@ohos.telephony.observer (Observer)

The observer module provides event subscription management functions. You can register or unregister an observer that listens for the following events: network status change, signal status change, call status change, cellular data connection status, uplink and downlink data flow status of cellular data services, and SIM status change.

NOTE

The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import observer from '@ohos.telephony.observer';

observer.on('networkStateChange')

on(type: 'networkStateChange', callback: Callback<NetworkState>): void;

Registers an observer for network status change events. This API uses an asynchronous callback to return the execution result.

Required permission: ohos.permission.GET_NETWORK_INFO

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Network status change event. This field has a fixed value of networkStateChange.
callback	Callback<NetworkState>	Yes	Callback used to return the result. For details, see NetworkState.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
201	Permission denied.
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

observer.on('networkStateChange', (data: observer.NetworkState) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
});

observer.on('networkStateChange')

on(type: 'networkStateChange', options: { slotId: number }, callback: Callback<NetworkState>): void;

Registers an observer for network status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the execution result.

Required permission: ohos.permission.GET_NETWORK_INFO

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Network status change event. This field has a fixed value of networkStateChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<NetworkState>	Yes	Callback used to return the result. For details, see NetworkState.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
201	Permission denied.
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('networkStateChange', id, (data: observer.NetworkState) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
});

observer.off('networkStateChange')

off(type: 'networkStateChange', callback?: Callback<NetworkState>): void;

Unregisters the observer for network status change events. This API uses an asynchronous callback to return the execution result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Network status change event. This field has a fixed value of networkStateChange.
callback	Callback<NetworkState>	No	Callback used to return the result. For details, see NetworkState.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

let callback: (data: observer.NetworkState) => void = (data: observer.NetworkState) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
}
observer.on('networkStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('networkStateChange', callback);
observer.off('networkStateChange');

observer.on('signalInfoChange')

on(type: 'signalInfoChange', callback: Callback<Array<SignalInformation>>): void;

Registers an observer for signal status change events. This API uses an asynchronous callback to return the execution result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Signal status change event. This field has a fixed value of signalInfoChange.
callback	Callback<Array<SignalInformation>>	Yes	Callback used to return the result. For details, see SignalInformation.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import radio from '@ohos.telephony.radio';

observer.on('signalInfoChange', (data: Array<radio.SignalInformation>) => {
    console.log("on signalInfoChange, data:" + JSON.stringify(data));
});

observer.on('signalInfoChange')

on(type: 'signalInfoChange', options: { slotId: number }, callback: Callback<Array<SignalInformation>>): void;

Registers an observer for signal status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the execution result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Signal status change event. This field has a fixed value of signalInfoChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<Array<SignalInformation>>	Yes	Callback used to return the result. For details, see SignalInformation.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import radio from '@ohos.telephony.radio';

class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('signalInfoChange', id, (data: Array<radio.SignalInformation>) => {
    console.log("on signalInfoChange, data:" + JSON.stringify(data));
});

observer.off('signalInfoChange')

off(type: 'signalInfoChange', callback?: Callback<Array<SignalInformation>>): void;

Unregisters the observer for signal status change events. This API uses an asynchronous callback to return the execution result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Signal status change event. This field has a fixed value of signalInfoChange.
callback	Callback<Array<SignalInformation>>	No	Callback used to return the result. For details, see SignalInformation.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import radio from '@ohos.telephony.radio';

let callback: (data: Array<radio.SignalInformation>) => void = (data: Array<radio.SignalInformation>) => {
    console.log("on signalInfoChange, data:" + JSON.stringify(data));
}
observer.on('signalInfoChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('signalInfoChange', callback);
observer.off('signalInfoChange');

observer.on('cellInfoChange')⁸⁺

on(type: 'cellInfoChange', callback: Callback<Array<CellInformation>>): void;

Registers an observer for cell information change events. This API uses an asynchronous callback to return the result.

System API: This is a system API.

