（一）原本java的寫法（相信很多是學過java的）：

需要實現接口View.IOnClickListener，最好也繼承類：Activity，因為View.IOnClickListener接口又繼承了IJavaObject, IDisposable接口，所以還學要實現這兩個接口里面的成員，而Activity已經實現可了這兩個接口的成員，就不需要我們再寫了，畢竟我們大部分只想重寫View.IOnClickListener里面的OnClick函數。（如果自定義的類只是實現了View.IOnClickListener接口，不繼承Activity，就需要實現另外2個接口的其他成員，在vs中選中接口，使用快捷鍵Alt+Shift+F10，可快速實現接口）

代碼如下：

1 using System; 2 using Android.App; 3 using Android.Content; 4 using Android.Runtime; 5 using Android.Views; 6 using Android.Widget; 7 using Android.OS; 8 9 namespace App2 10 { 11 [Activity(Label = "App2", MainLauncher = true, Icon = "@drawable/icon")] 12 13 14 public class MainActivity : Activity, View.IOnClickListener 15 { 16 Button button; 17 public void OnClick(View v) 18 { 19 button.Text = string.Format("{0} clicks!", v.Id); 20 } 21 protected override void OnCreate(Bundle bundle) 22 { 23 base.OnCreate(bundle); 24 25 // Set our view from the "main" layout resource 26 SetContentView(Resource.Layout.Main); 27 28 // Get our button from the layout resource, 29 // and attach an event to it 30 button = FindViewById<Button>(Resource.Id.MyButton); 31 button.SetOnClickListener(this); 32 33 } 34 } 35 }

當然也可以自己定義一個類，實現接口，重寫OnClick函數，然后button.SetOnClickListener(你自定義類的實例);

（二）接下來介紹C#的4種寫法（其實大同小異）

1.第一種（創建模板就有的）：

1 Button button = FindViewById<Button>(Resource.Id.MyButton); 2 button.Click += delegate { button.Text = string.Format ("{0} clicks!", count++);};

2.第二種

1 namespace App2 2 { 3 [Activity(Label = "App2", MainLauncher = true, Icon = "@drawable/icon")] 4 5 6 public class MainActivity : Activity, View.IOnClickListener 7 { 8 int count = 1; 9 Button button; 10 11 protected override void OnCreate(Bundle bundle) 12 { 13 base.OnCreate(bundle); 14 15 // Set our view from the "main" layout resource 16 SetContentView(Resource.Layout.Main); 17 18 // Get our button from the layout resource, 19 // and attach an event to it 20 button = FindViewById<Button>(Resource.Id.MyButton); 21 button.Click +=button_Click; 22 23 } 24 25 private void button_Click(object sender, EventArgs e) 26 { 27 button.Text = string.Format("{0} clicks!", count++); 28 } 29 30 31 } 32 }

3.第三種

1 public class MainActivity : Activity, View.IOnClickListener 2 { 3 int count = 1; 4 Button button; 5 6 protected override void OnCreate(Bundle bundle) 7 { 8 base.OnCreate(bundle); 9 10 // Set our view from the "main" layout resource 11 SetContentView(Resource.Layout.Main); 12 13 // Get our button from the layout resource, 14 // and attach an event to it 15 button = FindViewById<Button>(Resource.Id.MyButton); 16 button.Click += new EventHandler(button_Click); 17 18 } 19 20 private void button_Click(object sender, EventArgs e) 21 { 22 button.Text = string.Format("{0} clicks!", count++); 23 } 24 25 26 } View Code

4.第四種

1 namespace App2 2 { 3 [Activity(Label = "App2", MainLauncher = true, Icon = "@drawable/icon")] 4 5 6 public class MainActivity : Activity, View.IOnClickListener 7 { 8 int count = 1; 9 Button button; 10 11 protected override void OnCreate(Bundle bundle) 12 { 13 base.OnCreate(bundle); 14 15 // Set our view from the "main" layout resource 16 SetContentView(Resource.Layout.Main); 17 18 // Get our button from the layout resource, 19 // and attach an event to it 20 button = FindViewById<Button>(Resource.Id.MyButton); 21 button.Click += (sender, e) =>{ button.Text = string.Format ("{0} clicks!", count++);}; 22 23 } 24 } 25 } View Code

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轉載于:https://www.cnblogs.com/nightswatch/p/4276840.html

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