⒈头文件：
#include <FMX.Platform.hpp>
#include <FMX.PhoneDialer.hpp>
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⒉私有变量：
_di_IFMXPhoneDialerService phoneDialerService;
bool serviceSupported;
⒊代码：
void __fastcall TForm1::MyOnCallStateChanged(const UnicodeString aCallID, const TCallState aCallState) {
****switch (aCallState) {
case TCallState::None:
Label1->Text = L"No calls 电话处于空闲状态 ， 正等待接入 ";
break;
case TCallState::Connected:
Label1->Text = L"Connected 有电话打入 ， 处于连接状态 ";
break;
case TCallState::Incoming:
Label1->Text = L"Incoming call 来电 ";
break;
case TCallState::Dialing:
Label1->Text = L"Dialing 电话在拨号状态 ";
break;
case TCallState::Disconnected:
Label1->Text = L"Disconnected 断开呼叫 ";
break;
}
}
void __fastcall TForm1::FormCreate(TObject *Sender)
{
serviceSupported = (TPlatformServices::Current->SupportsPlatformService(__uuidof(IFMXPhoneDialerService)) &&
(phoneDialerService = TPlatformServices::Current->GetPlatformService(__uuidof(IFMXPhoneDialerService))));
if (serviceSupported) {
phoneDialerService->OnCallStateChanged = MyOnCallStateChanged;
****}
}
