[英]Unable to build application with Room in my test App
當我嘗試構建應用程序時,它給了我一個錯誤
Execution failed for task ':app:kaptDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask$KaptExecutionWorkAction
> java.lang.reflect.InvocationTargetException (no error message)
在 build.gradle 我指定
apply plugin: 'kotlin-kapt'
和
implementation "android.arch.persistence.room:runtime:1.1.1"
kapt 'android.arch.persistence.room:compiler:1.1.1'
我的數據庫 class
@Database(entities = [WeatherOfCities::class], version = 1, exportSchema = false)
public abstract class AppDatabase : RoomDatabase(){
public abstract fun weatherOfCitiesDao(): WeatherOfCitiesDao
companion object {
private var INSTANCE: AppDatabase? = null
fun getDatabase(context: Context): AppDatabase {
if (INSTANCE == null) {
synchronized(this) {
INSTANCE =
Room.databaseBuilder(context, AppDatabase::class.java, "database")
.build()
}
}
return INSTANCE!!
}
}
}
我的實體 class
@Entity
data class WeatherOfCities (
@PrimaryKey(autoGenerate = true)
val id: Long,
val city: String,
val weather: Int
)
我的道界面
@Dao
interface WeatherOfCitiesDao {
@Query("SELECT * FROM weatherOfCities")
fun getAll(): List<WeatherOfCities>
@Insert
fun insert(weatherOfCities: WeatherOfCities)
@Update
fun update(weatherOfCities: WeatherOfCities)
}
並在 MainActivity 中構建數據庫
class MainActivity : AppCompatActivity(), MainView {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
var presenter = (application as MVPApplication).mainPresenter
presenter?.attachView(this)
var db = AppDatabase.getDatabase(this)
var weatherOfCitiesDao = db.weatherOfCitiesDao()
}
}
為什么應用程序沒有構建,是由於應用程序代碼中的錯誤嗎?
您需要添加 ktx 依賴項,例如
implementation 'androidx.room:room-ktx:1.1.1'
我還建議對所有房間依賴項使用 2.4.1 而不是 1.1.1
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