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

问题

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

回答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.

回答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'
}

回答3:

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"
}

回答4:

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

回答5:

Simple friend, you forgot the asterisk.

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

It just happened to me.

回答6:

this fixed it for me :

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>

Do gradle sync

回答7:

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.

回答8:

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.