一，HelloWorld

这个阶段主要完成目标：Xamarin价格收费标准考察和分析。Xamarin.Android 部署安装。第一个Xamarin.Android工程HelloWorld，熟悉Android工程新建、运行、打包整个流程。第二个Xamarin.Android工程，一个手机拨号应用；完成对Xamarin.android 开发的基本了解。

阶段结论：Xamarin.android 支持Android基本开发。

注意事项：Xamarin.android 所打包比原生系统所打包大3.02M

1.1 新建一个solution

1.2 运行工程

1.3 导出应用程序

1.3.1 选择工程

选中HelloWorld工程，在Tabbar栏，project–>Publish Android Application

1.3.2 填写签名证书

1.3.3 选择存放位置以及文件名，点击Create生成一个安装包

1.4 代码结构介绍

1.5 Xamarin Studio 介绍

二，手机拨号应用

2.1 整体界面效果

2.2 应用实现以及涉及知识点：

2.2.1 axml 界面布局使用

与Android 在eclipse中开发类似：允许使用界面布局选择器Toolbox将布局控件拖拽到页面上。也允许在Source中进行代码实现。

2.2.2 组件获取

Button mBtnCall = FindViewById<Button> (Resource.Id.CallButton);

2.2.3 添加事件

 mBtnCall.Click += (object sender, EventArgs e) =>{};

2.2.4 对话框

var callDialog = new AlertDialog.Builder(this);callDialog.SetMessage("Call " + translatedNumber + "?");callDialog.SetNeutralButton("Call", delegate {  // do other thing});callDialog.SetNegativeButton("Cancel", delegate { });// Show the alert dialog to the user and wait for response.callDialog.Show();

2.2.5 页面跳转

var intent = new Intent(this, typeof(CallHistoryActivity));intent.PutStringArrayListExtra("phone_numbers", phoneNumbers);StartActivity(intent);

2.2.6 打印输出

Console.WriteLine ("Test Output Str");

2.2.7 新建类

右键工程，选择Add 可以新建以下类文件

三，附上主要代码类：

using System.Text;using System;namespace PhoneCallDemo{public static class PhonewordTranslator{public static string ToNumber(string raw){if (string.IsNullOrWhiteSpace(raw))return "";elseraw = raw.ToUpperInvariant();var newNumber = new StringBuilder();foreach (var c in raw){if (" -0123456789".Contains(c))newNumber.Append(c);else {var result = TranslateToNumber(c);if (result != null)newNumber.Append(result);}// otherwise we've skipped a non-numeric char}return newNumber.ToString();}static bool Contains (this string keyString, char c){return keyString.IndexOf(c) >= 0;}static int? TranslateToNumber(char c){if ("ABC".Contains(c))return 2;else if ("DEF".Contains(c))return 3;else if ("GHI".Contains(c))return 4;else if ("JKL".Contains(c))return 5;else if ("MNO".Contains(c))return 6;else if ("PQRS".Contains(c))return 7;else if ("TUV".Contains(c))return 8;else if ("WXYZ".Contains(c))return 9;return null;}}}

using System;using Android.App;using Android.Content;using Android.Runtime;using Android.Views;using Android.Widget;using Android.OS;using System.Collections.Generic;namespace PhoneCallDemo{[Activity (Label = "PhoneCall", MainLauncher = true, Icon = "@drawable/icon")]public class MainActivity : Activity{static readonly List<string> phoneNumbers = new List<string>();protected override void OnCreate (Bundle bundle){base.OnCreate (bundle);// Set our view from the "main" layout resourceSetContentView (Resource.Layout.Main);// Get our button from the layout resource,// and attach an event to itEditText mEditPhoneNum = FindViewById<EditText> (Resource.Id.PhoneNumberText);Button mBtnCall = FindViewById<Button> (Resource.Id.CallButton);Button mBtnTrans = FindViewById<Button> (Resource.Id.TranslateButton);Button mBtnCallHistory = FindViewById<Button> (Resource.Id.callhistoryButton);mBtnCall.Enabled = false;mBtnCallHistory.Enabled = false;string translatedNumber = string.Empty;mBtnTrans.Click += (object sender, EventArgs e) => {translatedNumber = PhoneCallDemo.PhonewordTranslator.ToNumber(mEditPhoneNum.Text);if (String.IsNullOrWhiteSpace(translatedNumber)){mBtnCall.Text="Call";mBtnCall.Enabled = false;}else{mBtnCall.Text = "Call " + translatedNumber;mBtnCall.Enabled = true;}};mBtnCall.Click += (object sender, EventArgs e) => {var callDialog = new AlertDialog.Builder(this);callDialog.SetMessage("Call " + translatedNumber + "?");callDialog.SetNeutralButton("Call", delegate {phoneNumbers.Add(translatedNumber);mBtnCallHistory.Enabled = true;// Create intent to dial phonevar callIntent = new Intent(Intent.ActionCall);callIntent.SetData(Android.Net.Uri.Parse("tel:" + translatedNumber));StartActivity(callIntent);});callDialog.SetNegativeButton("Cancel", delegate { });// Show the alert dialog to the user and wait for response.callDialog.Show();};mBtnCallHistory.Click += (sender, e) =>{var intent = new Intent(this, typeof(CallHistoryActivity));intent.PutStringArrayListExtra("phone_numbers", phoneNumbers);StartActivity(intent);};}}}

using System;using System.Collections.Generic;using System.Linq;using System.Text;using Android.App;using Android.Content;using Android.OS;using Android.Runtime;using Android.Views;using Android.Widget;namespace PhoneCallDemo{[Activity (Label = "CallHistoryActivity")]public class CallHistoryActivity : ListActivity{protected override void OnCreate (Bundle bundle){base.OnCreate (bundle);// Create your application herevar phoneNumbers = Intent.Extras.GetStringArrayList("phone_numbers") ?? new string[0];this.ListAdapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleListItem1, phoneNumbers);}}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent">    <EditText        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/PhoneNumberText"        android:hint="TEL:123456" />    <Button        android:id="@+id/TranslateButton"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="@string/text_translate" />    <Button        android:text="Call"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/CallButton" />    <Button        android:text="@string/CallHistory"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/callhistoryButton" /></LinearLayout>

下一个阶段：Xamarin.IOS 部署开发

Xamarin.Android(安卓)入门开发