Develop Reference

Using Kotlin in a library module without using it in the app module

I'm trying to use Kotlin in a library module without using it in the app module. The app module only uses Java and does not use any Kotlin classes from the library. Gradle won't compile hoever:
Error:(2, 1) A problem occurred evaluating project ':<Library>'.
> Plugin with id 'kotlin-android' not found.
Changes I made to include Kotlin:
{library root} / build.gradle
buildscript {
ext.kotlin_version = '1.1.3-2'
repositories {
jcenter()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
...
}
allprojects {
repositories {
jcenter()
}
}
{library root} / {library module} / build.gradle
apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
...
dependencies{
...
compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
}
When I add the same to the app module, the project compiles without issue, but I'd like to avoid adding it in the app module because I'd like to use this library in multiple apps without making code changes to those apps
Gradle version used : 3.3
android gradle plugin version: 2.3.3
Edit: #Jushua's answer works, but it still requires to update the project root build.gradle. I was hoping for a solution where only the dependency on the library would have to be added to make the whole thing work.

I am able to do that without any problem.
build.gradle (Project)
buildscript {
ext.kotlin_version = "1.1.4"
repositories {
jcenter()
}
dependencies {
classpath "com.android.tools.build:gradle:2.3.3"
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
jcenter()
maven {
url "https://maven.google.com"
}
}
}
build.gradle (app)
apply plugin: "com.android.application"
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
applicationId "com.example.app"
minSdkVersion 21
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
}
}
}
dependencies {
compile fileTree(dir: "libs", include: ["*.jar"])
androidTestCompile("com.android.support.test.espresso:espresso-core:2.2.2", {
exclude group: "com.android.support", module: "support-annotations"
})
compile "com.android.support:appcompat-v7:26.0.1"
testCompile "junit:junit:4.12"
compile project(path: ":library")
}
build.gradle (library)
apply plugin: "com.android.library"
apply plugin: "kotlin-android"
apply plugin: "kotlin-android-extensions"
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
minSdkVersion 17
targetSdkVersion 26
versionCode 13
versionName "1.1.4"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
}
}
}
dependencies {
compile fileTree(dir: "libs", include: ["*.jar"])
androidTestCompile("com.android.support.test.espresso:espresso-core:2.2.2", {
exclude group: "com.android.support", module: "support-annotations"
})
compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
compile "com.android.support:appcompat-v7:26.0.1"
testCompile "junit:junit:4.12"
}

You just need to add in your module build:
buildscript {
// (Optional) ext.kotlin_version = '1.1.4-3'
repositories {
google()
jcenter()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'com.android.library'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
and you could either declare the kotlin_version variable in that specific build, or declaring it in the project root build file, since the kotlin version could be updated from other modules:
buildscript {
ext.kotlin_version = '1.1.4-3'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.0-beta3'
}
}
allprojects {
repositories {
google()
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

You can add buildscript section with kotlin plugins only in your library:
buildscript {
ext.kotlin_version = '1.1.4-2'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: "kotlin-android"
apply plugin: "kotlin-android-extensions"
And now you can include library to application, without modification of root build.gradle
compile project(path: ":library")

Adding apply plugin: 'org.robolectric' in (app)gradle file shows project refresh failed Error:The Android Gradle plugin 2.1.2 is not supported

Hi Am trying to configure Jenkins in android studio. I followed this link
and i installed Jenkins in MAC system and verified with my localhost to check its running perfectly or not(as mentioned in the above link).
I have added following line in my project(root) dependency.
classpath 'org.robolectric:robolectric-gradle-plugin:1.0.1'
My updated project .gradle file is
dependencies {
classpath 'com.android.tools.build:gradle:2.1.2'
classpath 'org.robolectric:robolectric-gradle-plugin:1.0.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
No issues while sync project .gradle file.
But the problem starts after updating(adding robolectric) app .gradle file
apply plugin: 'com.android.application'
apply plugin: 'org.robolectric'
this gives me the following error message
Gradle 'CreatrixAndApp' project refresh failed
Error:The Android Gradle plugin 2.1.2 is not supported.
this is my project root .gradle file
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.2'
classpath 'org.robolectric:robolectric-gradle-plugin:1.0.1'
}
}
allprojects {
repositories {
jcenter()
}
}
this is my app .gradle file
apply plugin: 'com.android.application'
apply plugin: 'org.robolectric'
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.2'
}
}
repositories {
mavenCentral()
maven {
url "${System.env.HOME}/.m2/repository"
}
flatDir {
dirs 'libs'
}
}
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
useLibrary 'org.apache.http.legacy'
defaultConfig {
applicationId 'com.creatrixhrm'
minSdkVersion 16
targetSdkVersion 23
versionCode 20160615
versionName "1.6.0"
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
productFlavors {
}
dexOptions {
javaMaxHeapSize "4g"
preDexLibraries = false
}
lintOptions {
checkReleaseBuilds false
abortOnError false
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile project(':photoViewerLibrary')
compile project(':multipleImagePick')
compile(name: 'creatrixone1_1', ext: 'aar')
compile 'com.android.support:multidex:1.0.1'
compile 'com.android.support:cardview-v7:23.3.0'
compile 'com.android.support:recyclerview-v7:23.3.0'
compile 'com.android.support:design:23.3.0'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:support-vector-drawable:23.3.0'
compile 'com.android.support:animated-vector-drawable:23.3.0'
compile 'com.koushikdutta.ion:ion:2.1.7'
compile 'mbanje.kurt:fabbutton:1.2.2#aar'
compile 'com.google.code.gson:gson:2.4'
compile 'com.android.support:support-v4:23.3.0'
compile 'com.google.android.gms:play-services-gcm:8.4.0'
compile 'io.jsonwebtoken:jjwt:0.6.0'
}
I tried following this suggestion, but no use
can anyone tell me where i am making mistake

