如何解决当我在Android Studio中使用数据绑定时,无法智能地将错误强制转换为“ HomeViewModel”吗?
我使用HomeViewModel
将<variable name="aHomeViewModel"type="info.dodata.voicerecorder.viewcontrol.HomeViewModel" />
绑定到layout.xml
运行代码时出现以下错误。
不可能将类型强制转换为“ HomeViewModel”,因为“ binding.aHomeViewModel”是可变的属性,可能此时已经更改了
我认为binding.aHomeViewModel.delete(binding.amVoice)
导致了错误,该如何解决?
VoiceAdapters.kt
class VoiceAdapters (private val aHomeViewModel: HomeViewModel):
ListAdapter<MVoice,VoiceAdapters.VoiceViewHolder>(MVoiceDiffCallback()) {
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): VoiceViewHolder {
return VoiceViewHolder(
LayoutVoiceItemBinding.inflate(LayoutInflater.from(parent.context),parent,false)
)
}
override fun onBindViewHolder(holder: VoiceViewHolder,position: Int) {
val aMVoice = getItem(position)
holder.bind(aHomeViewModel,aMVoice)
}
class VoiceViewHolder (private val binding: LayoutVoiceItemBinding):
RecyclerView.ViewHolder(binding.root) {
init {
setControl()
}
private fun navigateToDetail( view: View,aMVoice: MVoice )
{
val direction = FragmentHomeDirections.actionHome2Detail(aMVoice)
view.findNavController().navigate(direction)
}
fun bind(aHomeViewModel: HomeViewModel,aMVoice: MVoice){
binding.amVoice=aMVoice
binding.aHomeViewModel=aHomeViewModel
binding.executePendingBindings()
}
fun setControl(){
binding.btnDelete.setOnClickListener {
binding.amVoice?.let {
binding.aHomeViewModel?.let {
binding.aHomeViewModel.delete(binding.amVoice) //I think it cause error.
}
}
}
}
}
}
class MVoiceDiffCallback : DiffUtil.ItemCallback<MVoice>() {
...
}
HomeViewModel.kt
class HomeViewModel(private val mDBVoiceRepository: DBVoiceRepository) : ViewModel() {
...
fun delete(aMVoice: MVoice){
viewModelScope.launch {
mDBVoiceRepository.deleteVoice(aMVoice)
}
}
}
layout.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">
<data>
<variable name="aMVoice"
type="info.dodata.voicerecorder.model.MVoice" />
<variable name="aHomeViewModel"
type="info.dodata.voicerecorder.viewcontrol.HomeViewModel" />
</data>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:orientation="horizontal">
<TextView
android:id="@+id/voiceID"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@{Integer.toString(aMVoice.id)}" />
<TextView
android:id="@+id/title_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="50dp"
android:text="@{aMVoice.name}" />
...
</LinearLayout>
</layout>
添加的内容
如果使用代码A,我将获得新的编译警告信息Warning A。
代码A
binding.btnDelete.setOnClickListener {
binding.aHomeViewModel!!.delete(binding.amVoice!!)
}
警告A
在此版本中使用了不推荐使用的Gradle功能,使其与Gradle 7.0不兼容。 使用“ --warning-mode all”来显示各个弃用警告。
解决方法
HomeViewModel
是一个可变的属性,这一次可能已更改。必须与!!
或?
接线员一起使用安全通话
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