突然我开始得到这个错误，我不知道为什么如果有人告诉我这个错误在哪里，就足够有帮助了。正如我所能得到的，这是因为android studio的新更新。
我得到的错误的详细总结。
Task :app:kaptDebugKotlin
ANTLR Tool version 4.5.3 used for code generation does not match the current runtime version 4.7.1ANTLR Runtime version 4.5.3 used for parser compilation does not match the current runtime version 4.7.1ANTLR Tool version 4.5.3 used for code generation does not match the current runtime version 4.7.1ANTLR Runtime version 4.5.3 used for parser compilation does not match the current runtime version 4.7.1C:\Users\shubh\Downloads\MarginCalculator\app\build\generated\source\kapt\debug\com\kotlin_developer\margincalculator\DataBinderMapperImpl.java:10: error: cannot find symbol
import com.kotlin_developer.margincalculator.databinding.FragmentCalculatorScreenBindingImpl;
symbol: class FragmentCalculatorScreenBindingImpl
Task :app:kaptDebugKotlin FAILED
location: package com.kotlin_developer.margincalculator.databinding
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:kaptDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptExecution
> java.lang.reflect.InvocationTargetException (no error message)
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 17s
29 actionable tasks: 27 executed, 2 up-to-date
大声喊出上面@Rene Spies的回答，我在使用数据绑定时也得到了这个错误。当您将@Bindable注释放在Kotlin中数据类的主构造函数的字段上时，构建引擎不喜欢这样做。
所以不要做下面的事情，
data class MyAwesomePojo(
@Bindable
var firstname: String,
var lastname: String
)
相反，你需要做的是
data class MyCorrectAwesomePojo(
var lastname: String
):{
@get:Bindable
var firstname: String
set(value){
field = value
}
}
好处:如果你像我一样试图使用双向绑定来防止设置和获取的无限循环，请记得在设置值到字段之前检查相同的值。
我有一个枚举在我的实体属性使用房间。经过长时间的搜索，导致如下失败。
“:app:kaptDebugKotlin”任务执行失败。
执行org.jetbrains.kotlin.gradle.internal.KaptExecution时发生失败
invocationtargetexception(没有错误消息)
enum class Color{RED,BLACK,BLUE,GREEN,WHITE}
@Entity(tableName = "flower_table")
data class Flower(
@PrimaryKey(autoGenerate = true) val id: Int,
@ColumnInfo(name = "name") val name: String,
@ColumnInfo(name = "color") val color: Color)
val flower = Flower(2, "rose", Color.RED)
我的解决方案是在实体属性中使用枚举的索引。
@Entity(tableName = "flower_table")
data class Flower(
@PrimaryKey(autoGenerate = true) val id: Int,
@ColumnInfo(name = "name") val name: String,
@ColumnInfo(name = "color") val color: Int)
val flower = Flower(4, "tulip", Color.BLUE.ordinal)
希望能对你有所帮助!
PS，不要忘记更新数据库类中的版本号。
@Database(entities = [Flower::class], version = 2)
abstract class FlowerRoomDatabase : RoomDatabase() {
对我来说，问题是在模型上定义了两个主键。
// before
@field:ColumnInfo(name = "id") @field:PrimaryKey(autoGenerate = true) var id: Long = 0,
@field:ColumnInfo(name = "name") @field:PrimaryKey var name: String,
//after
@field:ColumnInfo(name = "id") @field:PrimaryKey(autoGenerate = true) var id: Long = 0,
@field:ColumnInfo(name = "name") @field:NotNull var name: String,
我不得不重新构建项目并稍微更改Dao类以触发有关问题的消息。
