Let’s start,

Step 1: Open Visual Studio->New Project->Templates->Visual C#->Android, then Select Blank App. Then give Project Name and Project Location.

Step 2: Next go to Solution Explorer-> Project Name-> Components then Right Click to Get More Components then open new Dialog box. This dialog box to search the Xamarin.Mobile then Click Add App.

Step 3: Next to Open Solution Explorer->Project Name->Properties->AndroidManifest.xml Open the Xml page then give permission for READ_CONTACTS and SEND_SMS.

Step 4: Next to Open Solution Explorer->Project Name->Resources->layout, then Main.axml Click Open Design View and give the following code.

AXML Code:-

 <?xml version="1.0" encoding="utf-8"?>  
 <RelativeLayout 
 xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:id="@+id/lellayout"
 android:background="#3E4095">  
 <RelativeLayout
 android:orientation="horizontal"
 android:layout_width="match_parent"
 android:id="@+id/linearLayout3"
 android:layout_height="wrap_content">  
 <TextView
 android:text="TO"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:id="@+id/textView1"
 android:gravity="top"
 android:paddingTop="20dp" />  
 <EditText
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_alignParentRight="true"
 android:id="@+id/txtmobilenum"
 android:layout_marginLeft="20dp"
 android:layout_marginRight="35dp" /> 
 <Button
 android:background="@drawable/addusergroup_48"
 android:layout_width="42.7dp"
 android:layout_alignParentRight="true"
 android:layout_height="wrap_content"
 android:id="@+id/btncontact"
 android:layout_marginLeft="20dp"
 android:layout_marginRight="2dp" /> 
 </RelativeLayout>  
 <LinearLayout 
android:orientation="vertical"
android:minWidth="25px"
 android:minHeight="25px"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_below="@id/linearLayout3"
 android:id="@+id/linearLayout6">  
 <EditText
 android:inputType="textMultiLine"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:id="@+id/txtbodymsg" />  
 </LinearLayout>  
 <LinearLayout
 android:orientation="vertical"
 android:minWidth="25px"
 android:minHeight="25px"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_below="@id/linearLayout6"
 android:id="@+id/linearLayout7">  
 <TableLayout
 android:orientation="horizontal"
 android:layout_width="match_parent"
 android:layout_below="@id/linearLayout3"
 android:stretchColumns="*"
 android:layout_height="wrap_content"
 android:id="@+id/linearLayout5">  
 <TableRow
 android:minWidth="25px" 
 android:minHeight="25px"
 android:layout_width="wrap_content"
 android:layout_height="match_parent"
 android:id="@+id/tableRow1">  
 <Button
 android:text="Send"
 android:layout_width="wrap_content"
 android:layout_height="46.0dp"
 android:id="@+id/btnsmssend"
 android:layout_column="2" />  
 </TableRow>  
 </TableLayout>  
 </LinearLayout>  
 </RelativeLayout>

Step 5: Next to Open Solution Explorer-> Project Name->MainActivity.cs.open c# Code Window. First give name space for using System.Linq;

Step 6: Next to declare Button and EditText Events and following to create Button Click Events.

C# Code:-

 using System; 
 using Android.App; 
 using Android.Content; 
 using Android.Runtime; 
 using Android.Views; 
 using Android.Widget; 
 using Android.OS; 
 using System.Linq; 
 namespace SMS 
 { 
 [Activity(Label = "SMS", MainLauncher = true, Icon = "@drawable/icon")] 
 public class MainActivity: Activity 
 { 
 Button btncontact; 
 Button btnsmssend; 
 EditText txtmobilenum; 
 EditText txtbodymsg; 
 protected override void OnCreate(Bundle bundle) 
 { 
 base.OnCreate(bundle); 
 // Set our view from the "main" layout resource 
 SetContentView(Resource.Layout.Main); 
 txtbodymsg = FindViewById < EditText > (Resource.Id.txtbodymsg); 
 txtmobilenum = FindViewById < EditText > (Resource.Id.txtmobilenum); 
 btncontact = FindViewById < Button > (Resource.Id.btncontact); 
 btnsmssend = FindViewById < Button > (Resource.Id.btnsmssend); 
 btncontact.Click += Btncontact_Click; 
 btnsmssend.Click += Btnsmssend_Click; 
 } 
 } 
 }

Step 7: Next to Pick the Contact Number in Contact List.so here create Contact Picker Button Click Event and then its passing Intent Value in OnActivityResult().

 
 private void Btncontact_Click(object sender, EventArgs e) 
 { 
 var contactPickerIntent = new Intent(Intent.ActionPick, 
 Android.Provider.ContactsContract.Contacts.ContentUri); 
 StartActivityForResult(contactPickerIntent, 101); 
 } 
 protected override void OnActivityResult(int requestCode, Result resultCode, Intent data) 
 { 
 if (requestCode == 101 && resultCode == Result.Ok) 
 { 
 //Ensure we have data returned 
 if (data == null || data.Data == null) 
 return; 
 var addressBook = new Xamarin.Contacts.AddressBook(this); 
 addressBook.PreferContactAggregation = false; 
 //Load the contact via the android contact id 
 // in the last segment of the Uri returned by the 
 // android contact picker 
 var contact = addressBook.Load(data.Data.LastPathSegment); 
 //Use linq to find a mobile number 
 var mobile = (from p in contact.Phones 
 where 
 p.Type == Xamarin.Contacts.PhoneType.Mobile 
 select p.Number).FirstOrDefault(); 
 //See if the contact has a mobile number 
 if (string.IsNullOrEmpty(mobile)) 
 { 
 Toast.MakeText(this, "No Mobile Number for contact!", 
 ToastLength.Short).Show(); 
 return; 
 } 
 txtmobilenum.Text = mobile; 
 } 
 } 

Anbu Mani

Anbu Mani(Microsoft MVP) is working Software Engineer in Changepond Technologies, Chennai, Tamilnadu, India. Having 4+ years of experience and his area of interest is C#, ASP.NET, SQL Server, Xamarin and Xamarin Forms,Azure…etc

anbumani.dev/