How insert image in room persistence library?

Question

I am using room persistence library for my android application, Now I have to insert image in my db. I successfully define @Entity for the primitive data type. and also thro

Answer 1

As Pinakin mentioned, it is not recommended to store an image into database and file path would be better but if it is required to store image I would suggest compress the image to below 2 MB (here is an example) to avoid breaking app. Room supports BLOB for image. Entity class in kotlin:

ImageTest.kt

 @Entity    
 class ImageTest {

        @PrimaryKey(autoGenerate = true)

        var id: Int = 1

        @ColumnInfo(typeAffinity = ColumnInfo.BLOB)
        var data: ByteArray? = null
      }

ImageDao.kt

 @Dao
 interface ImageTestDao {

       @Insert(onConflict = OnConflictStrategy.REPLACE)
       fun upsertByReplacement(image: List)

       @Query("SELECT * FROM image")
       fun getAll(): List

       @Query("SELECT * FROM image WHERE id IN (:arg0)")
       fun findByIds(imageTestIds: List): List

       @Delete
       fun delete(imageTest: ImageTest)
   }

Databse.kt

 import android.arch.persistence.room.Database
 import android.arch.persistence.room.RoomDatabase
 import android.arch.persistence.room.TypeConverters

   @Database(entities = arrayOf(ImageTest::class), version = 1)
   @TypeConverters(DataConverters::class)
   abstract class Database : RoomDatabase() {
    abstract fun getImageTestDao(): ImageTestDao
   }
    

In DatabaseHelper something like

  class DatabaseHelper(context: Context) {

   init {
        DatabaseHelper.context = WeakReference(context)
        }

   companion object {
    
   private var context: WeakReference? = null
   private const val DATABASE_NAME: String = "image_test_db"
   private var singleton: Database? = null

   private fun createDatabase(): Database {
       return Room.databaseBuilder(context?.get() ?:
               throw IllegalStateException("initialize by calling  
               constructor before calling DatabaseHelper.instance"),
               Database::class.java,
               DATABASE_NAME)
               .build()
   }


   val instance: Database
       @Synchronized get() {
           if (null == singleton)
               singleton = createDatabase()

           return singleton as Database
       }

     fun setImage(img: Bitmap){
     val dao = DatabaseHelper.instance.getImageTestDao() 
     val imageTest = ImageTest()
     imageTest.data = getBytesFromImageMethod(image)//TODO
     dao.updsertByReplacement(imageTest)

     fun getImage():Bitmap?{
     val dao = DatabaseHelper.instance.getImageTestDao() 
     val imageByteArray = dao.getAll()
     return loadImageFromBytes(imageByteArray[0].data)
     //change accordingly 
     }

Correct me if I am wrong. Hope this helps someone out there