Calling Kotlin static method

Hi!
I would like to call a static method in Kotlin from Unity but it's throwing me the famous NoSuchMethodError.
I'm able to call no static functions without problem, and also I can call Java static and non static methods.

I tried the following .kt

Code (CSharp):

1.  
2. package com.example.testkotlin
3. class MyClass {
4.     fun logHello() {
5.         println("Hello from Kotlin")
6.     }
7.  
8.     fun logHelloWithParams(name: String) {
9.         println("Hello from Kotlin $name")
10.     }
11.  
12.     fun returnValue(name: String): String {
13.         return "Hi $name. How Are you?"
14.     }
15.  
16.     companion object {
17.         fun execute() {
18.             println("Executing from inside a companion object")
19.         }
20.     }
21. }

And from C#

Code (CSharp):

1.         const string TEST = "com.example.testkotlin.MyClass";
2.         public static void TestExecute()
3.         {
4.             using (var javaClass = new AndroidJavaClass(TEST))
5.                 javaClass.CallStatic("execute");
6.         }

 

I had to add in the mainTemplate.gradle the kotlin dependency

 

Hello! Can u please tell me how do u added kotlin dependency?

 

Hi @miuoctav

You need to create a mainTemplate.gradle under Assets/Plugins/Android.
If you don't have a mainTemplate already you can go to

/Applications/Unity/Hub/Editor/UNITY_VERSION/PlaybackEngines/AndroidPlayer/Tools/GradleTemplates/mainTemplate.gradle (in Mac)

Inside you will find a dependencies property, you need to add the following dependency:

Code (CSharp):

1. implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.3.72'

 

thanks, dude

 

i copied it, but got an error after copy it in plugins/Android... can u please provide the mainTTemplate pls?

 

This is the mainTemplate.gradle for a 2018.4.16 Unity, but they are similar, just check dependencies property.

Code (CSharp):

1. // GENERATED BY UNITY. REMOVE THIS COMMENT TO PREVENT OVERWRITING WHEN EXPORTING AGAIN
2.  
3. buildscript {
4.     repositories {**ARTIFACTORYREPOSITORY**
5.         mavenCentral()
6.         google()
7.         jcenter()
8.     }
9.  
10.     dependencies {
11.         classpath 'com.android.tools.build:gradle:3.4.0'
12. **BUILD_SCRIPT_DEPS**}
13. }
14.  
15. allprojects {
16.     repositories {**ARTIFACTORYREPOSITORY**
17.         mavenCentral()
18.         google()
19.         jcenter()
20.         flatDir {
21.             dirs 'libs'
22.         }
23.     }
24. }
25.  
26. // Android Resolver Repos Start
27. ([rootProject] + (rootProject.subprojects as List)).each { project ->
28.     project.repositories {
29.         def unityProjectPath = $/file:///**DIR_UNITYPROJECT**/$.replace("\\", "/")
30.         maven {
31.             url "https://maven.google.com"
32.         }
33.         mavenLocal()
34.         jcenter()
35.         mavenCentral()
36.     }
37. }
38. // Android Resolver Repos End
39. apply plugin: 'com.android.application'
40. **APPLY_PLUGINS**
41.  
42. dependencies {
43.     implementation fileTree(dir: 'libs', include: ['*.jar'])
44. // Android Resolver Dependencies Start
45.     implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.3.72'
46. // Android Resolver Dependencies End
47. **DEPS**}
48.  
49. // Android Resolver Exclusions Start
50. android {
51.   packagingOptions {
52.       exclude ('/lib/arm64-v8a/*' + '*')
53.       exclude ('/lib/armeabi/*' + '*')
54.       exclude ('/lib/mips/*' + '*')
55.       exclude ('/lib/mips64/*' + '*')
56.       exclude ('/lib/x86_64/*' + '*')
57.   }
58. }
59. // Android Resolver Exclusions End
60. android {
61.     compileSdkVersion **APIVERSION**
62.     buildToolsVersion '**BUILDTOOLS**'
63.  
64.     compileOptions {
65.         sourceCompatibility JavaVersion.VERSION_1_8
66.         targetCompatibility JavaVersion.VERSION_1_8
67.     }
68.  
69.     defaultConfig {
70.         minSdkVersion **MINSDKVERSION**
71.         targetSdkVersion **TARGETSDKVERSION**
72.         applicationId '**APPLICATIONID**'
73.         ndk {
74.             abiFilters **ABIFILTERS**
75.         }
76.         versionCode **VERSIONCODE**
77.         versionName '**VERSIONNAME**'
78.     }
79.  
80.     lintOptions {
81.         abortOnError false
82.     }
83.  
84.     aaptOptions {
85.         noCompress = ['.unity3d', '.ress', '.resource', '.obb'**STREAMING_ASSETS**]
86.     }**SIGN**
87.  
88.     buildTypes {
89.         debug {
90.             minifyEnabled **MINIFY_DEBUG**
91.             useProguard **PROGUARD_DEBUG**
92.             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'**USER_PROGUARD**
93.             jniDebuggable true
94.         }
95.         release {
96.             minifyEnabled **MINIFY_RELEASE**
97.             useProguard **PROGUARD_RELEASE**
98.             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-unity.txt'**USER_PROGUARD****SIGNCONFIG**
99.         }
100.     }**PACKAGING_OPTIONS****SPLITS**
101. **BUILT_APK_LOCATION**
102.     bundle {
103.         language {
104.             enableSplit = false
105.         }
106.         density {
107.             enableSplit = false
108.         }
109.         abi {
110.             enableSplit = true
111.         }
112.     }
113. }**SPLITS_VERSION_CODE****REPOSITORIES****SOURCE_BUILD_SETUP**
114.  

 

after one week banging my head against the wall, your postings brings me to success.
If you were around I would invite you for a beer!!!
Thanks a lot!

 

Really happy to hear that! :beers:

 

Can you do it without mainTTemplate? I want another way to do this, without mainTemplate.

 

If you are using External Dependency Manager you can create a dependency xml and add the kotlin dependency needed

implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.3.72'