harmony(鸿蒙)ServiceExtensionAbility

2022-08-09
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ServiceExtensionAbility

The ServiceExtensionAbility module provides APIs for Service Extension abilities.

NOTE

The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version. The APIs of this module can be used only in the stage model.

Modules to Import

import ServiceExtension from '@ohos.application.ServiceExtensionAbility';

Required Permissions

None.

Attributes

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Name	Type	Readable	Writable	Description
context	ServiceExtensionContext	Yes	No	Service Extension context, which is inherited from ExtensionContext.

ServiceExtensionAbility.onCreate

onCreate(want: Want): void;

Called when a Service Extension ability is created to initialize the service logic.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Information related to this Service Extension ability, including the ability name and bundle name.

Example

  class ServiceExt extends ServiceExtension {
    onCreate(want) {
      console.log('onCreate, want:' + want.abilityName);
    }
  }

ServiceExtensionAbility.onDestroy

onDestroy(): void;

Called when this Service Extension ability is destroyed to clear resources.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Example

  class ServiceExt extends ServiceExtension {
    onDestroy() {
      console.log('onDestroy');
    }
  }

ServiceExtensionAbility.onRequest

onRequest(want: Want, startId: number): void;

Called after onCreate is invoked when a Service Extension ability is started by calling startAbility. The value of startId is incremented for each ability that is started.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Information related to this Service Extension ability, including the ability name and bundle name.
startId	number	Yes	Number of ability start times. The initial value is 1, and the value is automatically incremented for each ability started.

Example

  class ServiceExt extends ServiceExtension {
    onRequest(want, startId) {
      console.log('onRequest, want:' + want.abilityName);
    }
  }

ServiceExtensionAbility.onConnect

onConnect(want: Want): rpc.RemoteObject;

Called after onCreate is invoked when a Service Extension ability is started by calling connectAbility. A RemoteObject object is returned for communication with the client.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Information related to this Service Extension ability, including the ability name and bundle name.

Return value

Type	Description
rpc.RemoteObject	A RemoteObject object used for communication with the client.

Example

  import rpc from '@ohos.rpc'
  class StubTest extends rpc.RemoteObject{
      constructor(des) {
          super(des);
      }
      onConnect(code, data, reply, option) {
      }
  }
  class ServiceExt extends ServiceExtension {
    onConnect(want) {
      console.log('onConnect , want:' + want.abilityName);
      return new StubTest("test");
    }
  }

ServiceExtensionAbility.onDisconnect

onDisconnect(want: Want): void;

Called when this Service Extension ability is disconnected.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Information related to this Service Extension ability, including the ability name and bundle name.

Example

  class ServiceExt extends ServiceExtension {
    onDisconnect(want) {
      console.log('onDisconnect, want:' + want.abilityName);
    }
  }

ServiceExtensionAbility.onReconnect

onReconnect(want: Want): void;

Called when this Service Extension ability is reconnected.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
want	Want	Yes	Information related to this Service Extension ability, including the ability name and bundle name.

Example

  class ServiceExt extends ServiceExtension {
    onReconnect(want) {
      console.log('onReconnect, want:' + want.abilityName);
    }
  }

ServiceExtensionAbility.onConfigurationUpdated

onConfigurationUpdated(config: Configuration): void;

Called when the configuration of this Service Extension ability is updated.

System capability: SystemCapability.Ability.AbilityRuntime.Core

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
config	Configuration	Yes	New configuration.

Example

  class ServiceExt extends ServiceExtension {
      onConfigurationUpdated(config) {
          console.log('onConfigurationUpdated, config:' + JSON.stringify(config));
      }
  }

ServiceExtensionAbility.dump

dump(params: Array<string>): Array<string>;

Dumps the client information.

System capability: SystemCapability.Ability.AbilityRuntime.AbilityCore

System API: This is a system API and cannot be called by third-party applications.

Parameters

Name	Type	Mandatory	Description
params	Array<string>	Yes	Parameters in the form of a command.

Example

  class ServiceExt extends ServiceExtension {
      dump(params) {
          console.log('dump, params:' + JSON.stringify(params));
          return ["params"]
      }
  }