Use java8 compatible to fix build issues

Also enable multidex

Author: brettchabot

ui/espresso/AccessibilitySample/app/build.gradle

@@ -11,6 +11,8 @@ android {
         versionName "1.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+
+        multiDexEnabled true
     }
     lintOptions {
         abortOnError false
@@ -22,6 +24,10 @@ android {
             includeAndroidResources = true
         }
     }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
 }
 
 tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
@@ -34,6 +40,7 @@ dependencies {
     // App dependencies
     implementation 'androidx.annotation:annotation:' + rootProject.androidxAnnotationVersion;
     implementation 'com.google.guava:guava:' + rootProject.guavaVersion
+    implementation 'androidx.multidex:multidex:2.0.1'
 
     // Testing-only dependencies
     androidTestImplementation 'androidx.test:core:' + rootProject.coreVersion

ui/espresso/AccessibilitySample/build.gradle

@@ -8,7 +8,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong

ui/espresso/AccessibilitySample/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Wed Jan 06 11:50:52 PST 2021
+#Wed Jan 06 14:30:55 PST 2021
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-bin.zip