Required DataBindingComponent is null in class AgentDetailsActivityBindingImpl

Question

in my agent_details_activity.xml:

 <ImageView
            android:id="@+id/imageViewPhoto"
            android:layout_width="0dp"
            android:layout_height="400dp"
            app:agentImageUrl="@{item.url}"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/toolBarContainer" />

in activity:

class AgentDetailsActivity : AppCompatActivity() {
    private lateinit var binding: AgentDetailsActivityBinding

    companion object {
        val AGENT_DETAILS = AgentDetailsActivity::class.java.name + "_AGENT_DETAILS"
    }

    private val TAG = AgentDetailsActivity::class.java.name

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = AgentDetailsActivityBinding.inflate(layoutInflater)
        setContentView(binding.root)
        binding.setHandler(this);
    }

  @BindingAdapter("agentImageUrl")
    fun loadImage(view: ImageView, imageUrl: String) {
        Glide.with(view.context)
            .load(imageUrl)
            .apply(RequestOptions().error(R.drawable.no_image))
            .into(view)
    }

but in runtime I get error:

Shutting down VM
 FATAL EXCEPTION: main
 Process: com.android.testproject.android.kotlin.debug, PID: 24924
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.testproject.android.kotlin.debug/com.android.testproject.android.kotlin.coroutine_retrofit.ui.activity.AgentDetailsActivity}: java.lang.IllegalStateException: Required DataBindingComponent is null in class AgentDetailsActivityBindingImpl. A BindingAdapter in com.android.testproject.android.kotlin.coroutine_retrofit.ui.activity.AgentDetailsActivity is not static and requires an object to use, retrieved from the DataBindingComponent. If you don't use an inflation method taking a DataBindingComponent, use DataBindingUtil.setDefaultComponent or make all BindingAdapter methods static.
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: java.lang.IllegalStateException: Required DataBindingComponent is null in class AgentDetailsActivityBindingImpl. A BindingAdapter in com.android.testproject.android.kotlin.coroutine_retrofit.ui.activity.AgentDetailsActivity is not static and requires an object to use, retrieved from the DataBindingComponent. If you don't use an inflation method taking a DataBindingComponent, use DataBindingUtil.setDefaultComponent or make all BindingAdapter methods static.
    at androidx.databinding.ViewDataBinding.ensureBindingComponentIsNotNull(ViewDataBinding.java:666)
    at com.android.testproject.android.kotlin.databinding.AgentDetailsActivityBindingImpl.<init>(AgentDetailsActivityBindingImpl.java:40)
    at com.android.testproject.android.kotlin.databinding.AgentDetailsActivityBindingImpl.<init>(AgentDetailsActivityBindingImpl.java:32)
    at com.android.testproject.android.kotlin.DataBinderMapperImpl.getDataBinder(DataBinderMapperImpl.java:52)
    at androidx.databinding.MergedDataBinderMapper.getDataBinder(MergedDataBinderMapper.java:74)
    at androidx.databinding.DataBindingUtil.bind(DataBindingUtil.java:199)
    at androidx.databinding.DataBindingUtil.inflate(DataBindingUtil.java:130)
    at androidx.databinding.ViewDataBinding.inflateInternal(ViewDataBinding.java:1366)
    at com.android.testproject.android.kotlin.databinding.AgentDetailsActivityBinding.inflate(AgentDetailsActivityBinding.java:95)
    at com.android.testproject.android.kotlin.databinding.AgentDetailsActivityBinding.inflate(AgentDetailsActivityBinding.java:81)
    at com.android.testproject.android.kotlin.coroutine_retrofit.ui.activity.AgentDetailsActivity.onCreate(AgentDetailsActivity.kt:37)
    at android.app.Activity.performCreate(Activity.java:6251)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)

Volkslied

bind adapter method must be static – Frias

I wrote a detailed answer below to understand the main reason of this error also provided the possible best solutions there – Kubiak

Answer 1

In my case I found a really simple method, I had the same error as you. I just had to add @JvmStatic annotation.

The code will look something like this:

companion object {

     @JvmStatic // add this line !!
     @BindingAdapter("agentImageUrl")
        fun loadImage(view: ImageView, imageUrl: String) {
            Glide.with(view.context)
                .load(imageUrl)
                .apply(RequestOptions().error(R.drawable.no_image))
                .into(view)
        }
}

Incorporated

Placing the @BindingAdapter method outside any class also works and this one also worked, but this one is more understandable and kotliny solution. Thanks – Cuirbouilli

This is also working fine for me. – Flosser

Answer 2

To elaborate on @mahdi shahbazi answer (The bind adapter method must be static):

In kotlin, place your binding method outside of any class (so in your case oustide of the Activity class). This will do the trick. In your case, it will look like:

@BindingAdapter("agentImageUrl")
fun loadImage(view: ImageView, imageUrl: String) {
    Glide.with(view.context)
        .load(imageUrl)
        .apply(RequestOptions().error(R.drawable.no_image))
        .into(view)
}

class AgentDetailsActivity : AppCompatActivity() {
    private lateinit var binding: AgentDetailsActivityBinding

    companion object {
        val AGENT_DETAILS = AgentDetailsActivity::class.java.name + "_AGENT_DETAILS"
    }

    private val TAG = AgentDetailsActivity::class.java.name

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = AgentDetailsActivityBinding.inflate(layoutInflater)
        setContentView(binding.root)
        binding.setHandler(this);
    }

    ...

