如何解决Android:找不到符号类DataBinderMapperImpl找不到适用于Android的吸气剂:state_checked
我正在尝试将双向数据绑定与dagger hilt和viewmodel结合使用。但是,我的问题是我的构建失败,并显示错误...
错误代码
Task :app:kaptDebugKotlin
C:\Users\Censored\AndroidStudioProjects\Example\app\build\generated\source\kapt\debug\com\example\app\DataBinderMapperImpl.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
Android似乎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,在这里初始化了dataBinding
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
}
CalibrateRepairMessageFragment,问题出在这里!
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>()
}
我希望代码不要过多或混乱。我试图删除对我的问题不重要的所有内容(例如布局内容或不必要的功能)。在我的build.gradle中启用了数据绑定。
我知道,已经问过这个问题,但是没有人使用匕首-希尔特,我想这是我的问题吗?我感谢所有帮助,谢谢!
编辑
我更改了BaseFragment类和CalibrateMessageFragment类以附加我的视图模型。不幸的是,这并没有解决我的问题...
-
新BaseFragment
abstract class BaseFragment<T: ViewDataBinding>(val layout: Int) : Fragment() { abstract val viewModel: ViewModel // new // New override fun onCreateView(inflater: LayoutInflater,savedInstanceState: Bundle?): View? { return DataBindingUtil.inflate<T>(inflater,false).apply { lifecycleOwner = viewLifecycleOwner setVariable(BR.viewModel,viewModel) }.root } }
-
CalibrateMessageFragment
class CalibrateRepairMessageFragment(//...): EmailFragment<CalibrateRepairMessageBinding>( R.layout.fragment_calibrate_repair_message,//.. ) { // New override val viewModel: EmailViewModel by viewModels() }
编辑2
好吧,我又走了一步,发现com.google.android.material.card.MaterialCardView
不能为android:state_checked
提供吸气剂吗?我的错误至少显示以下内容:
[databinding] {"msg":"Cannot find a getter for \u003ccom.google.android.material.card.MaterialCardView android:state_checked\u003e that accepts parameter type \u0027java.lang.Boolean\u0027\n\n
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here您可以看到CardView为isChecked提供了一个吸气剂。
解决方法
好的,我已经通过编写自己的BindingAdapter.kt解决了问题,这是代码:
@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()
}
唯一的问题是我不知道要实现一种逻辑,以便我的MaterialCardView像Radio组一样工作。伤心。
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