How to launch Facebook app through Xamarin Android ?

here if facebook is not installed on your divice then it will redirect to web browser.

public void getFacebook(){

bool result=isAppInstalled("com.facebook.katana");

if(result)

{  

string v = FB_URL.Replace("https", "fb");  

var uri = Android.Net.Uri.Parse (v);

var intent = new Intent (Intent.ActionView, uri); 

StartActivity(intent);    

}

          else

{

StartActivity(new Intent(Intent.ActionView, Android.Net.Uri.Parse(FB_URL)));    

}

}

protected bool isAppInstalled(string packageName) 

{

Intent mIntent = PackageManager.GetLaunchIntentForPackage(packageName);

if (mIntent != null) 

{

return true;

}

else 

{

return false;

}

}