}

I have been able to come up with this answer thanks to this article: https://proandroiddev.com/custom-attributes-using-bindingadapters-in-kotlin-971ef8fcc259. There are lots of other good tips in it, I recommend looking into it for yummies about view binding.

Imperialism

if as in my case the binding adapter is supposed to be in the ViewModel, it works to put it outside the class clause too. – Kilmer

Solution worked for me is - place your binding method outside of any class – Thud

Answer 3

Yes, first of all place your binding method outside of any class. Second, make imageUrl nullable! Because if the imageUrl becomes null anytime, you will get crash before onError() is invoked.

@BindingAdapter("agentImageUrl")
fun loadImage(view: ImageView, imageUrl: String?) {
    Glide.with(view.context)
        .load(imageUrl)
        .apply(RequestOptions().error(R.drawable.no_image))
        .into(view)
}

Concision

Answer 4

@BindingAdapter("android:loadImage")
fun loadImage(userImageView: ImageView, imageUrl: String): Unit {
    Glide
        .with(userImageView)
        .load(imageUrl)
        .into(userImageView)
}

This is my solution, I have written my function outside the class

Pforzheim

Answer 5

for me nesting method inside companion object{} and adding @JvmStatic worked.

companion object{
            @JvmStatic
            @BindingAdapter("avatarBinder")
            fun loadAvatar(view: ImageView, avatar: String?):Unit{
                    Glide.with(view.context)
                            .load(avatar).into(view);
            }
    }

Cuirbouilli

Answer 6

1. add this annotation @JvmStatic

2. make all variables nullable

   imageUrl:String will be imageUrl:String?

solution will be

@JvmStatic
@BindingAdapter("agentImageUrl")
fun loadImage(view: ImageView, imageUrl: String?) {
    Glide.with(view.context)
        .load(imageUrl)
        .apply(RequestOptions().error(R.drawable.no_image))
        .into(view)
}

Subtilize

In that case your @BindingAdapter declaration must be in a static field like you should declare them inside companion object – Kubiak

Answer 7

I came across this bug , when I mistakenly added this binderAdapters inside a class.

Flatwise

Answer 8

There are different ways of declaring all @BindingAdapters in a single app. Either they should be declared in any Static field or in any Global Scope like outside of Activity or Fragment file or 😊 you can gather all @BindingAdapters in a single file and make that file DefaultComponent for Data Binding. The last approach is the more architectural way of declaring all @BindingAdapters in a single app.

Let's discuss both approaches here:

Simple way: Create a file anywhere in the project and declare all @BindingAdapters in a single companion object inside that file like following:

companion object {
    @JvmStatic
    @BindingAdapter("agentImageUrl")
    fun loadImage(view: ImageView, imageUrl: String?) {
        Glide.with(view.context)
            .load(imageUrl)
            .apply(RequestOptions().error(R.drawable.no_image))
            .into(view)
    }
}

Do not forget to declare all the @BindingAdapters as @JvmStatic

You can also declare your @BindingAdapters outside of your Activity or Fragment which is a Global Scope, that will also solve the error but there might be a risk that you may write same @BindingAdapter in multiple places in a single project.

Architectural way: This is the best approach to declare all @BindingAdapters in a single project.

1. First create a file and declare a class not companion object in this case and declare all @BindingAdapters inside this class like following:

   class BindingAdapters {
       @BindingAdapter(value = ["imageUrl", "imageRequestListener"], requireAll = false)
       fun bindImage(imageView: ImageView, url: String?, listener: RequestListener<Drawable?>?) {
           Glide.with(imageView.context)
               .load(url)
               .listener(listener)
               .into(imageView)
       }
   }
   

Do not use @JvmStatic in this case

Create another class and extend DataBindingComponent class so that the compiler looks for binding components declaration in this file not elsewhere.

class AppDataBindingComponent : DataBindingComponent {
    private val adapter = BindingAdapters()
    override fun getBindingAdapters() = adapter
}

Finally add this following line inside the onCreate() function of your Application class

DataBindingUtil.setDefaultComponent(AppDataBindingComponent())

Like below:

class MainApplication : Application() {
    override fun onCreate() {
        super.onCreate()
        DataBindingUtil.setDefaultComponent(AppDataBindingComponent())
    }
}

That's it 😊 now you can follow any of the above approach which seems easier to you.

N.B: Do not forget to include your Application file inside your AndroidManifest.xml file like following:

<application
    android:name=".app.MainApplication"
    android:allowBackup="true"/>

Sorry for the long discussion but hope you will learn a lot from this discussion. Thank you

Kubiak