我需要获取'id'值，每当我使用以下函数在数据库中添加新行时，该值会自动生成。

TaskItem.kt

@Entity(tableName = "task_item_table")
class TaskItem(
    // Date Info
    @ColumnInfo(name = "hour") var hour: Int, // Hours
    @ColumnInfo(name = "minutes") var minutes: Int, // Minutes
    @ColumnInfo(name = "totalMinutes") var totalMinutes: Int, // HoursId (total of minutes, for sorting)
    // Sound Info
    @ColumnInfo(name = "withMusic") var withMusic: Boolean, // With Music at the end
    @ColumnInfo(name = "isActive") var isActive: Boolean, // If it will ring
    // Sound Volume
    // @ColumnInfo(name = "volume") var volume: Int, // If it will ring

    @PrimaryKey(autoGenerate = true) var id: Int = 0
)

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正如你所看到的，主键总是有一个唯一的整数。

TaskItemDao.kt

@Dao
interface TaskItemDao
{
    @Query("SELECT * FROM task_item_table ORDER BY id ASC")
    fun allTaskItems(): Flow<MutableList<TaskItem>>

    @Query("UPDATE task_item_table SET isActive=:newActiveValue WHERE isActive=:isActive")
    suspend fun setAllAlarmsTaskItem(isActive: Boolean, newActiveValue: Boolean)

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertTaskItem(taskItem: TaskItem)

    @Update
    suspend fun updateTaskItem(taskItem: TaskItem)

    @Delete
    suspend fun deleteTaskItem(taskItem: TaskItem)
}

型

TaskItemRepository.kt

class TaskItemRepository(private val taskItemDao: TaskItemDao)
{
    val allTaskItems: Flow<MutableList<TaskItem>> = taskItemDao.allTaskItems()

    @WorkerThread
    suspend fun insertTaskItem(taskItem: TaskItem)
    {
        taskItemDao.insertTaskItem(taskItem)
    }

    @WorkerThread
    suspend fun updateTaskItem(taskItem: TaskItem)
    {
        taskItemDao.updateTaskItem(taskItem)
    }

    @WorkerThread
    suspend fun deleteTaskItem(taskItem: TaskItem)
    {
        taskItemDao.deleteTaskItem(taskItem)
    }

    @WorkerThread
    suspend fun setAllAlarmsTaskItem(isActive: Boolean, newActiveValue: Boolean)
    {
        taskItemDao.setAllAlarmsTaskItem(isActive, newActiveValue)
    }
}

型

TaskViewModel.kt

class TaskViewModel(private val repository: TaskItemRepository): ViewModel()
{
    val taskItems: LiveData<MutableList<TaskItem>> = repository.allTaskItems.asLiveData()
    private lateinit var taskViewModel: TaskViewModel

    fun addTaskItem(taskItem: TaskItem) = viewModelScope.launch {
        repository.insertTaskItem(taskItem)
    }
    
    fun updateTaskItem(taskItem: TaskItem) = viewModelScope.launch {
        repository.updateTaskItem(taskItem)
    }

    fun deleteTaskItem(taskItem: TaskItem) = viewModelScope.launch {
        repository.deleteTaskItem(taskItem)
    }

    fun setAllAlarmsTaskItem(isActive: Boolean, newActiveValue: Boolean) = viewModelScope.launch {
        repository.setAllAlarmsTaskItem(isActive, newActiveValue)
    }

    fun setCompleted(taskItem: TaskItem) = viewModelScope.launch {

        repository.updateTaskItem(taskItem)
    }

}

class TaskItemModelFactory(private val repository: TaskItemRepository) : ViewModelProvider.Factory
{
    override fun <T : ViewModel> create(modelClass: Class<T>): T
    {
        if (modelClass.isAssignableFrom(TaskViewModel::class.java))
            return TaskViewModel(repository) as T

        throw IllegalArgumentException("Unknown ViewModel class")
    }
}

型

NewTaskSheet.kt

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    val activity = requireActivity()

    binding.tvGuardar.setOnClickListener {
        saveAction()
    }

}

private fun saveAction(){

    // ... some more code
    if (taskItem == null)
    {
        val newTask = TaskItem(hour, minutes, totalMinutes, withMusic, isActive)
        taskViewModel.addTaskItem(newTask)
        // Here is where i need to get the id value, so i can passed to my alarm service

    }
    // ... some more code
        alarmService.setRepetitiveAlarm(timeInMilis, musicHour, musicMinutes, withMusic)

}

型
我试过使用以下函数，但没有成功：所以基本上我只是在每个函数中返回。

TaskViewModel.kt

这是我认为导致问题的函数，因为它使程序崩溃：

fun addTaskItem(taskItem: TaskItem): Long {
    // return@async repository.insertTaskItem(taskItem)
    return runBlocking(viewModelScope.coroutineContext) {
        return@runBlocking repository.insertTaskItem(taskItem)
    }
}

// Also tried with this function.
// This one didn't crashed it just return some sort of string that
// didn't contained the id that I was looking for
fun addTaskItem(taskItem: TaskItem): Deferred<Long> = viewModelScope.async {
    return@async repository.insertTaskItem(taskItem)
}

型

TaskItemRepository.kt

@WorkerThread
suspend fun insertTaskItem(taskItem: TaskItem): Long
{
    return taskItemDao.insertTaskItem(taskItem)
}

型

TaskItemDao.kt

我读到，通过返回Long，它会自动返回主键的值。

@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertTaskItem(taskItem: TaskItem): Long

型
我希望能够有'id'值（primarykey），它被赋予了相应的创建行，这样我就可以使用它作为我的pendingIntents的requestCode。

private fun getPendingIntent(intent: Intent) =
    PendingIntent.getBroadcast(
        context,
        0, // Here is where the id should be
        intent,
        //PendingIntent.FLAG_NO_CREATE or PendingIntent.FLAG_IMMUTABLE
        PendingIntent.FLAG_UPDATE_CURRENT

    )

型
或者有没有另一种正确处理“请求代码”的策略？
我的应用程序是一个闹钟，所以每个闹钟都必须有一个唯一的代码，将被保存在数据库中，以便以后能够删除创建的闹钟。