Target 4.0+

Activity1.cs

using Android.App;
using Android.OS;

namespace Notepad
{
	[Activity (Label = "Notepad", MainLauncher = true, Theme="@android:style/Theme.Holo.Light")]
	public class MainActivity : MvxActivity
	{
		int count = 1;

		protected override void OnCreate (Bundle bundle)
		{
			base.OnCreate (bundle);

			// Set our view from the "main" layout resource
			SetContentView (Resource.Layout.Main);
		
		}
	}
}

Notepad.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding="8dp"
    android:background="#ffe4e4e4">
    <TextView
        android:text="Filename"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textView1"
        style="@android:style/TextAppearance.Medium"  />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textFilename"
        local:MvxBind="Text Filename" />
    <TextView
        android:text="Contents"
        android:textAppearance="?android:attr/textAppearanceSmall"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textView3"
        style="@android:style/TextAppearance.Medium"
        android:layout_marginTop="8dp" />
    <EditText
        android:inputType="textMultiLine"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/textContents"
        local:MvxBind="Text Contents"
        android:height="0dp"
        android:layout_weight="1" />
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/linearLayout1">
        <Button
            android:text="Save"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:id="@+id/SaveButton" />
        <Button
            android:text="Load"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:id="@+id/LoadButton" />
    </LinearLayout>
</LinearLayout>