyed out

I think i try nearly everything. Reinstall Android Studio, Invalide Cache, new Project same Problem.

i just can't find the Solution

Answer 1

Check "build.gradle(:app)" file,

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

if kotlin extension is missing, add kotlin-android-extensions as shown below and click on "Sync now"

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

Answer 2

Can you try

• File | Invalidate Caches / Restart
• Deleting .idea folder
• Clean
• Re-import the project

OR just remove apply plugin: 'kotlin-android-extensions' , sync gradle plugin and then I added it again.

Answer 3

Just add below line in your build.gradle(Module:YourProjectName.app) inside the plugins section on top:

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

Mostly first two lines are already there just need to add 3rd one and sync project

Answer 4

Here is a step by step answer:

• From right side of the Android studio click on Gradle
• Right click on the app and click Open Gradle Config
• New source opening in plugins part and then add this:

id 'kotlin-android-extensions'

• Tap sync

Result: now you can import kotlinx.android.synthetic.main.activity_main.*

Answer 5

module gradle

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

dependencies {
implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
}

project gradle

buildscript{
ext.kotlin_version = '1.3.11'
}
 dependencies {
  classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}

Answer 6

Synthetics are now deprecated from Google. Try to avoid using them as it might lead to null pointer exceptions and unexpected behaviour on your app.

Read more on:

Migrate from Kotlin synthetics to Jetpack view binding from official developers site.

Answer 7

In build.gradle (:app), add:

    buildFeatures {
        viewBinding true
    }

In MainActivity:

private lateinit var binding: ActivityMainBinding

Modify onCreate:

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)
        setListeners()
    }

To set listeners:

    /**
     * Attaches listeners to all the views.
     */
    private fun setListeners() {
        val clickableViews: List<View> =
            listOf(
                binding.view1,
                binding.view2,
                // ...
            )
        for (item in clickableViews) {
            item.setOnClickListener { ... }
        }
    }

Answer 8

Kotlin Android Extensions is depreciated. Migrate to Jetpack view binding. See below: https://developer.android.com/topic/libraries/view-binding/migration

Answer 9

For me it was just adding the apply plugin: 'kotlin-android-extensions' to app's build.gradle, press sync gradle files and i was able to get synthetics