Xamarin.Meetup – “Fluxing” Up Your Apps With Alex Dunn

Join us at the Microsoft NERD Center in Cambridge for the September Boston Mobile C# User-group on September 20th!

I’ll personally be speaking about implementing the Flux design pattern in your Xamarin and other .NET applications.

https://www.meetup.com/bostonmobiledev/events/242742363/

Meeting Details

Flux is the design pattern created by Facebook in your .NET apps to build robust and manageable data-driven interfaces. Learn what Flux is, how it differs from other patterns such as MVVM and MVC, and follow along and build your first app with Flux.

About the Presenter

Alex Dunn is a software consultant and architect with a passion for mobile application development and edge technology such as machine learning, AI, IoT, and modern web. He’s a Xamarin MVP and a Microsoft MVP for .NET, and can be found giving Guest Lectures at Xamarin University or organizing Boston’s Mobile C# User-group. Follow Alex and learn how to build beautiful and robust applications.

Twitter: @Suave_Pirate
GitHub: @SuavePirate
Blog: https://alexdunn.org
Flux Resources:

Source code for demo: https://github.com/suavepirate/xamarin.flux
Xamarin University Lecture:
https://university.xamarin.com/guestlectures/architecting-your-app-with-xamarin-facebook-flux
Gone Mobile Podcast:
http://gonemobile.io/blog/e0044.fluxing.up.your.xamarin.apps.with.alex.dunn/

 

If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.

Advertisements

Xamarin.University – Guest Lecture Available for Free!

Xamarin University has now published my second guest lecture on WebRTC and building cross-platform voice/video conferencing apps for free! Check it out here:

 

 

And as always, find the source code on my GitHub here: https://github.com/SuavePirate/Xamarin.WebRTC

 
If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.

Xamarin.Tip – Playing Audio Through the Earpiece on Android

Xamarin provides plenty of documentation on how to play audio in Android:

However, this never touches on directing audio through the onboard earpiece for applications such as voicemail or other real-time uses. Here’s a quick and dirty service that can be used in Xamarin.Android to direct audio through either the speaker or the onboard earpiece:

AudioService.cs

    public class AudioService : IAudioService
    {
        public AudioService()
        {
        }

        public void PlaySoundThroughEarPiece()
        {
            var mediaPlayer = new MediaPlayer();

            mediaPlayer.Reset();

            var audioManager = (AudioManager)Android.App.Application.Context.GetSystemService(Context.AudioService);
            mediaPlayer.SetAudioStreamType(Stream.VoiceCall);
            audioManager.Mode = Mode.InCall;
            audioManager.SpeakerphoneOn = false;
            mediaPlayer.SetDataSource(Android.App.Application.Context, Android.Net.Uri.Parse("android.resource://com.suavepirate.audiotest/raw/sample_sound"));
            mediaPlayer.Prepare();
            mediaPlayer.Start();
        }

        public void PlaySoundThroughSpeaker()
        {
            var mediaPlayer = MediaPlayer.Create(Android.App.Application.Context, Resource.Raw.sample_sound);


            var audioManager = (AudioManager)Android.App.Application.Context.GetSystemService(Context.AudioService);
            mediaPlayer.SetAudioStreamType(Stream.Music);
            audioManager.Mode = Mode.Normal;
            audioManager.SpeakerphoneOn = true;

            mediaPlayer.Start();
        }
    }

There are 2 important pieces required to stream it through the earpiece. Certain devices and Android versions only require 1 of the 2, but using both seems to be the best bet.

The first is to use the AudioManager service from the current Context and set SpeakerphoneOn to false as well as set the Mode to Mode.InCall. The second is to take the MediaPlayer object created and set the AudioStreamType to Stream.VoiceCall.

To go back to playing through the full speaker, revert the audio manager Mode to Normal, and set SpeakerphoneOn back to true. Be sure to also set the MediaPlayer.SetAudioStreamType with Stream.Music.

Check out an example of this on my GitHub here in Xamarin.Forms: https://github.com/SuavePirate/XamarinEarpieceAudioTest

If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.

Xamarin.Tip – Borderless Inputs

I published multiple posts this week about creating Xamarin.Forms controls without borders using Custom renderers. This post is your one stop shop for all these posts. These are the controls that are used in my repository to create Material Design inputs in Xamarin.Forms that you can find here:
https://github.com/SuavePirate/SuaveControls.MaterialFormControls. These will be talked about in posts to come!
Check the borderless controls out here:

  1. Xamarin.Forms Borderless Entry
  2. Xamarin.Forms Borderless Picker
  3. Xamarin.Forms Borderless DatePicker
  4. Xamarin.Forms Borderless TimePicker
  5. Xamarin.Forms Borderless Editor

And check out how they look here:

BorderlessEntry


BorderlessEditor

BorderlessPicker

BorderlessDatePicker

BorderlessTimePicker

If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.

