``` tsx
interface IContactItem {
  contactName: string;
  mobile: string;
}

interface IGetSelectedContactResult {
  contactList: IContactItem[];
}

private getSelectedContact = () => {
  getSelectedContact().then(result => {
    this.setState({
      payload: JSON.stringify(result),
    });
  }).catch(err => {
    alert(JSON.stringify(err));
  });
}
```