我尝试构建应用程序，但不断收到 /Users/gouravkarwasara/Desktop/News2/app/build/ generated/source/kapt/debug/com/gourav/news/DataBinderMapperImpl.java:9: 错误：找不到符号 导入 com.gourav.news.databinding.ActivityDetailBindingImpl; ^ 符号：类 ActivityDetailBindingImpl 位置：包 com.gourav.news.databinding
这个错误。
我尝试过清理并构建也无效并重新启动
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
compileSdkVersion 28
defaultConfig {
applicationId "com.gourav.news"
minSdkVersion 21
targetSdkVersion 28
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
dataBinding {
enabled = true
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0-alpha02'
implementation 'androidx.core:core-ktx:1.1.0-alpha04'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test:runner:1.1.2-alpha01'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.2-alpha01'
implementation "androidx.lifecycle:lifecycle-extensions:2.0.0"
kapt "androidx.lifecycle:lifecycle-compiler:2.0.0"
implementation "androidx.room:room-runtime:2.0.0"
kapt "androidx.room:room-compiler:2.0.0"
implementation 'com.google.android.material:material:1.1.0-alpha03'
implementation "com.squareup.retrofit2:retrofit:2.4.0"
implementation "com.squareup.retrofit2:converter-gson:2.4.0"
implementation "com.squareup.okhttp3:logging-interceptor:3.11.0"
// Retrofit for networking
implementation "com.squareup.retrofit2:retrofit:2.4.0"
implementation "com.squareup.retrofit2:converter-gson:2.4.0"
implementation "com.squareup.okhttp3:logging-interceptor:3.11.0"
//Timber for logging
implementation "com.jakewharton.timber:timber:4.7.1"
// Image Loading and Caching
implementation "com.github.bumptech.glide:glide:4.8.0"
annotationProcessor "com.github.bumptech.glide:compiler:4.8.0"
implementation "com.google.firebase:firebase-core:16.0.7"
}
活动详细信息.xml
<?xml version="1.0" encoding="utf-8"?>
<layout>
<data>
<import type="com.gourav.news.utils.BindingUtils" />
<variable
name="article"
type="com.gourav.news.model.Article" />
</data>
<ScrollView 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"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:bind="http://schemas.android.com/apk/res-auto">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="16dp"
tools:context=".DetailActivity">
<View
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="@id/tv_news_source"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/iv_news_image" />
<ImageView
android:id="@+id/iv_news_image"
android:layout_width="match_parent"
android:layout_height="0dp"
android:contentDescription="@string/image_desc"
android:foreground="@drawable/news_image_gradient"
app:layout_constraintDimensionRatio="h,16:9"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
bind:articleUrl="@{article.url}"
bind:urlToImage="@{article.urlToImage}" />
<ImageButton
android:id="@+id/iv_save"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_marginEnd="4dp"
android:background="?selectableItemBackgroundBorderless"
android:contentDescription="@string/image_desc_save_button"
app:layout_constraintEnd_toStartOf="@id/iv_share"
app:layout_constraintTop_toTopOf="@id/tv_time"
app:srcCompat="@drawable/ic_save" />
<ImageButton
android:id="@+id/iv_share"
android:layout_width="48dp"
android:layout_height="48dp"
android:background="?selectableItemBackgroundBorderless"
android:contentDescription="@string/image_desc_share_button"
app:layout_constraintEnd_toStartOf="@id/guideline_right"
app:layout_constraintTop_toTopOf="@id/tv_time"
app:srcCompat="@drawable/ic_share" />
<TextView
android:id="@+id/tv_time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:text="@{BindingUtils.formatDateForDetails(article.publishedAt)}"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="@id/guideline_left"
app:layout_constraintTop_toBottomOf="@+id/tv_news_title"
tools:text="@tools:sample/date/ddmmyy" />
<TextView
android:id="@+id/tv_news_source"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="4dp"
android:paddingBottom="18dp"
android:text="@{article.source.name}"
android:textSize="16sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="@id/guideline_left"
app:layout_constraintTop_toBottomOf="@id/tv_time"
tools:text="The Washington Post" />
<TextView
android:id="@+id/tv_news_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="16dp"
android:lineSpacingMultiplier="1.1"
android:text="@{article.title}"
android:textColor="@color/colorAccent"
android:textSize="24sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="@id/guideline_right"
app:layout_constraintStart_toStartOf="@id/guideline_left"
app:layout_constraintTop_toBottomOf="@id/iv_news_image"/>
<TextView
android:id="@+id/tv_news_desc"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:alpha="0.6"
android:lineSpacingMultiplier="1.3"
android:text="@{article.description}"
android:textColor="@color/colorAccent"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="@id/guideline_right"
app:layout_constraintStart_toStartOf="@id/guideline_left"
app:layout_constraintTop_toBottomOf="@id/tv_news_source"
tools:layout_editor_absoluteY="365dp"/>
<TextView
android:id="@+id/tv_news_content"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:alpha="0.6"
android:lineSpacingMultiplier="1.3"
android:text="@{BindingUtils.truncateExtra(article.content)}"
android:textColor="@color/colorAccent"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="@id/guideline_right"
app:layout_constraintStart_toStartOf="@id/guideline_left"
app:layout_constraintTop_toBottomOf="@id/tv_news_desc"/>
<Button
android:id="@+id/btn_read_full"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:background="@drawable/button_selector"
android:paddingStart="16dp"
android:paddingEnd="16dp"
android:text="@string/button_read_full_story"
android:textSize="16sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tv_news_content" />
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:background="?actionBarItemBackground"
android:fitsSystemWindows="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navigationIcon="@drawable/ic_close" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="12dp" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/guideline_right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_end="12dp" />
<androidx.constraintlayout.widget.Barrier
android:id="@+id/bottom_barrier"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:barrierDirection="bottom"
app:constraint_referenced_ids="tv_news_desc,tv_news_content,tv_news_title" />
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</layout>
详细活动.kt
class DetailActivity : AppCompatActivity() {
private lateinit var binding: ActivityDetailBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_detail)
}
}
请执行下列操作。
在此示例中，问题是，我对可见性参数使用布尔值，如下所示：android:visibility="@{true}"当它应该是一个整数时，但您的数据绑定错误很可能是其他东西。