Xamarin.Tip – Borderless Editor

I previously put out a post on removing the border of a Xamarin.Forms Entry which was then used to create a custom PinView as well as a MaterialEntry that follows the material design standards for text fields. Check those out here:

In this post, we’ll apply some of the same principles to create a BorderlessEditor. It’s going to use a simple custom renderer, although this could and should be done using an Effect if being used on its own. However, this BorderlessEditor will be the foundation for future controls.

You can find this code as part of my library in progress to create Material Design Form controls for Xamarin.Forms – https://github.com/SuavePirate/SuaveControls.MaterialFormControls.

Let’s get started with our custom control by first creating a custom subclass of Xamarin.Forms.Editor followed by a custom renderer class for iOS, Android, and UWP that kills the border.

BorderlessEditor.cs

namespace SuaveControls.MaterialForms
{
    public class BorderlessEditor : Editor
    {
    }
}

Nothing special here since we are using the default behavior of the Editor.

Android

Now let’s create an Android custom renderer.

BorderlessEditorRenderer.cs – Android

[assembly: ExportRenderer(typeof(BorderlessEditor), typeof(BorderlessEditorRenderer))]
namespace SuaveControls.MaterialForms.Android.Renderers
{
    public class BorderlessEditorRenderer : EditorRenderer
    {
        public static void Init() { }
        protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
        {
            base.OnElementChanged(e);
            if (e.OldElement == null)
            {
                Control.Background = null;

                var layoutParams = new MarginLayoutParams(Control.LayoutParameters);
                layoutParams.SetMargins(0, 0, 0, 0);
                LayoutParameters = layoutParams;
                Control.LayoutParameters = layoutParams;
                Control.SetPadding(0, 0, 0, 0);
                SetPadding(0, 0, 0, 0);
            }
        }
    }
}

We simple kill the default padding and margins while setting the Background property to null. This Background is what creates the drawable underline for the AppCompat Editor.

iOS

Follow with an iOS renderer.

BorderlessEditorRenderer.cs – iOS

[assembly: ExportRenderer(typeof(BorderlessEditor), typeof(BorderlessEditorRenderer))]
namespace SuaveControls.MaterialForms.iOS.Renderers
{
    public class BorderlessEditorRenderer : EditorRenderer
    {
        public static void Init() { }
        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            Control.Layer.BorderWidth = 0;
        }
    }
}

All we do here is set the BorderWidth to 0.

UWP

Lastly a renderer for UWP

BorderlessEditorRenderer.cs – UWP


[assembly: ExportRenderer(typeof(BorderlessEditor), typeof(BorderlessEditorRenderer))]

namespace SuaveControls.MaterialForms.UWP.Renderers
{
    public class BorderlessEditorRenderer : EditorRenderer
    {
        public static void Init() { }
        protected override void OnElementChanged(ElementChangedEventArgs<Editor> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.BorderThickness = new Windows.UI.Xaml.Thickness(0);
                Control.Margin = new Windows.UI.Xaml.Thickness(0);
                Control.Padding = new Windows.UI.Xaml.Thickness(0);
            }
        }
    }
}

Similar to how we did it on Android, we set both the Margin and Padding to 0 and also set the BorderThickness to a 0’d Thickness.

Using the BorderlessEditor

Now you can use the BorderlessEditor in your XAML or C# code:

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:ExampleMaterialApp"
             xmlns:suave="clr-namespace:SuaveControls.MaterialForms;assembly=SuaveControls.MaterialForms"
             x:Class="ExampleMaterialApp.MainPage">

    <ScrollView>
        <StackLayout Spacing="16" Margin="16" BackgroundColor="Blue">
            <Label Text="Borderless Editor!" Margin="32" HorizontalOptions="Center" HorizontalTextAlignment="Center"/>
            <suave:BorderlessEditor BackgroundColor="Black" TextColor="White" HeightRequest="300" Margin="32"/>

        </StackLayout>
    </ScrollView>

</ContentPage>

Check out those results on iOS:

If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.

