摘要：
Xamarin。Android转换、调用和查看电子文本文章的历史记录。˃2671314neneneba 2021年2728“33/˃3436主要活动代码。1usingSystem；2usingSystem.Collections.Generic；3usingSystem.Linq；4usingSystem.Text；56usingAndroid.App；7usingAndrio.Content；8usingAndrOS.OS；9usingAndrool.Runtime；10usingAndrro.Views；11usingAndrox.Widget；1213namespaceApp314｛15[activity]16 publicclassCallActivity:Activity17｛18//定义电话集合。19 privatestaticreationonnlyList＜string＞PhoneNumbers=newList＜string˃（）；20 protectedoverridevoidOnCreate21｛22base.OnCreate；23SetContentView；24EditTextet=FindViewById；25ButtonbtnTran=FindViewById；26ButtonbtnCall=FindViewById｛35translatedNumber=PhoneTranslator.ToNumber；36//将转换后的电话号码添加到电话集合中。37PhoneNumbers.Add；38btnCallHistory.Enabled=true；39if40｛41btnCall.Text=“Call”；42btnCall.Enabled=false；43｝44else45｛46btnCall.Dext=“Call”+translatedNumber；47btnCall.Inabled=true；48｝49｝；505152btn呼叫。单击+==˃53｛54//Dialog 55 varcallDialog=newAlertDialog.Builder；56callDialog.SetMessage（“Call”+translatedNumber+“？
Xamarin.Android之转换，呼叫，查看历史纪录
功能：能将输入的字母转换成相应的数字。并且能呼叫出去。能查看呼叫的历史纪录。
界面代码如下：
1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3 android:orientation="vertical" 4 android:layout_width="fill_parent" 5 android:layout_height="fill_parent"> 6 7 <EditText 8 android:layout_width="fill_parent" 9 android:layout_height="wrap_content" 10 android:text="0712-XAMARIN" 11 android:id="@+id/et" 12 /> 13 14 <Button 15 android:layout_width="fill_parent" 16 android:layout_height="wrap_content" 17 android:text="转换" 18 android:id="@+id/btnTran" 19 /> 20 21 <Button 22 android:layout_width="fill_parent" 23 android:layout_height="wrap_content" 24 android:text="呼叫" 25 android:id="@+id/btnCall" 26 /> 27 28 <Button 29 android:layout_width="fill_parent" 30 android:layout_height="wrap_content" 31 android:text="历史纪录" 32 android:id="@+id/btnCallHistory" 33 /> 34 36 </LinearLayout>
主Activity代码。
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 using Android.App; 7 using Android.Content; 8 using Android.OS; 9 using Android.Runtime; 10 using Android.Views; 11 using Android.Widget; 12 13 namespace App3 14 { 15 [Activity(Label = "CallActivity", MainLauncher = true, Icon = "@drawable/icon2")] 16 public class CallActivity : Activity 17 { 18 //定义手机集合。 19 private static readonly List<string> PhoneNumbers = new List<string>(); 20 protected override void OnCreate(Bundle bundle) 21 { 22 base.OnCreate(bundle); 23 SetContentView(Resource.Layout.Call); 24 EditText et = FindViewById<EditText>(Resource.Id.et); 25 Button btnTran = FindViewById<Button>(Resource.Id.btnTran); 26 Button btnCall = FindViewById<Button>(Resource.Id.btnCall); 27 btnCall.Enabled = false; 28 Button btnCallHistory = FindViewById<Button>(Resource.Id.btnCallHistory); 29 btnCallHistory.Enabled = false; 30 string translatedNumber = string.Empty; 31 32 33 btnTran.Click += (sender, e) => 34 { 35 translatedNumber = PhoneTranslator.ToNumber(et.Text); 36 //将转换的手机号加入到手机集合中。 37 PhoneNumbers.Add(translatedNumber); 38 btnCallHistory.Enabled = true; 39 if (String.IsNullOrWhiteSpace(translatedNumber)) 40 { 41 btnCall.Text = "呼叫"; 42 btnCall.Enabled = false; 43 } 44 else 45 { 46 btnCall.Text = "呼叫" + translatedNumber; 47 btnCall.Enabled = true; 48 } 49 }; 50 51 52 btnCall.Click += (sender, e) => 53 { 54 //对话框 55 var callDialog = new AlertDialog.Builder(this); 56 callDialog.SetMessage("呼叫" + translatedNumber + "?"); 57 //拨打按钮 58 callDialog.SetNeutralButton("呼叫", delegate 59 { 60 //使用意图拨打电话 61 var callIntent = new Intent(Intent.ActionCall); 62 //将需要拨打的电话设置为意图的参数.注意写法 63 callIntent.SetData(Android.Net.Uri.Parse("tel:" + translatedNumber)); 64 StartActivity(callIntent); 65 }); 66 callDialog.SetNegativeButton("取消", delegate { }); 67 callDialog.Show(); 68 }; 69 70 71 btnCallHistory.Click += (sender, e) => 72 { 73 //用意图打开历史纪录的活动 74 Android.Content.Intent it = new Intent(this, typeof(CallHistoryActiviry)); 75 it.PutStringArrayListExtra("phoneNumbers", PhoneNumbers); 76 StartActivity(it); 77 }; 78 79 } 80 } 81 }
通话纪录的Activity代码。
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 using Android.App; 7 using Android.Content; 8 using Android.OS; 9 using Android.Runtime; 10 using Android.Views; 11 using Android.Widget; 12 13 namespace App3 14 { 15 [Activity(Label = "CallHistoryActiviry")] 16 public class CallHistoryActiviry : ListActivity 17 { 18 protected override void OnCreate(Bundle bundle) 19 { 20 base.OnCreate(bundle); 21 var phoneNumbers = Intent.Extras.GetStringArrayList("phoneNumbers") ?? new string[0]; 22 //只有当此Activity继承于ListActivity时，整个视图才是列表，才可以这么写。 23 this.ListAdapter = new ArrayAdapter<string>(this, Android.Resource.Layout.SimpleExpandableListItem1, phoneNumbers); 24 } 25 } 26 }