Make a Simple Android App – Xamarin Android Tutorial

This post contains all the code that’s been written in this YouTube video.

Main.axml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:text="0"
        android:textSize="50sp"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/txtNumber"
        android:layout_marginBottom="20dp"
        android:layout_marginTop="20dp" />
    <Button
        android:text="Increment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnIncrement" />
    <Button
        android:text="Decrement"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btnDecrement" />
</LinearLayout>

MainActivity.cs

using Android.App;
using Android.Widget;
using Android.OS;

namespace XamarinTut
{
    [Activity(Label = "XamarinTut", MainLauncher = true, Icon = "@drawable/icon")]
    public class MainActivity : Activity
    {
        TextView txtNumber;

        int number;

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

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

            txtNumber = FindViewById<TextView>(Resource.Id.txtNumber);

            FindViewById<Button>(Resource.Id.btnIncrement).Click += (o, e) =>
            txtNumber.Text = (++number).ToString();

            FindViewById<Button>(Resource.Id.btnDecrement).Click += (o, e) =>
            txtNumber.Text = (--number).ToString();
        }
    }
}