[Guide] Lock Screen-Orientation

Hey,
Today I tried to lock the Screen-Orientation of the App I'm currently developing. I wanted to lock the Orientation on Phones to Portrait and on Tablets it have to be Landscape.

Normally I would create Layouts for Landscape and Portrait mode for both Idioms, but in this case that is not the way to go.
Think of Angry-Birds in Portrait Mode on a Phone. Yeah that would be a crappy experience

So I worked on that and was finally able to do it.

Now here's what I've done:

On Android you have to set those flags in MainActivity.cs:

[Activity(Label = "YourAppName", Icon = "@drawable/Icon", Theme = "@style/StandardTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]

And in the OnCreate you write those lines before base.OnCreate(bundle);

switch(Device.Idiom)
{
    case TargetIdiom.Phone:
        RequestedOrientation = ScreenOrientation.Portrait;
        break;
    case TargetIdiom.Tablet:
        RequestedOrientation = ScreenOrientation.Landscape;
        break;
}

So I tested this on my Tablet and hell yeah it worked. I couldn't change the Orientation anymore.
But then I tested it on my Phone and hell no it didn't worked

I searched for a few hours for a solution why it won't work and tested a lot of stuff that I found here in the forums or on SO.
And then I stumbled upon this SO Thread: Stack Overflow.
Here was the problem. It was my Phone! I have an Samsung Galaxy Note 2.
So I searched on the internet what is going on and found out that different devices ignoring the RequestedOrientation flag

Then I remember that in MainActivity.cs you can override this:

public override void OnConfigurationChanged(Android.Content.Res.Configuration newConfig)

The Configuration in here has a Orientation property which will give you access to the current Orientation

Now I hooked it up and got this solution:

public override void OnConfigurationChanged(Android.Content.Res.Configuration newConfig)
{
    base.OnConfigurationChanged(newConfig);

    switch(newConfig.Orientation)
    {
        case Orientation.Landscape:
            switch(Device.Idiom)
            {
                case TargetIdiom.Phone:
                    LockRotation(Orientation.Portrait);
                    break;
                case TargetIdiom.Tablet:
                    LockRotation(Orientation.Landscape);
                    break;
            }
            break;
        case Orientation.Portrait:
            switch(Device.Idiom)
            {
                case TargetIdiom.Phone:
                    LockRotation(Orientation.Portrait);
                    break;
                case TargetIdiom.Tablet:
                    LockRotation(Orientation.Landscape);
                    break;
            }
            break;
    }
}

private void LockRotation(Orientation orientation)
{
    switch(orientation)
    {
        case Orientation.Portrait:
            RequestedOrientation = ScreenOrientation.Portrait;
            break;
        case Orientation.Landscape:
            RequestedOrientation = ScreenOrientation.Landscape;
            break;
    }
}

Now everything worked as it should. Now even on my Galaxy Note 2 it didn't changed the Orientation anymore.

For iOS it was really simple compared to Android Just put this in your AppDelegate.cs

public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations(UIApplication application, UIWindow forWindow)
{
    switch(Device.Idiom)
    {
        case TargetIdiom.Phone:
            return UIInterfaceOrientationMask.Portrait;
        case TargetIdiom.Tablet:
            return UIInterfaceOrientationMask.Landscape;
        default:
            return UIInterfaceOrientationMask.Portrait;
    }
}

I hope this helps someone who is struggling with the same thing