Making a phone call from your app

Many mobile devices, especially in the consumer market, are phones or devices that can make phone calls. In some cases, your mobile app may have the capability of making a call or just monitor incoming or outgoing calls.

Getting ready

In this recipe, we'll see how to make a call and how to monitor current calls as well. Also, in this case, the useful FireMonkey platform services framework comes in handy.

How to do it...

1. Create a new mobile app by navigating to File | New | Multi-Device Application Delphi.
2. Select the Header/Footer template and click on OK.
3. Drop the following components on the main form:
   • TEdit (edtPhoneNumber)
   • TButton (btnCall)
   • TListBox (lbCalls)
   • TListBox (lbInfo)
4. Arrange the components as shown in the following screenshot:
   

Figure 8.21: The form with all the controls arranged

5. Put in some labels to explain what the list boxes will contain, as shown in the preceding screenshot.
6. Now, create the FormCreate event handler and fill it in with this code:

procedure...