feat: migrate library to Kotlin (Roadmap #1)

- Converted all Java files in shinebuttonlib to Kotlin
- Updated build configuration to support Kotlin
- Improved null safety and idiomatic code
- Bumped version to 0.3.0
- Updated README.md roadmap

Author: ChadCSong

CHANGELOG.md

@@ -2,6 +2,15 @@
 
 All notable changes to this project will be documented in this file.
 
+## [0.3.0] - 2026-06-13
+
+### Added
+- **Kotlin Migration**: Fully converted the library module (`shinebuttonlib`) to Kotlin.
+- Improved null safety and idiomatic Kotlin code.
+
+### Changed
+- Updated library version to 0.3.0.
+
 ## [0.2.1] - 2026-06-13
 
 ### Added

README.md

@@ -26,7 +26,7 @@ Add the dependency to your `app/build.gradle` file:
 
 ```gradle
 dependencies {
-    implementation 'com.sackcentury:shinebutton:0.2.1'
+    implementation 'com.sackcentury:shinebutton:0.3.0'
 }
 ```
 
@@ -36,7 +36,7 @@ dependencies {
 <dependency>
   <groupId>com.sackcentury</groupId>
   <artifactId>shinebutton</artifactId>
-  <version>0.2.1</version>
+  <version>0.3.0</version>
   <type>aar</type>
 </dependency>
 ```
@@ -117,7 +117,7 @@ shineButton.setFixDialog(dialog);
 
 We are continuously working to improve ShineButton. Here is what we have planned:
 
-- [ ] **Kotlin Migration**: Fully convert the library to Kotlin for better safety and modern features.
+- [x] **Kotlin Migration**: Fully convert the library to Kotlin for better safety and modern features.
 - [ ] **Jetpack Compose**: Provide a native Composable version of ShineButton.
 - [ ] **Vector Support**: Allow using `VectorDrawable` as shape masks.
 - [ ] **Custom Animators**: Support for custom easing and path-based animations.

build.gradle

@@ -12,6 +12,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:7.4.2'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.20"
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

gradle.properties

@@ -17,8 +17,8 @@
 # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
 # org.gradle.parallel=true
 org.gradle.jvmargs=-Xmx1536M
-VERSION_NAME=0.2.1
-VERSION_CODE=11
+VERSION_NAME=0.3.0
+VERSION_CODE=12
 POM_GROUP_ID=com.sackcentury
 POM_DESCRIPTION=This is a UI lib for Android. Effects like shining.
 POM_URL=https://github.com/ChadCSong/ShineButton

shinebuttonlib/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 
 android {
     namespace "com.sackcentury.shinebuttonlib"
@@ -7,8 +8,8 @@ android {
     defaultConfig {
         minSdkVersion 14
         targetSdkVersion 34
-        versionCode 11
-        versionName "0.2.1"
+        versionCode 12
+        versionName "0.3.0"
 
     }
     compileOptions {
@@ -25,6 +26,7 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.7.20"
     testImplementation 'junit:junit:4.13.2'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.github.MasayukiSuda:EasingInterpolator:v1.3.2'