Step 1: Open Visual Studio, New Project, Templates, Visual C#, Android, then Blank App (Android).

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.

XML Code:

  1. <?xml version="1.0" encoding="utf-8"?>
  3. <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">
  5. <RelativeLayout android:orientation="horizontal" android:layout_width="match_parent" android:id="@+id/linearLayout3" android:layout_height="wrap_content">
  7. <TextView android:text="TO" android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/textView1" android:gravity="top" android:paddingTop="20dp" />
  9. <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" />
  11. <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" />
  13. </RelativeLayout>
  15. <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">
  17. <EditText android:inputType="textMultiLine" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/txtbodymsg" />
  19. </LinearLayout>
  21. <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">
  23. <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">
  25. <TableRow android:minWidth="25px" android:minHeight="25px" android:layout_width="wrap_content" android:layout_height="match_parent" android:id="@+id/tableRow1">
  27. <Button android:text="Send" android:layout_width="wrap_content" android:layout_height="46.0dp" android:id="@+id/btnsmssend" android:layout_column="2" />
  29. </TableRow>
  31. </TableLayout>
  33. </LinearLayout>
  35. </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:

  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. using System.Linq;
  9. namespace SMS
  10. {
  11. [Activity(Label = "SMS", MainLauncher = true, Icon = "@drawable/icon")]
  12. public class MainActivity: Activity
  13. {
  14. Button btncontact;
  15. Button btnsmssend;
  16. EditText txtmobilenum;
  17. EditText txtbodymsg;
  18. protected override void OnCreate(Bundle bundle)
  19. {
  20. base.OnCreate(bundle);
  21. // Set our view from the "main" layout resource
  22. SetContentView(Resource.Layout.Main);
  23. txtbodymsg = FindViewById < EditText > (Resource.Id.txtbodymsg);
  24. txtmobilenum = FindViewById < EditText > (Resource.Id.txtmobilenum);
  25. btncontact = FindViewById < Button > (Resource.Id.btncontact);
  26. btnsmssend = FindViewById < Button > (Resource.Id.btnsmssend);
  27. btncontact.Click += Btncontact_Click;
  28. btnsmssend.Click += Btnsmssend_Click;
  29. }
  30. }
  31. }

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().

C# Code:

  1. private void Btncontact_Click(object sender, EventArgs e)
  2. {
  3. var contactPickerIntent = new Intent(Intent.ActionPick,
  4. Android.Provider.ContactsContract.Contacts.ContentUri);
  5. StartActivityForResult(contactPickerIntent, 101);
  6. }
  7. protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
  8. {
  9. if (requestCode == 101 && resultCode == Result.Ok)
  10. {
  11. //Ensure we have data returned
  12. if (data == null || data.Data == null)
  13. return;
  14. var addressBook = new Xamarin.Contacts.AddressBook(this);
  15. addressBook.PreferContactAggregation = false;
  16. //Load the contact via the android contact id
  17. // in the last segment of the Uri returned by the
  18. // android contact picker
  19. var contact = addressBook.Load(data.Data.LastPathSegment);
  20. //Use linq to find a mobile number
  21. var mobile = (from p in contact.Phones
  22. where
  23. p.Type == Xamarin.Contacts.PhoneType.Mobile
  24. select p.Number).FirstOrDefault();
  25. //See if the contact has a mobile number
  26. if (string.IsNullOrEmpty(mobile))
  27. {
  28. Toast.MakeText(this, "No Mobile Number for contact!",
  29. ToastLength.Short).Show();
  30. return;
  31. }
  32. txtmobilenum.Text = mobile;
  33. }
  34. }

Step 8: Finally w Send the sms on given selected Number so here to create Send Button Event.

C# code:

  1. private void Btnsmssend_Click(object sender, EventArgs e)
  2. {
  3. try
  4. {
  5. if (string.IsNullOrWhiteSpace(txtbodymsg.Text))
  6. {
  7. Toast.MakeText(this, "SMS Text Body Is Empty", ToastLength.Long).Show();
  8. }
  9. else if (string.IsNullOrWhiteSpace(txtmobilenum.Text))
  10. {
  11. Toast.MakeText(this, "Enter Mobile Number", ToastLength.Long).Show();
  12. }
  13. else
  14. {
  15. Toast.MakeText(this, "Sending SMS... Please wait...", ToastLength.Short).Show();
  16. //Send SMS!
  17. var smsMgr = Android.Telephony.SmsManager.Default;
  18. smsMgr.SendTextMessage(txtmobilenum.Text, null, txtbodymsg.Text, null, null);
  19. Toast.MakeText(this, "SMS successfully sent", ToastLength.Short).Show();
  20. txtbodymsg.Text = "";
  21. txtmobilenum.Text = "";
  22. }
  23. }
  24. catch (Exception ex)
  25. {
  26. Toast.MakeText(this, ex.ToString(), ToastLength.Short).Show();
  27. }
  28. }

Step 9: Press F5 or Build and Run the Application.