Required permissions: ohos.permission.LOCATION and ohos.permission.APPROXIMATELY_LOCATION

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cell information change event. This field has a fixed value of cellInfoChange.
callback	Callback<Array<CellInformation>>	Yes	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications use system APIs.
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import radio from '@ohos.telephony.radio';

observer.on('cellInfoChange', (data: Array<radio.CellInformation>) => {
    console.log("on cellInfoChange, data:" + JSON.stringify(data));
});

observer.on('cellInfoChange')⁸⁺

on(type: 'cellInfoChange', options: { slotId: number }, callback: Callback<Array<CellInformation>>): void;

Registers an observer for signal status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the execution result.

System API: This is a system API.

Required permissions: ohos.permission.LOCATION and ohos.permission.APPROXIMATELY_LOCATION

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cell information change event. This field has a fixed value of cellInfoChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<Array<CellInformation>>	Yes	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
201	Permission denied.
202	Non-system applications use system APIs.
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import radio from '@ohos.telephony.radio';

class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('cellInfoChange', id, (data: Array<radio.CellInformation>) => {
    console.log("on cellInfoChange, data:" + JSON.stringify(data));
});

observer.off('cellInfoChange')⁸⁺

off(type: 'cellInfoChange', callback?: Callback<Array<CellInformation>>): void;

Unregisters the observer for cell information change events. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System API: This is a system API.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cell information change event. This field has a fixed value of cellInfoChange.
callback	Callback<Array<CellInformation>>	No	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
202	Non-system applications use system APIs.
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import radio from '@ohos.telephony.radio';

let callback: (data: Array<radio.CellInformation>) => void = (data: Array<radio.CellInformation>) => {
    console.log("on cellInfoChange, data:" + JSON.stringify(data));
}
observer.on('cellInfoChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('cellInfoChange', callback);
observer.off('cellInfoChange');

observer.on('callStateChange')

on(type: 'callStateChange', callback: Callback<{ state: CallState, number: string }>): void;

Registers an observer for call status change events. This API uses an asynchronous callback to return the execution result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Call status change event. This field has a fixed value of callStateChange.
callback	Callback<{ state: CallState, number: string }>	Yes	Callback function. For details, see CallState in call. number: phone number.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import call from '@ohos.telephony.call';

class Value {
    state: call.CallState = call.CallState.CALL_STATE_UNKNOWN
    number: string = ""
}
observer.on('callStateChange', (value: Value) => {
    console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
});

observer.on('callStateChange')

on(type: 'callStateChange', options: { slotId: number }, callback: Callback<{ state:CallState, number: string }>): void;

Registers an observer for call status change events. This API uses an asynchronous callback to return the execution result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Call status change event. This field has a fixed value of callStateChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<{ state: CallState, number: string }>	Yes	Callback function. For details, see CallState in call. number: phone number.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import call from '@ohos.telephony.call';

class Value {
    state: call.CallState = call.CallState.CALL_STATE_UNKNOWN
    number: string = ""
}
class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('callStateChange', id, (value: Value) => {
    console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
});

observer.off('callStateChange')

off(type: 'callStateChange', callback?: Callback<{ state: CallState, number: string }>): void;

Unregisters the observer for call status change events. This API uses an asynchronous callback to return the execution result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Call status change event. This field has a fixed value of callStateChange.
callback	Callback<{ state: CallState, number: string }>	No	Callback function. For details, see CallState in call. number: phone number.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import call from '@ohos.telephony.call';

class Value {
    state: call.CallState = call.CallState.CALL_STATE_UNKNOWN
    number: string = ""
}
let callback: (value: Value) => void = (value: Value) => {
    console.log("on callStateChange, state:" + value.state + ", number:" + value.number);
}
observer.on('callStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('callStateChange', callback);
observer.off('callStateChange');

observer.on('cellularDataConnectionStateChange')⁷⁺

on(type: 'cellularDataConnectionStateChange', callback: Callback<{ state: DataConnectState, network: RatType}>): void;

