创建ServiceAbility。

通过DevEco Studio开发平台创建ServiceAbility时，DevEco Studio会默认生成onStart、onStop、onCommand方法，其他方法需要开发者自行实现，接口说明参见前述章节。开发者也可以添加其他Ability请求与ServiceAbility交互时的处理方法，示例如下：

import { Want } from '@kit.AbilityKit';
import { rpc } from '@kit.IPCKit';
import { hilog } from '@kit.PerformanceAnalysisKit';

const TAG: string = '[Sample_FAModelAbilityDevelop]';
const domain: number = 0xFF00;

class FirstServiceAbilityStub extends rpc.RemoteObject {
  constructor(des: Object) {
    if (typeof des === 'string') {
      super(des);
    } else {
      return;
    }
  }

  onRemoteMessageRequest(code: number, data: rpc.MessageSequence, reply: rpc.MessageSequence, option: rpc.MessageOption): boolean {
    hilog.info(domain, TAG, 'ServiceAbility onRemoteRequest called');
    if (code === 1) {
      let string = data.readString();
      hilog.info(domain, TAG, `ServiceAbility string=${string}`);
      let result = Array.from(string).sort().join('');
      hilog.info(domain, TAG, `ServiceAbility result=${result}`);
      reply.writeString(result);
    } else {
      hilog.info(domain, TAG, 'ServiceAbility unknown request code');
    }
    return true;
  }
}

class ServiceAbility {
  onStart(): void {
    hilog.info(domain, TAG, 'ServiceAbility onStart');
  }

  onStop(): void {
    hilog.info(domain, TAG, 'ServiceAbility onStop');
  }

  onCommand(want: Want, startId: number): void {
    hilog.info(domain, TAG, 'ServiceAbility onCommand');
  }

  onConnect(want: Want): rpc.RemoteObject {
    hilog.info(domain, TAG, 'ServiceAbility onConnect' + want);
    return new FirstServiceAbilityStub('test');
  }

  onDisconnect(want: Want): void {
    hilog.info(domain, TAG, 'ServiceAbility onDisconnect' + want);
  }
}

export default new ServiceAbility();

注册ServiceAbility。

ServiceAbility需要在应用配置文件config.json中进行注册，注册类型type需要设置为service。"visible"属性表示ServiceAbility是否可以被其他应用调用，true表示可以被其他应用调用，false表示不能被其他应用调用（仅应用内可以调用）。若ServiceAbility需要被其他应用调用，注册ServiceAbility时需要设置"visible"为true，同时需要设置支持关联启动。ServiceAbility的启动规则详见FA模型组件启动规则章节。
```
{
  // ...
  "module": {
    // ...
    "abilities": [
      // ...
      {
        "name": ".ServiceAbility",
        "srcLanguage": "ets",
        "srcPath": "ServiceAbility",
        "icon": "$media:icon",
        "description": "$string:ServiceAbility_desc",
        "type": "service",
        "visible": true
      },
      // ...
    ]
    // ...
  }
}
```

目录

创建ServiceAbility