如何判断是否安装某App？或者可正常换起某App？

import { BusinessError } from '@ohos.base'; 
import { common, Want } from '@kit.AbilityKit'; 
 
@Entry 
@Component 
struct Page43 { 
  build() { 
    Column() { 
      Button('跳转到地图').onClick(() => { 
        let want: Want = { 
          bundleName: 'com.amap.hmapp', 
          abilityName: 'EntryAbility' 
        }; 
        (getContext(this) as common.UIAbilityContext).startAbility(want).then(() => { 
          console.info('Start settings ability successfully.'); 
        }).catch((err: BusinessError) => { 
          console.error(`Failed to startAbility. Code: ${err.code}, message: ${err.message}`); 
        }); 
      }) 
    } 
    .width('100%') 
    .height('100%') 
  } 
}