Registers an observer for connection status change events of the cellular data link. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data connection status event. This field has a fixed value of cellularDataConnectionStateChange.
callback	Callback<{ state: DataConnectState, network: RatType }>	Yes	Callback used to return the result. For details, see DataConnectState and RadioTechnology.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import data from '@ohos.telephony.data';
import radio from '@ohos.telephony.radio';

class Value {
    state: data.DataConnectState = data.DataConnectState.DATA_STATE_UNKNOWN
    network: radio.RadioTechnology = radio.RadioTechnology.RADIO_TECHNOLOGY_UNKNOWN
}
observer.on('cellularDataConnectionStateChange', (value: Value) => {
    console.log("on cellularDataConnectionStateChange, state:" + value.state + ", network:" + value.network);
});

observer.on('cellularDataConnectionStateChange')⁷⁺

on(type: 'cellularDataConnectionStateChange', options: { slotId: number }, callback: Callback<{ state: DataConnectState, network: RatType }>): void;

Registers an observer for connection status change events of the cellular data link over the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data connection status event. This field has a fixed value of cellularDataConnectionStateChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<{ state: DataConnectState, network: RatType }>	Yes	Callback used to return the result. For details, see DataConnectState and RadioTechnology.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import data from '@ohos.telephony.data';
import radio from '@ohos.telephony.radio';

class Value {
    state: data.DataConnectState = data.DataConnectState.DATA_STATE_UNKNOWN
    network: radio.RadioTechnology = radio.RadioTechnology.RADIO_TECHNOLOGY_UNKNOWN
}
class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('cellularDataConnectionStateChange', id, (value: Value) => {
    console.log("on cellularDataConnectionStateChange, state:" + value.state + ", network:" + value.network);
});

observer.off('cellularDataConnectionStateChange')⁷⁺

off(type: 'cellularDataConnectionStateChange', callback?: Callback<{ state: DataConnectState, network: RatType}>): void;

Unregisters the observer for connection status change events of the cellular data link. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data connection status event. This field has a fixed value of cellularDataConnectionStateChange.
callback	Callback<{ state: DataConnectState, network: RatType }>	No	Callback used to return the result. For details, see DataConnectState and RadioTechnology.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import data from '@ohos.telephony.data';
import radio from '@ohos.telephony.radio';

class Value {
    state: data.DataConnectState = data.DataConnectState.DATA_STATE_UNKNOWN
    network: radio.RadioTechnology = radio.RadioTechnology.RADIO_TECHNOLOGY_UNKNOWN
}
let callback: (value: Value) => void = (value: Value) => {
    console.log("on cellularDataConnectionStateChange, state:" + value.state + ", network:" + value.network);
}
observer.on('cellularDataConnectionStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('cellularDataConnectionStateChange', callback);
observer.off('cellularDataConnectionStateChange');

observer.on('cellularDataFlowChange')⁷⁺

on(type: 'cellularDataFlowChange', callback: Callback<DataFlowType>): void;

Registers an observer for the uplink and downlink data flow status change events of the cellular data service. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data flow change event. This field has a fixed value of cellularDataFlowChange.
callback	Callback<DataFlowType>	Yes	Callback used to return the result. For details, see DataFlowType.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import data from '@ohos.telephony.data';

observer.on('cellularDataFlowChange', (data: data.DataFlowType) => {
    console.log("on networkStateChange, data:" + JSON.stringify(data));
});

observer.on('cellularDataFlowChange')⁷⁺

on(type: 'cellularDataFlowChange', options: { slotId: number }, callback: Callback<DataFlowType>): void;

Registers an observer for the uplink and downlink data flow status change events of the cellular data service on the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data flow change event. This field has a fixed value of cellularDataFlowChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<DataFlowType>	Yes	Callback used to return the result. For details, see DataFlowType.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import data from '@ohos.telephony.data';

class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('cellularDataFlowChange', id, (data: data.DataFlowType) => {
    console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
});

observer.off('cellularDataFlowChange')⁷⁺

off(type: 'cellularDataFlowChange', callback?: Callback<DataFlowType>): void;

Unregisters the observer for the uplink and downlink data flow status change events of the cellular data service. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Cellular data flow change event. This field has a fixed value of cellularDataFlowChange.
callback	Callback<DataFlowType>	No	Callback used to return the result. For details, see DataFlowType.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

import data from '@ohos.telephony.data';

let callback: (data: data.DataFlowType) => void = (data: data.DataFlowType) => {
    console.log("on cellularDataFlowChange, data:" + JSON.stringify(data));
}
observer.on('cellularDataFlowChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('cellularDataFlowChange', callback);
observer.off('cellularDataFlowChange');

observer.on('simStateChange')⁷⁺

on(type: 'simStateChange', callback: Callback<SimStateData>): void;

Registers an observer for SIM card status change events. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	SIM status change event. This field has a fixed value of simStateChange.
callback	Callback<SimStateData>	Yes	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

observer.on('simStateChange', (data: observer.SimStateData) => {
    console.log("on simStateChange, data:" + JSON.stringify(data));
});

observer.on('simStateChange')⁷⁺

on(type: 'simStateChange', options: { slotId: number }, callback: Callback<SimStateData>): void;

Registers an observer for status change events of the SIM card in the specified slot. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	SIM status change event. This field has a fixed value of simStateChange.
slotId	number	Yes	Card slot ID. - 0: card slot 1 - 1: card slot 2
callback	Callback<SimStateData>	Yes	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

class SlotId {
    slotId: number = 0
}
let id: SlotId = {slotId: 0}
observer.on('simStateChange', id, (data: observer.SimStateData) => {
    console.log("on simStateChange, data:" + JSON.stringify(data));
});

observer.off('simStateChange')⁷⁺

off(type: 'simStateChange', callback?: Callback<SimStateData>): void;

Unregisters the observer for SIM card status change events. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	SIM status change event. This field has a fixed value of simStateChange.
callback	Callback<SimStateData>	No	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
401	Parameter error.
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

let callback: (data: observer.SimStateData) => void = (data: observer.SimStateData) => {
    console.log("on simStateChange, data:" + JSON.stringify(data));
}
observer.on('simStateChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('simStateChange', callback);
observer.off('simStateChange');

observer.on('iccAccountInfoChange')¹⁰⁺

on(type: 'iccAccountInfoChange', callback: Callback<void>): void;

Registers an observer for account information change events of the SIM card. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Account information change event. This field has a fixed value of iccAccountInfoChange.
callback	Callback<void>	Yes	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

observer.on('iccAccountInfoChange', () => {
    console.log("on iccAccountInfoChange success");
});

observer.off('iccAccountInfoChange')¹⁰⁺

off(type: 'iccAccountInfoChange', callback?: Callback<void>): void;

Unregisters the observer for account information change events of the SIM card. This API uses an asynchronous callback to return the result.

NOTE

You can pass the callback of the on function if you want to cancel listening for a certain type of event. If you do not pass the callback, you will cancel listening for all events.

System capability: SystemCapability.Telephony.StateRegistry

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Account information change event. This field has a fixed value of iccAccountInfoChange.
callback	Callback<void>	No	Callback used to return the result.

Error codes

For details about the following error codes, see Telephony Error Codes.

ID	Error Message
8300001	Invalid parameter value.
8300002	Operation failed. Cannot connect to service.
8300003	System internal error.
8300999	Unknown error code.

Example

let callback: () => void = () => {
    console.log("on iccAccountInfoChange success");
}
observer.on('iccAccountInfoChange', callback);
// You can pass the callback of the on method to cancel listening for a certain type of callback. If you do not pass the callback, you will cancel listening for all callbacks.
observer.off('iccAccountInfoChange', callback);
observer.off('iccAccountInfoChange');

LockReason⁸⁺

Enumerates SIM card lock types.

