Android Studio is giving errors and warnings after enabling view binding. How to fix?

Question

I am getting errors after i enabled view binding in my project.

I have tried resyncing the project, invalidating cache. My app gradle file:

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.learning.aboutme"
        minSdkVersion 19
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    viewBinding.enabled = true

}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

My project gradle file

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
     ext.kotlin_version = '1.3.72'
     repositories {
          google()
          jcenter()

     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.6.3'
         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
     }
}

allprojects {
     repositories {
          google()
          jcenter()

     }
}

task clean(type: Delete) {
     delete rootProject.buildDir
}

My activity main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingStart="@dimen/padding"
    android:paddingEnd="@dimen/padding"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/name_text"
        style="@style/name_style"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/name"
        android:textAlignment="center" />

    <EditText
        android:id="@+id/nickname_edit"
        style="@style/name_style"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="@string/name_it_what_is_your_nickname"
        android:inputType="textPersonName"
        android:textAlignment="center" />

    <Button
        android:id="@+id/done_button"
        style="@style/Widget.AppCompat.Button.Colored"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="@dimen/layout_margin"
        android:fontFamily="@font/roboto"
        android:text="@string/done" />

    <TextView
        android:id="@+id/nickname_text"
        style="@style/name_style"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAlignment="center"
        android:visibility="gone" />

    <ImageView
        android:id="@+id/star_Image"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/layout_margin"
        android:contentDescription="@string/yellow_star"
        app:srcCompat="@android:drawable/btn_star_big_on" />

    <ScrollView
        android:id="@+id/bio_scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <TextView
            android:id="@+id/textView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:lineSpacingMultiplier="@dimen/spacing_multiplier"
            android:text="@string/bio"
            android:textColor="@android:color/black" />
    </ScrollView>
</LinearLayout>

Here the android studio gives a warning on android:contentDescription,textAlignment, lineSpacingMultiplier, text etc

Here is my main activity.kt file:

package com.learning.aboutme

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import com.learning.aboutme.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(R.layout.activity_main)
    }

    private fun addNickname(view: View) {

    }
}

Here android studio says: Cannot access android.viewbinding.ViewBinding which is a supertype of com.learning.aboutme.databinding.ActivityMainBinding. On ActivityMainBinding.inflate()

I tried creating a new project and moving my files there but the same errors ( Tried moving activity_main.xml and the same errors.

How to fix this?

Answer 1

For me the error went away when I added

implementation 'com.android.databinding:viewbinding:4.0.1'

to the build.gradle file.

This dependency contains the class android.viewbinding.ViewBinding which AndroidStudio could not access.

Answer 2

In my case the following steps (clearing of cache) did help:

Step 1 : open Terminal and goto your project path in terminal.
Step 2 : Optional Hit this command git clean -xfd or safe variant git clean. Be careful with -xfd this as this removes untracked files and .gitignore files
Step 3 : Goto : File -> Invalidate caches/restart.

Answer 3

Facing same issue exact error yesterday. Solution work for me is

• Step 1- Remove .Idea Folder
• Step 2- Close android studio
• Step 3- Reopen android studio with same project path (This will genarate new .Idea folder)

and Error is gone

Making sure

1. android.useAndroidX=true. inside gradle.properties file
2. inside app build.gradle

 buildFeatures {
       viewBinding true
 }

3. Always Use folder structure with small case latter only class name is allowed to be Uppercase
4. If you are using any Copyright-Comment at top of xml or Layout tag without variable tag or we can say without any data then remove that and try to clean/rebuild project