Practical NO.
29 : Develop a program to (a) Send SMS (b) Receive
SMS.
• activity_main.xml
<RelativeLayout android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/ android:layout_height="wrap_content"
apk/res/android" android:hint="Enter message"
android:inputType="text"
xmlns:tools="http://schemas.android.com/to android:padding="12dp"
ols"
android:layout_width="match_parent" android:layout_below="@id/editTextPhone"
android:layout_height="match_parent" android:layout_marginTop="10dp" />
tools:context=".MainActivity">
<Button
<EditText android:id="@+id/buttonSend"
android:id="@+id/editTextPhone" android:layout_width="wrap_content"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_height="wrap_content" android:text="Send SMS"
android:hint="Enter phone number"
android:inputType="phone" android:layout_below="@id/editTextMessag
android:padding="12dp" e"
android:layout_marginTop="50dp" /> android:layout_marginTop="20dp"
android:layout_centerHorizontal="true" />
<EditText </RelativeLayout>
android:id="@+id/editTextMessage"
• MainActivity.java
package com.example.twentynine;
private EditText editTextPhone,
import android.Manifest; editTextMessage;
import android.content.IntentFilter; private Button buttonSend;
import android.content.pm.PackageManager;
import android.os.Bundle; @Override
import android.telephony.SmsManager; protected void onCreate(Bundle
import android.view.View; savedInstanceState) {
import android.widget.Button; super.onCreate(savedInstanceState);
import android.widget.EditText; setContentView(R.layout.activity_main);
import android.widget.Toast;
editTextPhone =
import androidx.annotation.NonNull; findViewById(R.id.editTextPhone);
import editTextMessage =
androidx.appcompat.app.AppCompatActivity; findViewById(R.id.editTextMessage);
import androidx.core.app.ActivityCompat; buttonSend =
import androidx.core.content.ContextCompat; findViewById(R.id.buttonSend);
public class MainActivity extends // Request SMS permissions
AppCompatActivity { requestSMSPermission();
private static final int // Register SMS receiver dynamically
PERMISSION_REQUEST_CODE = 1; SMSReceiver smsReceiver = new
SMSReceiver(); onRequestPermissionsResult(int requestCode,
IntentFilter filter = new @NonNull String[] permissions, @NonNull
IntentFilter("android.provider.Telephony.SM int[] grantResults) {
S_RECEIVED");
registerReceiver(smsReceiver, filter); super.onRequestPermissionsResult(requestCo
de, permissions, grantResults);
// Send SMS on button click if (requestCode ==
buttonSend.setOnClickListener(new PERMISSION_REQUEST_CODE) {
View.OnClickListener() { if (grantResults.length > 0 &&
@Override grantResults[0] ==
public void onClick(View v) { PackageManager.PERMISSION_GRANTED)
String phoneNumber = {
editTextPhone.getText().toString().trim(); Toast.makeText(this, "Permissions
String message = granted!", Toast.LENGTH_SHORT).show();
editTextMessage.getText().toString().trim(); } else {
Toast.makeText(this, "Permissions
if (!phoneNumber.isEmpty() && denied. SMS features won't work.",
!message.isEmpty()) { Toast.LENGTH_SHORT).show();
sendSMS(phoneNumber, }
message); }
} else { }
Toast.makeText(MainActivity.this, "Please // Send SMS
enter phone number and message", private void sendSMS(String
Toast.LENGTH_SHORT).show(); phoneNumber, String message) {
} try {
} SmsManager smsManager =
}); SmsManager.getDefault();
}
smsManager.sendTextMessage(phoneNumber
// Request SMS permissions , null, message, null, null);
private void requestSMSPermission() { Toast.makeText(this, "SMS sent
if successfully!",
(ContextCompat.checkSelfPermission(this, Toast.LENGTH_SHORT).show();
Manifest.permission.SEND_SMS) != } catch (Exception e) {
PackageManager.PERMISSION_GRANTED || Toast.makeText(this, "SMS sending
failed: " + e.getMessage(),
ContextCompat.checkSelfPermission(this, Toast.LENGTH_LONG).show();
Manifest.permission.RECEIVE_SMS) != }
PackageManager.PERMISSION_GRANTED) }
{ }