System capability: SystemCapability.Telephony.StateRegistry

Name	Value	Description
SIM_NONE	0	No lock.
SIM_PIN	1	PIN lock.
SIM_PUK	2	PUK lock.
SIM_PN_PIN	3	Network PIN lock.
SIM_PN_PUK	4	Network PUK lock.
SIM_PU_PIN	5	Subnet PIN lock.
SIM_PU_PUK	6	Subnet PUK lock.
SIM_PP_PIN	7	Service provider PIN lock.
SIM_PP_PUK	8	Service provider PUK lock.
SIM_PC_PIN	9	Organization PIN lock.
SIM_PC_PUK	10	Organization PUK lock.
SIM_SIM_PIN	11	SIM PIN lock.
SIM_SIM_PUK	12	SIM PUK lock.

SimStateData⁷⁺

Enumerates SIM card types and states.

System capability: SystemCapability.Telephony.StateRegistry

Name	Type	Mandatory	Description
type	CardType	Yes	SIM card type.
state	SimState	Yes	SIM card state.
reason⁸⁺	LockReason	Yes	SIM card lock type.

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harmony 鸿蒙@ohos.telephony.observer (Observer)

@ohos.telephony.observer (Observer)

Modules to Import

observer.on('networkStateChange')

observer.on('networkStateChange')

observer.off('networkStateChange')

observer.on('signalInfoChange')

observer.on('signalInfoChange')

observer.off('signalInfoChange')

observer.on('cellInfoChange')⁸⁺

observer.on('cellInfoChange')⁸⁺

observer.off('cellInfoChange')⁸⁺

observer.on('callStateChange')

observer.on('callStateChange')

observer.off('callStateChange')

observer.on('cellularDataConnectionStateChange')⁷⁺

observer.on('cellularDataConnectionStateChange')⁷⁺

observer.off('cellularDataConnectionStateChange')⁷⁺

observer.on('cellularDataFlowChange')⁷⁺

observer.on('cellularDataFlowChange')⁷⁺

observer.off('cellularDataFlowChange')⁷⁺

observer.on('simStateChange')⁷⁺

observer.on('simStateChange')⁷⁺

observer.off('simStateChange')⁷⁺

observer.on('iccAccountInfoChange')¹⁰⁺

observer.off('iccAccountInfoChange')¹⁰⁺

LockReason⁸⁺

SimStateData⁷⁺

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标签云

@ohos.telephony.observer (Observer)

Modules to Import

observer.on('networkStateChange')

observer.on('networkStateChange')

observer.off('networkStateChange')

observer.on('signalInfoChange')

observer.on('signalInfoChange')

observer.off('signalInfoChange')

observer.on('cellInfoChange')8+

observer.on('cellInfoChange')8+

observer.off('cellInfoChange')8+

observer.on('callStateChange')

observer.on('callStateChange')

observer.off('callStateChange')

observer.on('cellularDataConnectionStateChange')7+

observer.on('cellularDataConnectionStateChange')7+

observer.off('cellularDataConnectionStateChange')7+

observer.on('cellularDataFlowChange')7+

observer.on('cellularDataFlowChange')7+

observer.off('cellularDataFlowChange')7+

observer.on('simStateChange')7+

observer.on('simStateChange')7+

observer.off('simStateChange')7+

observer.on('iccAccountInfoChange')10+

observer.off('iccAccountInfoChange')10+

LockReason8+

SimStateData7+

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observer.on('cellInfoChange')⁸⁺

observer.on('cellInfoChange')⁸⁺

observer.off('cellInfoChange')⁸⁺

observer.on('cellularDataConnectionStateChange')⁷⁺

observer.on('cellularDataConnectionStateChange')⁷⁺

observer.off('cellularDataConnectionStateChange')⁷⁺

observer.on('cellularDataFlowChange')⁷⁺

observer.on('cellularDataFlowChange')⁷⁺

observer.off('cellularDataFlowChange')⁷⁺

observer.on('simStateChange')⁷⁺

observer.on('simStateChange')⁷⁺

observer.off('simStateChange')⁷⁺

observer.on('iccAccountInfoChange')¹⁰⁺

observer.off('iccAccountInfoChange')¹⁰⁺

LockReason⁸⁺

SimStateData⁷⁺