Make a Simple Android App – Xamarin Android Tutorial

Main.axml

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<?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

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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();         }     } }