# MbmsDownloadSessionCallback
Added in[API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
# MbmsDownloadSessionCallback
*** ** * ** ***
Kotlin\|[Java](https://developer.android.com/reference/android/telephony/mbms/MbmsDownloadSessionCallback "View this page in Java")
```
open class MbmsDownloadSessionCallback
```
|---|----------------------------------------------------------------------------------------------------------------------------------------------------------|
| [kotlin.Any](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-any/index.html) ||
| ↳ | [android.telephony.mbms.MbmsDownloadSessionCallback](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsDownloadSessionCallback#) |
A callback class that apps should use to receive information on file downloads over cell-broadcast.
## Summary
| Public constructors ||
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| [MbmsDownloadSessionCallback](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsDownloadSessionCallback#MbmsDownloadSessionCallback())`()`
|
| Public methods ||
|----------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onError](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsDownloadSessionCallback#onError(kotlin.Int,%20kotlin.String))`(`errorCode:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `message:` `[String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!`)` Indicates that the middleware has encountered an asynchronous error. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onFileServicesUpdated](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsDownloadSessionCallback#onFileServicesUpdated(kotlin.collections.MutableList))`(`services:` `[MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)<[FileServiceInfo](https://developer.android.com/reference/kotlin/android/telephony/mbms/FileServiceInfo)!>!`)` Called to indicate published File Services have changed. |
| open[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onMiddlewareReady](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsDownloadSessionCallback#onMiddlewareReady())`()` Called to indicate that the middleware has been initialized and is ready. |
## Public constructors
### MbmsDownloadSessionCallback
```
MbmsDownloadSessionCallback()
```
## Public methods
### onError
Added in[API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onError(
errorCode: Int,
message: String!
): Unit
```
Indicates that the middleware has encountered an asynchronous error.
| Parameters ||
|-------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `errorCode` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):Any error code listed in[MbmsErrors](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors)Value is[android.telephony.mbms.MbmsErrors#ERROR_NO_UNIQUE_MIDDLEWARE](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors#ERROR_NO_UNIQUE_MIDDLEWARE:kotlin.Int),[android.telephony.mbms.MbmsErrors#ERROR_MIDDLEWARE_LOST](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors#ERROR_MIDDLEWARE_LOST:kotlin.Int),[android.telephony.mbms.MbmsErrors#ERROR_MIDDLEWARE_NOT_BOUND](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors#ERROR_MIDDLEWARE_NOT_BOUND:kotlin.Int),[android.telephony.mbms.MbmsErrors.InitializationErrors#ERROR_APP_PERMISSIONS_NOT_GRANTED](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.InitializationErrors#ERROR_APP_PERMISSIONS_NOT_GRANTED:kotlin.Int),[android.telephony.mbms.MbmsErrors.InitializationErrors#ERROR_DUPLICATE_INITIALIZE](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.InitializationErrors#ERROR_DUPLICATE_INITIALIZE:kotlin.Int),[android.telephony.mbms.MbmsErrors.InitializationErrors#ERROR_UNABLE_TO_INITIALIZE](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.InitializationErrors#ERROR_UNABLE_TO_INITIALIZE:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_MIDDLEWARE_NOT_YET_READY](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_MIDDLEWARE_NOT_YET_READY:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_OUT_OF_MEMORY](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_OUT_OF_MEMORY:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_MIDDLEWARE_TEMPORARILY_UNAVAILABLE](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_MIDDLEWARE_TEMPORARILY_UNAVAILABLE:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_IN_E911](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_IN_E911:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_NOT_CONNECTED_TO_HOME_CARRIER_LTE](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_NOT_CONNECTED_TO_HOME_CARRIER_LTE:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_UNABLE_TO_READ_SIM](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_UNABLE_TO_READ_SIM:kotlin.Int),[android.telephony.mbms.MbmsErrors.GeneralErrors#ERROR_CARRIER_CHANGE_NOT_ALLOWED](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_CARRIER_CHANGE_NOT_ALLOWED:kotlin.Int),[android.telephony.mbms.MbmsErrors.DownloadErrors#ERROR_CANNOT_CHANGE_TEMP_FILE_ROOT](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.DownloadErrors#ERROR_CANNOT_CHANGE_TEMP_FILE_ROOT:kotlin.Int),[android.telephony.mbms.MbmsErrors.DownloadErrors#ERROR_UNKNOWN_DOWNLOAD_REQUEST](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.DownloadErrors#ERROR_UNKNOWN_DOWNLOAD_REQUEST:kotlin.Int), or[android.telephony.mbms.MbmsErrors.DownloadErrors#ERROR_UNKNOWN_FILE_INFO](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.DownloadErrors#ERROR_UNKNOWN_FILE_INFO:kotlin.Int) |
| `message` | [String](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)!:A message, intended for debugging purposes, describing the error in further detail. |
### onFileServicesUpdated
Added in[API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onFileServicesUpdated(services: MutableList!): Unit
```
Called to indicate published File Services have changed. This will only be called after the application has requested a list of file services and specified a service class list of interest via[MbmsDownloadSession.requestUpdateFileServices(List)](https://developer.android.com/reference/kotlin/android/telephony/MbmsDownloadSession.html#requestUpdateFileServices(kotlin.collections.MutableList)). If there are subsequent calls to[MbmsDownloadSession.requestUpdateFileServices(List)](https://developer.android.com/reference/kotlin/android/telephony/MbmsDownloadSession.html#requestUpdateFileServices(kotlin.collections.MutableList)), this method may not be called again if the list of service classes would remain the same.
| Parameters ||
|------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `services` | [MutableList](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-mutable-list/index.html)\<[FileServiceInfo](https://developer.android.com/reference/kotlin/android/telephony/mbms/FileServiceInfo)!\>!:The most recently updated list of available file services. |
### onMiddlewareReady
Added in[API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)
```
open fun onMiddlewareReady(): Unit
```
Called to indicate that the middleware has been initialized and is ready. Before this method is called, calling any method on an instance of[MbmsDownloadSession](https://developer.android.com/reference/kotlin/android/telephony/MbmsDownloadSession.html#)will result in an[IllegalStateException](https://developer.android.com/reference/kotlin/java/lang/IllegalStateException.html#)being thrown or[onError(int,java.lang.String)](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsDownloadSessionCallback#onError(kotlin.Int,%20kotlin.String))being called with error code[MbmsErrors.GeneralErrors.ERROR_MIDDLEWARE_NOT_YET_READY](https://developer.android.com/reference/kotlin/android/telephony/mbms/MbmsErrors.GeneralErrors#ERROR_MIDDLEWARE_NOT_YET_READY:kotlin.Int)