Develop Reference

how i can fix databinding error while inflate view

When I normally I app run after building android studio throws this error.
at com.shayan.test.databinding.ActivityMainBinding.inflate(ActivityMainBinding.java:113)
E/AndroidRuntime: at com.shayan.test.MainActivity.onCreate(MainActivity.kt:14)
I think I forget something to do calling method or something
package com.shayan.test
package com.shayan.test
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import com.shayan.test.databinding.ActivityMainBinding
class MainActivity : AppCompatActivity() {
lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(LayoutInflater.from(this))
(binding.root)
}
}

your using viewbinding.. setContentView is missing. and
binding = ActivityMainBinding.inflate(LayoutInflater.from(this))
change to
binding = ActivityMainBinding.inflate(layoutInflater)
Full code for example
class MainActivity : AppCompatActivity() {
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)

Try this methods :
//Try to add in build.gradle (Module:app)
buildFeatures {
viewBinding true
}
2:
Build -> Clean Project
Build -> Rebuild Project
If this method does not help you then It's not about the Gradle file. It is about the XML file.

How to fix error (unresolved reference: editText issue ) in android?

The kotlin-android-extensions Gradle plugin is deprecated. Please use this migration guide to start working with View Binding and the kotlin-parcelize plugin.
C:\\Users\\ADMINISTRATOR\\AndroidStudioProjects\\MyApplication4\\app\\src
\\main\\java\\com\\denizas\\myapplication\\MainActivity.kt: (14, 21):
Unresolved reference: editText
Caused by: org.gradle.api.GradleException:
Compilation error. See log for more details

build.gradle(Module:App)
android {
....
buildFeatures {
viewBinding true
}
}
MainActivity.kt
class MainActivity : AppCompatActivity() {
private var _binding: ActivityMainBinding? = null
private val binding
get() = _binding!!
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
_binding = ActivityChartBinding.inflate(layoutInflater)
setContentView(R.layout.activity_main)
}
fun topla(view: View){
binding.apply {
//in this part it is used to access the views in the layout part
var sayi1 = editText.text.toStirng()
}
}
}

Errors when I create a class in Android Studio

I have this code:
class SignInActivity {
private lateinit var binding: SingInBinding
fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = SingInBinding.inflate(layoutInflater)
setContentView(binding.root)
} // Start GameActivity
}
But I have errors in onCreate, layoutInflater, and setContentView: unresolved reference.
How can I fix it?
I want to fix the problem.

You are not extending any Activity class, you should do something like
class SignInActivity : ComponentActivity() {
...
}

Why does Kotlin Activity have a problem finding Buttons?

Attempting to update an older Android game project to use view binding. Android Studio version 4.1.3. I am thinking my problem has to do with the naming of my binding class.
the xml file is called activity_correct_guess.xml and I am using what I think is the name that gets generated by the view binding: ActivityCorrectGuessBinding. Appreciate and ideas!
The build errors:
Unresolved reference: ActivityCorrectGuessBinding
Unresolved reference: binding
Unresolved reference: binding
In the Gradle build module I have the following:
android {
compileSdkVersion 30
buildToolsVersion "30.0.0"
buildFeatures {
viewBinding = true
}
layout file: activity_correct_guess.xml
<Button
android:id="#+id/btnPlayAgain"
android:layout_width="wrap_content"
..... />
Activity file: CorrectGuessActivity.kt
class CorrectGuessActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val binding = ActivityCorrectGuessBinding.inflate(layoutInflater)
val view = binding.root
setContentView(view)
playAgain()
exitGame()
}
fun playAgain() {
binding.btnPlayAgain.setOnClickListener {
val intent = Intent("com.appkotlin2021v4.MainActivity")
startActivity(intent)
}
}

Typically, you define your view binding in the root of your Activity or Fragment or in an init block:
class CorrectGuessActivity : AppCompatActivity() {
//get to inflating!
private val binding = ActivityCorrectGuessBinding.inflate(layoutInflater)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(binding.root)
playAgain()
exitGame()
}
fun playAgain() {
binding.btnPlayAgain.setOnClickListener {
val intent = Intent("com.appkotlin2021v4.MainActivity")
startActivity(intent)
}
}
The only time you need to "wait to inflate" is when you're in a non-ViewGroup-based class like RecyclerView.Adapter, etc.

Yes, this is the correct way to define the view binding. thank you!

MainActivity.kt doesn't see button's id?

Code:
class MainActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
button3.setOnClickListener { }
}
Screenshot of code with IDE error: link
I haven't idea what the error might be. Reloading and rebuild didn't help.

You're writing your code outside of MainActivity's onCreate (or any other) method scope.
Your code is:
class MainActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
button3.setOnClickListener { }
}
But must be:
class MainActivity: AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
button3.setOnClickListener {
// do something
}
}
}
You can use class-level declaration for methods, inner classes etc, but not for writing code.
And calling views directly by their ids is possible only using Kotlin Android Extensions. Check if you're using it and move your code to the one of methods' scope, and code will works.

All actions must be inside an any function. Your button3.setOnClickListener { } written outside the function.
And when you add apply plugin: 'kotlin-android-extensions' your app.gradle file, widgets can be used directly via ID. Without this you need to declare your btn.

you must go in gradle scripts and select build.gradle(module.....)
and add this line:
( id 'kotlin-android-extensions' )
in plugins {
id 'com.android.application'
id 'kotlin-android'
here
}
and sync now