API切换概述

FA模型和Stage模型由于线程模型和进程模型的差异，部分接口仅在FA模型下才能使用，针对这部分接口在SDK的接口中有FAModelOnly的标记，用于提醒开发者这部分接口仅能在FA模型下使用。因此在切换到Stage模型时，需要将应用中用到的FAModelOnly接口替换成Stage模型下对应的接口。下面是startAbility的接口切换示例，全量接口列表请查看后续章节：

startAbility接口由FA模型切换到Stage模型的示例：

• FA模型示例

  import featureAbility from '@ohos.ability.featureAbility';
  import Want from '@ohos.app.ability.Want';
  import Logger from '../../utils/Logger';
  
  const TAG: string = 'PagePageAbilityFirst';
  
  @Entry
  @Component
  struct Index {
    
    build() {
      // ...
      Button() {
        // ...
      }
      .onClick(async () => {
        try {
          Logger.info(TAG, 'Begin to start ability');
          let want: Want = {
            bundleName: 'com.samples.famodelabilitydevelop',
            moduleName: 'entry',
            abilityName: 'com.samples.famodelabilitydevelop.PageAbilitySingleton'
          };
          await featureAbility.startAbility({ want: want });
          Logger.info(TAG, `Start ability succeed`);
        }
        catch (error) {
          Logger.error(TAG, 'Start ability failed with ' + error);
        }
      })
    }
  }
  
  

• Stage示例示例

  import Want from '@ohos.app.ability.Want';
  import common from '@ohos.app.ability.common';
  import { BusinessError } from '@ohos.base';
  
  @Entry
  @Component
  struct Index {
    private context = getContext(this) as common.UIAbilityContext;
  
    build() {
      // ...
      Button() {
        // ...
      }
      .onClick(() => {
        // context为Ability对象的成员，在非Ability对象内部调用需要
        // 将Context对象传递过去
        let wantInfo: Want = {
          bundleName: "com.example.myapplication",
          abilityName: "EntryAbility"
        };
        this.context.startAbility(wantInfo).then(() => {
          console.info('startAbility success.');
        }).catch((error: BusinessError) => {
          console.error('startAbility failed.');
        })
      })
    }
  }