可选插入数据库？

如何解决可选插入数据库？

如果我的标题有点笼统，我深表歉意，但我目前有一个日记应用程序，用户可以在其中创建新条目时选择图像并将其插入到数据库中，该数据库稍后会显示在 recyclerview 中。

class addFragment : Fragment(),EasyPermissions.PermissionCallbacks,EasyPermissions.RationaleCallbacks {
    lateinit var bitmap: Bitmap

    private val mJournalviewmodel: Journalviewmodel by viewmodels()
    private val mSharedviewmodel: Sharedviewmodel by viewmodels()
    var currentDate: String? = null

    override fun onCreateView(
        inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        val view = inflater.inflate(R.layout.fragment_add,container,false)

        // set menu
        setHasOptionsMenu(true)

        view.mood_spinner.onItemSelectedListener = mSharedviewmodel.listener

        // Set date and time for currentDate
        val sdf = SimpleDateFormat("dd/M/yyyy hh:mm a")
        currentDate = sdf.format(Date())

        // Opens gallery when image button clicked,gets image
        view.image_et.setonClickListener {
            readStorageTask()
            //Intent to pick image
            val intent = Intent(Intent.ACTION_PICK)
            intent.type = "image/*"
            startActivityForResult(intent,1001)
        }

        return view
    }

    override fun onSaveInstanceState(outState: Bundle) {
        super.onSaveInstanceState(outState)
        outState.clear()
    }

    // Handle result of picked image
    override fun onActivityResult(requestCode: Int,resultCode: Int,data: Intent?) {
        if (resultCode == Activity.RESULT_OK && requestCode == 1001) {

            // Converts image URI to bitmap
            if (data != null && data.data != null) {
                val uri = data.data!!
                val inputStream = requireContext().contentResolver.openInputStream(uri)
                val cursor = requireContext().contentResolver.query(uri,null,null)
                cursor?.use { c ->
                    val nameIndex = c.getColumnIndex(OpenableColumns.disPLAY_NAME)
                    if (c.movetoFirst()) {
                        val name = c.getString(nameIndex)
                        inputStream?.let { inputStream ->
                            // create same file with same name
                            val file = File(requireContext().cacheDir,name)
                            val os = file.outputStream()
                            os.use {
                                inputStream.copyTo(it)
                            }
                            val bitmapUnprocessed = BitmapFactory.decodeFile(file.absolutePath)
                            bitmap = resizedBitmap(bitmapUnprocessed)
                            preview_image.setimageBitmap(bitmap)
                            image_et.text = "Image picked!"
                        }
                    }
                }
            }
        }
    }

    // Creates check mark at the top of the fragment
    override fun onCreateOptionsMenu(menu: Menu,inflater: MenuInflater) {
        inflater.inflate(R.menu.add_fragment_menu,menu)
    }

    // If the check mark is clicked,entry gets added
    override fun onoptionsItemSelected(item: MenuItem): Boolean {
        if(item.itemId == R.id.menu_add) {
            insertDataToDb()
        }
        return super.onoptionsItemSelected(item)
    }


    // uses below function to check if text is empty,and gets values from add fragment
    private fun insertDataToDb() {
        val mTitle = title_et.text.toString()
        val mMood = mood_spinner.selectedItem.toString()
        val mDescription = description_et.text.toString()
        val mDate = currentDate.toString()

        val validation = mSharedviewmodel.verifyDataFromUser(mTitle,mDescription)
        if(validation) {
            val newData = JournalData(
                0,mTitle,parseMood(mMood),mDescription,mDate,bitmap
            )
            mJournalviewmodel.insertData(newData)
            Toast.makeText(requireContext(),"New entry added!",Toast.LENGTH_SHORT).show()
            findNavController().navigate(R.id.action_addFragment_to_listFragment) // Jetpack Navigation
        } else {
            Toast.makeText(requireContext(),"You have some empty fields.",Toast.LENGTH_SHORT).show()
        }
    }

这是这些值插入的数据库：

@Entity(tableName = "journal_table")
@Parcelize
data class JournalData(
    @PrimaryKey(autoGenerate = true)
    var id: Int,var title: String,var mood: Mood,var description: String,var date: String,var image: Bitmap
): Parcelable

问题

如果用户没有选择图片，我的应用程序就会崩溃并且通常无法正常工作（如预期的那样）。有什么方法可以使每个条目中的位图/图像在插入所有其他值时保持为空或为空而不会导致任何错误？

基本上，我试图在将日记条目设为可选时附加图像，但我不确定如何做到这一点。

我对使用房间数据库还很陌生，几天来我一直在努力寻找解决方案，因此我们将不胜感激！

解决方法

如果您的图像没有被拍摄，那么您可以通过在数据库插入之前添加检查来停止插入，或者如果即使图像为空也想插入，那么您可以简单地在房间数据实体类中添加位图的默认值>

var image: Bitmap?=null