1# API Switching Overview 2 3 4Due to the differences in the thread model and process model, certain APIs can be used only in the FA model. They are marked with **FAModelOnly** in the SDK. When switching an application from the FA model to the stage model, replace the APIs marked with **FAModelOnly** in the application with the APIs supported in the stage model. This topic uses the switching of **startAbility()** as an example. 5 6 7 8 9 10- Sample code of **startAbility()** in the FA model: 11 12 ```ts 13 import featureAbility from '@ohos.ability.featureAbility'; 14 import Want from '@ohos.app.ability.Want'; 15 import hilog from '@ohos.hilog'; 16 17 const TAG: string = 'PagePageAbilityFirst'; 18 const domain: number = 0xFF00; 19 20 @Entry 21 @Component 22 struct PagePageAbilityFirst { 23 24 build() { 25 Column() { 26 List({ initialIndex: 0 }) { 27 ListItem() { 28 Flex({ justifyContent: FlexAlign.SpaceBetween, alignContent: FlexAlign.Center }) { 29 //... 30 } 31 .onClick(() => { 32 (async (): Promise<void> => { 33 try { 34 hilog.info(domain, TAG, 'Begin to start ability'); 35 let want: Want = { 36 bundleName: 'com.samples.famodelabilitydevelop', 37 moduleName: 'entry', 38 abilityName: 'com.samples.famodelabilitydevelop.PageAbilitySingleton' 39 }; 40 await featureAbility.startAbility({ want: want }); 41 hilog.info(domain, TAG, `Start ability succeed`); 42 } 43 catch (error) { 44 hilog.error(domain, TAG, 'Start ability failed with ' + error); 45 } 46 })() 47 }) 48 } 49 //... 50 } 51 //... 52 } 53 //... 54 } 55 } 56 57 ``` 58 59- Sample code of **startAbility()** in the stage model: 60 61 ```ts 62 import { hilog } from '@kit.PerformanceAnalysisKit'; 63 import { Want, common, Caller } from '@kit.AbilityKit'; 64 import { BusinessError } from '@kit.BasicServicesKit'; 65 66 const TAG: string = '[Page_UIAbilityComponentsInteractive]'; 67 const DOMAIN_NUMBER: number = 0xFF00; 68 69 @Entry 70 @Component 71 struct Page_UIAbilityComponentsInteractive { 72 private context = this.getUIContext().getHostContext() as common.UIAbilityContext; 73 caller: Caller | undefined = undefined; 74 build() { 75 Column() { 76 //... 77 List({ initialIndex: 0 }) { 78 ListItem() { 79 Row() { 80 //... 81 } 82 .onClick(() => { 83 // Context is a member of the ability object and is required for invoking inside a non-ability object. 84 // Pass in the Context object. 85 let wantInfo: Want = { 86 deviceId: '', // An empty deviceId indicates the local device. 87 bundleName: 'com.samples.stagemodelabilitydevelop', 88 moduleName: 'entry', // moduleName is optional. 89 abilityName: 'FuncAbilityA', 90 parameters: { // Custom information. 91 info: 'From the UIAbilityComponentsInteractive page of EntryAbility', 92 }, 93 }; 94 // context is the UIAbilityContext of the initiator UIAbility. 95 this.context.startAbility(wantInfo).then(() => { 96 hilog.info(DOMAIN_NUMBER, TAG, 'startAbility success.'); 97 }).catch((error: BusinessError) => { 98 hilog.error(DOMAIN_NUMBER, TAG, 'startAbility failed.'); 99 }); 100 }) 101 } 102 //... 103 } 104 //... 105 } 106 //... 107 } 108 } 109 ``` 110
