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android - 如何将图像从服务器（api）存储到房间数据库

问题描述

我想将来自 api 的图像存储到房间 db 中。我从 api 接收数据和图像。当我处于在线模式时，图像是使用 api 提供的 url 加载的，但是当我处于离线状态时，应该在离线模式下从数据库中存储和检索图像。

我像这样加载图像（它加载图像）：----

 if (!data.data.images.isNullOrEmpty()) {

            val base = BuildConfig.SERVER_URL.replace("api/", "")

            data.data.images.forEachIndexed { pos, it ->

                Glide.with(this)
                    .asBitmap()
                    .load(base + it?.imagePath)
                    .into(object : CustomTarget<Bitmap>() {
                        override fun onResourceReady(
                                resource: Bitmap,
                                transition: Transition<in Bitmap>?
                        ) {
                            imageClick = pos + 1
                            val file = File(
                                    getExternalFilesDir(Environment.DIRECTORY_PICTURES),
                                    "${System.currentTimeMillis()}${Constants.PROFILE_PIC_FILE_EXTENSION}"
                            )
                            imagePath = file.absolutePath
                            Utils.saveBitmapToFile(resource, imagePath)
                            Utils.compressImage(imagePath)
                            onCropImageResult(resource)
                        }

                        override fun onLoadCleared(placeholder: Drawable?) {

                        }
                    })
                     }
                     }

我的 JSON 是这样的：--------

 "data" : {
  .
  .
  .
"images" : [ {
  "assetImageId" : 4113,
  "transactionTypeId" : 2,
  "transactionId" : 88341,
  "imageURL" : "",
  "imagePath" : "UserData/AssetImages/INS-0000017673_1616058387618.jpg",
  "createdBy" : 0,
  "createdOn" : "0001-01-01T00:00:00",
  "updatedBy" : null,
  "updatedOn" : null,
  "isActive" : 0,
  "isNew" : false,
  "isDeleted" : false,
  "isChanged" : false,
  "timestamp" : null
}, {
  "assetImageId" : 4114,
  "transactionTypeId" : 2,
  "transactionId" : 88341,
  "imageURL" : "",
  "imagePath" : "UserData/AssetImages/INS-0000017673_1616058402212.jpg",
  "createdBy" : 0,
  "createdOn" : "0001-01-01T00:00:00",
  "updatedBy" : null,
  "updatedOn" : null,
  "isActive" : 0,
  "isNew" : false,
  "isDeleted" : false,
  "isChanged" : false,
  "timestamp" : null
} ],
 }

我的实体表：---

@Entity(tableName = DatabaseConstants.MYTABLE, indices = [Index(value = ["requestId"], unique = true)])
  data class AllocationDetailsByIdEntity(
    var requestId: String? = null,
    var subLocation: String? = null,
    var amsTagId: String? = null,
    var status: String? = null,
    var installedBy: String? = null,
    var installedDate: String? = null,
    val assetTree: String? = null,
    var images: List<ImagesssItem?>? =null,
    @PrimaryKey(autoGenerate = true) var id: Int? = null
   ): Serializable

   @Entity
 data class ImagesssItem (
var assetImageId :String?= null,
var transactionTypeId: Int? = null,
var transactionId: Int? = null,
var imageURL: String? = null,
var imagePath: String? = null
@PrimaryKey(autoGenerate = true) var id : Int? = null

 ):Serializable

尝试过的解决方案1：--这不起作用

    .diskCacheStrategy(DiskCacheStrategy.DATA)

知道如何使用 Room db 存储这些图像 ???????? 需要帮助...在此先感谢

标签： androiddatabasekotlinandroid-roomandroid-glide

解决方案

尝试将其存储为 URI。或者像这样创建一个类型转换器

class Converter {

    @TypeConverter
    fun fromBitmap(bmp: Bitmap): ByteArray {
        val outputStream = ByteArrayOutputStream()
        bmp.compress(Bitmap.CompressFormat.PNG, 100, outputStream)
        return outputStream.toByteArray()
    }

    @TypeConverter
    fun toBitmap(byteArray: ByteArray): Bitmap {
        return BitmapFactory.decodeByteArray(byteArray, 0, byteArray.size)
    }
}

并在你的 roomdb 类中添加这个类型转换器

@TypeConverters(Converter::class)
abstract class RunningDatabase : RoomDatabase() {

  ///


}

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