Practical 29.
1: Write a program to send and receive SMS, make use of following GUI:
Java File:
package com.example.practical29;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private EditText txtMobile;
private EditText txtMessage;
private Button btnSms;
private static final int REQUEST_SMS_PERMISSION = 1; // Permission request code
private static final String TAG = "SmsDebug"; // Tag for logging
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize UI components
txtMobile = findViewById(R.id.mblTxt);
txtMessage = findViewById(R.id.msgtxt);
btnSms = findViewById(R.id.btnSend);
// Check and request SMS permission
requestSmsPermission();
// Set button click listener
btnSms.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sendSms();
}
});
}
// Request SMS permission at runtime
private void requestSmsPermission() {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.SEND_SMS)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.SEND_SMS}, REQUEST_SMS_PERMISSION);
}
}
// Handle runtime permission result
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == REQUEST_SMS_PERMISSION) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "SMS Permission Granted", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(this, "SMS Permission Denied", Toast.LENGTH_SHORT).show();
}
}
}
// Send SMS
private void sendSms() {
String mobileNumber = txtMobile.getText().toString().trim();
String message = txtMessage.getText().toString().trim();
// Validate mobile number and message
if (mobileNumber.isEmpty()) {
Toast.makeText(this, "Please enter a mobile number", Toast.LENGTH_SHORT).show();
return;
}
if (!mobileNumber.matches("\\d{10,15}")) { // Regex for valid number
Toast.makeText(this, "Invalid mobile number format", Toast.LENGTH_SHORT).show();
return;
}
if (message.isEmpty()) {
Toast.makeText(this, "Please enter a message", Toast.LENGTH_SHORT).show();
return;
}
try {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(mobileNumber, null, message, null, null);
Toast.makeText(this, "SMS Sent Successfully!", Toast.LENGTH_SHORT).show();
Log.d(TAG, "SMS sent to: " + mobileNumber + " | Message: " + message);
} catch (Exception e) {
Toast.makeText(this, "SMS Failed to Send. Please try again.", Toast.LENGTH_SHORT).show();
Log.e(TAG, "SMS sending failed: ", e);
}
}
}
Activity file:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<!-- Mobile Number Label -->
<TextView
android:id="@+id/fstTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Mobile No"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp" />
<!-- Mobile Number Input -->
<EditText
android:id="@+id/mblTxt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="Enter mobile number"
android:inputType="phone"
app:layout_constraintTop_toBottomOf="@id/fstTxt"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_marginTop="8dp" />
<!-- Message Label -->
<TextView
android:id="@+id/secTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Message"
app:layout_constraintTop_toBottomOf="@id/mblTxt"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp" />
<!-- Message Input -->
<EditText
android:id="@+id/msgtxt"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="Enter your message"
android:inputType="textMultiLine"
android:minLines="4"
android:gravity="top"
app:layout_constraintTop_toBottomOf="@id/secTxt"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginStart="16dp"
android:layout_marginEnd="16dp"
android:layout_marginTop="8dp" />
<!-- Send Button -->
<Button
android:id="@+id/btnSend"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send"
app:layout_constraintTop_toBottomOf="@id/msgtxt"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginTop="16dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
Manifest File:
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.practical29">
<!-- Required permission for sending SMS -->
<uses-permission android:name="android.permission.SEND_SMS" />
<!-- Add any additional permissions if needed in the future -->
<!-- Example: <uses-permission android:name="android.permission.RECEIVE_SMS" /> -->
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.Practical29">
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Output:
