Develop Reference

How to find gradle plugin id for given gradle library?

I am currently updating my project and as one of the steps I am changing gradle files to use the plugins { id 'xxx' } way instead of the legacy apply plugin 'xxx' approach. I was able to migrate most of the imports to the new format, however I cannot add some plugins, as I am unable to find their gradle plugin ids.
For example, here are my old gradle files:
settings.gradle file
include ':app'
project's build.gradle file
buildscript {
repositories {
google()
mavenCentral()
(...)
}
dependencies {
(...)
classpath 'com.google.firebase:firebase-crashlytics-gradle:2.9.0'
classpath 'com.google.android.gms:oss-licenses-plugin:0.10.5'
}
}
(...)
module's build.gradle file
apply plugin: 'com.android.application'
apply plugin: 'com.google.firebase.crashlytics'
apply plugin: 'com.google.android.gms.oss-licenses-plugin'
(...)
And here are partially modified new gradle files:
settings.gradle file
pluginManagement {
repositories {
gradlePluginPortal()
google()
mavenCentral()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
}
}
rootProject.name = "xxxx"
include ':app'
project's build.gradle file
plugins {
id 'com.android.application' version '7.3.1' apply false
id 'com.google.firebase.crashlytics' version '2.9.2' apply false
// DOESN'T WORK:
id 'com.google.android.gms.oss-licenses-plugin' version '0.10.5' apply false
}
(...)
module's build.gradle file
plugins {
id 'com.android.application'
id 'com.google.firebase.crashlytics'
// NEED TO SET SAME ID AS IN PROJECT'S GRADLE FILE PROBABLY:
id 'com.google.android.gms.oss-licenses-plugin'
(...)
}
Problem lays in how to get gradle plugin id for given plugin?
Many plugin installation instructions use the old apply plugin approach and I don't want to mix both of them.
For example in case of Crashlytics with classpath of com.google.firebase:firebase-crashlytics-gradle, the id is com.google.firebase.crashlytics - how was I supposed to know that? I found this in one of the answers on Stackoverflow, but without information about how someone knew that.
Currently I am trying to add the oss-licenses-plugin and I am completly clueless as about how to find its gradle plugin id...
Any suggestions?
Or maybe it is not guaranteed that every plugin added with use of classpath can be translated to the new plugins { } way? In this case, how can I tell it is this situation?

There's a certain pattern that plugin publishers need to follow in order for Gradle to find the plugin implementation. A properties file needs to be included in the JAR's META-INF/gradle-plugins directory. And the name of this file needs to be formatted in the following way:
<plugin-id>.properties
And inside this file, the plugin implementation is defined:
implementation-class=<com.example.SomePluginImpl>
So, to answer your question, you'll need to get a hold of the JAR & look at its contents to figure out the id: META-INF/gradle-plugins/<plugin-id>.properties.
For com.google.android.gms.oss-licenses-plugin, I checked here: Link. Alternatively, you can grab the JAR from maven, extract its contents & check the properties file: Link.
The other issue with your code is that for external plugin resolution, you need to define a resolutionStrategy under pluginManagement:
pluginManagement {
resolutionStrategy {
eachPlugin {
if (requested.id.id == 'com.google.android.gms.oss-licenses-plugin') {
useModule "com.google.android.gms:oss-licenses-plugin:${requested.version}"
}
}
}
repositories {
gradlePluginPortal()
google()
mavenCentral()
}
}
Now you should be able to use id 'com.google.android.gms.oss-licenses-plugin' version '0.10.5' apply false in your project-level build.gradle.

according to gradle docs, you can find the plugin registered in here
not all gradle plugin available, because the dev need to publish their plugin to gradle first, here how to publish the plugin https://plugins.gradle.org/docs/publish-plugin
edit :
I tried to find oss-licenses-plugin, no luck with that. So you should use the old method to apply the plugin.
other info : What the difference in applying gradle plugin

