# TelephonyCallback.DataConnectionStateListener Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) # DataConnectionStateListener *** ** * ** *** Kotlin\|[Java](https://developer.android.com/reference/android/telephony/TelephonyCallback.DataConnectionStateListener "View this page in Java") ``` interface DataConnectionStateListener ``` |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | [android.telephony.TelephonyCallback.DataConnectionStateListener](https://developer.android.com/reference/kotlin/android/telephony/TelephonyCallback.DataConnectionStateListener#) | Interface for data connection state listener. ## Summary | Public methods || |--------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onDataConnectionStateChanged](https://developer.android.com/reference/kotlin/android/telephony/TelephonyCallback.DataConnectionStateListener#onDataConnectionStateChanged(kotlin.Int,%20kotlin.Int))`(`state:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, `networkType:` `[Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`)` Callback invoked when connection state changes on the registered subscription. | ## Public methods ### onDataConnectionStateChanged Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels) ``` abstract fun onDataConnectionStateChanged(     state: Int,     networkType: Int ): Unit ``` Callback invoked when connection state changes on the registered subscription. Note, the registration subscription ID comes from[TelephonyManager](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager)object which registers TelephonyCallback by[TelephonyManager.registerTelephonyCallback(Executor, TelephonyCallback)](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#registerTelephonyCallback(java.util.concurrent.Executor,%20android.telephony.TelephonyCallback)). If this TelephonyManager object was created with[TelephonyManager.createForSubscriptionId(int)](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#createForSubscriptionId(kotlin.Int)), then the callback applies to the subscription ID. Otherwise, this callback applies to[SubscriptionManager.getDefaultSubscriptionId()](https://developer.android.com/reference/kotlin/android/telephony/SubscriptionManager#getDefaultSubscriptionId()). | Parameters || |---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `state` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):is the current state of data connection. Value is[android.telephony.TelephonyManager#DATA_UNKNOWN](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_UNKNOWN:kotlin.Int),[android.telephony.TelephonyManager#DATA_DISCONNECTED](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_DISCONNECTED:kotlin.Int),[android.telephony.TelephonyManager#DATA_CONNECTING](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_CONNECTING:kotlin.Int),[android.telephony.TelephonyManager#DATA_CONNECTED](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_CONNECTED:kotlin.Int),[android.telephony.TelephonyManager#DATA_SUSPENDED](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_SUSPENDED:kotlin.Int),[android.telephony.TelephonyManager#DATA_DISCONNECTING](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_DISCONNECTING:kotlin.Int), or[android.telephony.TelephonyManager#DATA_HANDOVER_IN_PROGRESS](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_HANDOVER_IN_PROGRESS:kotlin.Int) | | `networkType` | [Int](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html):is the current network type of data connection. Value is[android.telephony.TelephonyManager#NETWORK_TYPE_UNKNOWN](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_UNKNOWN:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_GPRS](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_GPRS:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_EDGE](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_EDGE:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_UMTS](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_UMTS:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_CDMA](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_CDMA:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_EVDO_0](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_EVDO_0:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_EVDO_A](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_EVDO_A:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_1xRTT](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_1xRTT:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_HSDPA](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_HSDPA:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_HSUPA](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_HSUPA:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_HSPA](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_HSPA:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_IDEN](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_IDEN:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_EVDO_B](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_EVDO_B:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_LTE](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_LTE:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_EHRPD](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_EHRPD:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_HSPAP](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_HSPAP:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_GSM](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_GSM:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_TD_SCDMA](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_TD_SCDMA:kotlin.Int),[android.telephony.TelephonyManager#NETWORK_TYPE_IWLAN](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_IWLAN:kotlin.Int), or[android.telephony.TelephonyManager#NETWORK_TYPE_NR](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#NETWORK_TYPE_NR:kotlin.Int) | **See Also** - [android.telephony.TelephonyManager#DATA_DISCONNECTED](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_DISCONNECTED:kotlin.Int) - [android.telephony.TelephonyManager#DATA_CONNECTING](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_CONNECTING:kotlin.Int) - [android.telephony.TelephonyManager#DATA_CONNECTED](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_CONNECTED:kotlin.Int) - [android.telephony.TelephonyManager#DATA_SUSPENDED](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_SUSPENDED:kotlin.Int) - [android.telephony.TelephonyManager#DATA_HANDOVER_IN_PROGRESS](https://developer.android.com/reference/kotlin/android/telephony/TelephonyManager#DATA_HANDOVER_IN_PROGRESS:kotlin.Int)