【发布时间】：2020-09-27 12:40:24
【问题描述】：
我已经为这个错误苦苦挣扎了几个小时，并尝试了我找到的大多数解决方案，但没有运气
我确定
- 布局是最外层的标签
- 启用数据绑定
- xml 中的拼写错误
- 在片段类中设置视图模型
- 当然还有使缓存无效并重新启动
import com.linguistic.linguistic.databinding.FragmentAddNewConversationBindingImpl; ^ symbol: class FragmentAddNewConversationBindingImpl
仅当我在 xml 调用中使用 viewmodel 时才会出现此错误
我的xml：
你会发现我在第一个单选按钮中使用 viewModel
<?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.linguistic.linguistic.learnerscreens.ui.addconversation.AddNewConversationViewModel" />
</data>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".learnerscreens.ui.addconversation.AddNewConversationFragment">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_margin="10dp"
android:background="@drawable/register_field_background"
android:orientation="vertical"
android:padding="15dp">
<ImageView
android:id="@+id/img_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_baseline_close_24"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:tint="@android:color/darker_gray"
tools:ignore="ContentDescription" />
<TextView
android:id="@+id/textView"
style="@style/bottomSheetDialogHeader"
android:layout_marginStart="16dp"
android:text="@string/add_conversation_dialog_title"
app:layout_constraintBottom_toBottomOf="@+id/img_close"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/img_close" />
<com.linguistic.linguistic.utils.ui.LinguisticRadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginBottom="20dp"
android:orientation="vertical"
app:layout_constraintBottom_toTopOf="@+id/tv_select_address"
app:layout_constraintTop_toBottomOf="@+id/textView">
<com.linguistic.linguistic.utils.ui.RadioLinguisticButton
android:id="@+id/add_new_native"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@{viewModel.languageName}"
app:icon="@drawable/ic_gray_user"
app:iconColor="@color/buttom_toggle_icon_selector"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:secondaryText="@string/currently_available"
app:textMainAppearance="@style/ToggleButtonText.ToggleButtonMainText"
app:textSecondaryAppearance="@style/ToggleButtonText.ToggleButtonSecondaryText" />
</com.linguistic.linguistic.utils.ui.LinguisticRadioGroup>
<Button
android:id="@+id/tv_select_address"
style="@style/bottomDialogSheetMainButton"
android:background="@drawable/top_bottom_gradient"
android:letterSpacing="-0.03"
android:text="@string/start_chatting"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</RelativeLayout>
</layout>
我的 ViewModel 类
package com.linguistic.linguistic.learnerscreens.ui.addconversation
import androidx.lifecycle.*
import com.linguistic.linguistic.LinguisticApplication
import com.linguistic.linguistic.data.models.AvailablePartners
import com.linguistic.linguistic.repository.LearnerRepository
import com.linguistic.linguistic.utils.getLanguageName
import kotlinx.coroutines.launch
class AddNewConversationViewModel : ViewModel() {
val languageName = MutableLiveData(getLanguageName(LinguisticApplication.getNativeLanguageID()!!))
val availablePartnersLiveData = liveData<AvailablePartners> {
LearnerRepository.getAvailablePartnerCounts(
LinguisticApplication.getNativeLanguageID()!!,
LinguisticApplication.getLearningLanguageID()!!)
}
}
我的 FragmentClass
package com.linguistic.linguistic.learnerscreens.ui.addconversation
import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.lifecycle.Observer
import androidx.lifecycle.ViewModelProvider
import com.google.android.material.bottomsheet.BottomSheetDialogFragment
import com.linguistic.linguistic.databinding.FragmentAddNewConversationBinding
import kotlinx.android.synthetic.main.linguistic_toggle_button.view.*
class AddNewConversationFragment : BottomSheetDialogFragment() {
private lateinit var binding: FragmentAddNewConversationBinding
private lateinit var viewModel: AddNewConversationViewModel
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
binding = FragmentAddNewConversationBinding.inflate(inflater, container, false)
return binding.root
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
viewModel = ViewModelProvider(this).get(AddNewConversationViewModel::class.java)
binding.viewModel = viewModel
binding.lifecycleOwner = viewLifecycleOwner
setHasOptionsMenu(true)
}
}
分级
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
apply plugin: 'com.apollographql.apollo'
apply plugin: "androidx.navigation.safeargs.kotlin"
apollo {
generateKotlinModels.set(true)
}
android {
compileSdkVersion 29
buildToolsVersion "29.0.3"
buildFeatures{
dataBinding = true
viewBinding = true
}
kotlinOptions {
jvmTarget = "1.8"
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
defaultConfig {
applicationId "com.linguistic.linguistic"
minSdkVersion 26
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$version_kotlin"
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.core:core-ktx:1.3.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
implementation 'androidx.legacy:legacy-support-v4:1.0.0'
implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
implementation 'androidx.navigation:navigation-fragment:2.3.0'
implementation 'androidx.navigation:navigation-ui:2.3.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
implementation 'com.google.android.material:material:1.3.0-alpha02'
implementation 'androidx.fragment:fragment-ktx:1.2.5'
compileOnly "org.jetbrains:annotations:13.0"
implementation 'androidx.preference:preference:1.1.1'
testCompileOnly "org.jetbrains:annotations:13.0"
implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.6"
implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.2.0'
}
【问题讨论】：
标签： android kotlin data-binding