Failed to apply 'io.fabric' plugin on Android

I'm trying to add Firebase Crashlytics.
Firebase Crashlytics tutorial is very simple:
https://firebase.google.com/docs/crashlytics/get-started?authuser=0
I've already added repositories (in buildscript and in all projects), as well as classpath and implementation of dependency. All just like in the tutorial. But when I applying 'io.fabric' plugin (apply plugin: 'io.fabric') and pressing 'Sync' in Android Studio - next error is shown:
A problem occurred evaluating project ':app'.
> Failed to apply plugin [id 'io.fabric']
> No such property: verboseGradlePlugin for class: java.lang.String
I'm applying plugin after "apply plugin: 'com.android.application'".
Tried to add Fabric plugin to Android Studio - didn't help.
Tried all plugin versions down to 1.24.0. (Current is 1.25.4)
Invalidated caches and restarted Android Studio.
Tried to add 'fabric.properties' file to app folder as well as 'crashlytics.properties' file.
Tried to pass -DverboseGradlePlugin=false or with 'true' to gradle's 'build' task.
Gradle knows about 'io.fabric' plugin, but trying to find 'verboseGradlePlugin' property that is missing. I haven't found any info about such issue in the google.
Maybe someone already faced the same problem or have any suggestions how to solve this?
UPD:
My project-level build.gradle
My app-level build.gradle
Gradle version - 4.4
Android gradle plugin version - 3.1.2

Step1:
In your project level build.gradle add:
maven {
url 'https://maven.fabric.io/public'
}
NB:This addition should strictly be pasted inside your buildscript and not your allprojects gradle script as follows:
buildscript {
repositories {
jcenter()
google()
maven {
url 'https://maven.fabric.io/public'
}
}
Next,add your io.fabric tools into your dependencies in the same gradle(build.gradle)
dependencies {
classpath 'com.android.tools.build:gradle:3.1.2'
classpath 'com.google.gms:google-services:3.2.1'
classpath 'io.fabric.tools:gradle:1.25.4'
}
As soon as this is done,Sync your gradle before moving onto the next step.You should have something like this for step1
Step2:In your app level build.gradle add
apply plugin: 'io.fabric'
And in your dependencies:
dependencies {
// ...
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.3'
}
Now Sync again and Rebuild and Run your project.
NB:Sync right after manipulating the project level build.gradle before manipulating your app level.
More details here

I had exactly the same problem. The error is generated due to the extra property "crashlytics" in the project-level build.gradle, which generates a conflict.
Simply change the extra property "crashlitycs" to "crashlyticsVersion" or something similar and the error disappears.
I also recommend that you use the suffix "Version" in the extra properties to avoid similar errors.

In your project gradle you should put
buildscript {
repositories {
...
maven {url 'https://maven.fabric.io/public'}
}
...
}
Meanwhile in the app gradle file in the top
apply plugin: 'io.fabric'
and as dependencies
implementation 'com.crashlytics.sdk.android:crashlytics:2.9.3'

Gradle cant find plugin

I am trying to import an external library into my application, the library is FFmpeg. Here is a link to the module.
I add the library to my libs folder (after downloading it), then from File > New > Import module > select FFmpeg. Now within my apps build gradle I add the line
compile project(':FFmpeg')
Now when I try and sync the project I get this error:
Error:(2, 0) Plugin with id 'com.github.dcendents.android-maven' not found.
When I open the file, this is the affected line
apply plugin: 'com.github.dcendents.android-maven'
Basically my end goal is to get the above lib into my project as an external library so I can modify the source code to fix some bugs within the library.
Any help is much appreciated, I have been trying to fix this problem for a really long time but I am not too good with Gradle besides just using dependencies.
Update 1
Apply problems are now fixed however it cant find variables like version name and rootProject.ext.compileSdkVersion as Integer
Error:(6, 0) Could not get unknown property 'VERSION_NAME' for project ':FFmpegAndroid' of type org.gradle.api.Project.

You need to add the plugin to your classpath root build.gradle. You can found it in the Gradle Android Maven plugin. Something like this:
buildscript {
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
// This is the classpath for the plugin
classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
}
}
allprojects {
repositories {
jcenter()
}
}
UPDATED:
You should look at the ffmpeg android gradle.properties and add it to your root project, here it is:
VERSION_NAME=0.3.2
VERSION_CODE=28
GROUP=com.writingminds
POM_DESCRIPTION=Java implementation of ffmpeg for Android
POM_URL=https://github.com/writingminds/ffmpeg-android-java
POM_SCM_URL=https://github.com/writingminds/ffmpeg-android-java.git
POM_SCM_CONNECTION=scm:https://github.com/writingminds/ffmpeg-android-java.git
POM_SCM_DEV_CONNECTION=scm:https://github.com/writingminds/ffmpeg-android-java.git
POM_LICENCE_NAME=GNU GPLv3
POM_LICENCE_URL=https://github.com/writingminds/ffmpeg-android-java/blob/master/LICENSE.GPLv3
POM_LICENCE_DIST=repo
POM_DEVELOPER_ID=hiteshsondhi88
POM_DEVELOPER_NAME=Hitesh Sondhi
The VERSION_NAME is needed in the Ffmpeg Android build.gradle:
apply plugin: 'com.android.library'
apply plugin: 'com.github.dcendents.android-maven'
apply plugin: "com.jfrog.bintray"
// This is the library version used when deploying the artifact
version = VERSION_NAME
...
ADVICE:
It's better if you run the ffmpeg-android-java as independent project and then configure it so it can be installed to local maven. Read the details at my answer https://stackoverflow.com/a/46330142/4758255

You have to add the plugin in your buildscript block. You can add in the top-level build.gradle file or in your module/build.gradle
buildscript {
repositories {
jcenter()
}
dependencies {
//..current plugins
classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
}
}
About the variables not found you have to check the build.gradle in the library on github
You have to define in your project these variables. Of course use your values.
ext {
compileSdkVersion = 22
buildToolsVersion = '22.0.1'
targetSdkVersion = 22
minSdkVersion = 16
versionCode = 28
versionName = "0.3.2"
}

Android Studio. Top-level build.gradle

I downloaded Android Studio project. At the root of the project only one build.gradle with next structure:
apply plugin: 'com.android.library'
android {
}
dependencies {
}
When I run build.gradle script I get the error:
Plugin with id 'com.android.library' not found.
I know that there must be another Top-level gradle file like this:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.2'
}
}
allprojects {
repositories {
jcenter()
}
}
But it is not present.
How can i add this build file? Or maybe another way to fix this problem?
The project was created in the old version of android studio. Perhaps he had worked for another way in old version? I am waiting for help. Thank you.

You have downloaded a single module (library).
You can use it in an Android Studio project building a structure like this.
Just create an empty new project and add your module.
root
|--build.gradle //top level
|--settings.gradle
|--mymodule //your module downloaded
|----build.gradle
In settings.gradle
include ':mymodule'

Just add the top level build.gradle content to the top of the downloaded projects' build.gradle.
The project you downloaded is most likely being imported into another project, and thus does not need a top level build.gradle file as it will inherit it from the project it is imported into.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.2'
}
}
allprojects {
repositories {
jcenter()
}
}
apply plugin: 'com.android.library'
android {
}
dependencies {
}

Error:Plugin with id 'com.github.dcendents.android-maven' not found

I'm using this library in my Android app. (https://github.com/yazeed44/MultiImagePicker)
Before now, I was adding it to my project this way:
compile 'net.yazeed44.imagepicker:imagepicker:1.3.0'
The problem with importing it that way is, as far as I know, that I can't override any code because I'll lose all the changes after building the project again. (I need to change some code)
For that reason, I have downloaded the source code and I've imported the project as a module with this name: 'imagepicker'
After that, I added this line to my app build.gradle:
compile project(':imagepicker')
and this to my settings.gradle (Android Studio did it)
include ':app', ':imagepicker'
After doing that, I try to run the project and Android studio shows this error:
Gradle 'Project' project refresh failed
Error:Plugin with id 'com.github.dcendents.android-maven' not found.

Since you are using the module locally you have to add in your top-level build.gradle or in the imagepicker/build.gradle same config added in the imagepicker build.gradle project.
buildscript {
repositories {
jcenter()
}
dependencies {
//ADD THESE DEPENDENCIES
classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.2'
classpath 'com.github.dcendents:android-maven-gradle-plugin:1.3'
}
}
An alternative can be modify the imagepicker/build.gradle removing the last 2 lines. But you have to test this way.
apply from: 'https://raw.githubusercontent.com/nuuneoi/JCenter/master/installv1.gradle'
apply from: 'https://raw.githubusercontent.com/nuuneoi/JCenter/master/bintrayv1.gradle'
If you check these files you will find the
apply plugin: 'com.github.dcendents.android-maven'
In your case you don't need these files because they are useful only to uplaod in a maven repo the aar file.

I added below code in Project:gradle.build file and its resolved the problem :
allprojects {
repositories {
jcenter()
maven {
url "https://repo.commonsware.com.s3.amazonaws.com"
}
}
}
EDIT
If you still facing after adding above maven dependencies
Change url "https://repo.commonsware.com.s3.amazonaws.com" to url "https://s3.amazonaws.com/repo.commonsware.com".