android/android-interop-testing/examples: upgrade android plugin

This resolves #5523

While bumping `com.android.tools.build:gradle:3.1.2` to `3.3.0`, some other plugins/artifacts/maven repo/buildscripts have to be updated:

- gradle (wrapper) need to upgrade to 4.10.x
- protobuf gradle plugin need to bump a version compatible with gradle version.
- need add `google()` and `jcenter()` repos for android (otherwise `com.android.tools.build:aapt2:3.3.0x` and `trove4j` will not be found resp.)
- need to accept license for Android "build-tools;28.0.3" in kokoro env.

21 files changed, 31 insertions, 20 deletions

diff --git a/README.md b/README.md
index 5e79bf1a4..e12d7c24d 100644
--- a/README.md
+++ b/README.md
@@ -131,7 +131,7 @@ buildscript {
     mavenCentral()
   }
   dependencies {
-    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.5'
+    classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.8'
   }
 }
 
diff --git a/android-interop-testing/build.gradle b/android-interop-testing/build.gradle
index d4fce1431..2f363241d 100644
--- a/android-interop-testing/build.gradle
+++ b/android-interop-testing/build.gradle
@@ -6,8 +6,8 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.2'
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.5"
+        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.8"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/android/build.gradle b/android/build.gradle
index 6ee0bfc76..c1b54341e 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -12,7 +12,7 @@ buildscript {
         maven { url "https://plugins.gradle.org/m2/" }
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
+        classpath 'com.android.tools.build:gradle:3.3.0'
         classpath "net.ltgt.gradle:gradle-errorprone-plugin:0.6"
         classpath 'com.github.dcendents:android-maven-gradle-plugin:2.1'
     }
@@ -36,6 +36,8 @@ android {
 }
 
 repositories {
+    google()
+    jcenter()
     mavenCentral()
     mavenLocal()
 }
diff --git a/build.gradle b/build.gradle
index 22981ef55..a5cfa970f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -213,7 +213,7 @@ subprojects {
             protoc_lite: "com.google.protobuf:protoc-gen-javalite:3.0.0",
             protobuf_nano: "com.google.protobuf.nano:protobuf-javanano:${protobufNanoVersion}",
             protoc_nano: "com.google.protobuf:protoc:3.5.1-1",
-            protobuf_plugin: 'com.google.protobuf:protobuf-gradle-plugin:0.8.5',
+            protobuf_plugin: 'com.google.protobuf:protobuf-gradle-plugin:0.8.8',
             protobuf_util: "com.google.protobuf:protobuf-java-util:${protobufVersion}",
             lang: "org.apache.commons:commons-lang3:3.5",
 
diff --git a/buildscripts/kokoro/android-interop.sh b/buildscripts/kokoro/android-interop.sh
index 8c0fc55c5..2c5d6c84d 100755
--- a/buildscripts/kokoro/android-interop.sh
+++ b/buildscripts/kokoro/android-interop.sh
@@ -16,6 +16,8 @@ export CXXFLAGS=-I/tmp/protobuf/include
 export LD_LIBRARY_PATH=/tmp/protobuf/lib
 export OS_NAME=$(uname)
 
+echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;28.0.3"
+
 # Proto deps
 buildscripts/make_dependencies.sh
 
diff --git a/buildscripts/kokoro/android.sh b/buildscripts/kokoro/android.sh
index e261c5a2a..4d29627f1 100755
--- a/buildscripts/kokoro/android.sh
+++ b/buildscripts/kokoro/android.sh
@@ -16,6 +16,8 @@ export CXXFLAGS=-I/tmp/protobuf/include
 export LD_LIBRARY_PATH=/tmp/protobuf/lib
 export OS_NAME=$(uname)
 
+echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;28.0.3"
+
 # Proto deps
 buildscripts/make_dependencies.sh
 
diff --git a/buildscripts/kokoro/linux_artifacts.sh b/buildscripts/kokoro/linux_artifacts.sh
index a442acc14..1c0f52bf7 100755
--- a/buildscripts/kokoro/linux_artifacts.sh
+++ b/buildscripts/kokoro/linux_artifacts.sh
@@ -12,6 +12,7 @@ readonly GRPC_JAVA_DIR="$(cd "$(dirname "$0")"/../.. && pwd)"
 
