Android CI build: Could not find aapt2-proto.jar

Try moving the google() method to the top of its execution block.

Maybe it's the order of repositories it searches in that causes the issue.

So for example, change this:

repositories {  maven { url 'https://maven.fabric.io/public' }  google() // from here  mavenCentral()}

To this:

repositories {  google() // to here  maven { url 'https://maven.fabric.io/public' }  mavenCentral()}

If that doesn't help, instead of calling the google() method, try changing it to this:

maven {  url 'https://maven.google.com/'  name 'Google'}

UPDATE

If all of the above didn't help - make sure your gradle version is at least 3.0.0:

dependencies {  classpath 'com.android.tools.build:gradle:3.2.1'}

And the gradle-wrapper version is at least 4.1:

Usually located here: project_name/gradle/wrapper/gradle-wrapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.2-all.zip

Source

Upgrading the Gradle wrapper (in gradle-wrapper.properties) to gradle-4.10.2-all.zip fixed the problem to me.

Update Gradle Version

From the android gradle release page you can check compatible version for your gradle plugin.

Update gradle version in gradle-wrapper.properties located inside yourProject/gradle/wrapper

distributionUrl=https\://services.gradle.org/distributions/gradle-4.4.0-all.zip

Plugin version  Required Gradle version   2.3.0+             3.3+   3.0.0+             4.1+   3.1.0+             4.4+

Note that order matters. google() should be top of any plugin repo.

For Android Studio version > 3.0

buildscript {  repositories {      google() // move it to top      jcenter()  }  dependencies {      classpath 'com.android.tools.build:gradle:3.2.1' // your Android Studio Version  }} allprojects {  repositories {      google() // move it to top      jcenter()}

google() plugin is needed since Android Studio version 3.0 or higher.

For Android Studio version < 3.0

buildscript {  repositories {      maven {       url 'https://maven.google.com/'       name 'Google'      }      jcenter()  }  dependencies {      classpath 'com.android.tools.build:gradle:2.3.0' // your Android Studio Version  }} allprojects {  repositories {      maven {       url 'https://maven.google.com/'       name 'Google'      }      jcenter()}