title: error: cannot find symbol import com.gourav.news.databinding.ActivityDetailBindingImpl;
body: <p>I tried Buiding the app but keep getting /Users/gouravkarwasara/Desktop/News2/app/build/generated/source/kapt/debug/com/gourav/news/DataBinderMapperImpl.java:9: error: cannot find symbol
  import com.gourav.news.databinding.ActivityDetailBindingImpl;
                                    ^
    symbol:   class ActivityDetailBindingImpl
    location: package com.gourav.news.databinding</p>
  
  <p>this error.</p>
  
  <p>I have tried clean and build also Invalidate and restart</p>
  
  <pre><code>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"
  }
  </code></pre>
  
  <p>activity_detail.xml</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layout&gt;
  
  &lt;data&gt;
  
      &lt;import type="com.gourav.news.utils.BindingUtils" /&gt;
  
      &lt;variable
              name="article"
              type="com.gourav.news.model.Article" /&gt;
  &lt;/data&gt;
  
  &lt;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"&gt;
  
      &lt;androidx.constraintlayout.widget.ConstraintLayout
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:paddingBottom="16dp"
              tools:context=".DetailActivity"&gt;
  
          &lt;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" /&gt;
  
          &lt;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}" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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"/&gt;
  
          &lt;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"/&gt;
  
          &lt;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"/&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
          &lt;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" /&gt;
  
      &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
  
  &lt;/ScrollView&gt;
  &lt;/layout&gt;
  </code></pre>
  
  <p>DetailActivity.kt</p>
  
  <pre><code>class DetailActivity : AppCompatActivity() {
      private lateinit var binding: ActivityDetailBinding
  
      override fun onCreate(savedInstanceState: Bundle?) {
          super.onCreate(savedInstanceState)
          binding = DataBindingUtil.setContentView(this, R.layout.activity_detail)
  
      }
  }
  </code></pre>