Android program to send sms from the default sms application without opening the application with kotlin

1. Presented by :
Rushika Shah
Chandni Chauhan

2. 1.Create
New
Application
2.Add
Permission
4.Moidify
activity_main
.xml
3.Modify
MainActivity.kt 5.Run the
App

3. 2. Give App Permission To Use SEND SMS in
app -> manifests-> Android Manifest.xml
File New Project
Empty
Activity
Project
Configuration
Finish
1. Create new Kotlin Application in Android Studio
<uses-permission android:name="android.permission.SEND_SMS“ />

4. 3. Modify MainActivity.kt file
app -> java ->com.example.{project_name} ->MainActivity.kt
import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.telephony.SmsManager
import android.text.TextUtils
import android.view.View
import android.widget.Button
import android.widget.EditText
import android.widget.TextView
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import androidx.core.content.ContextCompat
Import all
classes

5. class MainActivity : AppCompatActivity() {
lateinit var editTextNumber : EditText
lateinit var editTextMessage : EditText
lateinit var button :Button
private val permissionRequest = 101
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
editTextNumber = findViewById(R.id.editTextNum)
editTextMessage = findViewById(R.id.editTextMsg)
button = findViewById(R.id.btnSendMsg)
title = "Send SMS"
}
Access widgets for
perform Task

6. • Check whether permission is already granted or not. If permission isn’t
already granted, request user for the permission.
ContextCompat.checkSelfPermission(thisActivity,Manifest.permission.
Permission_Name)

7. • When PERMISSION_DENIED is returned from the checkSelfPermission()
method in the above syntax, we need to prompt the user for that
permission. Android provides several methods that can be used to
request permission, such as requestPermissions().
ActivityCompat.requestPermissions(this,arrayOf(Manifest.permission.Perm
ission_Name), permissionRequest)

8. fun sendMessage(view: View) {
val permissionCheck = ContextCompat.checkSelfPermission(this,
Manifest.permission.SEND_SMS)
if (permissionCheck == PackageManager.PERMISSION_GRANTED) {
myMessage()
}
else {
ActivityCompat.requestPermissions(this,
arrayOf(Manifest.permission.SEND_SMS), permissionRequest)
}
}
Check User
Permission

9. • SMSManager class manages operations like sending a text message,
data message, and multimedia messages (MMS). For sending a text
message method sendTextMessage() is used likewise for multimedia
message sendMultimediaMessage() and for data
message sendDataMessage() method is used.
• we want to send Text message so we will use sendTextMessage() here.
SmsManager.sendTextMessage(String destinationAddress, String scAddress,
String text, PendingIntent sentIntent,PendingIntent deliveryIntent)

10. private fun myMessage() {
val myNumber: String = editTextNumber.text.toString().trim()
val myMsg: String = editTextMessage.text.toString().trim()
if (myNumber == "" || myMsg == "") {
Toast.makeText(this, "Field cannot be empty",
Toast.LENGTH_SHORT).show()
}
else {
if (TextUtils.isDigitsOnly(myNumber)) {
val smsManager: SmsManager = SmsManager.getDefault()
smsManager.sendTextMessage(myNumber, null, myMsg, null, null)
Toast.makeText(this, "Message Sent", Toast.LENGTH_SHORT).show()
}
else {
Toast.makeText(this, "Please enter the correct number",
Toast.LENGTH_SHORT).show()
}
}
}
}
SmsManager.sendText
Message() for sending
Message

11. 4. Modify activity_main.xml file
app -> res -> layout -> activity_main.xml
<EditText
android:id="@+id/editTextNum"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter mobile number"
android:textColor="@android:color/black" />
<EditText
android:id="@+id/editTextMsg"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Enter your message"
android:textColor="@android:color/black" />
Add EdiText For
Mobile Number
Add EdiText For
Text Message

12. <Button
android:id="@+id/btnSendMsg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginTop="5dp"
android:onClick="sendMessage"
android:text="Send Message" />
Add Button For
Send SMS

13. 5. Run the Application
Click on Run Application or Press Alt+Shift+F10
Here we are running Application on the android Device, so we will
find the Application with Android icon on your Device as shown
below.