Slip 9 - D) Create application to send SMS message to a friend. After sending message display delivery report of message.

Solution:

AndroidManifest.xml

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

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

MainActivity.java

import android.app.PendingIntent;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.telephony.SmsManager;

import android.telephony.SmsMessage;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private EditText phoneNumberEditText;

    private EditText messageEditText;

    private DeliveryReportReceiver deliveryReportReceiver;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // Get references to the UI elements

        phoneNumberEditText = findViewById(R.id.phone_number_edit_text);

        messageEditText = findViewById(R.id.message_edit_text);

        Button sendButton = findViewById(R.id.send_button);

        // Register the delivery report receiver

        deliveryReportReceiver = new DeliveryReportReceiver();

        registerReceiver(deliveryReportReceiver, new IntentFilter("DELIVERED_SMS"));

        // Set a click listener for the send button

        sendButton.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                // Get the phone number and message from the UI

                String phoneNumber = phoneNumberEditText.getText().toString();

                String message = messageEditText.getText().toString();

                // Create the SMS manager and send the message

                SmsManager smsManager = SmsManager.getDefault();

                Intent deliveryIntent = new Intent("DELIVERED_SMS");

                PendingIntent deliveryPendingIntent = PendingIntent.getBroadcast(MainActivity.this, 0, deliveryIntent, PendingIntent.FLAG_UPDATE_CURRENT);

                smsManager.sendTextMessage(phoneNumber, null, message, null, deliveryPendingIntent);

                // Display a toast message indicating that the message has been sent

                Toast.makeText(MainActivity.this, "Message sent", Toast.LENGTH_SHORT).show();

            }

        });

    }

    @Override

    protected void onDestroy() {

        super.onDestroy();

        // Unregister the delivery report receiver

        unregisterReceiver(deliveryReportReceiver);

    }

    private class DeliveryReportReceiver extends android.content.BroadcastReceiver {

        @Override

        public void onReceive(android.content.Context context, Intent intent) {

            switch (getResultCode()) {

                case RESULT_OK:

                    // Display a toast message indicating that the message has been delivered

                    Toast.makeText(context, "Message delivered", Toast.LENGTH_SHORT).show();

                    break;

                case RESULT_CANCELED:

                    // Display a toast message indicating that the message could not be delivered

                    Toast.makeText(context, "Message delivery failed", Toast.LENGTH_SHORT).show();

                    break;

            }

        }

    }

}