Xamarin.Tip – Borderless TimePicker

I previously put out a post on removing the border of a Xamarin.Forms Entry which was then used to create a custom PinView as well as a MaterialEntry that follows the material design standards for text fields. I also added a post just like this one that talks about creating a BorderlessPicker. Check those out here:

In this post, we’ll do exactly what we did with the BorderlessPicker, but apply it to the Xamarin.Forms.TimePicker control to remove the border. This would ideally be done using an Effect, however we will be using this control in a later post to create a MaterialTimePicker to fit the Material Design standards for form inputs, so we will create custom renderers for Android, iOS, and UWP.

You can find this code as part of my library in progress to create Material Design Form controls for Xamarin.Forms – https://github.com/SuavePirate/SuaveControls.MaterialFormControls.

Let’s get started with our custom control by first creating a custom subclass of Xamarin.Forms.TimePicker followed by a custom renderer class for iOS, Android, and UWP that kills the border.

BorderlessTimePicker.cs

namespace SuaveControls.MaterialForms
{
    public class BorderlessTimePicker : TimePicker
    {
    }
}

Nothing special here since we are using the default behavior of the TimePicker.

Android

Now let’s create an Android custom renderer.

BorderlessTimePickerRenderer.cs – Android

[assembly: ExportRenderer(typeof(BorderlessTimePicker), typeof(BorderlessTimePickerRenderer))]
namespace SuaveControls.MaterialForms.Android.Renderers
{
    public class BorderlessTimePickerRenderer : TimePickerRenderer
    {
        public static void Init() { }
        protected override void OnElementChanged(ElementChangedEventArgs<TimePicker> e)
        {
            base.OnElementChanged(e);
            if (e.OldElement == null)
            {
                Control.Background = null;

                var layoutParams = new MarginLayoutParams(Control.LayoutParameters);
                layoutParams.SetMargins(0, 0, 0, 0);
                LayoutParameters = layoutParams;
                Control.LayoutParameters = layoutParams;
                Control.SetPadding(0, 0, 0, 0);
                SetPadding(0, 0, 0, 0);
            }
        }
    }
}

We simple kill the default padding and margins while setting the Background property to null. This Background is what creates the drawable underline for the AppCompat TimePicker.

iOS

Follow with an iOS renderer.

BorderlessTimePickerRenderer.cs – iOS

[assembly: ExportRenderer(typeof(BorderlessTimePicker), typeof(BorderlessTimePickerRenderer))]
namespace SuaveControls.MaterialForms.iOS.Renderers
{
    public class BorderlessTimePickerRenderer : TimePickerRenderer
    {
        public static void Init() { }
        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            Control.Layer.BorderWidth = 0;
            Control.BorderStyle = UITextBorderStyle.None;
        }
    }
}

All we do here is set the BorderWidth to 0 and the BorderStyle to UITextBorderStyle.None.

UWP

Lastly a renderer for UWP

BorderlessTimePickerRenderer.cs – UWP


[assembly: ExportRenderer(typeof(BorderlessTimePicker), typeof(BorderlessTimePickerRenderer))]

namespace SuaveControls.MaterialForms.UWP.Renderers
{
    public class BorderlessTimePickerRenderer : TimePickerRenderer
    {
        public static void Init() { }
        protected override void OnElementChanged(ElementChangedEventArgs<TimePicker> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.BorderThickness = new Windows.UI.Xaml.Thickness(0);
                Control.Margin = new Windows.UI.Xaml.Thickness(0);
                Control.Padding = new Windows.UI.Xaml.Thickness(0);
            }
        }
    }
}

Similar to how we did it on Android, we set both the Margin and Padding to 0 and also set the BorderThickness to a 0’d Thickness.

Using the BorderlessTimePicker

Now you can use the BorderlessTimePicker in your XAML or C# code:

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:ExampleMaterialApp"
             xmlns:suave="clr-namespace:SuaveControls.MaterialForms;assembly=SuaveControls.MaterialForms"
             x:Class="ExampleMaterialApp.MainPage">

    <ScrollView>
        <StackLayout Spacing="16" Margin="16">
            <Label Text="Borderless TimePicker!" Margin="32" HorizontalOptions="Center" HorizontalTextAlignment="Center"/>
            <suave:BorderlessTimePicker/>

        </StackLayout>
    </ScrollView>

</ContentPage>

Check out those results on iOS:

If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.