 # grpc-android requires the Android SDK, so build outside of Docker and
 # use --include-build for its grpc-core dependency
+echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;28.0.3"
 LOCAL_MVN_TEMP=$(mktemp -d)
 pushd "$GRPC_JAVA_DIR/android"
 ../gradlew uploadArchives \
diff --git a/examples/android/clientcache/build.gradle b/examples/android/clientcache/build.gradle
index 2e20251bc..4e934ef68 100644
--- a/examples/android/clientcache/build.gradle
+++ b/examples/android/clientcache/build.gradle
@@ -6,8 +6,8 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.5"
+        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.8"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/examples/android/helloworld/build.gradle b/examples/android/helloworld/build.gradle
index 2e20251bc..4e934ef68 100644
--- a/examples/android/helloworld/build.gradle
+++ b/examples/android/helloworld/build.gradle
@@ -6,8 +6,8 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.5"
+        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.8"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/examples/android/routeguide/build.gradle b/examples/android/routeguide/build.gradle
index 5ead69a49..cf0116d9f 100644
--- a/examples/android/routeguide/build.gradle
+++ b/examples/android/routeguide/build.gradle
@@ -6,8 +6,8 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.5"
+        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.8"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
diff --git a/examples/build.gradle b/examples/build.gradle
index 1696dadc5..6b21d2359 100644
--- a/examples/build.gradle
+++ b/examples/build.gradle
@@ -2,7 +2,7 @@ plugins {
     // Provide convenience executables for trying out the examples.
     id 'application'
     // ASSUMES GRADLE 2.12 OR HIGHER. Use plugin version 0.7.5 with earlier gradle versions
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.8'
     // Generate IntelliJ IDEA's .idea & .iml project files
     id 'idea'
 }
diff --git a/examples/example-alts/build.gradle b/examples/example-alts/build.gradle
index 07fc5e822..1f1423f51 100644
--- a/examples/example-alts/build.gradle
+++ b/examples/example-alts/build.gradle
@@ -2,7 +2,7 @@ plugins {
     // Provide convenience executables for trying out the examples.
     id 'application'
     // ASSUMES GRADLE 2.12 OR HIGHER. Use plugin version 0.7.5 with earlier gradle versions
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.8'
     // Generate IntelliJ IDEA's .idea & .iml project files
     id 'idea'
 }
diff --git a/examples/example-gauth/build.gradle b/examples/example-gauth/build.gradle
index 58df8da34..85a049986 100644
--- a/examples/example-gauth/build.gradle
+++ b/examples/example-gauth/build.gradle
@@ -2,7 +2,7 @@ plugins {
     // Provide convenience executables for trying out the examples.
     id 'application'
     // ASSUMES GRADLE 2.12 OR HIGHER. Use plugin version 0.7.5 with earlier gradle versions
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.8'
     // Generate IntelliJ IDEA's .idea & .iml project files
     id 'idea'
 }
diff --git a/examples/example-kotlin/android/helloworld/build.gradle b/examples/example-kotlin/android/helloworld/build.gradle
index bc1865883..e2d060ddb 100644
--- a/examples/example-kotlin/android/helloworld/build.gradle
+++ b/examples/example-kotlin/android/helloworld/build.gradle
@@ -9,8 +9,8 @@ buildscript {
         mavenLocal()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.0.1'
-        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.5"
+        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath "com.google.protobuf:protobuf-gradle-plugin:0.8.8"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
diff --git a/examples/example-kotlin/build.gradle b/examples/example-kotlin/build.gradle
index 820891c10..ed70bd658 100644
--- a/examples/example-kotlin/build.gradle
+++ b/examples/example-kotlin/build.gradle
@@ -1,6 +1,6 @@
 plugins {
     id 'org.jetbrains.kotlin.jvm' version'1.3.10'
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.8'
 
     // Generate IntelliJ IDEA's .idea & .iml project files
     // Starting with 0.8.4 of protobuf-gradle-plugin, *.proto and the gen output files are added
@@ -14,6 +14,8 @@ plugins {
 }
 
 repositories {
+    google()
+    jcenter()
     mavenCentral()
     mavenLocal()
 }
diff --git a/examples/example-kotlin/settings.gradle b/examples/example-kotlin/settings.gradle
index b5f630207..4c82b6089 100644
--- a/examples/example-kotlin/settings.gradle
+++ b/examples/example-kotlin/settings.gradle
@@ -1,5 +1,7 @@
 pluginManagement {
     repositories {
+        google()
+        jcenter()
         maven { // The google mirror is less flaky than mavenCentral()
             url "https://maven-central.storage-download.googleapis.com/repos/central/data/"
         }
diff --git a/examples/example-tls/build.gradle b/examples/example-tls/build.gradle
index 574b3561f..7156e92f2 100644
--- a/examples/example-tls/build.gradle
+++ b/examples/example-tls/build.gradle
@@ -2,7 +2,7 @@ plugins {
     // Provide convenience executables for trying out the examples.
     id 'application'
     // ASSUMES GRADLE 2.12 OR HIGHER. Use plugin version 0.7.5 with earlier gradle versions
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.8'
     // Generate IntelliJ IDEA's .idea & .iml project files
     id 'idea'
 }
diff --git a/examples/gradle/wrapper/gradle-wrapper.jar b/examples/gradle/wrapper/gradle-wrapper.jar
index 0d4a95168..135367700 100644
--- a/examples/gradle/wrapper/gradle-wrapper.jar
+++ b/examples/gradle/wrapper/gradle-wrapper.jar
diff --git a/examples/gradle/wrapper/gradle-wrapper.properties b/examples/gradle/wrapper/gradle-wrapper.properties
index a95009c3b..5c1b6c95b 100644
--- a/examples/gradle/wrapper/gradle-wrapper.properties
+++ b/examples/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 0d4a95168..135367700 100644
--- a/gradle/wrapper/gradle-wrapper.jar
+++ b/gradle/wrapper/gradle-wrapper.jar
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a95009c3b..5c1b6c95b 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists