Develop Reference

Include external libraries in your .aar file (a plugin for Unity)

I came across a problem while implementing an Android plugin for Unity based on EasyPermissions. The issue was due to
Caused by: java.lang.ClassNotFoundException: Didn't find class "pub.devrel.easypermissions.EasyPermissions$PermissionCallbacks"
as the relevant classes were not packed by Android Studio into my AAR file.
I tried various ways:
Just compile in Android Studio and hope the resulting AAR will be fine FAIL
Download an AAR from jCentral and add it to Unity - FAIL
So finally I unzipped the EasyPlugin AAR and took the classes.jar file thats inside and added this to Unity. This worked. Yet its quite a manual process.
What is the tinly little bit I need to add to my gradle file to get this done automatically?
I am using:
https://github.com/googlesamples/easypermissions
Unity 2017.1 (should not matter)
Android Studio 2.3.3
Gradle task used: build->assemble
My Gradle File:
apply plugin: 'com.android.library'
android {
compileSdkVersion 26
buildToolsVersion "27.0.0"
defaultConfig {
minSdkVersion 16
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(include: ['*.jar'], dir: 'libs')
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.+'
testCompile 'junit:junit:4.12'
compile 'pub.devrel:easypermissions:1.0.1'
provided files('unity/classes.jar')
}
PS. There was a second issue when overriding UnityPlayerActivity but for that a clause provided instead of compile was the solution.

Check above comments.
If you use an external library its enough to add its AAR into Plugins/Android directory in Unity.
For some reason I added it in a way that went unnoticed by Unity and Unity was not adding it into resulting APK file.

ZipException duplicate entry: android/support/v4/widget/CursorAdapter$MyDataSetObserver.class

Error:Execution failed for task ':app:transformClassesWithJarMergingForRelease'.
com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: android/support/v4/widget/CursorAdapter$MyDataSetObserver.class - List item
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
dexOptions {
javaMaxHeapSize "4g"
}
defaultConfig {
applicationId "com.omairm.hoops"
minSdkVersion 14
targetSdkVersion 23
multiDexEnabled true
ndk {
moduleName "player_shared"
}
}
sourceSets {
main {
jni.srcDirs = []
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
dependencies {
compile ('com.google.android.gms:play-services:+'){exclude module: 'Support-v4'}
compile files('libs/PTAdRevMob.jar')
compile files('libs/dagger-1.2.2.jar')
compile files('libs/javax.inject-1.jar')
compile files('libs/nineoldandroids-2.4.0.jar')
compile files('libs/support-v4-19.0.1.jar')
}
Do I need to delete the CursorAdapter.class?

You should add something similar to this to your build.gradle, where the duplicate file is added to exclude
android {
configurations {
all*.exclude group: 'com.android.support', module: 'support-v4'
all*.exclude group: 'com.android.support', module: 'support-annotations'
}
}

do i need to delete the cursoradapter.class
It's good that you are reading the error and recognize a least part of what it's telling you, but you can't just delete a class from a JAR file. The build process that Gradle goes through is only throwing the error at the first class conflict it found, and there would be more if you were to only focus on that one.
My suggestion would be to find the correct and current libraries for each of the JAR files you have and remove the jar files as you go.
Also, try to actually use a number value rather than only a plus for the version because you don't want to be using alpha / beta releases of a library that'll change every few weeks
If you search around Maven you can replace most of those JAR files
dependencies {
compile "com.android.support:appcompat-v7:26+"
// Don't use just a plus here
compile ('com.google.android.gms:play-services:+'){exclude module: 'support-v4'}
compile files('libs/PTAdRevMob.jar')
compile group: 'com.squareup.dagger', name: 'dagger', version: '1.2.2'
// compile group: 'com.nineoldandroids', name: 'library', version: '2.4.0'
}
It's also worth mentioning that nineoldandroids is deprecated. Since you're using minSdkVersion 14, I don't think you even need it.
Dagger has also had many releases since version 1.2 but it already includes javax inject framework (see compiled dependencies https://mvnrepository.com/artifact/com.squareup.dagger/dagger/1.2.2)
You'll definitely want to take a look at Google Play | Selectively compiling APIs into your executable too.
Note that if PTAdRevMob.jar has any classes that still conflict with any other library here, you'll still get an error, and will probably need to switch to a different Ad provider

Generate Signed APK Error: Error converting bytecode to dex and 1 more

When I Clean/Rebuild my project or even run app, It doesn't return any errors. But when I generate signed APK, It returns two errors.
Error:Error converting bytecode to dex:
Cause: com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/internal/zzox;
And this one
Error:Execution failed for task ':app:transformClassesWithJarMergingForRelease'.
> com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: com/google/android/gms/internal/zzd.class
Below is the code from build.gradle file.
apply plugin: 'com.android.application'
android {
compileSdkVersion 24
buildToolsVersion "22.0.1"
defaultConfig {
applicationId "com.wildlife.dbd"
minSdkVersion 16
targetSdkVersion 24
versionCode 10
versionName "2.2.2"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
apply plugin: 'com.google.gms.google-services'
dependencies
{
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:24.0.0'
compile 'com.android.support:design:24.0.0'
// FB Ads
compile 'com.facebook.android:audience-network-sdk:4.10.0'
// Analytics
compile 'com.google.android.gms:play-services-analytics:9.0.0'
}

Facebook audience network will pull in play-services as well, so you'll have to exclude it:
I don't remember exactly what Facebook's dependencies are, so your 'analytics' line might not be complete enough for the audience network to run properly. You might want to add the entire play services like so: compile 'com.google.android.gms:play-services:9.2.1', and remove analytics.
Or if you can see exactly which dependencies Facebook requires, you can grab the correct ones here.
compile ('com.facebook.android:audience-network-sdk:4.10.0') {
exclude group: 'com.google.android.gms'
}

java.util.zip.ZipException with spongycastle LICENSE.class

I am trying to include two different 3rd party libs that both seem to include different versions of Spongy castle. Both are included via compile statements in my build.gradle and one is included as an AAR (#aar) while the other is included as normal.
When I try to compile the debug buildType with these 2 libs (sync doesnt show a problem). I see the following,
Error:Execution failed for task
':app:transformClassesWithJarMergingForDebug'.
com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry:
org/spongycastle/LICENSE.class
Been searching around for how to resolve this issue while keeping both the libraries (as both are needed) but have been unable to find a way to do that. Any help from an advanced Android dev or a gradle expert would be greatly appreciated.
Thanks!
[build.gradle]
apply plugin: 'com.android.application'
repositories {
maven { url 'http://mobile-sdk.jumio.com' }
}
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
packagingOptions {
pickFirst 'org/spongycastle/x509/CertPathReviewerMessages.properties'
pickFirst 'org/spongycastle/x509/CertPathReviewerMessages_de.properties'
}
defaultConfig {
applicationId "com.example.me.license"
minSdkVersion 16
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'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile "com.jumio.android:jumio-mobile-sdk:1.9.0#aar"
compile 'com.worldpay:cse-android-sdk:1.0.2'
}

This is what happens if developers include their dependencies directly. The bad guy here is jumio-mobile-sdk. This package includes classes of com.madgag.spongycastle directly, instead of specifying them in a pom as it should be done.
Luckily for you, the other package is set up correctly, so you should be able to exclude spongycastle from it:
compile ('com.worldpay:cse-android-sdk:1.0.2'){
exclude group: 'com.madgag.spongycastle'
}
Now imagine both packages would've included the classes directly. The would've been no other possibility then to manually edit the files. This is why I hate it if someone does what the guys of jumio are doing. If you have the contacts, tell them to prepare their package for dependency systems, so this problem won't arise again.

Guava library duplicate entry error

I am trying to use guava library in my application. But I am also using chromium_webview project from github. This webview project contains guava library.
And I get the following error:
Error:Execution failed for task
':app:packageAllDebugClassesForMultiDex'. java.util.zip.ZipException:
duplicate entry: com/google/common/annotations/GwtIncompatible.class
I've looked at this and this answers already and nothing seems to work.
Here's my module's build.gradle:
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.2"
defaultConfig {
applicationId "my.package.name"
minSdkVersion 16
targetSdkVersion 23
versionCode 1
versionName "1.0"
multiDexEnabled true
}
dexOptions {
incremental true
javaMaxHeapSize "2048M"
jumboMode = true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile files('libs/svgAndroid2-3Jan2014.jar')
compile project(':chromium_webview')
compile 'com.android.support:multidex:1.0.1'
compile 'com.google.guava:guava:18.0'
}
I've tried the exclude method on the chromium_webview project like this:
compile (project(':chromium_webview')) {
exclude group: 'com.google.guava', module: "guava_javalib.jar"
}
and like this:
compile (project(':chromium_webview')) {
exclude module: "guava_javalib.jar"
}
Can I not use the same library again?
Is there a way to use the same library for both modules?
// ======================= EDIT:
Like #petey's comment mentioned, I tried removing just the guava library from my module and my module doesn't read the library in another module.
compile 'com.google.guava:guava:18.0'
that's the line I tried removing.
Any ideas will be really appreciated.
Thank you!!

I actually did fix this problem, forgot to post it.
So the issue here was I was using maven/gradle dependency in my project BUT the chromium_webview library was using an actual JAR file as a library.
I modified the library to use the maven/gradle dependency. Android Studio and Gradle did all the work for me and excluded the necessary classes.
So make sure they both (library and your module) use the same method.
compile 'com.google.guava:guava:18.0'
I really hope this helps someone.
Thank you.