1、創建Android項目
2、把MainActivity通過code→Convert Java file to Kotlin File
3、Configure Kotlin in project(點兩下Shift搜索),並修改build.gradle(project)和build.gradle(Moudle:app)裏的kotlin版本,要注意的是分別要有classpath "org.jetbrains.kotlin:kotlin-android-extensions:1.0.3"和apply plugin: ‘kotlin-android-extensions’