在构建使用 Room 库、用于依赖注入的 Dagger 和 Kotlin 的项目时,我遇到了这个错误:
[kapt] 发生异常:java.lang.IllegalArgumentException: voidcannot be convert to an Element
这是我的代码:
@Entity(tableName = "contacts_table")
data class Contact(@PrimaryKey var cid: Long,
@ColumnInfo(name = "firstColor") var firstColor: String?,
@ColumnInfo(name = "secondColor") var secondColor: String?,
@ColumnInfo(name = "avatarUrl") var avatarUrl: String?,
@ColumnInfo(name = "name") var name: String,
@ColumnInfo(name = "nickname") var nickname: String)
@Dao
interface ContactsDao {
@Insert(onConflict = REPLACE)
fun insertContact(contact: Contact)
@Query("delete from contacts_table where cid=:id")
fun deleteContactById(id: Long)
@Query("select * from contacts_table")
fun getAllContacts() : List<Contact>
}
@Database(entities = [Contact::class], version = 1, exportSchema = false)
abstract class AppDatabase : RoomDatabase() {
abstract fun contactsDao()
}
这是我如何使用 DAO 的示例:
contactsDao.insertContact(Contact(response.id, response.firstColor, response.secondColor,
null, response.name, response.nickname))
contactsDao.insertContact(Contact(response.id, null, null, response.avatarUrl,
response.name, response.nickname))
如何修复此构建错误?