[Gradle] Fix Gradle warnings

Resolves #2899

GIT_ORIGIN_REV_ID=02220413a6cd9056718d659a18dd7251e6c4c55d
PiperOrigin-RevId: 486658302

.travis.yml

@@ -42,5 +42,5 @@ before_script:
   - adb shell input keyevent 82
 
 script:
-  - ./gradlew test -PdisablePreDex
-  - ./gradlew connectedAndroidTest -PdisablePreDex
+  - ./gradlew test
+  - ./gradlew connectedAndroidTest

build.gradle

@@ -51,9 +51,6 @@ ext {
   // required for the doclava dependency.
   usePrebuilts = "true"
 
-  // Disable pre-dexing when gradle called with -PdisablePreDex;
-  preDexLibs = !project.hasProperty('disablePreDex')
-
   mavenRepoUrl = (project.hasProperty('mavenRepoUrl')
     ? project.property('mavenRepoUrl') : '/tmp/myRepo/')
 
@@ -189,9 +186,6 @@ subprojects {
     }
 
     if (isAndroidLibrary || isAndroidApp || isAndroidTest) {
-      // Disable pre-dexing when gradle called with -PdisablePreDex;
-      project.android.dexOptions.preDexLibraries = rootProject.ext.preDexLibs
-
       project.android {
         compileSdkVersion rootProject.ext.compileSdkVersion
 
@@ -207,8 +201,8 @@ subprojects {
         aaptOptions.additionalParameters "--no-version-vectors"
 
         android {
-          lintOptions {
-            check 'NewApi'
+          lint {
+            checkOnly 'NewApi'
           }
         }
 

lib/build.gradle

@@ -241,7 +241,7 @@ afterEvaluate {
 }
 
 task androidSourcesJar(type: Jar) {
-  classifier = 'sources'
+  archiveClassifier.set('sources')
   from(android.sourceSets.main.java.srcDirs) {
     // Needed because we have Java sources and resources in same directory
     include '**/*.java'