String username =
ActivityCompat.requestPermissions(this, new usernameEditText.getText().toString().trim();
String[]{ String password =
Manifest.permission.SEND_SMS, passwordEditText.getText().toString().trim();
Manifest.permission.RECEIVE_SMS, // Check if username and password meet
Manifest.permission.READ_SMS the required conditions
}, PERMISSION_REQUEST_CODE); boolean isUsernameValid =
} username.length() >= 3; // Username must be
} at least 3 characters
boolean isPasswordValid =
// Handle permission results password.length() >= 6; // Password must be
@Override at least 6 characters
public void
isPasswordValid);
// Enable button only when both fields }
are valid }
loginButton.setEnabled(isUsernameValid &&
• SMSReceiver.java
package com.example.twentynine; SmsMessage.createFromPdu((byte[]) pdu);
String senderNumber =
import android.content.BroadcastReceiver; smsMessage.getDisplayOriginatingAddress();
import android.content.Context; String messageBody =
import android.content.Intent; smsMessage.getMessageBody();
import android.os.Bundle;
import android.telephony.SmsMessage; // Log the message for debugging
import android.widget.Toast; Log.d("SMSReceiver", "SMS
import android.util.Log; from: " + senderNumber + " Message: " +
messageBody);
public class SMSReceiver extends
BroadcastReceiver { // Show a Toast notification
Toast.makeText(context, "SMS
@Override from: " + senderNumber + "\nMessage: " +
public void onReceive(Context context, messageBody,
Intent intent) { Toast.LENGTH_LONG).show();
Bundle bundle = intent.getExtras(); }
if (bundle != null) { }
Object[] pdus = (Object[]) }
bundle.get("pdus"); }
if (pdus != null) { }
for (Object pdu : pdus) {
SmsMessage smsMessage =
• AndroidManifest.xml
<manifest android:name="android.permission.RE
xmlns:android="http://schemas.android. AD_SMS" />
com/apk/res/android"
<application
package="com.example.twentynine"> android:allowBackup="true"
android:supportsRtl="true"
<!-- Permissions for sending and android:label="SMS App"
receiving SMS -->
<uses-permission android:theme="@style/Theme.AppCo
android:name="android.permission.SE mpat.Light.DarkActionBar">
ND_SMS" />
<uses-permission <!-- MainActivity with explicit
android:name="android.permission.RE android:exported -->
CEIVE_SMS" />
<activity
<uses-permission
android:name=".MainActivity" CEIVE_SMS" />
android:exported="true"> <uses-permission
<intent-filter> android:name="android.permission.RE
<action AD_SMS" />
android:name="android.intent.action.M
AIN" /> <application
<category android:allowBackup="true"
android:name="android.intent.category. android:supportsRtl="true"
LAUNCHER" /> android:label="SMS App"
</intent-filter>
</activity> android:theme="@style/Theme.AppCo
mpat.Light.DarkActionBar">
<!-- Register SMSReceiver with
explicit android:exported --> <!-- MainActivity with explicit
<receiver android:exported -->
android:name=".SMSReceiver" <activity
android:name=".MainActivity"
android:permission="android.permissio android:exported="true">
n.BROADCAST_SMS" <intent-filter>
android:exported="true"> <action
<intent-filter> android:name="android.intent.action.M
<action AIN" />
android:name="android.provider.Teleph <category
ony.SMS_RECEIVED" /> android:name="android.intent.category.
</intent-filter> LAUNCHER" />
</receiver> </intent-filter>
</activity>
</application>
<!-- Register SMSReceiver with
</manifest> <manifest explicit android:exported -->
xmlns:android="http://schemas.android. <receiver
com/apk/res/android" android:name=".SMSReceiver"
package="com.example.twentynine"> android:permission="android.permissio
n.BROADCAST_SMS"
<!-- Permissions for sending and android:exported="true">
receiving SMS --> <intent-filter>
<uses-permission <action
android:name="android.permission.SE android:name="android.provider.Teleph
ND_SMS" /> ony.SMS_RECEIVED" />
<uses-permission </intent-filter>
android:name="android.permission.RE </receiver>
</application>
</manifest>
Output:
