File Multiple Selector Helper

FileMultipleSelectorHelper.kt

import android.Manifest
import android.net.Uri
import android.os.Build
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.fragment.app.Fragment

class FileMultipleSelectorHelper(
    fragment: Fragment,
    val fileDataType: Companion.FileDataType,
    maxFileSizeInBytesValidation : Int? = null,
    onMultipleFilesSelected: (List<ByteArray?>, List<Uri?>, isAnyInvalidFileSize : Boolean) -> Unit
) : FileSelectorHelper(fragment, fileDataType, maxFileSizeInBytesValidation, { _, _, _->}) {

    private val galleryLauncher: ActivityResultLauncher<Array<String>>

    init {
        with(fragment) {
            galleryLauncher =
                registerForActivityResult(
                    ActivityResultContracts.OpenMultipleDocuments()
                ) { listOfUris ->
                    val listOfFileBytes = listOfUris.map { uri -> uri.let { requireContext().contentResolver.openInputStream(uri)?.readBytes() } }
                    val isAnyInvalidFileSize = listOfFileBytes.any { (it?.size ?: 0) > (maxFileSizeInBytesValidation ?: Int.MAX_VALUE) }
                    if (listOfFileBytes.isNotEmpty())
                        onMultipleFilesSelected.invoke(listOfFileBytes, listOfUris, isAnyInvalidFileSize)
                }

            galleryPermissionLauncher = registerForActivityResult(
                ActivityResultContracts.RequestMultiplePermissions()
            ) {
                if (it.all { it.value })
                    galleryLauncher.launch(fileDataType.supportedTypesIntents.toTypedArray())
            }

        }

    }

    override fun openGallery() {
        checkStoragePermission().let { hasStoragePermission ->
            if (hasStoragePermission)
                galleryLauncher.launch(fileDataType.supportedTypesIntents.toTypedArray())
            else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) // -> https://developer.android.com/about/versions/13/behavior-changes-13#granular-media-permissions
                galleryPermissionLauncher.launch(arrayOf(Manifest.permission.READ_MEDIA_IMAGES, Manifest.permission.READ_MEDIA_VIDEO))
            else
                galleryPermissionLauncher.launch(arrayOf(Manifest.permission.READ_EXTERNAL_STORAGE))
        }
    }
}