Xamarin.Tip – Borderless DatePicker

I previously put out a post on removing the border of a Xamarin.Forms Entry which was then used to create a custom PinView as well as a MaterialEntry that follows the material design standards for text fields. I also added a post just like this one that talks about creating a BorderlessPicker. Check those out here:

In this post, we’ll do exactly what we did with the BorderlessPicker, but apply it to the Xamarin.Forms.DatePicker control to remove the border. This would ideally be done using an Effect, however we will be using this control in a later post to create a MaterialDatePicker to fit the Material Design standards for form inputs, so we will create custom renderers for Android, iOS, and UWP.

You can find this code as part of my library in progress to create Material Design Form controls for Xamarin.Forms – https://github.com/SuavePirate/SuaveControls.MaterialFormControls.

Let’s get started with our custom control by first creating a custom subclass of Xamarin.Forms.DatePicker followed by a custom renderer class for iOS, Android, and UWP that kills the border.

BorderlessDatePicker.cs

namespace SuaveControls.MaterialForms
{
    public class BorderlessDatePicker : DatePicker
    {
    }
}

Nothing special here since we are using the default behavior of the DatePicker.

Android

Now let’s create an Android custom renderer.

BorderlessDatePickerRenderer.cs – Android

[assembly: ExportRenderer(typeof(BorderlessDatePicker), typeof(BorderlessDatePickerRenderer))]
namespace SuaveControls.MaterialForms.Android.Renderers
{
    public class BorderlessDatePickerRenderer : DatePickerRenderer
    {
        public static void Init() { }
        protected override void OnElementChanged(ElementChangedEventArgs<DatePicker> e)
        {
            base.OnElementChanged(e);
            if (e.OldElement == null)
            {
                Control.Background = null;

                var layoutParams = new MarginLayoutParams(Control.LayoutParameters);
                layoutParams.SetMargins(0, 0, 0, 0);
                LayoutParameters = layoutParams;
                Control.LayoutParameters = layoutParams;
                Control.SetPadding(0, 0, 0, 0);
                SetPadding(0, 0, 0, 0);
            }
        }
    }
}

We simple kill the default padding and margins while setting the Background property to null. This Background is what creates the drawable underline for the AppCompat DatePicker.

iOS

Follow with an iOS renderer.

BorderlessDatePickerRenderer.cs – iOS

[assembly: ExportRenderer(typeof(BorderlessDatePicker), typeof(BorderlessDatePickerRenderer))]
namespace SuaveControls.MaterialForms.iOS.Renderers
{
    public class BorderlessDatePickerRenderer : DatePickerRenderer
    {
        public static void Init() { }
        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            base.OnElementPropertyChanged(sender, e);

            Control.Layer.BorderWidth = 0;
            Control.BorderStyle = UITextBorderStyle.None;
        }
    }
}

All we do here is set the BorderWidth to 0 and the BorderStyle to UITextBorderStyle.None.

UWP

Lastly a renderer for UWP

BorderlessDatePickerRenderer.cs – UWP


[assembly: ExportRenderer(typeof(BorderlessDatePicker), typeof(BorderlessDatePickerRenderer))]

namespace SuaveControls.MaterialForms.UWP.Renderers
{
    public class BorderlessDatePickerRenderer : DatePickerRenderer
    {
        public static void Init() { }
        protected override void OnElementChanged(ElementChangedEventArgs<DatePicker> e)
        {
            base.OnElementChanged(e);

            if (Control != null)
            {
                Control.BorderThickness = new Windows.UI.Xaml.Thickness(0);
                Control.Margin = new Windows.UI.Xaml.Thickness(0);
                Control.Padding = new Windows.UI.Xaml.Thickness(0);
            }
        }
    }
}

Similar to how we did it on Android, we set both the Margin and Padding to 0 and also set the BorderThickness to a 0’d Thickness.

Using the BorderlessDatePicker

Now you can use the BorderlessDatePicker in your XAML or C# code:

MainPage.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:ExampleMaterialApp"
             xmlns:suave="clr-namespace:SuaveControls.MaterialForms;assembly=SuaveControls.MaterialForms"
             x:Class="ExampleMaterialApp.MainPage">

    <ScrollView>
        <StackLayout Spacing="16" Margin="16">
            <Label Text="Borderless DatePicker!" Margin="32" HorizontalOptions="Center" HorizontalTextAlignment="Center"/>
            <suave:BorderlessDatePicker/>

        </StackLayout>
    </ScrollView>

</ContentPage>

Check out those results on iOS:

If you like what you see, don’t forget to follow me on twitter @Suave_Pirate, check out my GitHub, and subscribe to my blog to learn more mobile developer tips and tricks!

Interested in sponsoring developer content? Message @Suave_Pirate on twitter for details.