我有一个带有菜单的工具栏，它的最后包含一个自定义按钮，我想根据片段在视图页导航中的位置更改此按钮的文本。但是当我调用BindingAdapter中使用的函数showButtonText时，它不会被调用
我已经在文本视图中使用了这种方式，它已经工作了，但是在给定菜单中的自定义按钮没有。
我的代码：

• • BindingAdapter：**

@BindingAdapter("app:showButtonText")
fun showButtonText(buttonView: Button, resId: Int?) {
    buttonView.text = resId?.let(buttonView.context::getString)
        ?: buttonView.context.getString(R.string.next)
}

• • 自定义按钮xml：**

<?xml version="1.0" encoding="utf-8"?>
<layout 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">

    <data>

        <variable
            name="viewModel"
            type="com.cupcake.jobsfinder.ui.create_job.CreateJobViewModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <Button
            android:id="@+id/next_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:backgroundTint="@color/background"
            android:elevation="0dp"
            android:stateListAnimator="@null"
            **app:showButtonText="@{viewModel.jobUiState.titleToolBar}"**
            android:textColor="@color/primary"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:textAllCaps="false"
            tools:text="Next"/>

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

• • 菜单文件：**

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:id="@+id/action_next"
        android:title="@string/next"
        app:showAsAction="always"
        app:actionLayout="@layout/custom_button"/>
</menu>

• • 查看型号：**

package com.cupcake.jobsfinder.ui.create_job

import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.viewModelScope
import com.cupcake.jobsfinder.R
import com.cupcake.jobsfinder.domain.usecase.CreateJobUseCase
import com.cupcake.jobsfinder.ui.base.BaseViewModel
import com.cupcake.jobsfinder.ui.create_job.state.CreateJobUiState
import dagger.hilt.android.lifecycle.HiltViewModel
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.flow.update
import kotlinx.coroutines.launch
import javax.inject.Inject

@HiltViewModel
class CreateJobViewModel @Inject constructor(
    private val createJob: CreateJobUseCase
) : BaseViewModel() {

    private val _jobUiState = MutableStateFlow(CreateJobUiState())
    val jobUiState = _jobUiState.asStateFlow()

    private val _event = MutableLiveData<CreateJobEvent>()
    val event: LiveData<CreateJobEvent> = _event

    fun handleEvent(event: CreateJobEvent) {
        when (event) {
            is CreateJobEvent.PageScrolled -> {
                onChangeIndexViewPager(event.index)
            }

        }
    }

    private fun onChangeIndexViewPager(index: Int) {
        _jobUiState.update {
            it.copy(
                titleToolBar = getTitleToolBar(index)
            )
        }
    }

  

    private fun getTitleToolBar(index: Int): Int {
        return if (index == 0) R.string.next else R.string.post
    }

}

createJobFragment：
我发现一个没有文本的空白按钮只是一个空按钮
This how should look like
This how looks like actually