安卓系统:找不到符号类DataBinderMapperImpl.找不到android的getter:state_chec

Question

我正在尝试将双向数据绑定与dagger-hilt和viewmodel结合使用。然而，我的问题是我的构建失败了，出现了错误。。。

错误代码

Task :app:kaptDebugKotlin
C:UsersCensoredAndroidStudioProjectsExampleappbuildgeneratedsourcekaptdebugcomexampleappDataBinderMapperImpl.java:9: error: cannot find symbol
import com.example.app.databinding.CalibrateRepairMessageContentBindingImpl;
^
symbol:   class CalibrateRepairMessageContentBindingImpl
Task :app:kaptDebugKotlin FAILED
location: package com.example.app.databinding

看起来Android无法创建我的数据绑定xml的impl文件。

这是我的代码：

XML文件，包含在我的fragment_calibrate_repair_message中

<?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.example.app.data.viewmodel.EmailViewModel" />
</data>
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.textfield.TextInputLayout
android:id="@+id/calibrate_repair_message_input">
<com.google.android.material.textfield.TextInputEditText
<!-- DATA BINDING -->
android:text="@={viewModel.etMessage}"/>
</com.google.android.material.textfield.TextInputLayout>
<com.google.android.material.card.MaterialCardView
android:id="@+id/calibrate_repair_ex_option_ONE"
android:checkable="true"
android:clickable="true"
android:focusable="true"
<!-- DATA BINDING -->
android:state_checked="@={viewModel.cardOptionOneChecked}">
</com.google.android.material.card.MaterialCardView>
<com.google.android.material.card.MaterialCardView
android:id="@+id/calibrate_repair_ex_option_TWO"
android:checkable="true"
android:clickable="true"
android:focusable="true"
<!-- DATA BINDING -->
android:state_checked="@={viewModel.cardOptionTwoChecked}">
</com.google.android.material.card.MaterialCardView>
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>

BaseFragment，dataBinding在此处初始化

abstract class BaseFragment<B: ViewDataBinding>(val layout: Int) : Fragment() {
//... Some variables that have nothing to do with dataBinding
// Here I am using Databinding! Using BaseFragment because all my fragments use dataBinding
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val binding = DataBindingUtil.inflate<B>(inflater, layout, container, false)
return binding.root
}
}

电子邮件片段

abstract class EmailFragment<B: ViewDataBinding>(
layout: Int,
//... etc
) : BaseFragment<B>(layout) {
//... Some variables that have nothing to do with dataBinding
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
//... Some functions that have nothing to do with dataBinding
}

CalibrateReairMessageFragment，此处出现问题

class CalibrateRepairMessageFragment(//...): 
// Here I am providing the actual DataBiding class "CalibrateRepairMessageContentBinding"
EmailFragment<CalibrateRepairMessageContentBinding>(
R.layout.fragment_calibrate_repair_message,
//..
) {

ViewModel

class EmailViewModel @ViewModelInject constructor(
@Assisted private val savedStateHandle: SavedStateHandle
) : ViewModel() {
// My three properties which are declared in my layout.xml
val etMessage = MutableLiveData<String>()
val cardOptionOneChecked = MutableLiveData<Boolean>()

val cardOptionTwoChecked = MutableLiveData<Boolean>()
}

我希望代码不要太多或太乱。我试着删除所有对我的问题不重要的东西(比如布局的东西或不必要的函数(。数据绑定在我的build.gradle.中启用

我知道这个问题已经被问过了，但他们中没有人使用dagger柄，我想这就是我的问题所在？我感谢每一次帮助，谢谢！

编辑

我已经更改了BaseFragment类和CalibrateMessageFragment类来附加我的视图模型。不幸的是，这并没有解决我的问题。。。

• 新的基本片段

  abstract class BaseFragment<T: ViewDataBinding>(val layout: Int) : Fragment() {
  abstract val viewModel: ViewModel // new
  // New
  override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
  return DataBindingUtil.inflate<T>(inflater, layout, container, false).apply {
  lifecycleOwner = viewLifecycleOwner
  setVariable(BR.viewModel, viewModel)
  }.root
  }
  }
  

• 校准消息片段

  class CalibrateRepairMessageFragment(//...): 
  EmailFragment<CalibrateRepairMessageBinding>(
  R.layout.fragment_calibrate_repair_message,
  //..
  ) {
  // New
  override val viewModel: EmailViewModel by viewModels()
  }
  

编辑2

好吧，我更进一步，发现com.google.android.material.card.MaterialCardView没有为android:state_checked提供getter？我的错误至少说明了以下几点：

[databinding] {"msg":"Cannot find a getter for u003ccom.google.android.material.card.MaterialCardView android:state_checkedu003e that accepts parameter type u0027java.lang.Booleanu0027nn
If a binding adapter provides the getter, check that the adapter is annotated correctly and that the parameter type matches.","file":"app\src\main\res\layout\calibrate_message_content.xml","pos":[{"line0":63,"col0":8,"line1":135,"col1":59}]}

但这没有任何意义，因为在这里您可以看到CardView为isChecked提供了一个getter。。

Answer 1

好的，我已经通过编写自己的BindingAdapter.kt解决了这个问题，下面是代码：

@BindingAdapter("state_checked")
fun setStateChecked(view: MaterialCardView, liveData: MutableLiveData<Boolean>) {
if (view.isChecked != liveData.value) {
liveData.value = view.isChecked
}
}
@InverseBindingAdapter(attribute = "state_checked")
fun getStateChecked(view: MaterialCardView,): Boolean {
return view.isChecked
}
@BindingAdapter("state_checkedAttrChanged")
fun setCheckedAttrListener(
view: MaterialCardView,
attrChange: InverseBindingListener,
) {
view.setOnClicklistener {
// logic is here
}
attrChange.onChange()
}

唯一的问题是，我无法实现一个逻辑，使我的MaterialCardView像一个Radio小组一样工作。悲哀的