viewBinding is not working with error (Android studio 4)

Question

I make android application with kotlin by Android studio 4 (4.11).

findViewById is deprecated in Androd Studio 4 ,then I use viewBinding. https://developer.android.com/topic/libraries/view-binding

But viewBinding is not working with error.

(path)/MainActivity.kt: (6, 31): Unresolved reference: ActivityMainBinding

Can someone tell me the reason for the error or my mistake?

code is below.

build.grade:

  android {
  ...
// <-- added
    buildFeatures {
        viewBinding = true
    }
// -->
  }

res/layout/activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/viewText" // added.
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.myapplication

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle

private lateinit var binding: ActivityMainBinding // added. <== error (6:31)

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

// <-- added.
        binding = ActivityMainBinding.inflate(layoutInflater)
        val view = binding.root
        binding.textView.text = "Test view binding."
// -->

        setContentView(R.layout.activity_main)
    }
}

Why are you trying to add the binding field outside of the activity — EpicPandaForce, Mar 19 '21 at 10:28

Kewi · Answer 1 · 2021-08-26T18:26:06.123

I was also receiving a data binding error when building my project with view bindings enabled. This question and some of the answers may be useful for anyone having this issue with Arctic Fox + Java 11. After upgrading, I changed the compile options in the app build.gradle entry to:

    sourceCompatibility JavaVersion.VERSION_11 
    targetCompatibility JavaVersion.VERSION_11
//Required if using new Java 11 language features in your project

I was receiving an error: package not found (*.databinding) and thought that view bindings were not being generated. After trying numerous remedies and finding the generated bindings, I came across the above question. Since I am not using any of the new language features in my project, I changed the compile options in the build.gradle back to:

compileOptions {
     sourceCompatibility JavaVersion.VERSION_1_8
     targetCompatibility JavaVersion.VERSION_1_8
}

Rebuilt the project and the bindings were all back with no compile errors.

As per teralser's answer, "this issue has been fixed and landed in BB canary 8. It is specific to Java 11".

For devices running Android 4.0 (API level 14) or higher with Android Gradle Plugin 3.0.0+, adding the Java 8 compile options as per link may solve your issue.

score 9 · Answer 2 · answered Dec 08 '20 at 06:09

9

One of these might help

Rebuild project (Build->Rebuild Project)
File -> Invalidate Chaches -> Invalidate and Restart

answered Dec 08 '20 at 06:09

Farees Hussain

181
1
6

1

Yeah always this. View Binding seems especially screwy, and if you rename anything you definitely have to rebuild – cactustictacs Dec 08 '20 at 09:16
Thanks for the great tip. Glad to see it's not just Xcode that still has bizarre quirks :) – Fattie Jun 17 '22 at 16:22
2023 and this is still a problem to Android Studio, Rebuild or Invalidate Restart will fix it. Thanks – ralphgabb May 31 '23 at 03:24

Vishwanath Pandey · Answer 3 · 2021-03-19T10:11:03.900

4

Do this:- binding = ActivityMainBinding.inflate(layoutInflater)

    val view = binding.root
    
    setContentView(view)  or setcontentview(binding.root)

    binding.textView.text = "Test view binding."

it should work.

edited Mar 19 '21 at 10:11

answered Mar 19 '21 at 06:58

Vishwanath Pandey

121
2
5

score 1 · Answer 4 · answered Sep 14 '21 at 10:33

1

Just replace:

setContentView(R.layout.activity_main)

with:

setContentView(binding.root)

Passing your layout separately will inflate the second layout without any view bindings.

answered Sep 14 '21 at 10:33

Ugre

11
1

score 0 · Answer 5 · answered Apr 17 '22 at 14:32

0

More easy solve. Broke the xml. Set space in id or not close tag. ViewBinding recreate broken xml and return xml to correct state.

answered Apr 17 '22 at 14:32

Igor Arny

21
2

score 0 · Answer 6 · edited Apr 23 '23 at 16:45

0

1.Add this in build.gradle (module: app):

In android braket:

buildFeatures {
  viewBinding = true
}

2.In your Java file create binding variable

ActivityMainBinding binding;

In OnCrete() do like this:

binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());

Hope this work :)

edited Apr 23 '23 at 16:45

Tyler2P

2,324
26
22
31

answered Apr 13 '23 at 06:00

Goro

1
2

score -1 · Answer 7 · answered Mar 24 '21 at 07:31

-1

Very easy to solve. Create a copy of the layout you are applying on the window and use this copied layout from now on, solved.

answered Mar 24 '21 at 07:31

Zeeshan

357
1
8

score -1 · Answer 8 · answered Jun 15 '21 at 17:00

-1

change the setContentView(R.layout.activity_main) with setContentView(view) or setContentView(binding.root)

answered Jun 15 '21 at 17:00

nesnes

171
1
2

viewBinding is not working with error (Android studio 4)

8 Answers8