Sure, here's an example application in Java that allows the user to send and receive SMS messages:

MainActivity.java




typescript
import android.Manifest;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.telephony.SmsMessage;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

public class MainActivity extends AppCompatActivity {

    private static final int PERMISSION_SEND_SMS = 123;
    private static final int PERMISSION_RECEIVE_SMS = 456;

    private BroadcastReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Check for send SMS permission
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.SEND_SMS) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.SEND_SMS }, PERMISSION_SEND_SMS);
        }

        // Check for receive SMS permission
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECEIVE_SMS) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[] { Manifest.permission.RECEIVE_SMS }, PERMISSION_RECEIVE_SMS);
        }

        // Register SMS receiver
        receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                Bundle extras = intent.getExtras();
                if (extras != null) {
                    Object[] pdus = (Object[]) extras.get("pdus");
                    for (Object pdu : pdus) {
                        SmsMessage message = SmsMessage.createFromPdu((byte[]) pdu);
                        String sender = message.getOriginatingAddress();
                        String body = message.getMessageBody();
                        Toast.makeText(context, "Received SMS from " + sender + ": " + body, Toast.LENGTH_SHORT).show();
                    }
                }
            }
        };
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.provider.Telephony.SMS_RECEIVED");
        registerReceiver(receiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);
    }

    private void sendSMS(String phoneNumber, String message) {
        SmsManager smsManager = SmsManager.getDefault();
        smsManager.sendTextMessage(phoneNumber, null, message, null, null);
        Toast.makeText(this, "SMS sent to " + phoneNumber, Toast.LENGTH_SHORT).show();
    }
}

AndroidManifest.xml








php
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.smsdemo">

    <uses-permission android:name="android.permission.SEND_SMS" />
    <uses-permission android:name="android.permission.RECEIVE_SMS" />

    <application
        ...
    </application>

</manifest>

Note that you should replace com.example.smsdemo with your own package name in the manifest file. Also, make sure to request the appropriate permissions from the user at runtime.