启动ServiceAbility

ServiceAbility的启动与其他Ability并无区别，应用开发者可以在PageAbility中通过featureAbility的startAbility接口拉起ServiceAbility，在ServiceAbility中通过particleAbility的startAbility接口拉起ServiceAbility。ServiceAbility的启动规则详见组件启动规则章节。

如下示例展示了在PageAbility中通过startAbility启动bundleName为"com.example.myapplication"，abilityName为"ServiceAbility"的ServiceAbility的方法。启动FA模型的ServiceAbility时，需要在abilityName前拼接bundleName字符串。

import featureAbility from '@ohos.ability.featureAbility'
import Want from '@ohos.app.ability.Want';
import promptAction from '@ohos.promptAction';
import hilog from '@ohos.hilog';

const LOG_DOMAIN: number = 0x0000;
const LOG_TAG: string = 'startServiceAbility';
const startServiceAbility = async () => {
  try {
    hilog.info(LOG_DOMAIN, LOG_TAG, 'Begin to start ability');
    let want: Want = {
      bundleName: 'com.samples.famodelabilitydevelop',
      abilityName: 'com.samples.famodelabilitydevelop.ServiceAbility'
    };
    await featureAbility.startAbility({ want });
    promptAction.showToast({
      message: 'start service success'
    });
    hilog.info(LOG_DOMAIN, LOG_TAG, 'Start ability succeed');
  } catch (error) {
    hilog.info(LOG_DOMAIN, LOG_TAG, 'Start ability failed with ' + error);
  }
}

执行上述代码后，Ability将通过startAbility()方法来启动ServiceAbility。

• 如果ServiceAbility尚未运行，则系统会先调用onStart()来初始化ServiceAbility，再回调Service的onCommand()方法来启动ServiceAbility。

• 如果ServiceAbility正在运行，则系统会直接回调ServiceAbility的onCommand()方法来启动ServiceAbility。