如何僅在Xamarin中檢測緊急呼叫？

Question

有沒有辦法檢測在通話嘗試時電話是否只能撥打緊急電話（使用Xamarin）？

Answer 1

這是平臺特定的東西。 Unfortunaelty我不知道這個插件，所以你必須在Xamarin中使用本地API。

在Android上它是TelephonyManager如下所示：https://stackoverflow.com/a/14355706/1489968這是Java的，但可以很容易地轉換爲C＃：

public class MainActivity : Activity 
{ 
    protected override void OnCreate(Bundle bundle) 
    { 
     base.OnCreate(bundle); 
     SetContentView(Resource.Layout.Main); 

     var telMng = (TelephonyManager) GetSystemService(TelephonyService); 
     var myPhoneStateListener = new MyPhoneStateListener(); 
     myPhoneStateListener.ServiceStateChanged += (s, e) => Console.WriteLine("State: {0}", e); 
     telMng.Listen(myPhoneStateListener, PhoneStateListenerFlags.ServiceState); 
    } 
} 

public class MyPhoneStateListener : PhoneStateListener 
{ 
    public event EventHandler<ServiceState> ServiceStateChanged; 
    public override void OnServiceStateChanged(ServiceState serviceState) 
    { 
     base.OnServiceStateChanged(serviceState); 
     ServiceStateChanged?.Invoke(this, serviceState); 
    } 
} 

Answer 2

在iOS上：不知道這些信息是可用的，從來沒有見過它通過暴露SDK ...（也許在這個問題中添加iOS標籤，或者詢問iOS only的問題，回答可能在ObjC/Swift中，但你可以翻譯它）

在Android上：您正在查找的信息包含在手機的ServiceState：

var callState = new ServiceState(); 
switch (callState.State) { 
case PhoneState.InService: 
    { 
     var uri = Android.Net.Uri.Parse ("tel:555-2368"); // Jim Rockford's number ;-) 
     var intent = new Intent (Intent.ActionDial, uri); 
     StartActivity (intent); 
     break; 
    } 
case PhoneState.EmergencyOnly: 
    { 
     Toast.MakeText (this, "Emergency Calls Only", ToastLength.Long).Show(); 
     break; 
    } 
case PhoneState.OutOfService: 
    { 
     Toast.MakeText (this, "Out of Service", ToastLength.Long).Show(); 
     break; 
    } 
case PhoneState.PowerOff: 
    { 
     Toast.MakeText (this, "Cell/Modem Power Off", ToastLength.Long).Show(); 
     break; 
    } 
default: 
    { 
     Toast.MakeText (this, "Should never be shown on a real device", ToastLength.Long).Show(); 
     break; 
    } 
} 

編號：http://developer.android.com/reference/android/telephony/ServiceState.html

有關模擬器進行測試，您可以通過adb殼設置狀態來denied：

voice denied 
data denied 

編號：https://developer.android.com/tools/devices/emulator.html