gradle is not resolving any new dependencies in android studio

I am making an Intro for my app.So after some research i had got an github project which is used to make cool intros.It requires following dependencies :
compile 'com.github.paolorotolo:appintro:4.0.0'
when I compile it with gradle it gives me following errors:
Failed to resolve: com.github.paolorotolo:appintro:4.0.0
I have done some research on internet but anything didn't worked out.
here is my build.gradle(Module:app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "24.0.1"
defaultConfig {
applicationId "com.example.adarsh.testapp"
minSdkVersion 16
targetSdkVersion 24
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:support-v4:24.2.0'
compile 'com.github.paolorotolo:appintro:4.0.0'
}
and here is my build.gradle(project:testapp)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

I solved my issue by just adding mavenCentral() in repositories in build.gradle.

firebase setup on android

I can't setup the updated version of firebase on android studio.
I've created json file of the project on the site firebase and copied it into the project and after coping lines in gradle:
buildscript {
// ...
dependencies {
// ...
classpath 'com.google.gms:google-services:3.0.0'
}
}
apply plugin: 'com.android.application'
android {
// ...
}
dependencies {
compile 'com.google.firebase:firebase-core:9.0.1'
}
// ADD THIS AT THE BOTTOM
apply plugin: 'com.google.gms.google-services'
I get the following error:
failed to resolve: compile 'com.google.firebase:firebase-core:9.0.0'
How can I fix it?

I had the same problem. If you are using Android studio, you should then update google repository in SDK Manager.
Following is my build.grade(app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
useLibrary 'org.apache.http.legacy'
defaultConfig {
applicationId "package name"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
vectorDrawables.useSupportLibrary = true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile 'com.google.firebase:firebase-core:9.0.0'
}
apply plugin: 'com.google.gms.google-services'
And this is my build.grade(project)
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.0'
classpath 'com.google.gms:google-services:3.0.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}

Firebase is working based on Google Play Services. So please make sure you have the following sdk tools and they are updated to sync against the library versions of firebase that you are using.
SDK Tools installed for this project
Project level build.gradle file
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.2'
classpath 'com.google.gms:google-services:3.0.0'
}
}
allprojects {
repositories {
jcenter()
}
}
Module Level build.gradle file
apply plugin: 'com.android.application'
android {
packagingOptions {
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE-FIREBASE.txt'
exclude 'META-INF/NOTICE'
}
compileSdkVersion 23
buildToolsVersion "23.0.1"
defaultConfig {
applicationId "com.devdeeds.firebaseauth"
minSdkVersion 17
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.google.firebase:firebase-auth:9.2.0'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:design:23.3.0'
}
apply plugin: 'com.google.gms.google-services'

AndroidStudio/Kotlin - Unresolved reference: ReadWriteProperty - Kotlin version 1.0.0-beta-1038

I have a working Android project using Kotlin version 1.0.0-beta-1038 in Android Studio.
I can run it using Kotlin in different parts, it compiles and works in the emulator but when I tried to use ReadWriteProperty it gives this error message:
Unresolved reference: ReadWriteProperty
Class called PreferenceUtils.kt:
build.grade (Module: app)
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
android {
compileSdkVersion 23
buildToolsVersion "23.0.1"
defaultConfig {
applicationId "com.droidcba.oculto"
minSdkVersion 16
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
sourceSets {
main.java.srcDirs += 'src/main/kotlin'
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.0.1'
compile 'com.android.support:design:23.0.1'
compile 'com.android.support:recyclerview-v7:23.0.1'
compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
compile 'com.squareup.retrofit:retrofit:2.0.0-beta1'
compile 'com.squareup.retrofit:adapter-rxjava:2.0.0-beta1'
compile 'com.squareup.retrofit:converter-gson:2.0.0-beta1'
compile 'io.reactivex:rxandroid:1.0.1'
compile 'io.reactivex:rxjava:1.0.14'
}
buildscript {
ext.kotlin_version = '1.0.0-beta-1038'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
}
}
repositories {
mavenCentral()
}
build.grade (Module: myProject)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.3.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
Please let me know if you need more info. Thanks!

Solved! I have to upgrade the Kotlin Plugin
from Android Studio. It started to recognise "ReadWriteProperty".