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

Humiliating

github.com/gradle/kotlin-dsl/issues/377 – Crucible

did you convert your project to androidx? To me the issue happened after that. – Hostetler

kotlin-android-extensions is not supported anymore use viewbinding – Canter

Answer 1

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.

Cloistral

i add it to my file but its greyed out and its says "Unused import directive" – Humiliating

Did you try running your app? unused simply mean, it is not used yet, it will be used when you use some id in your class. – Cloistral

that verry weird the import line Disappears when i try to add a id to my class – Humiliating

Thank you so much, i dont know how but now its working – Humiliating

Deleting .idea folder worked for me, I think it started happening because I switch branched and AS didn't know how to go from there – Murrumbidgee

My project compiled, but an IDEA showed an error, I just removed the kotlin-android-extensions -> sync, and added it again and it worked again – Micrometry

Answer 2

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'
}

Champlain

This worked. I think there is a bug on the new Android Studio 4.1 version that excludes extension at project creation. – Macaque

It works for me. Thanks – Csc

This was my answer. Thanks. – Gangrel

Simple solution, thanks. – Justiciar

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

West

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.*

Obedience

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"
}

Barrus

The answer is worked for me (apply plugin: 'kotlin-android-extensions') & after Invalidate Caches / Restart – Exoergic

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.

Graiggrail

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 { ... }
        }
    }

Hairball

Answer 8

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

Witless

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

Manoff

Answer 10

For newcomers to Android world who use JetPack Library:

Kotlin Android Extensions is deprecated, which means that using Kotlin synthetics for view binding is no longer supported. If your app uses Kotlin synthetics for view binding, use this guide to migrate to Jetpack view binding. If your app doesn't already use Kotlin synthetics for view binding, see View binding for basic usage information.

From Migrate from Kotlin synthetics to Jetpack view binding documentation

To insert plugins in app:build.gradle as

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

isn't necessary anymore and does not work.

STEP 1.

Instead you must insert this implementation in the app:build.gradle file:

android {
    ...
    buildFeatures {
        viewBinding = true
    }
}

Examples: Setup instruction by developer.android.com, Sean McQuillan's Blog setup instruction in Android 3.6 and Android 4.0, Github ViewBindingSample given by developer.android.com

STEP 2

To bind the .xml layout to the main activity program (ex: MainActivity.kt) you must proceed like the following in the acitivity .kt file :

private lateinit var binding: ResultProfileBinding

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ResultProfileBinding.inflate(layoutInflater)
    val view = binding.root
    setContentView(view)

    binding.labelWeight.text = "weight (lbs)" // a TextView in the layout
}

If you have a layout called activity_awesome.xml, which contains a button and two text views, view binding generates a small class called ActivityAwesomeBinding that contains a property for every view with an ID in the layout.

From McQuillan's blog

So here ResultProfileBinding is the id binding of the layout result_profile_binfind.xml. Snake case is converted to Pascal case for .xml layout name, and Camel case for views present in the .xml layout (ex: TextView android:id="@+id/label_weight in the layout will give binding.labelWeight in the activity program) .

Madder

Answer 11

Simple friend, you forgot the asterisk.

    import kotlinx.android.synthetic.main.activity_main.*

It just happened to me.

Hew

Answer 12

id 'kotlin-android-extensions'
id 'kotlin-android'

remove plugins and added them two of them. id 'kotlin-android-extensions' id 'kotlin-android'

should be added. restart the project.

So the problem as I have found is in gradle plugins, then you need to restart, rebuild your project.

Intercession

Answer 13

Hope this help... maybe is related with the new way to get views from layouts

Kotlin:

1. open gradle app.module and add this line inside

   android{

    android{viewBinding.enabled = true
    ...
   
    }
   

(then sync)

2. go to MainActivity.kt and do this:

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

val binding = ActivityMainBinding.inflate(layoutInflater) // 2.1

setContentView(binding.root) // 2.2 instead of (R.layout.activity_main)

now views are called this way

binding.btn1.setOnClickListener{...}

or

binding.txtviewTitle.text = "Welcome to the jungle" // or any R.string

note: after you sync the gradle module.app with the line you will find any activity with the same name+Binding

Look 2.1 reference

Peskoff

Answer 14

buildscript {
    ext.kotlin_version = '1.3.72'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip

Edyth

Answer 15

I solved my problem in this manner: in build.gradle and in plugins add id 'kotlin-android-extensions' after some seconds when I write the name of button, automatically import kotlinx.android.synthetic.main.activity_main.* imported to code

Piddock

Answer 16

as android document says Kotlin Android Extensions is deprecated, which means that using Kotlin synthetics for view binding is no longer supported. If your app uses Kotlin synthetics for view binding, use this guide to migrate to Jetpack view binding. Migrate from Kotlin synthetics to Jetpack view binding

Pallaten

Answer 17

In my case I was missing in module's gradle file:

androidExtensions {
  experimental = true 
}

Summerwood

Answer 18

in my case i applied all above solutions but didn't work and then i just added following line in menifest and it is working fine.

package="com.your.package"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:dist="http://schemas.android.com/apk/distribution"
   package="com.your.package"
    >

Congo

Answer 19

this fixed it for me :

1. Put this into your app.iml

<facet type="kotlin-language" name="Kotlin"> <configuration version="3" platform="JVM 1.8" allPlatforms="JVM [1.8]" useProjectSettings="false"> <compilerSettings /> <compilerArguments> <option name="jvmTarget" value="1.8" /> <option name="pluginOptions"> <array> <option value="plugin:org.jetbrains.kotlin.android:enabled=true" /> <option value="plugin:org.jetbrains.kotlin.android:defaultCacheImplementation=hashMap" /> </array> </option> </compilerArguments> </configuration> </facet>

2. Do gradle sync

Purgatorial